US936833A - Printing mechanism for type-writers. - Google Patents

Description

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R. w. UHLIG. PRINTING MEGHANISM FOR TYPE WRITERS.

APPLICATION FILED DEU. 18, 1908.

936,833, Patented oct. i2, 1909.

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R. W. UHLIG/ 4 PRINTING M EGHANISM FOR TYPE WRITERS. APPLICATION FILED DBO. 18, 1908.

936,833. Patented oct. 12, 1909.

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R.' W. UHLIG.. n PRINTING MEGHANISM FOR'TYPE WRITERS.

APPLIOATION mman DEo.1a','19oa. 936,833.

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PRINTING MECEANISM FOR TYPE WRITERS.

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, I R. W; UHLIG. PRINTING MEGHANISM FOR TYPE WRITFRS. v

l APPLICATION FILED 135:0. V18, 1908, 936,833.

Patented oct. 12,1909.

UNITED sTAr/ns PATENT orion.

RICHARD W. UHLIG, OF U-THERFORD, NEW JERSEY, ASSIGNOR TO EMERSON TYPE- WRITER COMPANY, F CHICAGO, ILLINOIS, A CORPORATION 0F MAINE.

PRINTING MECHNISM FOR TYPE-WRITRS.

p specification of Letters Patent.

Application filed December 18, 190B. Serial No. 468,135.

To all whom i may concern.: l' Be it known that I, RICHARD W. UHLIG, a citizen of 'the-United States. residing at Rutherford, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements inPrinting MechanislnforType-Wvriters, of which the l following is a specification. The principal object of the present invention is to so. construct and combine the various devices comprising the printing mechanism of a` visiblewriting typewriter that the key action of the individual keys will be g equ'alized from end to end of the several banks of keys, and so that the key action of all of the banks will likewise be equalized. In this manner each of the keys will require l the same stroke or blow to produce an equal impression on the paper, whereby the resultf ing action of the type will be uniform, and the impressions registered on the paper will be even throughout. This, of course, results in a much clearer and neater copy than i would result from a machine in which some' of the type strike the paper withA more force il than others. Every essential portion of the printing mechanism is devised with respect to this principle of operation, and the key levers, key lever springs, key lever stops, cranked type bars, universal bar-tand other portions of the mechanism, are all proportioned and combined together in such mani ner as to equalize the resulting action of the n Fig. 6 a face view of the universal bar; ld

machine as a whole.

The invention relates to the construction E of the individual elements above named, as well as others to be hereinafter referred to, and to their1 combination and oordination'- in the manner to be hereinafter described.

The invention .further relates to the construction of the type bars themselves and to the method of nesting them together in order to secureequalization of the stroke; as well as lightness of construction, perfection of action, and rigidity in mounting; `and also f to the guideways provided for centering each of the type heads so as to register its stroke in the exact spot-intended on the printing line. The .object of the guideways is to prevent any imperfection .in the stroke Wlnch '2 might result from distortion of -the type bar clue to lack (insufficient rigidity, or to vibral tion or originator acquired imperfections in t the mountlngfor-the type bar, all of which variations from the normal are prevented by i the action of the guideways which hold the type head rigidly at the moment it strikes the 'paper on the platen, whereby a firm even blow is registered and all vibratory movement avoided.

The invention further relates to the means provided for vertically shifting' the type bar frame to bring any one of three styles oftype into register with the printing line; and to the machine as a whole and the individual arts thereof.

Furt er objects will appear from a detailed description of the invention, which 4consists in the features of construction and and showing in dotted lines the journala sockets on the right hand side; Fig. 4 a longitudinal/sectional view through the frame,

showing on one side the variations in the' position of the cranks of the type bars; Fig. 5 a sectional elevation, taken on line of l4`ig.2, looking in the direction of the arrow;

1 7 a face view of the key lever stop bar; Fig. 8 a sectional View, takenthrough the machine from front to rear near the left edge thereof, and showing the vertical shifting f mechanism for the type bar frame; and Fig.

9 a set of three keys, showing the relation of the keys to one another.

