US2353860A - Typewriting machine - Google Patents

Description

July 18,1944. c. WALKER TYPEWRITIDNG MACHINE Fil ed Nbv. 26, 1942 6 Sheets-Sheet 1 InvEnTuR UHARLEs WALKER r I m! ATT ufirrar Jill 18, 1944.

c. WALKER v TYPvEWRiTIN G MACHINE File'd Nov. 26, 1942 I e Sheets-Sheet 2 IINE HT 012 3 UHAHL 5 WALKER 3 2. v

ATT URNEY 1944-1 WALKR ,353,860

' TYPEWRITING MACHINE I Filed Nov. 26, 1942 s Sheets-Shet 4 InvEnTnR ATTmmEY c. WALKER 2,353,860

TYPEWRITING MACHINE Filed Nov. 26, 1942 I6 Sheets-Sheet 5 mm; ATT mm EY m m. NA W .w v 5 m: 3 L. o a n A H @w fi/ B W 2 a 0 3 6 9E/5 3 56 3 a a 4 a .3/ a 4 5 f 6 4 8 9 w 7 .2 w w 0 July is, 1944.

July 18, 1944. c. WALKER TYPEWRITING MACHINE Filed Nov. 26; 1942 sisheets-sheet e IHVENTUR E'HAHL E5 HAL KER A'rrumgEY Patented July 18, 1944 TYPEWRITING MACHINE,

Charles Walker, Syracuse, N. Y., assignor to L. C. Smith & Corona Typewriters, Inc., Syracuse, N. Y., a corporation of New York Application November 26, 1942, Serial No.- 466,989 22 Claims. (01. 197-17) The invention relates to improvements in typewriting machines, the general object of the invention being to provide an improved, more efficient, and more easily operated typewriting machine of the kind in which type impressions and concomitant letter space feeding of the paper which receives the type impressions are effected under control of manually operable type keys by power independent of that exerted by the typist in depressing the type keys.

The invention relates particularly to improvements in the means whereby type impressionsand desired letter space feeding of the paper are effected.

The invention, more particularly, provides improved key-controlled power-actuated means for effecting selective actuation of the type carriers of the machine and concomitant letter space feeding of the paper which receives the type ciently accomplishing the several aforesaid ends with great ease and a minimum of effort by a typist.

The invention also provides an improved construction and arrangement of parts (including the keys, the space bar, and adjacent portions of the main frame of the machine) affording an improved keyboard portion or section of the machine whereby the several keys and the space bar are operable by the typist with maximum ease, efliciency and comfort, and whereby the keyboard and adjacent parts of the main frame are so constructed and arranged as also to enhance the appearance and compactness of the machine.

Other purposes and advantages of'the invention will appear from the following description in detail of the preferred embodiment of the invention illustrated in the accompanying drawings.

The invention, to the foregoing ends, comprises the arrangement of parts, features of constructions and combinations of elements and devices particularly pointed out in each of the several appended claims.

The drawings illustrate the invention in accordance with a preferred construction, hereinafter particularly described, wherein theimprovements are incorporated in a known L C Smith typewriting machine otherwise constructed substantially as is disclosed, for example, in United States patents to Gabrielson numbered 983,490, 1,018,968, 1,032,131, and 2,029,200, it being understood that said improvements may be embodied in other machines.

In the drawings;

Figure 1 is a fragmentary top plan View of the improved machine, certain parts being omitted and others broken away for clarity of illustration.

Figure 2 is a fragmentary vertical longitudinal sectional View taken substantially medially of the machine, certain parts'being broken away and others omitted.

- Figure 3- is a detail sectional view taken approximately on the line 33 of Figure 1 and showing features of .the keyboard.

Figure 4 is a detail sectional view taken on the line 4-4 of Figure 3. l

Figure 5 is a detail sectional View taken on'the' line 5-5 of Figure 3.

Figure 6 is a fragmentary front elevation of the keyboard portion of the machine.

Figure 7 is a detail sectional view taken on the line of Figure 3.

Figure 8 is a detail sectional view taken approximately on the line 8-8 of 'Fig'ure'9.

Figure 9 is a detail view, partly in section approximately on the line 9-9 of Figure 8, showing parts of the key-controlled power mechanism of the machine. I

Figure 10 is a detail sectional View taken on the line l0|0 of Figure 9.

Figure 11 is a detail sectional view taken ap- Figure 14 is a detail sectional View taken ap proximately on the line I4l4 of Figure, 1 and showing parts of the key-controlled power mechanism of the machine.

The illustrative embodiment of the invention 1 shown'in the drawings will now be described.

The machine illustrated has a suitable stationary main framework, portions of which are shown, said framework being generally designated by the reference numeral H3. The machine is provided with the usual roller platen H journaled in the usual platen carriage I2 which, in turn, is mounted on the framework as usual to travel transversely of the machinefor letter feeding or spacing under controlof the usual escapement device. This escapement device comprises the usual feed rack l fixed to the carriage,

the usual feed pinion 2 meshing with said rack,'

" 22 and being secured at their lower ends to a the usual shaft 3 journaled in the mainframe and to which is fixed'said pinion Land the usual escapement ratchet wheel 4. the usual escapement dog rocker 5 pivoted at 6 on the mainframe and carrying the usual pair of escapement dogs 1 and 8 coactive with wheel 4, theusual spring- 9 drum (not shown) mounted on frame Ill, and the usual draw band (not shown) connecting the drum to the carriage to normally urge the carriage from right to left or in letter spacing direction.

The type bars l3 of the usual arcuate system of type bars (only one medial and one end one of which type bars are shown) have their pivots [4 carried by the usual type bar segment carries a lower case type"; :and an'upper case type H, the" upwardly and rearwardly inclin'edf type bar segment being shiftable by suitable case shift means (not shown) downward to an upper case typing positionin'which the segment occupies a lower position in its inclined plane to condition the machine for upper case'typing. The means for supporting and shifting the type bar segment maybe those disclosed inthe previously mentioned Gabrielsonii-Patent 2,028,200, or any other suitable means; Adjacent their forward ends, the type bars are normally supported by the usual upwardly and rearwardly inclined arcuate type bar rest I8 which is supported as usual by means not shown 'to' shift with the type bar segmentl5. v.

Each type bar has pivoted thereto at I9,Yat a point normally above and forward of its pivot I4, the forward end of a different one of the links of a series of rigiddrawlinks 20, the rear ends of which are connected by pivots 2| to the upper ends of the respective ones of a series of'sublevers 22, the links being all of the same length. The pivots l9 and the pivots 2|, respec-' tively, lie in obliquely disposed parallel arcs which are concentric with 'and 'are disposed in planes parallel'to'those 0f the type bar segment and the series of type bar pivots US so that, when the segment is case'shifted, the links 20 willhinge about pivots 2| as is common in segment shift machines.

an end one ofwhich areshownyarepivoted in slots in a vertically disposed segment 94' fixedly held to frame work Land-said sub-levers have The several sub-levers 22 (only a medial and.

being arranged in a straight row extending transversely of the machine forward of the fingers part of the stationary framework ID of the machine. The construction is such that each lever 22" has two arms of substantially equal efiective length."

