US2340491A - Typewriting machine - Google Patents

Description

Feb. 1, 1944. w. 'r. SAGNER 2,340,491

JIYPEWRITING MACHINE Filed April 8, 1.942 2 Sheets-Sheet l INVENTOR aATTORNEY Feb. 1', 1944.' w, T, SAGNER 2,340,491

TYPEWRITING MACHINE Filed April 8, 1942 2 Sheets-Sheet 2 BY v f ATTORNEY Patented Feb. 1, 1944 UNITED STATES PATENT TYPEWRITING'MACHINE Walter T. Sa'gner, West Hartford, 0mm; fassignor to Underwood Elliott Fisher qcmpam New York, N. Y.,* aycorporation of Delaware Appucatiommrirs, 1942; serial No. 43851 19 8'Claims. (oi. 197-64) 'Thisinventionrlates toiypewntme and other mice machinshav'ing carriagemnd withirfjgnid to certain more specific featiii'es'thereof to tbl'iciting speed controls 'for the carriages of Such machines, and also to devices in such machines or suppressing or checking rebounding of 'the carriages when such are intercepted incident to taJbuIating.

One of the objects of the invention is to provide I H10 or suppressing device which is self-releasing after the tendency .of the carriage to rebound-hes silbsided.

Another object of the-invention is torep'rovide a device of economicmaniifacture, whichby application of iri'ctionelire'sistance supiireis'ses rebounding'of the carriaQeQthus avoiding objectionable shock and noise;

It is also an object of the invention to provide a. device whichis built' in alccoi'd withanylo'n'e or more of the above-noted" objects and which edditionally and in an efiicient" and reliable manner controls the speed of the carriage during tabulating runs'thereof H v With these and other object in view, the invention includes'certain novel features of construction and combination .of elements, the elements of which are setforth in the appended claims, andal preferred form or embodiment of which is hereina'iiter describd with refer nce to the drawings which accompany and'fornd part of ithisispecificetion. V

In the drawings:

Figure 1 es idelevltiori of a typewriting" machine embodying the present invention,

. Figure 2 is a. sectional plan view'of a carriage escapement mechanism, in association with fthe novel carriage-speed governor and repentachecking device, the section being taken along ne. Q Ewe- Figure- 3 isva. perspective view showing'lcertcin designated by the numeral 12.

II5i8gf of the combined overnor and grebonndecking device separated alon a main axis hereof,

Figure '4 is a fractional side e evation; of the combined c rr age-spew overnor an reboundchecking'device inc fcondition governing the tailoulating speed of'the carriage v fFigure 5 is a view siniilar 'to Figurje 4, but the device of the'invention is ShQWfiil'l'Cdl'lditiOh to "check reboundingofithe'carriage; v

Eigi re 6 is a frcctionl pers'pective view of an d pe end of a tebm sstor reed, in *as's'ociatioii' with a-guideiplate therefor,

l ned-+1 'of Figur '5,"i11iistratin brake shces in rebound-checking engagement with a '-'brike Directing attention now baiticularly to Figure 1,2, carriage I I is ad'ai'btd 'tdtr'avel in Ie'tte'r feed and return directions upon a, frame generally The frame em bodies a'; transverse traekwa which guides a rail M constituting part of the carna e H there being antifrictior'ielements 1-5 interposed between the tl alckway and the rail. Each l aferal end of the rail 14 eerriesen' upright damage end trolled by an esc designated by the uniern zt.

l '6,"a;ridupon these ends is rotetably carried a conventional 5 paper-supportin platen H. A spring motor l8 snpfiortdon' the name 12 11313 a strap connection 2 Fwith the carriage, bym'eans oi vvhich it "is ceiable "to "move said carnage in letter-feed dire V I n, fio I'eftto'right. Movemerit of the carriegfih wever, s normany cc 'h apeiiient mechanism genera-11y The escapeinent mechanism "comprises fa. holding dog 25*5116 a,

stepping dog 2-6, both-carried onerockeriiivvh'ch is -1q'iv0ted on an axis 2 1 provided on a fr; esupported bracketsti'ncture'zfi n 40" infFigu'res l and g2, the holding As may be: seen dog; 25 is hed eseepemem I I s e ed-afghan carrying at its r pper end a, pinion 3'1 meshing :Withe; rack-:32f'carifiied; by'the carriage; It will bese'en thatthe holding cog; through said escape. e w eeifizran a the parts 2s; 31 than, incrany in eng' etgeinent with e, toot *n ali'y "hold "the carriage against a'dvaince ni'o'v'ernentby thespr ng motor Hi. There; er 3'jis yibrat udn responsefto each typing driers ition and each word spacing operation, in a; jvman 'n er weliknowmbu not snown',.the escapementwneei be a ifetteiigfee :sjtjim e aav,