The machine as a whole is built into a. framework which comprises a flat top wall 10 of rectangular` shape, which is cut away in front to provide space for three banks of keys. The framework further comprises a pair of side *Walls 11, which are earned for- Ward in front .of the top wall in the form 'of extensions l2, whichare connected by means of a front rail 13 forming an inclosure, of the' usual character, for the keys and key levers. The side walls arevconnected by means of front and rear cross walls 14 and 15, respectively, and the framework' as a whole is mounted upon cushion feet 1 6 suit- Iatented Oct. i2, 1909.

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'ably positioned to provide a firm support for the machine'.

The keys are arranged in .three banks, an upper bank, 'an intermediate bank, and a lower bank; although the invention is not limited to the employment of three banks, since four banks or any other number mightv InS-view of the fact that three banks of keys are-employed, it is necessary to` employ key. levers of. three diiferent lengths,- a series of short key levers 17, intermediate key levers 18, and long key levers 19, bestshwn in Fig. 9. All of the keyl levens are pivoted, at their inner 'ends,vto a transversely extending key lever rod` 20, which extends from side to side of the machine and has its Iends rigidly entered and held within the side walls of the framework. Each of the key leversis .provided with an upturned forward end 21, which receives al button 22 of thef usual character; and the upturned ends ofthe key levers com osing vthe three `banks are of a length to a ord a ment with the `rod upon which they are mounted and prevents any .interferenceone` upwardly projecting arms 25, 2 6, and 27,v

with the other. The long, intermediate, and short key lever`s are of bell crank formation and are provided, at their inner ends, with respectively, which are of varying length, as best indicated in Fig. 9, the long, intermediate, and short arms being formed on the long, intermediate, and short levers, rcspectively. y

The inner angle of each of the key levers is extended to form a prong 28, and the prongs of the short, intermediate, and long levers areprovided with lower, intermediate, and upper bosses 29, 30, and 31, rcspee'. tively, as best shown in F ig. 9. The prongs of the key levers operate within slots.32 in a. cross guide flange 33 which depends from the top wall of the framework and extends in parallel relation with and slightly to the rear of the front cross wall 14, as best shown in Fig. 2. ,Immediately in front of the guide liange 33 is located a universal bar 34, the peculiar shape of which is shown in'l` Fig. 6. The universal bar 34 is provided, on its'upper edge, with. three eyes 35 embracing a rod 36 which serves to hinge the universalv bar at its upper edge and permit the bar to be swung back under the pressure imparted ,by the key levers. The .lower edgey of the universal bar is cut away to provide long, intermediate, and short prongs 37, 38,

and 39, respectively; andthe key levers are' mounted on their rod in suitable position to bring the lower bosses 29 onthe short levers into engagement with the long prongs 37;

the intermediate bosses 30 on the intermediate levers into engagement with the-intermediate prongs 38 ;V and the upper prongs 31 on the long levers into engagement with the short prongs 39 of the universal bar. The arrangement is such that by depressing one of the upper keys with its short lever a given distance, as, for instance, half an inch, a

-greater angular' degree of movement will be imparted tothe lower boss 29 than will be imparted to'the upper boss 31 by an equal depression. of one` of the .longkey levers.

'Inequality ofmovement, however, is compensated for partly by the fact that the lower bosses 29on the short levers are closer tov the pivotal ,point than the upper bosses 31 on the long levers; and the resulting action is further equalized in viewof the fact that the lower bosses contact the long prongs 37 which are farthest from the axis of movement of the .universal bar, while the upper bosses 31 contact the short prongs which are closest to the axis of movement. By the arrangement "above described, inequalities of movement'in the universal bar, which otherwise would f result freni differences in the lengthsl of the key levers, are equalized, and likewise the stroke or blow required to actuate the individual keys of different banks g `The type bar frame is formed in two sections on halves, each of which' comprises a lower Horizontal rail 40 and an upper diag onally extending rail 41 having in its upper edge steps 42. The upper and lower rails are connected by means of 'vertical inneran'd outer rails 43 and 44, respectively; and, in order to provide for ease in assembling, the upperA and lower'rails 'are provided with journal recesses 45 and .46, respectively, which recesses, when the parts arel assembled, are covered and inclosed by means of a frame plate or housing 47, of the same shape as the frame section, which is` screwed or otherwise secured to the face thereof. The inner rails of the two frame sections are connected by means of a cross head 48 which has secured vthereto an upwardly extending yoke 49 which carries on its cross head a .type bar guide 50 which is of forwardly opening Vformation comprising rearwardly .converging side arms 51 which converge tomounting for two groups or sets of type bars which are adapted to nest together; f