The lower arm of each sub-lever 22 has pivotally connected thereto at the lower end thereof at 25 the forward end of a different one of a series of rearwardly extending couplers or interponents 26, the couplers being normally arranged in a straight horizontal row across the machine with the pivots 25 in axial register for selective swinga ing of the couplers up and down about a straight horizontal axial line extending transversely of the-machine. .Above and to the rear of their piv- 0ts,'the couplers have connected thereto the forward ends of a row of type bar and coupler return springs 2'! anchored at their rear ends to a part of the stationary framework I 0. These springs normally yieldingly hold the type barsagainst type bar rest l8 and hold thecouplers against a horizontal and straight coupler rest 28 I which extends transversely of the machine. The

couplers normally extend to the rear of rest 28 through vertical guide slots in a coupler guide comb 29 which extends horizontally across the machine, said coupler rest and guide comb being mounted on a part of the stationary framework In and being preferably adjustable fore and aft of the machine. The rear edge of the coupler rest is undercut-as shown at 28, and each coupler is formed with a forwardly facing and forwardly and downwardly inclined shoulder 30 (Figure 8) normally spaced slightly rearward of the undercut rear edge of the coupler rest to permit upward swinging of the coupler about its pivot 25 but engageable with said undercut'edge by a very slight rebound of the type bar from its rest I8 to lock the connected type bar against any appreciable rebound from the type bar rest. Each coupler 26; is formed with a rearwardly facing shoulder 3| which is slightly undercut at its upper extends horizontally across the machine and is journaled at its ends at 35 on the main framework (0. The cross bar of the actuator normally overlies and is spaced above all of the coupler fingers 32, and the straight forward edge of this'actuator cross bar is normally located above and slightly to the rear of the upper ends of coupler shoulders 3|.

;'The actuator 33 constitutes a tappet device which is rockable forwardly a predetermined dis- -*tancc from a normal idle position by means of end and is normally located rearward of comb 29' two constantly tensioned pull springs 36i con'-- the 'ratchet'wheel Bil-concentrically with the conected at their rear ends to the side arms of the actuator and at their'forward ends to the framework III, to impel a selected type bar by spring power toward printing position for final type impressing travel of the type bar solely'under. the influence of acquired momentum'as hereinafter explained.

The actuator 33 is retracted tonormal position by power superior to that of springs 36 and. derived from a constantly rotating shaft 49' which is constantly driven counter-clockwise (as the machine is viewed in Figures 2, 8 and by means of an electric motor 9 while the machine is in use. Said motor is fixedly mounted on the framework Ill within the framework and is connected to shaft 49 by suitable speed reduction driving means 9 also located within the framework Ill. Shaft 49 v extends horizontally transversely of the machine in rear of the actuator 33, is journaled in the framework I0, and

has fixed on its right hand end a ratchet wheel Opposite the ratchet wheel 50, and adjacent thereto at the right thereoflthere is journaled in the framework II] a short crank shaft 5!, the

axis of which is coaxial with that of shaft 49. A pitman 52 has its rear end pivotally and detachably connected to the wrist of crank shaft 5i.

and has its forward end pivotally and detachably connected to a bracket53 fixed on the cross bar of the actuator 33. The front end of the pitman is connected to bracket53 by ashouldered pivot screw 54. At itsrear end the pitman is formed with a hook 55 (Figure 2) engaged over the wrist of crank shaft 5!.

rear end which receives the wristof'the crank shaft :and closes the throat of the. hook, the front end of said plate being detachably held to the rear section of the pitman 52 by a clamp- Crank shaft 5! is adapted to be clutched or connected with shaft 49, for a part of asingle revolution, through the medium. of the ratchet wheel 59 and a pawl 59. Pawl 59is pivoted substantially midway its ends on a horizontal pivot screw Gil extending transversely of the machine and threaded into an arm or pawl carrier "6| which, in turn, is fixed on theleft hand end of the crank shaft 51 to rotate opposite-the right hand face of the ratchet wheel 50f One arm of the pawl has a nose engageable with the teeth of the ratchet wheel, and a torsion spring 62 is A retaining plate 56 (Figures 2 and 9) has a forked prises the normally upstanding arm or'part I2 fixed to and extending above rock'shaft'69, an

upstanding arm 13 having a forked lower end' coiled about a spacing sleeve 62* on the shank of pivot screw and has'its opposite ends engaged with said arm of the pawl andwith the pawl carrier to normally constantly tend to'urge.

the pawl nose into engagement with the teeth of the ratchet wheel.

Means are provided for manually arcuate pawl controlling surface 63 which curves downwardly behind and-under the periphery. of

' arm 12 forwardagainst selecting any f desired type bar for actuation and, for causing incident axes of the shafts 49 and 5! and extends about said axessfor somewhat less than 180 degrees, Thissurfaceis "s0 disposedthat the arm of the pawl-=59 opposite the nose carryingqarm of the pawl is normally engaged withsaidsllrface adjacent-the upper end of said surface as indicated more clearly in- Figures 8 and 10'130 hold the nose of the pawl'out of engagement with the ratchet. At this point inthe revolution of the crank shaft, the wrist thereof is to the rear of- 1 carrying arm'il 'is seated upon and held arrested by a spring-cushioned latching or-stop lever 64 (Figures Band 9); On a working stroke of the actuator 33th'e pawl passes out ofl'engagement with surface 63 at the lower end of said surface and is swung by" its spring into engage-' ment with the ratchet wheel 50 just before the crank shaft wrist reaches a dead center posi v 64 is normallyheld with'the forward end'thereof at the upperlimit of its motion by means of a stiif spring 61 (Figure 8) which is connected to the rear end'of the lever 64 and to arm 65 and is adapted to yield momentarily under impact of arm 6| on the forward end of the latch or stop lever 64." A universalrelease bar 68 extends straightly and horizontally transversely of the machine and is normally located intermediate the cross bar of actuator 33 and the fingers-"12 formed on the type action couplers 26. This release bar 68'is provided with rearwardly extending arms fixedthereto adjacent opposite ends thereof and fixed to a rock shaft SSWhich extends horizontally transversely'ofithe machine at the rear of sai'd bar and is journaled at its ends on framework lilat 69 'A link 10 (Fig-,- ures Sand 9), pivotally connectedat'its rear 'end atl-I to arm 65 near the upper end-of the latter, is adjustably and pivotally connected at its forward end with an upstanding rock'arm 12 fixed toflrock shaft 69." This latter connection "compivoted on shaft-'69 for adjustingmovement fore and aft of the machine, a clamping screw which extends through-a slot'l3 in the adjustable arm '13 above shaft fill and'is threaded into 11, connected'toone'of the release bar supporting arms and to the framework-l0, normally returns the release bar 68 and arm 65. to position the stop 64 in pawl carrier arresting position, said spring normally urging thezupper end of acushion stop 19 held to framework l0. a

