US1453628A

US1453628A - Typewriting machine

Info

Publication number: US1453628A
Application number: US601396A
Authority: US
Inventors: Carl W Klauminzer
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-11-16
Filing date: 1922-11-16
Publication date: 1923-05-01
Anticipated expiration: 1940-05-01

Description

May 1', 1923. I 1,453,628

C. W. KLAUMINZER.

TYPEWRITING MACHINE Filed Nov. 16, 1922 3 Sheets-Sheet l A TTORNEYJ.

IN V EN TOR.

May 1, 19723. 1,453,628

' c. w. KLAUMINZER TYPEWRITING MACHINE Filed Nov. 16 1922 3 Sheets-Sheet 2 may E, 1923 c. w. KLAUMINZER TYPEWRITING MACHINE Filed Nov. 16 1922 3 Sheets-Sheet 5 which will operate Patented May 1, 1923..

STE

CARL W. KLAUMINZER. OF LAKEWOOD, OHIO.

TYPEWRITING MACHINE.

Application To all whom it may concern: lie it known that l. (Tani, l l,.\t.\tlr\'Zl 1R, a citizen of the United States. and a residentof Lakewood, county of tuyahoga, and State of Ohio, have invented a new and useful Improvement in Typewriting illachincs. of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle. so as to distinguish it from other inventions.

This invention relates to an improved typewriting mechanism. More particularly it comprises a typewriting machine having but few parts and carrying the printing elements upon a flexible diaphragm. The ap paratus is well adapted for use with a standard keyboard and is preferably provided with but a single operating lever. It IS especially adapted for the use of children. but

may also have peculiar advantages for persons with artificial hands or arms, as wel as 'l'or those of the blind who have ditliculty handling nmlti-key machines.

Simplified typewriting machines have heretofore been p roposet but 111 all such devices. a second or auxiliary lever mechanism has been employed and the main operating lever has been used for pertorming only certain of the operations necessary to producing an imprint. The addition of keys or levers either to secure the printing impression or to move the carriage for letter spacing makes the apparatus more complicated and renders it less suitable for use by children.

The principal object ot my invention is to produce a typewriting machine having a minimum of parts, and which may-be economically manufactured in quantity. it is another object to produce a. typewriter with perfect alinement, imprint, and which will at withstand careless handling. It is a further object of the invention to n'ovide for a single actuating means which tullils' the function of moving the carriage to printing position, bringing the printing character and the paper into contact and shifting the carriage to a new position. Other objects of the invention will appear in the course of the 'l'ollowing description.

an evenness of the same tune To the accon'lplislnnent oi the foregoing andrelated ends. said invention, then. consists of the means hereinafter t'ully.descrtbed and particularly pointed out in the. claims.

filed November 16,

1922. Serial No. 601,396.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention such disclosed means constituting, however, of various llltClttlIllCll forms in which the principle. of the invention may be used.

In said annexed drawing I Fig. l is a top plan view of the typewritmg machine showing Fig. 2 is a perspective view of the printing mechanism; Fi 3 is a top plan view of the machine with the upper portion of the en closing casing removed; Fig. 4 is a transverse sectional ele ation taken axis of the machine; Fig. 5 is a view of the under side of the enclosing casing taken along the line 55 shown in Fig. 4, looking in the direction of the arrows; Fig. 6 1s a rear elevation, partially in section. along the line (i--G shown in Fig. 4, looking in the. direction ot the arrows; Fig. 7 is a detail view ol' the casing latching device, taken along the line T-7 shown in Fig. t; Fig. 8 is an end view of the I spacing mechanism; Fig. 9 is a detail section view of the diaphragm supporting slide, taken along the line 9-9 shown in Fig. 4., looking in the direction of the arrows; and Figs. 10 and 11 of the index pin in the lower case per case. positions, respectively.