. is type blocks Will lswing in a horizontal plane; fand ,in view of the fact tliatthe ty 'e carry- Eachof the type bars comprises a vertical rock shaft portion 53, the upper and lower nal sockets 45 and 46, respectively, 'and the intermediate portions of Which are provided' with cranks 54.- The rock shaft portions ofthe ty-pe bars will decrease uniformly from the center toward the end of each group of type hars, as shown in Fig.y 3. Each-of the type bars further comprises a flattened interi mediate portion` 55, which intermediate por-l tions earry, at theireouter ends, vertical type carrier heads 56 very nearly equal in length from end to end of the group, which type carrier heads serve as a mounting for type blocks 57 which carry the usual large and small letters and figures, 4punctuating marks and other characters required in typewrith ino. gradually increasing length from the inner to the outer end ofthe group and extend at differing angles with respectlto the several pivotall points-asbest shown in Fig; l. In

that figure it will benoted'that the innertype bars have their intermediate sections extended back and away' from the printing point, and thatthe outer intermediate type bar sections 'extend forwardlytoward 'theprinting point,v as-compared' With the axes of movement in the twocases, and that the remaining intermediate type bar sections ex- Utend at uniformlyvarying angles between the extremes presented by the innerfaniilv lso far as possible, the distance traveled by eachof'the'type carrying heads in its swing .from normal positionto printing position; 'With the parts in the-position shown, the 1n.

:1 ner headswill -swing through an .are having a 'shorter --radius but much greater angle than the outer heads, although the distance traveled will, of necessity, be somewhat less. All ofjth'e type bars are arranged so that the f ii'ig"xheads are all of' substantial y equal I'engtlLQand,` in vievv of the fact that the i upper ends of the rock shaft portions are of varyi lengths and are arranfed in stepped formanon, it follows that tha intermediate l portions of the type bars must extend diagonally upward from the type bar frame to the pointlo'f connection Aof the ty e carrying =heads.A Furthermorathe fact tat the sec-v :tions of the type bars are flat enablesthem 60, 'opfjjthe intermediate sections brings their @greatest dimension4 in transverse relation with-respect to the plane ,of their type surfaces, .so thatjthe bars are heavily reinforcedl against bending, twisting or vibration when The intermediate Vsections are of` prior construction, type bars were employed, ends of which are journaled Within the your jf the intermediate sections of which extended horizontally, and the type carrying heads of which Were-of varying length andarranged insteppedy formation, but the present arrangement is much superior, in-that itl rei sultsin af much stiii'er and lighter bar, and

at the same time tends to more nearly equal ize the Weight between the inner andouter bars-than was previously possible.

The type barframe is slidably mounted Within vert-icallguideways 58 on the inner faces-of theside Walls of the framework, which permits vertical adjustment of the 'frame,'carrying the entire number of type bars by means of shifting-levers to be hereinafter described. f

The inner arms ofthe key levers are connected vwith respectivetype bars by means of links 59, which links consistI ot'hooked inner and outer sections GOand (il, respectively, connected by means of right-anddeft-thread ed tulnbuckles 62, Wherebyrthe tension of vthe bars can be regulated.' Thel inner sections of the lin-ks' are loosely hookedaronnd'the respectivef cranks, and the outer sections are hooked through holes in the ends of the type lever arms. The links are arranged to pro gressively and forwardly converge toward v'the center of the machine and are arranged in groups of three 1n accordance with the arrangement ofthe keys in three banks. Furthermore, the inner arms Iof the key levers, although arranged'in groups of three, of va.- ryinglengths, gradually increase in length from the sides of theimaehine toward the center, soy that'the inner arm ofthe long center key lever Will be longer than any of the others, aindfwill'engage its link-at the greatest distanceA from the pivotal point ofthe lever. The cranks, instead of lying ^in the same plane, When in norma-l position flie' in uniformly varying planes, asbest shown in' Fig. 4. The outermost crank of eaciigroupfof type bars lies in parallelism with the transverse plane of the machine, While the centermostl crank, when in norm-al position, lies at. an angleabout 515 behindsuch plane, the intermediate cranks being'arranged at varying angles between these two extremes. The result of this arrangement is that, when one of the outermost ke'ys is depressed and its link drawnforward, the initial pull of the4 link Will'be at substantially rightangles to the iee- .iii-

cra-nk; and the outer and heavier type bar.'