Upon upward swinging of any one of the couplers 26 about its piV0t25 into-a position placing coupler shoulder 31 in front of, the cross .bar of actuator 33 for forward driving of; the upwardly swung coupler by the actuator, thefinger 32 of; theuriwardly swung coupler will;rock release barv G8 upward and rearward to disengage stop or. latch 64 from the 'pawlrcarrier;6-|- and release? the actuator-"33 for forward movement by its im-- pelling springs 36. I

The pulling force exertible by the pull springs 36 on the actuator 33 tocause theflatter' to impel aselected type bar to the printing point is pref-' journaled at its ends on the framework I at 4| in advance of shaft'34, extends inwardfrom-the right'hand side of the'frai'nework transversely of the machine to a point near the fore and aft medial line of the'machine and has fixed thereon near its'innerend a pendent rock arm 42 and near its outer end a forwardly extending rock arm 43 (Figures Land 14). Arms" 38 and 42 are connected by a rigidfore and aft extending link 39:

chine substantially above the axis-of shaft 40, has a forwardly'extendin'g arm connected with arm, 43 by a-pull spring 46 and'has an upstanding arm connected by a rigid link 4'! with-the outwardly extending arm of a bellcrank-48; Bellcrank 48 is pivotedon the framework I 0' for swinging adjustments about a'vertical axis 80.

The bellcrank-48 has a forwardly extending han-' dle arm which is slightly resiliently flexible up and down and provided with a latching stud o'r pin BI-releasably engageable in either one of an arcuate series of holes82 formed in a horizontal latch plate 83 fixed to the frameworklO.

series-of-holes' 82, in the'position shown in Figure 1, preferably has no tension or only enough tension to prevent accidental disconnection of the spring from'its anchorages and, therefore, exerts no appreciable force on the aotuator'in this adjusted position of the bellcrank. By' swinging the handle arm of bellcrank 48 out-- wardlyand latching it in one or the other of,

the remaining holes 82, the springAB'may have imposed thereon a normal tension which'will vary with the hole in whichthe pin8I is engaged.

The spring tension thus imposed on spring 46 will be imposed on the actuator 33 in addition to that imposed by springs 30 to thereby increase the type bar impelling force exertible by the actuator.

' The release bar 68 is operablefrom any one of the type keys I00 of the keyboard of the machine to release the actuator 33 for a single advancing and retracting actuation of the actuator. Y

The type keys I00 are arranged in four rows across the machine and are fixed on the upwardly and forwardly extending front ends of short" and parallel fore and aft extending type key levers IOI which have also upstanding rear'ends. The upstanding rear ends'of the key levers IOI are fulcrumed' in slots I02 in a straight horizontal barI03 fixed "to the framework I0 and extending transversely of the machine close to the rear end of the keyboard and below the forward end of the system of type bars, the key levers being fulcrumedion a straight horizontal pivot 'IIPforward against a straight horizontal cushion A bellcrank lever 44,'which ispivotedon the framework Mat 45 .to'rocka bout a hori-' zontal axis extending transversely 'of the' ma-' Holes 82 are-arranged in an arc struck from axis 80.

Spring. 46, when the handle arm'of'bellcrank 48 is latched-in the hole at the inner end of the wire I04 carried by bar I03 and extending through all of the slots I02.

Below thesegment' 94' and the lower ends of sub-levers 22, a straight horizontal bar I05 fixed 5 to framework I0 extends transversely of the machine, is provided with a series of vertical slots I06 across its front edge, and carries a straight horizontal fulcrum wire I01 which'crosses all of said slots I06. Engagedin slots I06 and fulcrumed on wire I01 are identical sub-levers I08 (one for each key lever), said sub-levers lying in parallel vertical planes disposed fore and aft of the machine. Each sub-lever I08 has an arm which extends downwardly from its fulcrum and is formed with a rearwardly projecting portion extending under bar I05 and coupler rest 28 and also extending through the actuator bail 33 be-' portion of the associated one of the key levers IOI adjacent the lower end of said key lever portion. Links IIO are all of the same length, and lugs III are permanently adjustably bendable fore and aft of the machine. The front ends of the links are pivoted to lugs III at l The links IIO for key levers supporting different banks of keys are connected to the pendent parts of the lower arms of the sub-levers I08 at different elevations at I09 I09 I03 and I09 for the first or rear, second, third, and fourth or front banks of keys, respectively, for uniform key dip and uniform rocking of the sub-levers.

To the rearwardly extending portion of the lower arm of each sub-lever I08 is anchored the rear end of one of a row of return springs I I2,

the forward ends of which are anchored to framework I0, to restore the sub-levers, links IIO lever I08 has an upper and short upstanding stop H The fore and. aft extending portion of each type key 1ever"IOI is formed with a pendent'stop lug II4, which is permanently adjustably bendable fore and aft of the'machine and'normally abuts the rear face of a cushion stop device II5 to limit M return movement of the key lever. The stop device II5 extends straightly and horizontally across the machine below the forward portions of the key levers and is clamped in fore and aft adjusted position to the framework I0 by suitable W screwsas II6 which extend through fore and aft extending slots. in the stop device and are threaded into the framework, as shown in Figurec3. vA vertically slotted key lever guide comb H1 is fixed to framework I0 immediately forward of the stop device II 5 for up and down,

movement of the fore and aft extending portions of the type key levers in the slots of said comb,

the key levers for the rear row of keys having their fore and aft extending portions extended v forward of their upturned key carrying portions 5 for engagement in the comb, asshown in Figure 3.

The rearwardly extending portion of the lower armof each sub-lever I08 has pivoted thereon at I I 8 a normally upstanding and fore-and-aft rockable two-armed, coupler-lifting thrust lever H9, the lower arm of which thrust lever is connected by one of a row of return springs I20 to the rear end of said sub-lever arm portion to normally w hold the upper arm of the thrust lever H9 urged and key levers IM to normal position. Each sub stop' I21 Pad I2I is fixed to'a-thrustilever guide comb I22 which is held toframework Ill and extends horizontally and straightly across the .ma-

chine. Each thrust lever H9 has a laterallyfbent upper end portion engageable with but a single associated. oneof the couplers 26, its upper end being normally spaced slightly beneath the finger 32 of the associated coupler. The-rearwardly extending portion of the lower arm of each sub-lever I98 is also formed with a rearwardly extending stop lug I23 fwhich isaperrnanently bendable upland down-and is adapted to "rise into contact ewitha straight horizontal cushionstop pad I24 toe limit the movement of the sub-lever by depression of the type key on the associated keylever and also limitlthe extent of depression of said key, the said stop pad I24 extending transversely 'of the -machine and being fixed to the underface of comb I22.-