As is clearly shown in Figs. 3 and 4 of the drawing, the apparatus comprises a base plate is secured a casing 2 of substantially rectangular outline but having a forward face 3 bowed outwardly at its central portion and provided adjacent its lower edge with an d upbut one the enclosing casing;

along the central "(0 taken 35 platen showing the line so are enlarged detail views as 1 upon the rearward portion of which slot 4: for a purpose which will presently appear. The forward portion 5 of the base plate is provided with a series of apertures (3 designed to serve as index means for causing the usual printing letters. characters and punctuation marks used in typewriting to be brought into register with the printing aperture of the machine. as will hereinai'ter be described. Spacing apertures 16 are also provided.

\Vhile the use of apertures as index means hasbeenillustrated, it is not intended to limit the positioning mechanism to the par ticular construction shown.

The casing is provided centrally of its upper face 7 with a shallow transverse groove 8 within which the. carriage is adapted-to ride. At a point centrally of the depressed Ila ohannel ay of said groove a printing aperture formed through the top plate of and either side of said printing a sn l opening ll is formed which inl: may be supplied to an i 12,015 canva. webbing or other suit-- .aaterial, positioned adjacent the upper face of the casing and surrounding 1 printing aperture.

arnardly of the said shallow groove an plate 18 is secured to the upper surface casing, its ends 1-: extending slightly id said casing at either side. The upedg'e of said angle plate is adapt- E iariin the slide-way for supporting the d its central portion is provided series serrations 1G spaced apart intimately the width t a printing charorting slide con'iprises l imb r 21 adapted to upstanding edge of the rig its rearward edge vardly turned section teri'nii'iating in .ed rack bar Centrally of the ard face of the supporting slide a lonainst a lug l8 bent rearwardly from Ifift of the upstanding portion angle pl to and form the marginal Secured in ahousing 25 formed at slide is a spring 26 suitably shaped projece'i igs the serrations in of the angle bar at a point centrally slide member.

tiaten 31 comprises a roller of sheet wood, rubber, or other suitable 1112b supported upon a central bar I32, the l of which arejournaled in notches 34 ned in the end members of an elongated rectangular frame 35 oi sheet metal provided with an outwardly beaded marginal portion 36 for strengthening purposes adjaare cent its upper edge. The ends of the bar with linger lfllobs 35?, Small is s 38, in appropriate recesses bci the end ti serve to lock the ends e within 'l- .iil' l'e'dltlk; 'iz ecured to end of the platen is a circular dish 41 havizng a plurality of outstandprojections {212 spaced the usual width for producing single spacing between lines y [a spring pressed dctcnt 4-3 an aperture 442 for the cenand secured to the adjacent end i ame by having its lower end enwithin a strap 45 bent outwardly from the body of elongated rectangular an frame. The free end as of the detent is adapted to engage within the depressions the several pronzctxons upon such s.

.. slot 17 is formed, the ends of which of rearwardly extending ears 51 which are pivotally secured to pins 52, which may be formed from integral projections, at each end of the inverted U-shaped slide-way immediately above the upstanding edge of the angle bar. The rearwardly extending ears are of a length suitable to permit the platen to be rocked forwardly upon said pivots to a position centrally of the shallow groove hereinbefore described. In order to provide for the proper insertion of the paper heneath the platen roll and to provide for the accurate shifting of the paper forcorrect line spacing, a metal shield or paper guide 55 is secured to the rearward edge of said carriage fran'ie by means of a pair of spring supporting-arms 5G. Said paper guide is adapted to extend beneath said platen roll and is provided with a pair of s )aced rollers 57 adjacent its free edge. T ese rollers are mounted on a pin 58 secured to the paper guide and are adapted to hold the paper in firm contact with the platen roll. The shield also serves to locate the printing position of the letter, having an index upon its under side adjacent the printing point. A corresponding index will appear on the front of the carriage frame and an index pointer on the top of the casin This permits accurate locating of points for insertions in typewritten matter.