which has the greatest length of tratel, will receive an initial pull 4or impulse with the crank. at right angles to the pull andl ifi-the best position to overcome the initial inertia ofthe heavier type bar,l .Toward the end of the s'troke, after the bar has acquired its initial momentum, it is desirable 'to relieve the pull ori-the crankl andthereby diminish the acqi'iiredv momentum of the type bar when the impression is struck. The arrangementl is one which accomplishes this result in view of the fact that toward the end of the stroke the crank will be swung almost to its dead center position, so thwtoward the end of the stroke the pull of the link will be practically eliminated. In thel case of` the innermostJ type bars, which are the lightest and .which have the least movement, itis desirable to startmoregradually and end up with the momentum acquired in order to compensate for the diii'erence in weight in the bars ,and the arrangement is one. which accomplishes these results, in view of the fact that, at the beginning of the stroke, the crankwill lie behind its position of greatest etliciency, which will be reached when the crank is drawn to right angle relation with the link, and the stroke will-end with the crank in a position at a substantial angle tothe link, so that none of the momentum acquired in the earliest stages of the stroke will be lost at the time the blow is struck.

The crank arrangement, together with the variable anOles at which the intermediatesections of the type bars are set, serveinpart to equalize the action of the key mechanism.

Further equalization is secured by the'arrangement of the key lever spring plate 63, which is in the form of a flat plate, screwed or otherwise secured tothe top wall of the framework at a 'point where the lat,- ter is cut away to expose the material mechanism of the machine. The spring plate is provided with a plurality of depending springs 64, which are arranged in groups of three of varying lengths, as best shown in Fig. 5. The'prongs 'of these groups increase in length from the center toward the ends vwhile retaining their group arrangement as regards the length ofthe prongs/composing each individiial group. The prongs are struck down at an angle with respect to the body of the plate, which is held in position by means of a clamping bar 65, andV each of the prongs engages the front edgeof the inner arm of the adjacent k`ey lever. The arrangement is one which brings the I longest inner arm of each group of three levers into engagement with the shortest prong of a group of three prongs on. the spring plate. This yarrangement is maintained from side to side,'the lengths of the individual prongs vcomposing each `group being increased from the center to the sides co-incident with the decrease inthe lengths of the type lever arms from the center toward the sides of thev machine. This spring ari rangement further serves to aid in equalizing the action'of the keys in that the longest arms, which control the movements of the inner, "lighter type bars, will engage the shortest and most rigid spring prongs, and

`the shortest arms, which control the movements of the outer, heavier type bars,t will engage the longest and most resilient spring prongs. This puts a greater spring resistance on the inner type bars, thereby retarding their swing to compensate for their lesser weight and distanceof travel. By arranging the prongs in sets of three, the variant action which, unless otherwise counteracted, would result from the diercnce in length of the three key levers composing a group, is in a measure counteracted, and likewise a heavier spring tension is maintained against the center groups of key levers than against the outer groups of key levers, so that the variation from side to side of the machine will be equalized. As a further means of equalizing the action of all the keys, a stop bar 66 is provided, the for- Vmation of'which is shown in Fig. 7, which raises the stop surfaces of the stops composing the center groups to a higher level than the surfaces of the stops composing the outer groups, whereby the throw of the center keys will be shorter than the throw of the outer keys.' Furthermorefthe group arrangement is desirable in order to per.- mit the vshort key levers, which are struck from a point relatively close to their axes, to have a movement through a greater angle `than the long or lower key levers which are struck from a position at a greater distance from the pivotal point. This arrangement equalizes the length of stroke required to depress any one of a group of three levers'.