the reed 35 with a slot 44. depression of the tabulator key 4|, the carriage therefore, has normally no control over the carriage. The upper end of the tabulator reed, as seen in Figure 6, is guided in a slot 36- providedin a horizontally disposed plate 31, the latter comprising the top of a housing 38 which is carried in a rearwardly extending relationship by the trackway l3 of the machine frame. At the bottom, the reed 35 is articulated to the rear .end. of a tabulator key lever 4| which ispivoted 'to the frame intermediate its ends and which has a key button 42 in, or in thevicinity of, the keyboard. Operation of the tabulatorlever 4| raises the tabulator reed 35 into intercepting range of the nearest effectively positioned tabulator stop to the right thereof. The extent of rise of the tabulator reed 35 is limited by a rod 43 in;the housing 38, in cooperation with movement limiting abutments afforded by providing Incidental to the is released from the control of the escapement mechanism 22, so that the spring motor 8 is enabledto propel it leftwardly until intercepted by the engagement of one of the tabulator stops 34 with the stop reed 35.

To release the carriage from the control of i the escapement mechanism, for a tabulating run,

the reed 35 operates a lever train comprising a .lever 45 and a lever 46, the latter having apendent arm 41 for swinging the holding dog 25 about its pivot, free of the escapement wheel 21.: In

. Figure 4, the lever 46 is shown actuated with the resultthat the holding dog 25 is no longer in engagement with the escapement wheel 2]. The lever 46 may be pivotally carried on an appendage 48 of the escapement bracket structure 29, whereas thelever 46 may fulcrum on a rod 5| providedinthe housing 38. Springs 52 and '53,

respectively, associated with the lever 45 and the .tabulating reed, a5, maintain :the tabulating mechanism normallyin an ineffective condition.

Inasmuch a-s the tabulating run of the carriage 'may of considerablelength; that is, of some duration, it is desirable that the reed 35, upon operation, be latchedin effective position, thus relieving .the operator of any necessity I H to sustain depression ofthe tabulator key 42. To' this end, the reed 35i (see Figures 1 and 6) is formed wit an ere? at 5 v h n ra the reed, catches over theright edge of the slot 7 36 in theplatei3'l, it being notedthat the spring 52 is'arrang'ed atja'n' angle to swing the reed rightwardly about its point of articulation with the tabulator key lever 4|. Therefore, although theoperator may "release the tabulator key immediately after depression," the tabulator reed 35 remains raised for the duration of thetabulaf'tion run. As the carriage is being intercepted by the engagement of an effectively positioned carriage stop 34 with the tabulator reed 35, the latter is being displaced limitedly in letter-feed direction, sufficiently to permit the reed, 35 to withdraw-downwardly, within the slot 36, clear of'the tabulator stop-providing, however,

that

10 effectively positioned tabulator stops 34, and,

' the escapement wheel.

In order that the carriage may not attain an undesirable speed during tabulating runs, it has --been a common practice to associate retarding r'neanstherewith. Many forms of such means are known. Also known are devices to suppress or check'rebounding of the carriage incidental to being intercepted at the end of tabulating runs, rebounding being highly objectionable in that it is liable to cause the escapementto assume control .over the carriage while thelatteris in a rebounded position. a 7

The present invention embodies, ma single device, reliable .means to controlthe tabulating speed of the carriage and to suppress or check rebounding thereof at the termination of tabulating runs. In the embodiment of the invention illustrated, this device is. in the form of a "centrifugal governor 56, henceforth to be described. A governor. head orrotor 5|,is rotatable upon an arbor 58 .which is fa st uponxan arm 6| pivoted for movementtoward and away from thejescapement wheel shaft 28. There is fastened to revolve concentrically with the rotor 51, a small spiral gear 62 which isnormally out of mesh with a larger spiral gear 63, the latter being fast on and unitarily revolvable with the escapement wheel shaft'28. Upon actuation of the tabulator key 42;the arm 4l of the lever 46, as hereinbefore stated, swings forwardly and disengages the holdingdog 25 from the escapement wheel 'Zl. Simultaneously, the .rotor carrying arm 6| is urged toward the said large gear 63 by the arm 41, through the intermediary of a spring 64. This results in the engagement of the small gear 62 with the large gear 63,-as illustratedin Figure 4. The normal position of the rotor carrying'arm; BI is determined bythe normal position of'the"lever-A6, the spring 64. being effective to draw-the arrn into contact withthe pendent lever arm 41. 'Since operation of the arm 41 also causes the release of, the carriage from the escapementrit-follows that, during the ensuing carriage run, the rotor 5 |"is rotated. The direction of the spiral teeth on the'gears 62 and 63 is such that the small gear 6 2;while being rotated' during tabulating runs', is thrust 'downwardly against the supporting arm 6 I Flyweight "arms 65 are pivotally mounted upon-the rotor "5'! to swing 'by centrifugal force outwardly against a tapered braking drum 66 which is carried concentrically on"the arbor 5B, "the drum having a flanged end 61 providedwith'athreaded socket whereinto a threaded portionof the arbor extends, a lock nut fi8 being-fladapte'd to be drawn up against the flange to c'lamp the drum securely to the arbon, Preferably eachfiyweight arm 65 has imbedded in a groove a friction shoe of a 'suitablematerial, the shoe having a curved brakingface of considerable extent. When the carriage is at rest, the flyweight arms 65 maybe touching; each other: as