The keyboard or index plate 61 on the forward extension of the base plate has each of its respective apertures marked for the appropriate printing chavacters and preferably these will be arranged according to the well known universalkeyboard used on standard commercial typewriters. However, the scientific printers cztsc. or the straight alphabetical arrangemntof letters, may be used if desired; and it is likewise possible tosubstitute a diaphragm carrying foreign alphabets and designate the printing apertures accordingly. The index plate has only one index position for each letter of the alphabet. the upper and lower case letters being selected by means of a mechanism presently to be described. The index apcrturcs (l2 are arranged in concentric arcs, the center of which is the pivot point of the single operating lever (33. This lever and its associated mechanism is swung from a point centrally ol the rearward inner face of the casing and comprises a vertical pivot post (it upon which is journaled a rigid frame member 6:) projecting forwardly. The pivot post is preferably supported in cars 6 bent outwardly from a plate 67 adapted to be removably positioned in contact with the rearward inner face of the casing bv means of marginal lugs 71, 72, engagingslots 73, 74, in the top plate of the casing and the rearward edge of the base plate, respectively. Forwardly turned lugs loo hold. the carriage shifting plates, herein after to be described, in operative position. The rigid frame member comprises a vertical web 81 of sheet metal having its inner end wrapped about the pivot post and carries, rigidly secured to its upper edge, a horizontal plate 82 which extends forwardly some distance beyond said vertical web terminating in a forwardly projecting finger 83 adapted to engage a supporting trackway 8 formed on the inner front wall of he casing. The horizontal plate has secured thereto, at a point adjacent its mid length, a transverse pivot pin 85 over the ends of which a bifurcated sheet metal lever member 86 is adapted to be positioned. This lever may be stamped out of a single sheet of metal and is suitably shaped so that at its inner section it terminates in an upwardly extending knob 87 adapted to bear against the crosswise extending plate of the operating mechanism presently to be described, while at its forward portion it extends beneath the horizontal plate and terminates in a U-shaped member or stirrup 88 having a central transverse rib 89, which is adapted to ride into a shallowtransverse notch 91 upon the pivot section of the printing lever presently to be described, and to thereby cause a delayed action and sudden change of position of said bifurcated lever and its associated part-s.

The horizontal plate 82 is adapted to support upon its forward section the diaphragm holding frame 92 which is adapted to be slidingly engaged thereover. Pivotally secured to the vertical web member adjacent the pivot post is the operating or printing lever proper 63 heretofore referred to. This lever comprises a forward section 93 and a rearward section 94:, the rearward section being preferably formed as a sleeve to receive telescopically the rearward portion of the forward member. At its rearward edge the rearward portion of the lever is provided with a pair of cars 96 adapted to engage upon either side of the vertical web member 81, already cescribed, over a pivot pin 97 extending therethrough. The forward section of the lever is of a length to project a short distance beyond the front face of the casing through the slot 4, heretofore mentioned, and-may be drawn outwardly therethrough an adequate distance to permit the index point carried at its outer end freely LO engage 'the various printing apertures in the forward section of the The diaphragm 101 is preferably formed of flexible sheet rubber, although leather, light canvas, thin sheet metal, or any other suitable material, may be used. The diaphragm, when formed of material requiring circumferential support, may be fastened at its marginal edges to a rod forming a loop 102 of approximately elliptical outline. Upon the upper side of the diaphragm rubber type elements 103 of shallow depth are positioned. \Vhere the diaphragm is formed of flexible sheet rubber, as illustrated, the printing characters may be molded integrally therewith and the marginal edges of the diaphragm may be molded'about the supporting rod. p

The ends 104 of the diaphragm supporting rod are bent at right angles to tlrplane of the diaphragm and rigidly secured to an upright member 105 upon the diaphragm supporting frame 92 by means of a supportingtongue 106 and a loop 107 struck out of said member and crimped upon the ends oi. the rod. As shown in Fig. 9. the diaphragm supporting frame has a horizontal base tion 108, forming a supporting slide for adjustable engagement with the forward end of the horizontal plate 82, as has already been indicated. This horizontal base section is provided centrally of its under side with a downwardly projecting finger 109, which is adapted to slidingly engage an aperture 111 formed in the forward section of the operating lever adjacent its midlength. Thus the finger permits the downward movement of the operating lever without any shifting of the diaphragm, but insures the diaphragm moving horizontally as the operating lever is shifted back and forth. The diaphragm of course readily moves from side to side as the main supporting frame is turnedin one direction or the other.

