US1623482A - Typewriting machine - Google Patents

Description

April 5,f1,927 A. G. F. KuRovyKl l TYPEWRITI'NG MAGH'INE Filed July so, 1924 inventan I f. y

6 4 Arror'ne v io Patented' Apu-5, i922?.

ALFRED G. E. KURowsKI, or Bn'conmrn, new YonrnnssrGN-on To Unnnnwoon TYPE- WRITER COMPANY, on New YORK, n. Y., A coRronA'rron on DELAWARE,

i TYPEWRTING MACHINE.

Application led' July 30,

l'li'his invention relates to the cylindrical platens of typewriting machines, which ordi-V made of Isoft rubber, that upon being struck 'by the type-bars it would be apt to yield with or bend bodily, the result that no im pression or a blurred one would be made on the work-sheet, and to overcome the objection due to the flexibility of the soft coreless platen', the constant use of which would tend to warp or distort it and render it in ethcient. These objections are taken care of in the present invention by providing the platen with a support which bears at a point against the platen opposite where the blows are` struclby the type-bars, vsaid support preferably in the form of a metal shield or shoe, thel curvature of which conforms to the curvature' of the platen and extends preferably the whole length thereof. rhe shielfdnniy encompass the plat-en for about one-third of its circumference; Said 'shield may be rigid'lyrsuspended'from the paperengaging' linger-guide-rod of the machine, and, although engaging the eXteriorrof the platen, will permit the platen to' rotate freely. This shield supplies the platen with the necessary rigidity to withstand the blows fronithe type-bars and protects it from be coming bodily distorted. rlLhe corcless body of the suitably soft rubber `platen reduces the noise from the type-bars to a minimum'.

Other features and `advantages will herein-a fter appear.

ln the accompanying drawings,

Figure l is a top plan View ofl a type! writer with the present thereto.

Figure 2 is a side view lookingto the le tt of Figure l, showing how the shield is mounted and engages the platen.

Figure 3 is a .vert-ical sectional view, showing a platen'embodying the present improvements.

invention applied 1924. sentano. "12e-,007.

Referring to Figure l, a platenV 1 is mounted on a shaft 2 journaled in platen-frames 3 and 4:. Ordinarily, the platen l comprisesa core of some hard substance and a covering of hard rubber. By reason of such al construction, the pounding of the typeebars onthe platen makes considerable".noise, which is objectionable. n

naccordancey with the present inyention, the platen l consists of -a tubular body-por.

tion 5 made of semi-soft rubber andan outer 1 covering 6 of somewhat harder rubber; 'v Said body-portion 5 and covering 6 aresecu'red by means of'nails 8 to soft" rubber' end pieces 7 at the ends of the platen. Said end pieces 7 are bored at 9. nto'the bores 9V of the` end pieces 7 are inserted the hubs l0l of bored metal side pla-test1. Sa'id'fsid'e platesV 1l are securely mounted by means of screws 12..

hroughthe' bore-s of the endl pieces 7 and insulated by the rubber end'pieces `7 and is held in place by setsc rew`s rlfhe end pieces 7 maybe made of wood iin some cases. 1 lriounted on the endE ofthe shaft 2 is hand` vwheel 14' for rotating the platen. Entend-V ing'between'the platen-frames 3 and 4 and to the rearv and above the platen l isa rod'y l5. This rod l5 usually'has vhinged and slid-- -ably mounted thereon curved paper-engag-- .75 1 side plates ll passes the shaft 2, which is* press a work-sheet 19 against `the forcing shield 23 to render it lsufficiently J rigid to withstand the blows of the type-bars and to protect it from becoming. distorted.

This shield 23 encircles the platen directly opposite the printing point andE the feedyrol-ls. 'Said shield comprises a curved metal body-portion 24 entendingvth'e length of the l platen I. The curvature of .this bodyepor# tion 2e conforms tol the curvature of the platen 1 and encircles it for about one-third' its circumference. It is rigidly suspended from the rod 15 by means of bored ears 25,l and it frictionally engages the platen l.