at 12, see Figure 2, and consequently the shoes H, are out of braking contact withjjthe-drfum. During tabulations; as the rotor '5l'is being drivfiyweights, the efiectbeing to increase or decrease the effective diameter of theoriimlififand to cause thereby the shoestc engage thenru'm at 'diiferentpointsjfrom thefflyweight fulcrums.

The leverage at which the flyweightamayfact upon the drum is thus changed andfth'e Fre'sult is that the 'tabul'ating speed of the carriage-can be regulated. When the carriage is intercepted "brought to an abrupt stop, but thefrotor 51, by

having soi'n'ebapacity for axial displacement awayrrom thearhi B l, iS momentarily andwed -t'o continue movementby itspowe'r "of momentum along an'upwardlyspiralingpath governed by the teeth of fthus defiectedupwardlyuntil "the friction shoes the spi'ralgear 63. The gearfSTis against the interior of'the drum '66, stee -Figures that, inasmuch as'the "speed of the rotor is faster than'the carriage, "the rotor spirals very "quickly to rebound checkingposition. Furth'er'of'bene- .fit is "the fact that an rebounding movement of the carriagetha't mighto'ccur has a tendency towe'd'ge the flyweightsirito firmer engagement with the tapered'face of thed'ruiny A"'split ring sprung into a circumferential "groov'eon the arbor 58, seeFigu'res 1 and '5, "retains the governor head against removal from the arbor'whn,

the brake drum -66 isi removed. Otherwise, the split ring serves "no function. Preferably, as hereinbefore pointed out, the holding dog 25 automatically assumes control over the carriage at the termination of the tabulating run of the carriage, incidental to a slight leftward displacement of the tabulator reed 35. The spring 53 at such time restores the lever 46 to the normal position seen in Figure 1, thereby effecting a separation of the gear 62 from the gear 63, the carriage being then restored to the control of the escape mechanism. The taper of the drum 66 is such that the flyweights will separate from the drum when the gears become unmeshed, or, at least, upon commencement of the next tabulating run of the carriage, it being remembered that the tendency of the gear 63 is to draw the rotor 57 downwardly during tabulations.

While the invention provides, in a single device, very eflicient means to control the carriage in its tabulating travel, and to check its rebounding, it is to be understood that the device may be built solely to check or prevent rebounding. For example, the friction shoes H may be fixed directly to the rotor 51.

As can be seen in Figure 2, the rotor carrying arm 6| has a stop ear 13 which prevents the gears 62, 63 from being meshed too tightly. Furthermore, in order to give the arm 6| a firm support against fiexure or displacement in the di- 10 It may, therefore, be seen that the invention is --es'p'e'cially advantageouslyapplicable to a machineembodying a series of selectively project- "a' bletabulating counterstops, such as are used, "for example, for decimal tabulating and column- 5 selecting tabulating.

What is'claime'd is: r

1. In a machine of the class described having a carriage, means 'to tabulate the *carriztgegcar 'ri'age-intercepting m'eans, a rotatable spiral gear having "a 'momentum accumulating amass associated therewith and having capacity for :axial movement,means limiting the axial movement of said spiral gear in one directiong-means for Irotating said spiral gear during tabulations, in-

eluding spiral-gear means so cooperative with said spiral gear that during tabulations said spiral'gear is rotated in aipositionthrust-against said limiting-meansysaicl-spiral-gear means vbeing arrested concomitant to the interception of go the carriage, but said'spiral 'gearabeing adapted 'to continue rotation by momentum in f a spiraling path, away from said limiting means,x=by reacting against the arrested spiral-gear means, and means rendered effective by the spiraling movement of said spiral gear to check rebounding of the carriage. i

g 2. In a machine of the class described having a carriage; means to taubuate the carriage, carriage-intercepting means, a rotatable-"spiral :gear

,mhaving a momentum-accumulating mass associated therewith and having capacity for axial movement, means limiting the axial movement of said spiral gear in one direction, means for rotating said spiral'gear during tabulations, including spiral-gear means so cooperative with said spiral gear that during tabulations said spiral gear is rotatedii'n a-positionthrust against said limiting means, said spiral-gear means being arrested concomitant to the interception of the carriage, but said spiral gear being adapted to continue rotation by momentum in a spiraling path, away from said limiting means, by reacting against the arrested spiral-gear means, a brake drum, and means forced into frictional engagement with said brake drum by the rotation of said spiral gear in the said spiraling path.