Above the operating lever mechanism a hammer lever 115 is pivotally mounted in fixed position for vertical movement against the platen and away from the same. The hammer lever is preferably provided with a pair of rearwardly extending arms 116 spaced apart soas to provide a pivot free from liability to lateral displacement. The pivot ends of the hammer lever are ,preferably supported on a pair of forwardly extending ears 117 formed upon the plate which supports the pivot postfor the oper ating lever. The ears are provided with V- shaped notches 118 within which the rearward edges of the respective hammer arms are adapted to engage. vThe pivo s thus are virtually knife-edge. pivots and the V shaped notches serve to limit the movement of the hammer in each direction. At the point where the rearward arms of the hammer are joined to the main stem thereof, a point of attachment 121 is formed for a coiled spring 122, the operation of which will be hereinafter described.

Pivoted to one of the ears rearwardlv, of the hammer mechanism is a cross-wise positioned plate 123 carrying centrallv of its under side a depression 124 adapted to seat upon the knob-like projection 87 of the bifurcated lever heretofore described, Said plate has at its forward end a finger 125 adapted to engage a cam slide-way upon .the carriage shitting mechanism presently of the supporting plate.

to be described. The cross-wise positioned plate is provided at its forward edge with a point of attachment 1% for the coiled spring connected with the hammer lever heretofore mentioned and on its under side is provided with a downwardly stamped hook 127, adapted to form a point of attachment for a vertically positioned coiled spring 128, the other end of which is secured to an outwardly pressed hook-shaped member 129 formed adjacent the lower edge The last named coiled spring serves to hold the cross-wise plate in contact with the knob of the bifurcated lever. \Vhen thus positioned the crosswise plate serves to hold the inner end of the coiled hammer spring at a point'below the axis of the hammer pivot. Upon depression of the operating lever the knob on the bifurcated lever will be raised, its action being delayed by the rib entering the notch, as heretofore described, and will move the cross-Wise plate to its most elevated position, during which movement the rear-' ward end of the coiled hammer spring will be moved past dead center to a position above the axis of the hammer pivot. As the rearward end of the spring passes dead center, the hammer will be snapped upwardly against the diaphragm and will cause the printing character positioned beneath the printing aperture to be thrust against the paper andmake the desired imprint there- 'on. Upon the release of the operating lever the parts will immediately return to their original positions.

The mechanism for shifting the carriage comprises a pair of sheet metal plates pivotally and slidably mounted upon the inner upper face of the casing, as is clearly shown in Figs. 5' and 6. The centrally positioned plateg131 is provided with an upwardly projecting finger 132 adapted to be brought into (OllllilOl) with a tooth on the rack secured to the carriage, and 'to be shifted laterally thereafter. This plate is provided with a slot 133 by means of which it is pivoted loosely at its rearward endupon a pivot point 130 secured to'the under side of the casing and is provided adjacent its central portion with a spring finger 134 adapted to ride against pivoted upon a stud 137 projecting downthe surface of the actuatin to be described. Forwardly of said finger a downwardly projecting lug 135 is formed in a position to slidingly engage acam notvlrformed in the operating plate.

The operating plate 136 is likewise loosely wardly from the inner face of the casing. It is of hell crank form, the pivot point being at one of its ends. Adjacent its central portion said bell crank lever carriesthe plate presently I cam notch or track 138 for engaging the downwardly projecting lug upon the carriage shifting plate heretofore referred to. Adjacent its other end said bell crank lever is formed with a pair of downwardly projecting fingers forming a cam slideovay 139. This cam slide-way is adapted to be engaged by the finger extension upon the cross-wise lever heretofore described. Thus upon the elevation of the cross-wise lever in the nzan ner heretofore mentioned, the bell crank plate will be rocked about its pivot and brought into position to actuate the carriage shifting plate, moving the same first for wardly' to bring its rack-engaging finger into contact with the rack upon the carriage, and then swinging the same transversely so as to shift the carriage one notch.

