US975170A - Type-writing machine. - Google Patents

Description

A. W. SMITH. TYPE WRITING MACHINE.

APPLICATION FILED KAB.. 1B, 1910.

975, 1 70'. Patented Novfa,f1g1o.

. Zw 'www HEATTURNEY manner 'to' the carriage to apply the power lof the spring drum to move the carriage in its ste -by-stcp letter feed movements under contro of the escapenieiit mechanism. The

movement of thecarriage is transmitted' .through the feed rack 17, pinion 20, the shaft 21, spring 34 and pawl and ratchet devices 25 and 27, respectively, to the"`escapement wheel. The pressure of the spring 34"is such that it will be slightly flexed when the pressure of the carriage spring is exerted thereon through the train of connections rcferred to; the spring 34 substantially balancing the power of the carriage spring for purposes which will hereinafter more clearly appear.

i dog rocker 40 is-v provided with two ratchet dogs 41, 42, fixed to the dog rocker and spaced apart-as shown in Fig.. 3to afford a halfand half drop, That is to say, a lia'lf letter space movement of the escapement wheel is afforded on the depression of.a finger 'keyand a half letter' space lmovement of the escapen'ient wheel is afforded on the upstroke of a finger key. The dog .rocker 40 is connected' to or forms part of a rock shaft 43 which'v is mounted at its ends in suitable'bearings on the base of the machine. The rockshaft 43 carries forwardly' extending arms v4-4. which are connected at their forward ends ltoa universal har The universal bar extends transversely beneath the key levers 46, an adjustable leather faced stop 47 limiting the dog. rocker in its return movement.. 'Aspring 48 is connected at one end, as at 49, to the dogrocker andl at its opposite end to a plate 50 secured to the frame of the machine. This spring is effectiveto restore the dog rocker to the `normal position shown in Fig. 1 when pressure .is released. onthe finger keys 51 of the'printing key levers oron the space bar 52 which is operative to atuate the universal bag,Y through levers correrponding tothe l'ii'inting key lever. The pri-"ting key levers and levers-53 for the ,space key aire all pivoted on 'i pivot rod 54 connected toanauxiliary frame.

. 55 detzfchablylsecured in the main franie of the machine. lipwardly extending links 5G are pivoted at their lower ends lo the key .levers 'l-G and at their' upper ends to forwardly extending 'arms of angular sub-levers pivoted- :it 71H to hangers 59.- .The hangers 59 are detachahly-secured to a segment 6() which forms part of the auxiliary-frame. Rearwardly r cxteinlinglr pull links (S1 project upwardly and rearwardly from the upright arms of the angular levers 57 and are connected at their rear ends with drivers 62 pivoted at G3 to hangers 64. Each driver is pivoted at G5 to a type bar proper (36 pivote-tl at its foi.'- ward end, as at (57, to a guide link Q8. fflie various guide links are radially disposed and work `in guide -slots G9, the links being pivoted on a pivot rod 70. The rear end ofeach type bar irop-er GG carries a type block 71, the faces o the type normally resting on an ink pad 72. At the depression of a printing key 51 the corresponding 'type bar is moved to the printing position, the type on the bar following a path indicated by the dotted line in Fig. 1 and striking upwardly and rearwardly against the front'face of the platen 14.

The entire construction described is the saine, or substantially the same, as thateinployed in the Yost visible machine except that in the Yost machine the spring 34- and the sleeve 36 are dispensed with and the sleeve30 is flxedly conii'ectedto Ithe shaft- 21 by set screws. Itfollows therefore that in the ordinary Yost machine there isf a rigid o r non-resilient connection between the carriage and the escapement wheel, in the the escapeineiit wheel. By providingl a spring such as the spring 34, which. 'substaiitially balances thepower of the car- -v ringe spring, and interposing this sprin between the carriage and the escapement w eel, I am enabled to provide a resilient connection or cushion between ,the carriage and the escapeinent wheel which absorbs the shock `or energy of the carriage in its step-by-step let- -ter space movements and prevents the`transmission o'f the shock to the escapeinent de-' vices proper, thus greatly reduci-iig orentirely eradicating the noise ordinarily .p roduced by the drop of thel yescapement wheel and the corresponding drop or let-oft' of the carriage at eachv step-by-step letter'- feed'inoi'ement of the carria e. In the operation of the devices the' epression vof a Hf'iger ke fil is' effective to move the uni- ,fersal bar 1.3 A lowin thus' carryi'nr the feed Hog 41 out. of epg'agelnent with the tooth a of the escapeini'e'nt wheel (see Fig. 1)' and carrying tlie'feed dog 42- iuto the path ofthe sanitfrioth'of the escapeinent wheel,'thi.`is affording-a half drop or half letter space movement of the carriage at the. depression of a'linger key. As the carriage' moves the half letter space Vmovement is transmitted from the feed rack 17 through the pinion 20- and shaft. 21to the spring 34 and Imotionis transmitted through this s ring 34, andthrough thepawl and rate et mechanism operatively -connected therewith, tothe e'scapenient wheel. The spring 34, however, absorbs the shock of suddenly arresting the lso "carriage and enables an .actuation of the "cs cnpement to be ctt'cctcd in substantially a noiselcss n'i:\n1ier. As pressure on the, linger key 5l is released `the spring-t8, is effective lo *'rcstore the dog rocker to normal position. thus moving the ,feed dog 42 down ont.l of engagement with the engaged tooth L of the escapemcnt wheel and interposing, the .iecd dog' Ll. in the path ot the oncoming tooth I) of the escapemcnt wheel, thereby affording` a thali drop cit-the escapement wheel to Complete the letter space movement. While I have shown -my invention embodied in" a typewriting machine to which the invention isy readily `adapted without modifying the structural features of said machine, it should be understood that the. invention may be readily embodied in various styles of typewriting machines irrespective of the general character of the escapement mechanism. employed. Thus, for instance, it isimmaterial for the purpose of the presentinvention what character of feed dogs are employed in connection with the escapement wheel, the invention being applicable with the same degree of efficiency to constructions in which different styles of feed dogs are employed.