` The return movement of the key levers is regulated by means of a rubber covered stop bar (hl-which extends across the machine immediately above the entire set of key bars and holds them iii normal position.

The inner ends of the link sections 60, immediately in front of their point of connection with the cranks', are entered between steadying rods 70, which extend from side to side of the machine and serve to prevent vertical displacement and consequent interference ofthe bars while allowing free longitudinal ,movement In addition to the key lever springs which have been previously described, each of the rock shaft sections of the type bars is provided, at Vits upper end, with a small coil spring'l, as shown in Fig. 3. The function of these springs is to hold the type bars in normal position. If desired, the tension of these springs could be graduated, although such graduationis not necessary where the other means herein described for equalizing the action have been provided.`

Each of the vertiealtype bar heads isprovided l'with an vinwardl proj-ectin pointed printing position, is adapted to*enter the :hole 52 between the arms of the-Vl shaped guidefO, so thatzthe moment the impression .,s --struck the type 'bar head vwill be held rigidly against vibration or sideu play,l being guided to position between the side arms and lheld in position bythe register oi the pin with the guide hole.

The type bar "heads Vare :maintained Iin their normal-or retracted position by means oftype head rests '73 lprovided'with leather buiifersvT/l; which cushionthev type bar'heads as they arethrown back tonormal4 position. The type head rests are held Velevated and 5 rigidly supported byv 4outwardly converging bracesl75,and 7 6, which terminate in a' head 7 7 connected with the-upper lsteppedrail of' the typebarframe near its outer end, the

innerentlFS-o'f the typel head rest being directly connected 1to the upperend 'of 'the -inner vertical frail'of the type barframe.

'The type bars are-screened and' protected by means of shielils`79--of suitable conguration to overlie the entire group oi-type-'barsl when i-n their retractedl position.

The ltype 'bar 'frame `is adapted 'to be thrown either above or below itsnormalcenj ter position, in orderto' bringeither.capitalsv or punctuation marks intogregister with the printing line, by means of --suitable lever mechanism ofthe following character. -In' vieiv of the generally increased printingsurface of capital type, as compared with'ftype `formed to imprint punctuation lmarks or -similarcharacters, it is desirable tohave the capitals formed on the-type bloc-ks in'the lowermo'st position witlr'the small lettersoc-l cupying the centery normal position and the punctuation marks occupying the u lper 'position. This brings lthe capitals c osest-toithe angle at the lower end o'f the typ? barl lhead .and Iclosest to the iguide-pin. This is V the-point yof greatestl rigidity, sot-hat the hardest stroke *will* be registered at this,V

point, whichis desirablein view of the incr ased surface'varea of thecapitalsas -com pared with the' small letters orfpnnctuation marks. The machine is, therefore, arranged to elevate the type barframe when'itis desired to make a shift for-capitals, :and-this `elevation is accomplished by vmeans of an, elevating shift lever -80 which is `pivotedto the'key bar rod 20,-and terminates, at its .forward enda in an upturned button key 8l limrardly projects"from-the side rail 44 of the vertical `movable ytype bar frame, as shown. in `Fig. '3. Whenthe key-81 is de- 4pressedthe'hooked end'82 4of the lever will be-elevated, thereby `causingthe hooked endt-ofride over the pinf83a1id causing the lat-- ter to-swingtward the rear. "This movexi-nentelevates the slotted upper arm 8G of "-tlielever and; liftstlie type bar frame, Awhich lifting-movement is assisted by the action of-'a'pair of coil springs 88, the'lower ends "-ofwhich are securedy to the sides of the type lbarframe,and the upper ends of which are `hooked around the lowermost bar 70. In