At the forward end of the operating lever tion in the holes of the plate, serving to designate-the printing characters. This in dexing pin, as is clearly shown in Figs. 10 and 11, is journaled in the end of the lever but is eccentrically mounted and is provided on its upper end with a. linger piece 142 which may be rotated to move said eccentric pin through an angle of 180 degrees and displace the same horizontally a suliicient distance to bring an adjacent row of printing characters under the printing aperture when said pin is engaged in the. various index holes of the key board. Thus an entirely new set of characters is made available by the simple expedient of turning the finger knob at the forward end of the open ating lever.

The operation of the device has already been partly' indicated but will be summerized briefly to show the exact relation of the several parts.

The single lever carrying the index pin serves to control the selection of the character, the imprinting of the character upon the sheet. of paper, and the shifting or the carriage, and the finger piece at the forward end of the lever serves to select upper or lower case characters as may be desired. At the end of each line the carriage must be moved back to its initial position in the usual manner. It should be noted, however, that the carriage is free to be moved in either direction at all times, exceptoluring a portion of therdownward stroke of the oper ating lever. ria e is of particular advantage for younger chi dren, for whom a carria e release would present an insurmountable illiculty.

' When the a propriate letter aperture is selected upon the key board and the pin in th proper position for upper or lower case 't pc is depressed through such opening, the

nd of the spring actuating the hammer will be moved past dead center with the dele yed action heretofore explained and will thus m suddently trip the hammer and cause it to be snapped against the under side of the flexible type diaphragm. The selected type thus will be brought successively into direct contact with the paper and by virtue of their upper-surfaces having been brushed across the adjacent ink pads, a clear imprint of the character will be impressed upon the paper. In view of the characters being permanently secured in mathematically correct positions upon the type diaphragm, pert'ect alinement will be constantly maintained.

In the form of device illustrated and described, the shifting of the carriage is arranged to take place just prior to the impression of the type character upon the paper, although it is obvious that such shifting may occur after such impression has been made, should such action become desirable. This shifting of the carriage transversely one letter space is brought about through the finger pin on the plate carrying the end of the hammer operating spring, actuating the bell crank plate of the carriage shifting mechanism which, in turn, moves the carriage shifting plate forwardly and engages the projecting finger carried on said plate with a tooth of the rack bar of the carriage.

The spacing of the lines is accomplished by turning the finger knobs one or more spaces, as indicated by the movement of the end of the spring finger'over the projections at the end of the platen roll. By moving the carriage to the extreme right, the end of the longitudinal slot at the rear of the carriage supporting slide abuts the central lug of the angle plate and thus insures a uniform left hand margin. A bell of conventional design may be used to indicate the approach ot' the carriage to the limit of its motion in the opposite direction. By means of the scale provided on the front'ot the rectangular frame and upon the forward edge of the paper guide. the printing point may be readily located for any intermediate point, as when it is desired to make insertions,'or to write matter in indented tabular form, I

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, pro vided the means stated by any of the following claims or the equivalent of such stated means be employed.

, I therefore particularly point out and distinctly claim as my invention 1. In a typewriting machine, the combination of a supporting casing, an intermittently shiitable carriage mounted upon said casing, the top plate of said casing being provided With a printing aperture, ahexible type diaphragm shiftable beneath said aperture, a hammer releasably positioned be .neath said diaphragm, and means for causinga trigger action of said hammer .to produce a sharp impact upon said type diaprinting aperture, an inking pad adjacent said type diaphragm and in thepath of motion of said type characters, and means for causing'the printing of a desired type character.

3. In a typewriting machine, the combination of a supporting casing, an angle bar secured to the top plate of said casing, and having a series of notches upon its upper edge, an intermittently shiftable carriage slidably engaging said anglebar, a spring member on said carriage engaging said notches and yieldingly holding said carriage against motion, a rack secured to said carriage, type selecting and printing mechanism mounted beneath the top plate of said casing, and means supported against the under side of said top plate for engaging said rack and shifting said carriage a single printing space.