It will be noted from Figure 2 that the i.

shield encircles the platenl for about one-A i jv 4@$6 l third.itscireumference, ertending along the' rear and-top sides `of the platen from a point onthe circumferencefof 'the platen below i Y the printingY point thereon, indicated-by vthe type 20to a point "on `the circumference of the platen abovevthe printing point thereon,k directly oppositethe'feecbrolls 21. By posi- V tioning the shield on the platen aty the points agent, imparting sufficient rigidity to the Y' i 1:1 A'noiseless typewriter platen, :includy Ling acoreless body *portion of sufficientlysoft rubber for-i typing, and non-reveluble ymeans exterior of vsaid body portion; and movable laterally therewith, which permits typing on said bodyportion, rendersa Arigid-support toprevent bodily f thefplaten by said typing. Y

sufficiently bending o of z''2.-A noiseless typewriter platen, includi jing aitubular rubber body portion, a rubberV coverngzfor, said body portion, the latter n Y *being softerthan Vsaidcovering, and non-4 `1 revolublelexterior platen-'supporting means Af movable laterally vwith said covering andar- Vthereof. .Y i 3Q VAnoiselessv typewriter platen, Vconsist#V .ingvof Vatubular bodyportion made of seini- A so-ftrubber, a `covering .for said body portion' made ofrubber harder than said vbody portion, and a non-revoliible metal shield in conj V` rangedratfthe y'rear thereof and supporting said platen with sufficient rigidity for typing Von said platen andfto` prevent .bodily bending '1 jl tact Vthroughout withsaid covering and extending the length of said covering and encompassing it.l atf theiprear for substantially f -oneethirdiits circumference', and supporting the platen against bodily bending at the type-p blows.,

[411A noiseless'typewriter platen, including Y La tubular: 'bod-yportionfmade of semi-soft',

vmade ofrubbe'r harde'rftlian said body por-l tion, vand a concave, non-revoluble vmetal Vshield extending the length of said covering .andenc'oinpassing it`` for substantially onethird itscircumference, said shield engaging the covering lightly at the rear throughout rubber, a` coverin,'f:,r|fory said body portion f its lengthto permit Athe platen to? rotate.'

In a typewriting machine, in combination, a noiseles's platen for holdinga worksheet-,said ,platen including a coreless rubber` t bodyyportion anda harder rubber covering therefor, a carriage-rod, feed-rolls mounted v ingon said .work-sheet, and Lmeans mounted oni said rodpositionedl with respect to said vrolls and type and injengagement withthe platen to afford the necessary rigidity yto said platen. to permit typing thereon and to prevent bodilybending thereof from pressure exerted by the blows of the type and by the 6. In a typewriting machine, in combination,a noiseless platen for holding a work'- sheet, said platen consisting ,ofa coreless ron said rod andV arranged for pressingsaidVV Y, 'work-sheetagainst the platen, type for print-Y .feed-rolls, saidmeans being mounted to pery Vmit free lateral adjustment of said feed-rollsv rubber body portion and a sufficiently softff;

rubber covering` therefor, feed-rolls for press-' 'f ing said work-sheet against the platen, a rod mounted'lparallel with said platen, type for printing on said worlr-sheet,-and a metal shield suspended rigidly from* said rod and engaging said platen rfrictionally, saidshield coinprisinga curved body portion extending the length of the platen and encirclingthe sofV rear and top of said platen from a point onV f the circumference of the platen belowthey printing point thereon to apoint on its cir-V ciiinference opposite the feed-rolls, and snp;-

porting the platen against bending bodily lunder the type-blows.v Y

' 7; A noiseless typewriter plateii,including a coreless body portion of. soft rubber siut- *l able forjtyping, noirrevoluble means exterior Y' 95V eially with the same'at the rear'vthereof rto i Y" of'said body portion arranged to move latmake it sufciently rigid for typing thereon vand to prevent bodily bending thereof, and i softrubberiend pieces supporting said body portion.

a tubular rubber body portion, a rubber covering for said body portion, the latter being softer than said covering, non-revoluble and j laterally-movable means arranged at the rear 'c of-said body portion away from the printing Y f line, to makek said platen sufciently rigid Y for typing thereon and to prevent bodily fbending thereof, and soft rubber end pieces Y im 'r' 9. A noiseless typewriter platen, consist#AV ingrof a tubular body portion made of semisupporting rsaid body portion.

soft rubber, a'covering for` said body portion made ofrubber harder than said body por tion, a non-revoluble metal shield in contact Y throughout its length with said covering and extending the length of said covering.' and en'- coinpassing it forsubstantially onethird its f circumference and arranged to permity typing on saidcovering, and soft rubber end pieces supporting said body port-ion, said cof , Y y ieu` 8. A noiselesstypewriter platen, including Y shield supporting said body portion against i bending under the type-blows."

o ALFRED G. r; KURowsKi;

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