order to equalize the movement on oppositev f'pressed,-the inner'end of the lever 89 will e"beeleva-ted away -froni zthe `pin '83, which 'fivilld-allowgraVity to-actland permit the type 'Ibarffrasme=todescend-against the tension of {thelspringsSiS and will-permit the pin 83 ontfheiend 'of 'the Vlowerarm of the bell crank lever 84 to swing outwardly andup- 'Wardly runder the vlever 89. CEach offthe -shiftifng levers is provided with an upwardly extending finger 91,-"a'nd each ofthe fingers lis engagedfby .a forwardly extending coil -sprin-g`92avhioh issecured to a-suitable por- --tionoffthe framework. `"When the depress ing lever is released,fthe spring 92,- acti-ng Aon'ftvh ".tingerill of the lever, will-throw -'dowi1the inner end ofthe lever 89 against theiunderlying pin 83, whichwill be moved 'back to vthe-'normal position shown in Fig. 2, which `movement will -raise the type bar '5frame,assistet by the springs-88,' until it 'has assumed its normal or intermediate position. -FigpjS diagrammatically Vshows the 'elevating-shifty leverin A:full lines, land the depressing 'shift Ilever in dotted lines, the key on each `of the 1 levers being depressed `to*V its )lowermost position;

Inuse,=when any on'eof the keys is depressed,` the linkarinon the key lever will be drawn forward, which'moves the link and exerts a pull onl the crankedportion of the intended! type bar; The nature and extent of llO the pull will be determined'iireach case by the position of 1 thegtype bar itself. \Each ot these factors is to be determined with special nearly equal weight, although it is desirable,

forv obvious reasons, to keep the weight of all the bars at a mmunum and secure the l equalization by the regulation of other factors which determine the character of the stroke. y circle each of the rock shaft sections of the type bars areA intended /to hold the bars -inV normal or retracted position regardless of the action of the spring prongs.

` ln order to shift thetype bar frame vertically, it is desirable that the hooked inner ends of the links encircle the cranks of the type bars, when in normal position, without actually pressing against them in a manner which would impede' the shifting movement of the crank sections up and down through the hooked link ends as'theframe is raised and lowered. If the spring prongs were relied on entirely to hold the bars in position to permit shifting, it -would be necessary4 to adjust the tension of each spring prong with such 'eXtreme ni'cetyIas to beimpracticable in the assembling of themachine. -It is desirable, therefore, that the `return e movement ofthe key levers be limited at such point as to hold the links out ofactual contact with the cranks and rely upon the coil `springs for imparting th slight additional tensionv necessary to ally return 4 the bars to normal vposition. after the cranks have been relieved from engagement with the link hooks. It is not the intention, however,`to limit the invention to the`employnient of coil springs, since the adjustment of the spring prongs might be regulated with sufficient nicety to effect the complete return thereafter. The sprinof y6o feel a light tension, and one which requires movement without the provision of additional springs. The provision of turnbuckles enables the length of each of the links to be perfectly adjusted to act in the manner specified, and after the initial'adjustment of the links at the factory the turnbuckles can v be soldered or'otherwise rigidly secured to the link sections to prevent.,mal-adjustment tension of all of the key levers is regulated bar contro led,'so thatvthe type' bar which requires the most power to actuate it will less 4power will lfeel 'a correspondingly heavier tension. The springs which are secured to the typebar frame counteract in part the action of gravity and assist in rais- The small coil springs which en-v withregard to the amount of owe'r required to throw the type ing the frame, although the weight of thelatter,`c`arrying with it the type bars, will always besufficient to over-balance the tension of the springs, allowing gravity to act when it is desired to lower the frame. If the springs were removed, however, the weight of tlus mechanism would be so reat as to render the shifting movements diflicult and unsatisfactory. A

ln a certain prior construction, the cranked sections of the type bars were located entirely below their journal mountings, but the'present arrangement is much superior, in that the rock shaft sections of the type bars will be journaled and supported on each side of the crank, so that the action of the latter will be more certain, by reasonof therfact that the rock shaft section on the bar will not be subjected to any movement hich, in the older construction, tended to cramp the bar and interfere with its freedom of action. The method of shift ing the type bar frame in either direction is one which causes the frame to move steadily and easily to the desired position; and the arrangement of the type block is one which results in the striking of each set of characters with just -suliicient force to equalize the impressions registered by type of any selected character.

The printing mechanism, as a whole is .extremely compact in character, and the horizontal movement'of the type bars not only eliminates the action of gravity in the forward and return movements, but also reduces the vertical height of the machine, with the result that the complete machine is firm and strong and very ypleasing in appearance.