- ..Upon depression and release of :any one of the type keys, its associated type bar is actuated to effect a single type impression andto return -'to and remain-in normal position whether or not the key is promptly released. Depression ofthe selected type key lifts'the associated thrustlever H9, which thereupon. rocks the associated coupler 6 upwardly about its pivot25i to place coupler shoulder 3| immediately in front of the cross-bar of actuator or tappet device 33 and simultaneously cause finger 32 of said coupler to rock the release bar 68 upwardly to shift latch 64 rearwardlyvout of engagement withpawl carrier Bl to release the actuator 33. Springs 36 thereupon instantly pull the actuator forward .at highspe'ed to the limit of the forward stroke of 'theactuator thereby driving the coupler forward with a spring impelled tappet action of the actuator on the lifted coupler. At the limit of the forward stroke of the actuator, the sub-lever finger 22*? contacts the associated cushioning rest '23, thus freeing both the release (bar r68 and'the latch device 6465 for instant move ment-back to normal position by spring 111' for arresting the pawl carrier 6| by the latch device 64+65 at the end of a single revolution-of the pawl carrier. On'the return stroke of the type bar by springs 24 and2'Lthe'couplerslides under the release bar,- and, if the type key is still. held depressed, the-coupler finger 32. will abut the upper arm of lifting lever i I9 androck the samerearward below the returned release bar and, when the key is finally released, the

lever H9 will be restored to its normal position .by the associated spring I29. If the keyis .released instantly aftervfull' depression thereof, the :coupler finger 32; will move rearward between the returned. release bar 68 and the returned lifting lever' H9 into: the normal position of the finger and coupler. JJust before the actuator'is fully advanced by its impelling springs 361(or 36 'and 46),-'-the pawl .59 passes out of contact with surface "63 at'the lower forwardlendmof said surface and itsnosesnapsinto engagement .is kickedzoutiof. engagement with the ratchet by coming :intocontact; with the upper end of surface 63 As the pawl is disengaged from the ratchet, its carrier"arm;6,i impacts the restored yieldable-stop'fi i and is finally brought to rest "lOJcy said-"stop-at the starting point or normal position of the. carrier 1 arm. The actuator is thusflp'o'sitiyely retracted to normal idle position againstthe resistance of-springs 36 (or 36 and t6), and the-selected type bar will make but one impression irrespective .of the length of time its controlling-type key is held depressed.

Meansi are provided whereby the escapement of .the machine .-is.nor mally operable by the type bar! actuator .forefiecting a letter space feed of the platen carriagev concomitantly with each type impression, but whereby any selected one,

, or plurality oflselected ones, of the type actions may functioncas accent, silent or'dead type actions, i. e.,type. actions-operable to print with- 5 outcausinga letter 'feed movement of the carriage; Means. are .also provided whereby the escapement. may be manually operated by the .spacerbarof the machine."

The dog rocker5 *carries the usual adjustable retuinstop I25-engageable with a part of framework Ill-todetermine the normal-position of the dog rocker; said. rocker beingyieldingly held in lnormal-position by the usual dog rocker return spring: I26;'"At its-front side the dog rocker is '35 formed with twomclosed spaced parallel and .ver-

ti'cally disposed webs="=I2l projecting forwardly .ifrom-the rocker, between which webs the upstanding arm of an angle lever I28 is closely confined and rockably adjustable.

on a horizontal pin-"I29 which extends between said'webs parallel to andforward of the dog r'ocker pivot fi and "is held to-said webs. Two -fo're and aft extending adjusting. screws I39 arethreadedthrough the dog rocker, one above and the other below the rocker pivot and bear againstthe-rear edge of the'upstanding arm of -Iever I28 respectively above :and below pivot pin 129 to hold the' lever against rocking on its v pivot pin with the lever in selected adjusted relation to the dog rocker. 1 Suitable lock nuts "liit are threaded on screws I30. Lever I28 has a forwardly "extending arm projecting'from the -lower 'end of-its upstanding arm. A rigid escapement-tripping pulllink I3I is connected at its 'upper' -end to "the forward end of said forwardlyextending ar m'of lever 128 by a horizontal pivot I32 for swinging of said link fore and aft' of the machine by 'means hereinafter described. y Below the lever"-I 28 ,"and substantially directly below the pivot I29 thereof and in rear of the frel'ease'b'ar 'rock shaft 69, is a short horizontal rock'shaft I33 which extends transversely of the 'machine ariddsmedially located between the sidesof the'inachine, said rock shaft I33 being journaled at its ends on the framework H] at --'I34.'" Ffixed'to shaft I33 substantially midway between theends of said shaft is a narrow forw'a'rdly extending yoke which comprises a pair of parallel forwardly extending and closely transversely'spaced side arms I35 (fixed to said shaft) andqa lso' ashort horizontal cross pin I35 fixed --at itsends to the forward ends of said side arms.

' The link I3I extends downward through this This lever 0'arm is pivoted substantially midway its ends yoke I I 36, maximum fore' and aft movements of the link being limited by shaft I 33 and pin I36 and sidewise movements of the link-beinglimited by arms I35. The forward edge of link I 3| is recessed adjacent the lower end of-thelink to provide 1 a .hook l I31 which is normally engaged with andunder cross pin I36 of the yoke I35- I36. The shaft I33, arms I38 and I51 (hereinafter described) and yoke I35--I36 form an es.- capement'tripping tappet devicenormally coactive with the hook deviceI3I-I31.

Shaft I33 has fixed thereto totheleftof the yoke I35I36 a pendent rock arm I38 which carries at its lower end a laterally extendin pin or stud I39 movableback and forth in a'short fore and aft extending arcuate-slot I40 in-a pendent arm MI loosely pivoted at'its upper end onvshaft I33. Substantially directlyabove shaft I33 and forward of the constantly running power shaft 49,

there is fixed to framework I0 a shortrod I42 which extends horizontallytransversely of the machin and is located substantially medially of the sides. of the machine. A torsion spring I43 wrapped around this. rod has its oppositeends abutting shaft I33 and a pin.I44 on link I3I'to, I

normally hold-the link pressed. forward against pin I36 of yoke I35.I36 with the hook I31 on said link engaged with-and under said pin I36.

A torsion spring I 45 wrapped around shaft .I33

has its opposite ends engaged with rod I42 andz with pin I39 on rock arm I38 to normally hold said pin I39 engaged with the forward end of slot I40 in the pivoted arm I4 I. The lower. end of the freely pivoted arm MI is connected 1by;a rigid forwardly and downwardly extending link I46 to the rear end of anormally forwardly and downwardly extending rock arm I41 fixed on the rockshaft 34, to which shaft 34 they type baractuator 33 is also. fixed as previously described,

thu providing av toggle for actuating the escape--'.

ment tripping tappet device. V 7

An escapement disablingrockshaft I48 extends horizontally transversely of th machineacross the entire system of type actions, saidshaft-being journaled at, its ends at I49 on framework I0 and passing between yoke I35,I 36 and the link I46 forward of arm MI and in rear of the sub-levers I08. For each type key I00 of the keyboard selectedto function as a silent or accent key, there is detachably clamped to shaft I 48 a J- shaped tappet I50 which extends forwardly from said shaft, two such tappets for two different keys being shown in Figure 1. It will be understood that as many of these tappets as desired may be employed. Eachsuch tappet is clamped to shaft I48 by a clamping screw I5I engaged with the legs thereof with shaft I48 between said screws and the bend connecting the legs of the framework I0, normally urges said shaft clock- -wise as viewed in Figures 2 and 11 to urge a stop ---I55,:held.to said shaft, against a stop I56 fixed :onframework I0, to thereby normally yieldingly hold tappets I50-I5I and I'52I53 positioned as shown. Stop I is constructed similarly to tappets I50I5I for clamping of the stop to shaft I48 vin different adjusted positions about said shaft. The shaft I48, and the several arms or tappets I5I and I52 fixed thereto, form a springreturnedescapement disabling tappet device.