3. In a machine of the class described having a carriage; means to tabulate the carriage, carflags-intercepting means, a carriage-speed govtatable gear element having capacity for axial movement, means limiting axial movement of said gear element in one direction, and braking means on said gear element adapted to be forced into braking contact with said member by centrifugal action, said braking means being also adapted to be forced into braking contact with said member'by axial displacement of said gear element away from said limiting means, and means being carriage driven during tabulation, to rotate said gear element, the teeth of said gear element and said gear means being designed to cause a deflection of said gear element in response to the interception of the carriage, ax-

78 ially away from said limiting means, the gear ernor comprising, a non-rotative member, a ro- V interception by said stop means,.

governor for controlling the speed of said mov-- element during this deflection beingmoved by I momentum, whereby said braking means in asand gear means. being so formed that said gear will be axially deflected under the power of momentum upon the interception of said gear means, and means responsive to the deflection of said gear means to check rebounding of said wmovable means when intercepted.

5. In a machine of the class described, stop means, meansincluding gear means movable for a centrifugal able means, a gear rotatable by said gear means to drive said governor,-said gear having capacity for deflection normal location, and the teeth of said gear and said gear means being so formed that said gear will be axially deflected under the power of momentum upon the interception of said gear means, said governor being so constructed as to be rendered effective to check rebounding of said movable means responsive to the deflection of said gear.

I 6. In a machine of the class described having a carriage, means conditionable for imparting tabulatingmovement to thecarriage, tabulator stop-means conditionable, to intercept the carriage, momentum-accumulating means comprising a rotatable gear, means comprising gear means for rotating said gear during tabulations,

said gear being normally out of mesh with said gear means, and means operable to condition both said conditionable means and to mesh said gear and said gear means, whereby during the ensuing tabulation said gear is rotated, said gear having capacity for deflection in one axial direction from a normal location and the teeth of said in one axial direction from a gear and said'gear means being so formed that, I

upon the interception of the carriage, the said i gear will be axially'deflected by power of moc mentum, and means responsive to the. deflection of said gear to check rebounding of said carriage.

'7; In a machine of the class described having a carriage, means conditionable for imparting tabulating movement to the carriage, tabulator stop-means Tconditionable .to intercept the carriagega centrifugal governor forcontrolling the tabulating speed'of the carriage, including, a rotor and a gear unitarily rotatable with said rotor,

carriage-driven gear means, said gear and gear means being normally out of mesh,and means to condition both said conditionable means and V concomitantly to mesh said gear and gear means, whereby during tabulation said governor, controls the speed 'of'the carriage, said gear and said rotor having capacity for deflection in oneaxial direction from a normal location and the teeth, of said gear and said gear means being so formed that, upon the interception of the carriage, the said gear will be axially deflected by power' of momentum, the said, governor being so constructed as to become effective to check rebounding of the carriage to the said deflection of said gear.

8. In a machine of the class described havin a carriage, means to tabulate the carriage, 'carriage-intercepting means, a conical brake-drum, a rotatable gear, carriage-driven gear means to rotate said gear, a governor head rotatable unitarily with said gear, friction shoe means on said head adapted to be thrown radially into contact with said drum by centrifugal action,

thereby to control the tabulating speed of the carriage, said gear and head having capacity for deflection axially toward the smaller end of said drum, such deflection being adapted to bring the friction shoe means into braking engagement with said drumindependently of centrifugal ac- 7 tion, the teeth ofvsaid gear and gear means being of such form that, upon interception of the carriage, said gear becomes automatically deflected axially toward the smaller end of the drum,

thereby to check rebounding of the carriage.

' WALTER T. SAGNER.

CERTIFICATE OF CORRECTION. Patent No. 2,5l o,L 91. February 1, 191m.

WALTER T. SAGN ER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, sec- 0nd column, line 37, claim 2, for "taubuate" read --tabulate-; page i}, first column, ine 11;, claim 1;, and line '28, claim 5, strike out the word "the"; and second column, line 26, claim'7, after "carriage" insert -responsive--; and that the said Letters Patent should be read with this correcti on therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of April, A. D. 19%.

Leslie Frazer (Sea-l) Acting Commissioner of Patents.

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