What I regard asV new and desire to secure by Letters Patent is:

1. ln typewriterA printing mechanism, the

Acor'nbination of a plurality ofV nested type bars, each of thel type bars comprising a type carrying section, a rock shaft section, and an intermediate connecting section, journal mountings for the rock sha ft sections, cranks formed intermediate said journal mountings, the cranks normally lying in variant angular positions with respect to a transY verse vertical plane, and key levers and connections for actuating said cranks, substan- 1tially as described.:

25111 typewriter printingmechanism, the v combina-tion of a plurality of nested type bars, each of the type bars comprising a type carrying section, a rock shaft section, and an intermediate connecting sectiomjournal mountings for the rock shaft sections,

cranks formed `intermediatel said journal mountings, the cranks normally lying in variant angular positions with. respect to a transverse vertical plane, the inner cranks being normally turned more to the rear ofl such plane. than the outer cranks, and key assess '7 form to. impart actuating movements'to the type bars, and connections between thetype bars. and the rear ends of the respective key levers,` engaging the latter at' dierent ver tical distances `from the pivotal centers of thekey levers for equalizing theactionV of 'the keys, substantially'as described.-

4. lin. typewriter printing mechanism, a'

plurality of pivotedl key levers of di'erent lengths, having their 'ends in theiorm of keys arranged in banks, andfhaving at their inner -endsupwardlyextending arms, type bars,and links actuating said. type bars, the links envagingthe' long lever arms being connecte therewith at the greater distances.

from. the pivotal centers, the link connectionsat the center of. the machine tor each bank. of key levers being connected; at greater distances# from the pivotal: centers than the links toward the sides. of the machine-, for

- equalizing the action ot the keys, substantially as described.

5. Intypewriter printing mechanism, a

'plurality of pivotedrkey levers of dierent lengths, having their endsl inthe formv of keys arranged in banks, and. having at their v inner ends upwardly extending arms, type bars,.ad links actuatingsaid@ type bars, the links engaging the long lever arms being connected therewith at the greater distances from the pivotal centers, the link connec tions at the centerof the mach-ine for each bank of key leversv being connected at greater distances from the pivotal centers thanu the links towardthe sides of the machine, for equalizing the action-of the keys, and: springs engaging the arms on said levers, the tene sion of the springs acting uponl the key lei .vers of each bank being Agraduated from the center toward the sides of the machine, for aiding in equalizing the action, substantiallyas described. l

6. In typewriter printing mechanism, a luralitj,T of pivoted lkey levers of different engths, having their ends in the form of keys arranged 1n banks, and having at their inn-er ends upwardly 'extending arms, type bars2 and links actuating said type bars, the

links engaging the long lever arms being connected therewith at the greater distances from the pivotal centers, the link connections at the center ofthe machine for each bank of key levers being connected at greater distances from the pivotal centers than the links toward the sides of the machine, for equalizing the action of the keys, and flat springs engaging the arms of the key levers,

the springs engaging the-center arms of each bank: o''key. levers'being; of less length and greater tension-,than the flat. springs engag-l ing-the of the outer key levers, for aiding in equalizingthe action, .substantially as described.

T. In typewriter printing mechanism, a; plurality of pivoted key levers of different lengths, having their ends in the form of keys arranged in.v banks, and having4 at their inner ends upwardly extending arms, type bars, andl links actuating said type bars, the links engaging the long lever arms being' connected'therewith at the greater distances from the pivotal centers,VV the link connections at the center; of' the` machine for each bank otvkey` leversbeingxconnected at greater distances from the pivotal centers than the links toward the sides of thev machine, for equalizing the actionpol the keys, and a spring, plate provided. with springprongs 'o varying lengths, the' prongs engaging: the

armsV of the center key levers of each ban-k of'keys beingot less length and greater tension= than the prongs engaging the arms of the side key levers of each bank of keys, for aiding; in eq'nalizing the action, i substantially as described. c l Y 8. I-n-'typewriter printing; mechanism, a plurality of type bars pivoted toswing' on vertical axes, a plurality of key levers all pivoted in the same straaght horizontal line and having their forward ends in the form of keys and havingtheir rear inner ends in form to impart actuating movements to-the type bars, and connections between the type bars and therear ends ofv the respectivekey levers, engaging the latter at ldifferent distances'- from the: pivotal centers of the key levers for equalizing the' action: of thekeycs,` the connections for the centenkey leversl engaging the rear ends thereoat eat-er distances fromV the pivotal.- centers or the levers than the connections for the key levers toward the sides oli the machine,. substantially as described'. I