The spring-returned escapement tripping tappet device, comprising the shaft I33, arms I38 and I51, and yoke I35I36, is also manually rockable by a space bar I63 in the keyboard portion ly yieldingly maintains pin I58.at the forwar end. of slot I59.

,To the lower end of arm I60 there is pivoted at llil the rear end of a long fore-and-aft extending space-bar-actuated link- I62 located sub stantially. midway between the sides of the machine The space bar I63 is located forward of the rows of type keys I00 of the keyboardand .will be hereinafter more particularly described in connection with other details of the keyboard portion of the machine. Belowand forward of the front row of type keys of the keyboard there is journaled in the framework I0 ahorizontal rock shaft. I65 which extends transversely of the ma- 40 ends are two forwardly extending rock arms I66 chine. Fixed to this shaft adjacent itsv opposite connected atptheir forward ends, by horizontal pivots I61- which extend transversely of the machine, to two rearwardly extending brackets I68 J-shaped tappet. The longer leg of each tappet extends forwardly to immediately overhang the rear portion of the desired sub-lever I08, each such tappet overhangingonly a single sub-lever. Each tappet employed is adjustably clamped to the shaft by its screw I5I foraxial and radial adjustment respectively along and about said,

shaft. Fixed on shaft I 48 is a rigid upstandin ppet arm I52 provided at its upper end with a laterally extending lug I53 normally disposed immediately in front of the lower end of the escapement trip link I3I below hook I31 of said link and disposed out of the paths of normal escapement tripping movements of the link I3I and yoke I35I36. A return torsion spring I 54 (Figure 13) wrapped around shaft I48 and having its ends engaged with said shaft and withfixed to the space bar and located under the top of; said space bar. Two fore-and-aft extending links I69, parallel to and at a higher level than arms I68, are pivoted at their forward ends at .I10 to'brackets I68and at their rear ends at "I to;framework; I0 above the shaft I65 for up and down rocking of said links in parallelism with said arms. Substantially midway its ends and substantially medially of the sides'of the machine, the rock shaft I65 has fixed thereto. a pendent rock arm I12, the lower end of which arm is connected by ahorizontal transversely extending pivot I13 to the forward end of the space baractuated link I62 above described. A pair of space bar return springs: I14, anchored to the space bar and to framework I0, yieldinglyhold the space bar and its connected escapement operating train l69I66-I12-I62-I60 normally positioned as shown, while arm MI and its connecting train I46I4'1 to the. actuator.- 33 are normally positively held positioned as shown by thenormally retracted and latched actuator 33, 'andthe escapementtripping tappetdevice I38-.- -I 51-.-I33-I 35l 36 is normally yieldinglyheld-as .shown by spring I45. The. space .bar return springs I14 normally yieldingly hold one headof a double-headed cushion stop. I15, fixed'on rock arm I12, pulled forward against a pendentstop finger I16 formed on a part of framework I0 whichfinger is permanently bendablefore-andaft .of the machine, and depression of'the space bar is limited by engagement of the other head connection to said device. The lost-motion in these two connections is normally taken up by the action of spring I45 on pin I39. Rocking of the escapement disabling device (comprisingparts I52, I53, I55, M8 and one or more ofthe tappets i5l-I5l) by depression of a silent, dead or accen't type key swings escapemen't trip linkl3l rearward to disconnect its hook 131 from "pin lifiof theescapement tripping tappetdevice on the down stroke of the key prior to release of the actuator 33 and prevents actuation'of the escapement dog rocker 5 by the ensuing type-impressing operation of the actuator 33.

When any type key is depressed and released, the actuator 33 will move forward. and then be retracted and latched; as above described, to

' cause the associated typebar to print and-permit return of the type bar. If the keyis one of the ordinaryor live-keys, the reciprocation of the actuator will trip the escapement to feed the platen carriage one letter" space, but, if the actuatedtypgkey is a dead or accent key, the

rear end of its associated sub-lever I08 will, when lifted by manual depression of the key, rock the associated dead key tappet l50-l5|' to thereby rock the shaft M3 andthe escapement diasabling tappet l52l53 on said shaft to swing link'l3l dog rocker is power actuated concomitantly with a type bar, said dog rocker is likewise spring-impelled and spring-returned.

The main framework of the machine includes a base casting having side walls It, a rear wall l and a front wall It. secured, by screws H8, a flat keyboard guard plate '59 which inclines downwardly and forwardly to the top inner edge of front wall l0 of the casting. All of the keys of the keyboard (including the type keys I00 and the usual special keys) are disposed in an inclined plane parallel to'that of plate I19, and the plate is provided with circular apertures 180 (one for each such key). The keys normally protrude through these apertures with their lower portions loosely engaged in the apertures, and the dimer the keys is such that their tops are substantially flush with the top face of the *plate at the lower limit of key depression, the tops of the keys being inclined parallel to said plate. The dip of the keysand.

To this casting ther is space bar are all equal and of very slight extent,

namely about one-eighth of an inch; one purpose of the construction shown being toprovide for such slight uniformkey and space bar dip.

The front wall 10 of the base casting is recessed along its top-and "front atv l8l and I82, respectively, between the ends-of said wall to accom- -modate the spacebar and its supporting means and return springs, and-permit the slight operative depression ofthe. space bar, with the space a bar located withinthe confines of the front and side walls [Me-Ill The space fba'r is formed of sheet metal or'rigid sheet'mate'rial and has aflat,

forwardly and downwardly inclined topfportion 1E3, disposed in a plane parallel to theplanes of plate H9 and the keys I00 andnormally 'l ocated in a plane intermediate those of the plate and the key tops; for engagement by a thumb of the typist to depress the space bar. The rear edge of part 163%015 the space baris provided'with a pendent stifiening'flange IMP-opposed to the'front'edge of plate H9; Pendentfromthe front edge of part I63 of the space bar is a skirt portion I63 extending downward substantially" to the bottom'of the base casting-in front of recess 182- in the front wall of the casting and in'iront'of springs I14 which are-anchored at their lower ends to pins I14 on this'ski'rt. The skirt is flush with the front face-of the end-portions of'the front wall lll -ofthe base'casting. i A compact keyboard'and space bar assembly inwh'ich' the keys an d space bar'may be easily and comfortably manipulated is thus provided. f

The concept of combining a series of springreturned type bars anda spring returned escapementdog carrier'with a normally-idle key-controlled" and power-actuated tappet mechanism which is spring-impelled to concomitantly acti-. 'vate the dog carrier and a key-selected type bar in opposition to the'returnspring force constantly exerted on said dog carrier and; type bar, afiords .cannot positively jam an escapementdog'ag'ainst theescapement wheel-upon sluggish letter feed movement of the carriage and thereby. either a damage the escapemen't dog or wheel. and/ or power mechanism or jam the machine against operation with the parts out'of normal" position.