4. In a typewriting machine, the combi-. nation of a supporting casing, a carriage mounted upon the top plate of said casing and freely movable transversely thereof, yieldable meanfor centering said carriage inthe successive printing positions, a rack bar associated with said carriage, and means for engaging said rack bar and shifting said carriage a single printing space, said means being supportcd'against the under side of' said top plate.

5. In a typewriting machine, the combination of a supporting frame, type selecting and printing mechanism mopnted beneath said trame, a carriage-supporting bar mounted above said frame, spaced notchesformed on said carriage-supporting bar, a carriage resting upon said bar and freely movable transversely in each direction, a spring pressed member mounted upon said carriage and engaging said notches to center said carriage in successive printing positions, a rack bar associated with said carriage, and means supported against the under side of said top plate for engaging said rack bar and shifting said carriage a single printing space.

6. In a typewriting machine, the combination of a casing, a carriage supported on the top plate of said casing and movable transversely thereof, an impression producing mechanism operated, along a fixed path,

a type diaphragm positioned below the top plate of said casing and above said impression producin mechanism, movable means supporting said diaphragm and adapted to position any part of the same in the path of said impression producing mechanism, and means foractuating said impression producing mechanism.

7. A typewriting machine comprising a supporting, frame, a movable carriage. a plurality of guide elements associated with said frame, a single lever co-operating with said guide elements for causing: the printing of the proper character and the shifting of the carriage, and a finger-piece having an eccentric pin revolubly mounted upon said lever for adapting the same to select upper or lower case characters.

8. A typewriting machine comprising a supporting frame, a movable carriage, a plurality of guide elements arranged n series in concentric rows, said individual guide elements being designated to correspond with the positioning of the upper and lower case characters on the universal typewriting key board, a single lever (re-operating with said guide apertures for causing the printing of the proper character and the shifting of the carriage, and a fingerpiece having an eccentric pin revolubly mounted upon said lever for adaptingthe same to select upper or lower case characters. 1

9. A typewriting machine comprising a, base plate and supportingcasing. amovable carriage mounted above said casin a plurality of guide apertures formed in the forward part of sa id base plate, and a single lever co-operating with said guide apertures for selecting the proper printing character,

' for causing the printing of said character and for shifting of the carriage between the printing of successive characters.

10. In a typewritingmachine the comhi nation of a casing: having a top plate. an intermittently shiftable carriage mounted above said casing the top plate of said as ing being provided with a printing; aperture. a flexible. type diaphragm shii't'able beneath said aperture, a hammer releasably positioned beneath said diaphragm and means for causing said hammer to strike a shar blow against said tvpe diaphragm.

11. n a typewriting mac line the combination of a supporting casing, an intermittently shiftable carriage mounted upon said casing, the top plate of saidcasing being provided with a printing aperture, a fleaible type diaphragm shiftahle beneath said aperture. a hammer releasably positioned beneath said diaphragm, a spring connected at one end to said hammer. and a lever carrying the other end of said spring and adapted to move the sameahove and below the. pivot point; of said hammer to cause sudden the base plate. and hits on the and mounted beneath said t movement of said hammer toward and from said carriage.

12. In a typewriting machine the eorahination of a supporting casing an intermib tentl v shiitable carriage mounted. upon said. casing, the top plate of said casing; hei provided with a printing a erture. a idea ihle type diaphragm shiftab e beneath. aperture, a hammer releasably positioned, be neath said diaphra gm a spring connected at one end to said hammer, a lever carrying the other end of said spring; anti adapted to move the same above and below the pivot, joint of said hammer to cause movement of said hammer toward and awe; from said w ca rriage. and means for retarding the movement of said lever causing acticin when said lever shifts its .osition and a sharp uniform blow from sai hammer ups-n the type diapl'iragrm.

13. In a type/writing machine, the coin-hi nation of a casing, a removable having a portion extending forwardly said casing, a plate for supporting op r ating mechanism of said typewriting chine with the forward port-ion J .l mechanism extending over said extension 30W Sty lower marginal edges of eat? ing suitable apertures in said casingg said base plate whereby mpportin" plate is held in contact with-the reartve inner face of said casing.