9: In typewriter printingmechanism, the combination of a plurality of key levens, a typeban for each: key lever, connections between each-of the key levers-.and itsttype bar,

the connections engaging thekey levers at suitable points to equalize the action oli the key levers and the throw ofthe type bars, and springs acting upon the key levers and having variant tension for equalizing the action, substantially as described.

10. In typewriter printing mechanism, the combination of a plurality of key levers of different lengths arranged in banks, and a universal bar hung adjacent to the key levers and adapted to be engaved by the key levers of diii'erent banks at dii'ierent distances from the axis of movement of the universal bar. for aiding in equalizing the vmovements of `the universal bar, substantially as described.V

l1. In typewriter printing mechanism, the

combination of a plurality of key levers all pivoted in alinement with one another, the l levers having different degrees of angular i movement, a universalbar hinged adjacent the levers having the greatest degree of levers ha ving lesser degrees of angular movement at points closer to its axis of movement for tending to equalize the movements of the. universal bar, substantially as described.

l2. In typewriter printing mechanism, the combination of a plurality of key levers all pivoted in alinement with one another, the .levers being of different lengths to forni banks'of keys, a universal bar hinged adjacent to the levers and adapted to be engaged by the short levers at points near its free edge, and adaptedto be engaged by the long levers at oints. closer to its axis of movement., the eversbeing provided with upwardly extending arms.,A links engaging the lever arms, the links for the long lever arms being conneetedat greater distances from lthe lever pivotal point than the links engaging the short lever arms, substantially as described. 'I

13. In typewriter-printing mechanism, the combinationof a plurality of key levers of three ditferent lengths and having their forward endsupturned to" provide three banks of keys, means forpivoting all of the key levers in alinement with one another, two groups of type bars, a connection between each key lever and its corresponding type bar, the key levers being formed and the connections being made in a. manner to equalize the key action to compensate for the differences in the weight and swing of the type bars, substantially as described.

14C. In typewriter printing mechanism, the combination of a plurality of key levers of three different lengths and having their for ward ends upturned to provide three banks of keys, means for pivoting all of the key le- A.vers in alinement with one another, two

groups of type bars, a connection between each key lever and its 4corresponding type bar, the key levers being formed and the con bars, Aand variant spring mechanism acting tothe levers and adapted to be engaged by L on the key levers for further equalizing the key action, substantially as described. angular movement at points near its free i edge, and adapted to be engaged by the l5. In typewriter printing mechanism, a plurality of type bars pivoted to swing on verticalaxes, a plurality of key levers all pivoted in the same straight horizontal line and having their forward ends of diterent lengths and upturned to furnish front and rear banks of keys, the rear inner ends of the key levers being in forni to impart actuating movements tol the type bars, and connections between the type bars and the rear j endsof the respective key levers, the connections for the long levers of the front bank of keys engaging the rear inner ends of such levers at greater distances from the pivotal points for the key levers than the connections for the shorter levers furnishing the rear bank of keys, substantially as'doscribed.

16. In typewriter printing mechanism, a plurality of type bars pivoted to swing on vertical axes, a plurality of key levers all pivoted in the saine straight horizontal line and having their forward ends of different lengths and npturned to furnish 'front and rear banks of keys, the rear inner ends of the key levers being in -form to impart actuating movements to the type bars, and connections between the type bars and the rear ends of the respective key levers, the connections for the long levers of the front bank of keys engaging the rear inner ends of such levers at greater distances from the pivotal points for the key levers than the connectionsfor the shorter levers furnishing the rear bank of keys, the connections for the center key levers engaging the rear endsl thereof at greater distances from the pivotal centers than the connections for the kev levers toward the sides of the machine, substantially as described.

RICHARD lV. UHLIG.

Witnesses:

li'lanriiv In'risnsi-iiv, JOHN Davis.

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