The further concept 'of embodying in said tappet mechanis'm'a universal type bar impelling tappet, and also a spring-returned dog-rocker.-

-impelling tappet operable "in opposition to its return spring from thef'type barimpelling tappet by a purelythrust connection or tappet like actlon, and of combining with said two tappets a manually operated and spring-returned space bar having a solely one-way thrust connection with the dog rocker impelling tappetfor rocking the latter in opposition to its return spring, provides simple and effective means wher eby the escape- -ment may be tripped by'the power-actuated type 'bar impelling tappetwithout moving the space bar and may be trippedf by the' space bar without causing a'power actuation of the type bar impelling tappet, V r

The furtherconcept ment tripping interponent yieldingly normally interposed for actuation by the dog rocker impelling tappetof the power actuated tappet mechanism, and of associating with said interponent a spring-returned; escapement disabling tappet manuallyoperable by any predetermined onegor *ones, of the keys during depressingpf the latter to shift'the interponent temporarily-out of the path of the dog rocker impelling tappet,--afiords a simple and compact and eflicient arrangement ,wherebyeny 1predetermined one or onesof, the

keys may function as silent or; accent keys for effecting printing without-letter spacings a The construction and arrangement of the parts constituting the keyboard portion of the machine permitsactuation of the keys and space bar with maximum ease and comfort and a minimum of exertion, and also provides a compact keyboard portion which has a pleasing appearanceand, also reduces the length ofthe machine.

llt will be observed also that the construction and arrangement of the power actuated-tappet mechanism andof the key operatedjmechanism tappet actionor thrust action in one direction" only, andthe concept of such an assembly of mechanisms ordevices makes possible precise relative adjustments between the several inter- ..related mechanisms or devices for correct, and eflicientaction. and also makespossible separate assembly of the seyeraldevices ormechanisms for more facile andcorrectassembly of the'parts of the machine. I

The key-operated trains are adjustable relatively tothe couplers 26 and the type bars con- 'nectedtherewitnand are operative on the couplerswith a tappet action; the release bar 68 and the actuator 33 are separately, adjustable relative- 1y to the couplers which act on the release bar with a tappet action{ the escapement tripping tappet accommodates itself to: adjustments-of actuator 33 and the spacebar, both of which are effective ,on said tappet solely with a tappetor thrust action in one direction only; theescapement tripping tappet acts onlink l3l with a tappet action.

and this link is adjustable relatively to the tappet by reasonof its adjustable anchorage ,to the:escapeme'nt dog rocker; and the dead or accent key tappet device is actuated by a tappet action'thereon of predetermined ones ,of-the, sub-levers I08.

and is operable upon; link -I 3] with respectgto which, and to the key operated mechanisms which act on said dead key tappet device, the latter is adjustable by reason of the adjustable clamping anschorages of elements I5 0 and-stop I55 to shaft The provision of the aforesaid correlated assembly or interactive tappet devices or mechanisms constitutes one'important featureofgthe :inventive conceptionegemplified by the construcof providing an escapemove the same in one direction only.

.tion illustrated in the drawings and described above. J l

; I, claim: ,7 I

1. In a typewriting machine, the combination of a platen carriage, a platen on the carriage, a

actuator, spring means for impelling said actuator in one direction, superior power means ,for

retracting the actuator against the power of said spring means, interponents connected with the respective type carriers and normally out of the field of movement of the universal actuator, type keys, an interponent setting train for each type key and interp onent and each operable by depression of its associated key to engage and set its associated interponent for actuation by the universal actuator on the spring-impelled stroke of the latter to propel the associated type carrier toward the platen, means operable by setting movement of anyone of said interponents torelease the universal actuator for a single vibration of said universal actuator by its impelling spring means and the a superior power means and to thereupon lock the actuator in retracted position; a separableactuatingtrainbetween the universal actuator and'the escapement dog carrier the separable, portions; of whichare connected respectively to the dog carrier and the universal actuator, a return spring for the dog carrier and the portion of said dog carrier actuating train connected with the carrier, a return spring for each keyand its associated interponent setting train,

;a return spring for each type carrier and its associated interponent, and a spring-returned escapement disabling device operable by interponent setting movement of one or more of the ,interponent setting trains to separate the dog carrier actuating train to prevent actuation of thedog carrier by the universal actuator.

. '2. In a poweractuated typewriting machine, the combination of a platen carriage, a platen thereon, spring-returned printing instrumentalities, a carriage escapementincluding a spring-returned escapement dog rocker, individual type key controlled mechanisms forselectively conditioning the respective printing instrumentalities for printing actuation, a single actuating mechanism for concomitantly actuating both the dog rock- -er and any selected printing instrumentality in opposition; to the return spring power exerted on said rocker and instrumentality, a motor constantly driven while the machine is in use, spring means ior'impelling said actuating mechanism to actuate the dogrocker and selected printing instrumentality in opposition to the return spring power exerted on the rocker and selected printing instrumentality, and means controllable by each of said key-controlled mechanisms to release said actuating mechanism for spring impulsion thereof and-to thereafter first connect said mech- -.anism tosaid motor for motor actuation of said mechanism in'opposition to the power of its impelling spring means and then disconnect said motor from said mechanism and hold the latter against operation by its impelling spring means, said single actuating mechanism for concomitantly actuating the dog rocker and selected printing instrumentality being operable thereon to .trolled printing instrumentality selecting mech- =7,5

anismstopreventactuation of the dog rocker to positively move a type carrier to its printing limit, spring means for returningieach .type carrier and its individual actuating means to normal position following actuation thereof by the actuator, a platen'carriage, a platen on the carriage with which the type carriers are coactive toeffect printing impressionsyan ascapem'entfor'letter spacing the carriage including a spring returned escapement dog rocker, a spring returned escapement-actuatingtappet devicefor actuating the 'dog rocker in opposition to the return spring power exerted on the dog rocker; and means positively connected with the universal actuator and having a thrust connection only with said tappet device for moving the latter, in opposition to the return spring power exerted on said device, during type carrierimpelling.strokes of the universal actuatorr l 5. A power actuated typewriting'machine, as claimed inclaim'4, wherein the connectionbetween the escapement actuating tappet device and the dog rocker comprises a' hook normally spring held in position for actuation by the escapement-actuating tappet device, and wherein a spring-returned escapement-disabling device is providedhaving one or more tappet elementsior manual actuation of said device by one or more of the type'keys and also having a tappet element operable upon said hook'to shift the latter out of operative relation to the escapement ac; tuating tappet device to thereby permit, typing operation of selected type carriers of'the machine without concomitantletter spacing, of the car.-

riage. a

6. A typewriting machine, as claimed 'ina'claim 2, wherein the impelling spring means "for said single mechanism 'for concomitantly" actuating the dog rocker and a selected 1 rinting. instrumentality comprises constantly tensioned 'im-' pelling spring means anchored to said mechanism and to the framework of the machine, an auxiliary impelling spring means anchored to said mechanism, and anchoring means on the framework of the machine fortsaidauxiliary 7 spring means manually adjustable to vary/F the force exerted by the: auxiliary spring Jmeans-"on said mechanism, to thereby vary the spring force transmissible by said mechanism to the 'dogrocker and type carriers of the machine.