The present invention contemplates broadly the embodiment of a cushion onresilient means between the carriage and the escapement devices to absorb the shock incidental to the letter space movements of the carriage; and various changes, therefore,

may be made. Without departing from the spirit of my invention.

It will be observed that the devices ofA m f invention are simple in construction and e ticient in use and that the invention .may he readily embodied in existing forms' ot'typewriting' machines without changing, lormaterially changing, the constructions embodied therein. In short, the simple addition of the spring4 34 and a `looseningr of the sleeve. 30 on the shaft 21 is all that is required to embody the invention in the present construction of 4Yost visible machines.

iVhat I lclaim as newanddesire to secure by Letters Patent, is j,

l. In a typewriting machine, the combination of --1f; ower`driven carriage, an escapement rack, escapement vmeansA cooperative with said rack, and a spring 'constituting an o]:ierativc connection between said carriage movement from one to the other;

2. In a typewritmg machine, the combination of a power driven carriage, ancscapcwith said esca pement wheel to afford a stepby-step toed movement of the carriage,

means for communicating movci'nent from and escapement rack 'and communicating' ment wheel, cscapement means cooilierative" communicated to the escapement. wheel and which absorbs the shock incidental to each slep-by-step movement of thecarriage.

ln a type'writing machine, the combination ot.' a power driven carriage, escapement devices therefor, and resilient means which operatively and resilien'tly connects certain of said escapement devices to move lin unison with the carriage in its letter feedI movements.

4. In a typewriting machine, the combination of a power driven carriage, escapemcnt devices therefor, pawtand ratchet mechanism between certain of said escapement devices and the carriage and which operatively connects the two to move in unison during letter -I'eed movements, and a spring' for resiliently connecting the pawl to the part. which controls it.

5. In a typen-'riting machine, the combination ot al power driven carriage, a feed rack carried thereby, alteed pinion with' which said rack meshes,Y an escapement wheel, escapement means which cooperate with said cseapement wheel, and i'nterihedii ate connections between said.v feed v pinion and escapement wheel, said intern'iediate connections including a ,spring throu h which motion is communicated from t. e feed pinionto vthe escapement wheel.

I6. In a typewriting machine, the combi-` nation of a power drivenearriage, a feed rack carried thereby, a feed pinion "with which said rackI meshes, a shaft. carrying said pinion, an escapeinentwheel, a spring between said shaft and the escapement wheel and through which motion is communicated from onev to the other, and escapementmeans cooperative with said escape-ment wheel. ,i 7. In a typewritingl machine, the combination of a power driven carriage, a feed rack' darrie'd thereby,` a 1icedl pinion with which said. rack ineshes, a' 'shaft carrying f said piniolnlan cscapemeut wheel, pawl and ,ratchet means betwceii said shaft and esmpement wheel, a. spring connected 'at one end to said shaft and' at the other end to f one ot the 'pawl and ratchet. members and. through which movement is transmitted. from the shaft to theescapement wheel.

l8. -In atypewritingr machine, the combination of a power .driven carriage, escapement devices for said carriage, and a spring between the carriage and the escapement devices and through which movementis 120 transmitted from the carriage to cert-ain of said cscapement devices, said spring;` substantially balancing the power einployed .to move the carriage.

9. In a typewriting machine, thc- 'combi- 125` power employed to move the carriage, means .move the carriage and whereby the power employed to move the carriage is transmitted to the 'escapement wheel through said spring, and en escape ment device which eoperutes with said es- `cupemenl'. wheel.

feed n'iovement of the carriage,

ment devices therefor, and a cushion which resists the movementof the carriage in the direction of its feed under the power employed to move the carriage vand absorbs the energy of the carriage et each St'epbystep letter feed movement thereof, said cushion being arranged between the carriage and said esca lement devices.

Signed at tlie borough of Manhattamcity of New York, in the count of New York and State of New York, t is 17th day oit March A. D. 1910.

ARTHUR W. SMITH.

Witnesses CHARLES E. SMITH, M. F. HANNWEBER.

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