H. in a tvpewritiiur machine, "t bination of a casing; remov lite has-L i having a portion eittent r form's said casing. a. carriage mounted said casing, a carriage shifting" a plate for positioning" said shifting, anism and supporting the "print u uisiu of said cvpewriting mac means to lock said suppm'tinp plate the rearward inner face ot said. casi said base plate is attached to said 15. in a typewri'ting: ma hine, biuaiion of a casing. having a an intermittently shiitalnle it ed above said casing. a racl with said carriage a carri; mounted beneath said to associated with said ca; adapted to htf ought said rack bar at times wh, 1 shift said carriage.

16. In a typewriti' hination of a casine intermittently shi above said casing. a raclt hr 1 said carriage, a

a finger projecting threii said top plate for ex and 21V bell crank plate top plate for said carriage shifting plate to move the carriage.

17. In a typewriting machine, the 001m bination of a casing having a top plate, an intermittently shiftable carriage mounted above said casing, a rack bar associated with said carriage, an operating lever for said machine, carriage shifting mechanism supported beneath said top plate, and means actuated by said operating lever for causing said carriage shifting means to contact with said rack bar and move said car riage one printing space.

18. In a typewriting machine, the combination of a casing having a top plate, an intermittently shiftable carriage mounted above said casing, arack bar associated with said carriage, an operating lever for the machine, a pair of movable plates supported upon the under side of said top plate, a finger formedupon one of said plates projecting through an aperture in said top plate and engaging said rack bar, and means con nected with said operating lever for moving said plates to shift said carriage one printing space.

19. In a typewriting machine, the combination of a shiftable carriage, a pivoted hammer lever, a lever positioned crosswise of said hammer lever, connectio s between said cross-wise lever and said hammer lever for actuating said hammer lever, means for moving said cross-wise lever, and means actuated by said cross-wise lever for shifting said carriage.

20. In a typewriting machine the com; bination of a platen roll supported upon an axial rod, a series of projections associated with one end of said platen roll, a platen roll supporting frame of sheet metal bent into rectangular outline and providing journals for said axial rod, a horizontal slot formed in one end of said frame, and a strip of spring metal centrally apertured to receive said axial rod and having one end seated in said slot and the other end resiliently bearing against said projections upon the end of the platen roll.

21. An impression mechanism for a type.- writing machine comprising a pivoted lever, a hammer terminal at the end of said lever,

an operating spring attached at one end to said lever, a second lever pivoted for vert1- cal motion, the other end of said spring be ing attached to said second lever, and means for causing one of the points of attachment of the spring to pass the extension of a line drawn between the pivot of the lever and the other end of the spring.

22. An impression mechanism for a typewriter comprising a (-shaped hammer bar, the two companion ends of which are adapted to form pivot points, a hammer terminal on the other end of said bar, a coiled spring connected centrally with said Y-shaped ear, and means forholding the other end of said. spring and moving the same above and below the axial line ot'said hammer mechanism whereby said hammer is actuated to produce a sharp impact.

23. An impression mechanism for a typewriter comprising a Y-shaped hammer bar, the two companion ends of which are adapted to form pivot points,a hammer terminal on the other end of said bar, a coiled spring connected centrally with said Y-shaped bar, a member pivoted cross-wise of the path of motion of said Y-shaped bar and supporting the other end of said spring, and means for moving said crosswise member to shift the point of attachment of said spring across the axial line'of said Y-shaped bar and produce a sharp impact of said hammer terminalin the direction of motion of said movable spring end.

24:. A type plate for a typewriting machine comprising a supporting rod of substantially elliptical outline, a rubber diaphragm having its marginal edges molded about said rod and printing characters formed upon the upper side thereof.

25. A type plate for chine comprising a flexible diaphragm having printing characters thereon, and a rod serving as a marginal support for said diaphragm, the ends of said rod being bent downwardly and forming a standard for attachment to the operating lever of the typewriter.

Signed by me this 7th day of November,

CARL W. KLAUMINZER.

a tvpewriting me