'7. In a'typewriting machine, the combination of a platen carriage, a platen on the carriage, an escapement for the carriage including a spring returned dog rocker type bars coactive with'the actionoi the actuator, power means controlled by each driver tocause a single reciprocation of the actuator when the associated sub-lever is actuated, a separable connection between the dog rocker and actuator for operating the'dog rocker inopposition to the return spring-force exerted on the latter, and a spring-returned 'escapement disabling device ope able on said sep-.

arable connection toxtemporarilyibreak the lat ter and including portions engageable by selected ones of the sub-leversto actuate said device.

8. Ina typewriting machine, the combination of a mainframe, a platen carriage mounted on the main frame to. traveltransversely thereof, a platen on the carriage, a system of type bars located below and in front of the platenand supported in the main frame for upward and rearward swinging of any selected tyIpe' bar to the platen for printing coaction with the platen, a carriage feeding escapement includinga foreand-aft rockable dog rocker located'behind the system of type bars, a fo-re-and-aft rockable type bar actuating bail located between and below the dog rocker and, type floarsystem and having a horizontal cross-bar extending transversely of the machine and pendent side arms pivoted on thev main frame, an operating connection between said actuator and dog rocker, a row of ,fore-and-aft extending type bar driving interponents positively connected with the type bars and normally aligned horizontally and transversely of the machine out of the field of movement of the:- cross-bar of the type bar actuator and each having a finger normally extending under said cross-baranda rearwardly facing shoulder moyalbleupward into the fieid of movement ofisaidcross-bar, return spring means for each type bar and itsv connected interponent,' a system of sub-levers. fulcr-umed for rocking about ahorizontal axis extending transversely of the machine forward of the system of interponents and each extending downward and then rearward below the system of interponents through said type bar actuating lbail, a row of fore-and-ait extending links connected at their rear ends to the downwardly extending portions of'the' sub-levers, a system of type key carrying'levers having upturned key-carrying front end portions'and also-having upturned rear end portions fulcrumed'at their upper ends on the main frame for'swinging about a common horizontal axis extending transversely'of the machine below the system of type bars, return spring means for each connected key-carrying lever and sub-lever and link, means carried by each sub-lever for shifting a difierentone of the interponents upwardly to position its rearwardly facing shoulder'directly in advanceof the crossbar of the actuating bailto receive a blow from said cross-bar, and power means controlled by lifting movement of any one of said intenponents to rock said actuating bail first'forward and then rearward and thereafter hold the bail innormal retracted position.

9. A typewriting machine asclaimedin' claim 8, wherein the key levers are of different length to support the keys infour rows extending across the machine, the sub-levers are all identical, and the links connecting the key-carrying'levers and s'ub-levers'are all of the same length andare connected'to the downwardly extending portions of the sulb-levers at different elevations for the different rows of: keys for uniform dip. of'all' keys and uniform rocking of the sub-leversrby'the keys.

10. A'typewriting machine as claimed in claim 8, wherein the key levers are of different length to support the keys in four rows extending across the machine, the sub-levers are all identical, and the links connecting the key-carrying levers and sub-levers are allof the same length and are connected to the downwardly extending portions of the sub-levers at different elevations-for the different'rows of keys for uniform dip of all keys and uniform rocking of the sub-levers by the keys, the tops of all of the keys are normally disposed in a single downwardly and forwardly inclined plane, and a guard plate is held to the main frame in a plane parallel to that of the key tops and has perforations in which the keys are movable down and up, and a spring-returned space bar connected to said dog rocker is mounte ed within the forward limit of the main frame forward of the keys, is supported in advance of the guard plate for depression to actuate the dog rocker, and has a top thumb-impact receiving surface inclined in a plane parallel to and intermediate those of the key tops and guard plate.

11. A typewriting machine as claimed in claim 8,-wherein the key levers are of different length to support the keys in four rows extending across the machine, the sub-levers are all identical, and the'links connecting the key-carrying levers and sub-levers are all of the same length and ,are connected to the downwardly extending portions of the sub-levers at different elevations for the different rows of keys for uniform dip of all keys and uniform rocking of the sub-levers by the keys, the tops of all of the keys are normally disposed in a single downwardly and forwardly inclined plane, and a guard plate is held to the main frame in a plane parallel to that of the key tops and has perforations in which the keys are movable down and up. r V

12. In a typewriting machine, the combination of a main frame, a system of normally forwardly I extending type bars mounted in the frame for upward and rearward swinging of the type bars to-print, a type bar actuator mounted on the frame for fore-and-aft movement and having a straight type bar impelling edge extendin horizontally transversely of the machine, a row of identical fore-and-aft extending type bar driving interponents positively connected to the type bars and normally aligned horizontally transversely of the machine, each interponent having a rearwardly facing shoulder presentable in front of said actuator edge by upwardgmovement of the interponent, return spring means for each type bar and its-driving interponent, a row of identical sub-levers normally aligned horizontally transversely of the machine and each having an upstanding forward portion and a portion extending rearward below therow of interponents, means supporting the upstanding portions of the sub-levers for rocking about a common straight. horizontal axis extending transversely of the machine, means on the main frame for supporting the interponents in their normal returned position, interponent lifting means carried by the rearwardly extending porsub-levers for uniform dip of all the keys and uniform rocking .of the sub-levers by key pression.

13'. In a typewriting" machine, the combination of a normally idle and reciprocably mounted type carrier actuator, individual-type key operated meansfor selecting a typecarrier for actuation, power-operated means for effecting a single re ciprocation' ofi said .actuatorzupon ,actuation of any one of saidtype key operatedmeans, a second actuator I for actuating the letter spacing means of the machine having a lost-motion connection' with said type carrier actuator for. actuation of the.secondvactuator'bythe type carrier actuator, means normally and separably en aged Withsaid second actuator for' operation by the latter to actuaterthe letter spacing meansl of the machine, a disabling device operable on the lastmentionedimeans todisconnect'it from the second actuator, a plurality of 'tappets detachably heldto the disablinglgdevice for engagement by selected ones of the "key operated means to cause saididisabling' device to temporarily disconnect the separably engaged means from the second actuator, and a space bar'having a lost-motion operating connection with the second actuator to manually operate thesecond actuator independe ently of actuation ofthe type carrier actuator.

14. Ina typewriting machine, the combination of aplaten carriage, a :platen on the carriage, a letter feed escapement for said carriage including' a spring-returned escapement dogrocker, spring-returned individual type bar actuating means, type bars each coactivewith' the platen and positively connected with a different one of said individual type bar actuating means, a tappet mechanism, spring means for actuating said tappet mechanism to concomitantly impel the dog rocker and any selected one of said individual type bar actuating meansin opposition to the return spring force exerted on said dog rocker.' and the selected type .bar actuatingmeans to trip the carriage escapement and effect a type impression, a single cycle power mechanism for automatically restoring the tappet mechanism following each actuation of said tappet mechanism by its actuating spring means and releasablyuholding said tappet mechanism in restored condition, type keys for the respective type bars, and a plurality of individual spring-returned means each positively connected with a different type key for manual operation thereof upon depression of its connected key to concomitantly release the tappet mechanism and condition the individual actuating means for the associated one of the type bars to receive an impelling blow fromthe tappet mechanism upon the ensuing spring actuation of the released tappet mechanism 7 15. A typewriting machine according to claim 14,;wherein:the'tappet mechanism comprises an escapement tripping tappet and an actuating tappet'for. the several individual type bar actuating means, whereina tripping element is pivotally held to the escapement dog rocker for swinging of said element into and out of the field of movement of the escapement tripping tappet and is normally yieldingly held positioned for actuation by said tappet, and whereinmeans'are provided operableby one of said individual type key oper ated means, upon depression of the associated type key, to swing said tripping element out of the field of action of the escapement tripping tappet; 1 g i 16. In a typewriting machine, a platen carriage, a platen on the carriage, a, carriage escapementincluding'a spring returned. escapement dog rocker,--an oppositelyshiftable and normally idle type carrier actuatontype carriers normally dis,- connected from said actuator, spring means for moving said actuator from idle position to impart a printing stroke to any selected one of the type carriers, superior power means for automatically restoring the actuator to idle position, means for automatically releasably locking the actuator in idle position upon restoration of the actuator, type keys for the respective type carriers, means operable by depression of either one of the type keys to concomitantly release the actuator from said locking means and establish a driving connection between the actuator and the type carrier associated with the depressed key, an element positively connected with said actuator for opposite shifting of the element by the actuator, an oppositely shiftable dog rocker tripping tappet, a return spring for said tappet normally yieldingly holding said tappet thrust against said element for movement of the tappet by said element on the spring impelled strokes of the type carrier actuator, a hook pivoted to the dog rocker, a spring connected with said hook to normally hold said hook swung into the field of action of the dog rocker tripping tappet for actuation to rock the dog rocker in opposition to its return spring on the spring impelled strokes of the type carrier actuator, a spring-returned escapement-disabling tappet device, and tappet means operable by one of the type keys upon key depression to actuate escapement disablin tappet device to cause the latter to swing said hook out of the field of action of the dog rocker tripping tappet.

17. In a typewriting machine, a platen carriage, a platen on the carriage, an escapement for the carriage including a spring-returned element movable in opposition to the return spring force imposed thereon for tripping the escapement, a tappet for so moving said element, type carriers, selecting keys for the type carriers, and power actuated means controlled by the respective keys for concomitantly actuating said tappet and a selected type carrier.

18. A typwriting machine,-as claimed in claim 1'7, having a spring-returned manually depressible space bar, and an element positively oppositely shiftable by said bar, and wherein said tappet is movable independently of the power mechanism and said element and is normally yieldingly held in position for thrust actuation of said tappet by said element during the down strokes of the space bar and by said power mechanism during printing strokes of the type carriers.

19. In a key-controlled power-actuated typewriting machine, .a main framework including a base casting having side and rear and front walls of a low maximum height not substantially exceeding the maximum height of the keyboard of the machine, four parallel rows of downwardly and forwardly inclined spring-returned manually depressible type keys all lying in a single downwardly and forwardly inclined plane and located within the front portion of said base casting with the front one of said rows of keys close to the front wall of said casting, the front wall of said casting being recessed along both its top and front faces intermediate its ends, a flat forwardly and downwardly inclined guard plate fixed to said base casting and extending rearward beyond the keyboard from the upper edge of the front wall of said casting and having four rows of apertures from which the type keys protrude upward, a manually depressible and spring returned space bar movable down and up in and ill substantially covering the recesses in the front wall of said" casting and having a flat downwardly and forwardly inclined thumb impact receiving top surface normally disposed in a plane parallel to and intermediate those of the type key tops and said guard plate, means for limiting depress ing and return strokes of the type keys, means for limiting depressing and return strokes of the space bar to an extent substantially equal to those of the type keys, the depression limit of the typekeys being such that their impact receiving top faces are depressible substantially to the plane of said guard plate, a platen carriage supported on the framework to travel transversely of the machine above the rear portion of the base casting, a platen on the carriage. a system of type bars supported above the base casting intermediate the platen and keyboard, an escapement for the carriage, normally inactive power actuated mechanism for actuating the escapement and type bars located within the rear portion of the 'base casting, an operating connection between the escapement and power mechanism, individual normally ineffective operating connections between the type bars and power mechanism, means operable by the type keys and located within the base casting for activating the power mechanism for a single cycle of operation and selectively rendering the individual connections between the type bars and power mechanism efiective, means located within the base casting and operable by the space bar to manually trip the escapement through a part of the operating connection between the escapement and said power mechanism, and activating power means for said power actuated mechanism located within the framework.

20. In a typewriting machine, the combination of a platen carriage, a platen on the carriage, spring-returned type carriers bearing types coactive With the platen, a letter feed escapement for the carriage including a spring-returned escapement dog carrier, a spring-returned tappet for actuating the dog rocker, a power-actuated tappet mechanism for concomitantly actuating any selected one of the type carriers and said dog rocker actuating tappet in opposition to the return spring forces exerted on said tappet and selected type carrier, spring means for impelling said power-actuated tappet mechanism to 50 actuate the dog rocker actuating tappet and selected type carrier, power means for retracting said power-actuated tappet mechanism in opposition to said spring means and holding said mechanism retracted, driving interponents positively connected with the respective type carriers and normally out of the field of action of said poweractuated tappet mechanism, spring-returned tappet devices individually operable on the respective driving interponents to position any selected interponent for driving of the latter by the power-actuated tappet mechanism upon spring impulsion of said mechanism, spring-returned means engageable and shiftable by the selected coupler upon positioning movement of the latter by its associated actuating tappet device to release the power-actuated tappet mechanism for impulsion of the latter by said spring means, and a spring-returned tappet means operable on said dog rocker actuating tappet independently of said power-actuated tappet mechanism for effecting letter spacing of the carriage without printing.

21. A typewriting machine, as claimed in claim 20, having a vspring-returned escapement-disabling tappet device operable by either one of a selected plurality of said interponent positioning tappet devices, and a'dog rocker actuating interponent connected with the dog rocker and normally yieldingly held positioned for actuation by the dog rocker actuating tappet and movable out of the field of action of the latter I by said escapement-disabling tappet.

22. A typewriting machine, as claimed in claim 20, wherein the interponent positioning tappet devices are each'individually adjustable w ponent toward and from its actuating tappet.

CHARLES WALKER.

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