US760719A - Type-writing machine. - Google Patents

Description

ArPLIoATIoN FILED snr'r. 2e. 19.00. Mmmm un. 1a, 1904. 4

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No. 760,719. l PATENTBD MAY 24, 1904.

` y o. E. YETMAN.

y .TYPE WRITING` MACHINE.

VAPILIGATION FILED SEPT. 28. 1900. RBNEWBD MAB, 18, 1904.

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*PATENTE-D MAY A24, 1904. (LxB. YBTMAN. V yTYPE WRITlNGMAGHINB. APPLICATION FILED BEPT. 26. 1900. RENEWED MAB.. '18, 1904.

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PATBNTED-MAY 24, 1904'.

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No. 760,719.- PATENTED MAY 24,1904. c. E. YETM'AN.

TIPI: WRITING MACHINE. APPLICATION FILED SEPT. 26. 1900. RBIEWED MAR. 18, 1904.

N. 750,719.' l 'PATBNTBD.MAY 24,1904. G. E. IYBTMAN. l TYPE WRITING MACHINE.

APPLI'OAT'ION ILBD SEPT. 26.1900. BENEWED MAR. 1a, 1904.'

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- PATBNTED MAY 24, 1904.

l c. E. YETMAN. ,TYPE WRITING MACHINE. .APPLICATION FILED SEPT. 26. 1.900. REXEWED MAB. 18, 1904.

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G. E. YETMAN.

TYPE WRLTINGMACHINB.

APPLIOATION FILED $2220.20. 1000. RBNWED' MAB. 1a', 1004.

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L illlll' n" @mam/Q No. 700,719.. "PATENTED, MAY 24, 1004.v

- 0. E. YETMAN.

TYPE WRITING MAGHINE.

, n PLIoATIoN FILED SEPT. z 0. 1000.EENEWEDMEE.- 1s, 1904. N0 MODEL, 13 SHEETS-SHEET 10.

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PATENTBD MAY 24, 1904.'

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TYPE WRITING MACHINE. .ArPLIoATIoH FILED sIrr'I. 2e. 1960.. Brunn nu. 18,1904.

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. No. 760,719. I PATBNTED MAY 24, I9o4.-

c. E.. YBTMAN. I TYPE WRITING MACHINE. PPLIOATION FILED SBPTI-'. 1900.l RENEWIAID HAR. 18, -1904.

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j No. 760,719.

" UNITED STATES Patented Mey 24., 1904.

PATENT OFFICE.

n v.FLASH COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION. n

srEcIFIoATIoN I fet-ming part ef Letters Patent No. 760,719, dated Mey 2:1, 1904. I Application 'Iileil September 26,1900. Renewed March 18, 1904. v Serial No. 198,835. (No model.)

To a/ZZ whom it may concern,.-

.particularly pointed out inthe- Be it known that I, CHARLES E. YETMAN, a resident of Oakpark, in the county of Cook@ andy State of Illinois, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is afull, clear, and eXact description.

This invention has relationv to that-class of type-writing machines in which the paper to' bel printed upon is supported upon a platen mounted uponv a carriage adapted to moveA transversely with the machine, the movements: of [the carriage being effected through' suit-l able escapement mechanism controlled by the `Irianipulation of thel key-levers whereby the type-bars are operated. In the accompanyingdrawings the invention is shown as applied to that class of type-writing machines now commonly known as visiof even date herewith and bearing Serial Nos.

31,198and 31,200, and I do not wish to be understood as claiming herein theI features specifically claimed in such companion applications..

Figure 1 is a View in elevation ofthe right-v vhand end of the machine.v Fig. 2 is aview in elevation of the left-handend of -themachine Fig. v3 is aview in vertical longitudinal sec- -ti'on"(from front to rear). of themachine.

` 4Fig 4 is a detail view, in horizontal section,i

through the bearing of the carriage-retractinglever-at the right-hand side of the main frame. Fig. 5-is a view in vertical longitudinal section from front to rear through the main frame'of the machine adjacent one side theref, showin g the carriage-'retracting leverl and certain parts connected therewith. Fig. 6

Triage-retraction spring.

y is a detail view, 'in horizontal section, through the mechanism shown at the right hand of Fig. for adjusting the tension of the car- Fig. 7' is a detail front view'of the paper-carriage and parts sustained thereby. Fig. 8 is a detailfront view of one of the journal-brackets for the front presser-rolls of the paper-carriage.

Fig. 9 isa detail back View of one of the paper- I guide ngers and the plate extending upward therefrom. Fig. 10 is a detail back view of the paper-carriage and parts sustained thereby. Fig. 11 isa detail plan View of the papercarriage frame, parts being broken away.

Fig. 12 is a view in vertical' section on line 12 12 of Fig. 7 Fig. 13-is aview in vertical section on line 13 13 ofFig. 7. Fig. 14-is'ja View in vertical section on -line -14 14 of Fig. 18. Fig. 15 is a detail plan view of the escapement ratchet-wheel, the dogs adjacent thereto being .shown in section on line 15 15 of Fig'. 14. Fig. 16 isa detail 'frontview of the escapement mechanism, certain adjacentV parts being shown in vertical section. Fig-17 is a f detail side view of the escapement-dogs, the

shaft wheren the dogs are mounted being shown f in cross-sectlon/ Fig.v 18 1s a plan view-of the carriage-operating mechanism,

parts being'shown in section and the top of thexmain frame being removed. Fig.19 is a view in vertical longitudinal section'(from front-to rear) adjacent the upper-case lever at the left-hand side of the machine, parts being .shown in elevation. Fig. 20 isan enlarged detail side view of theplaten-shifting mechanism,-parts ofthe'main frame, the carriage, andthe platen .being-shown 1n vertlcal cross-section. Fig.'y 21 is a detail front 'View of the platen-locking mechanism, the" adjacent side'fwallf' 0fl the main frame being shown in sectioni" Fig. 22 is a view in central vertical section'k through the parts shown in Fig. 21.

Fig. 23 is a detail viewin vertical cross-section through the crank and shaft shown at theright-hand side of Fig. 22,'a'djacent parts being in elevation. Fig. 24 is a View in vertical section on line 24 24 'of`I`igf2l2fv- Fig. 25 is a view similar to Fig. 24, but-'showing the `parts in different position. Fig. 26 is an end elevation of the paper-carriage and parts sustained thereby.

In the accompanying drawings the invention is shown as embodied in a machine having a main frame or casing eomprisingabase portion A and an upper portion A', upon which latter the carriage is sustained.

The finger-keys B are pivoted at their rear ends to a transverse bar 3 and extend forwardly to the keyboard of the machine. Transverse bar 3 is sustained from a transverse bar 2. The key-levers B are provided with upwardly-extending offsets to which are connected springs 5, `which serve to hold the keylevers in their normal uplifted position. Supplemental uprightV levers C are pivoted at their lower ends, as at c, to the transverse bar 5. The uprights or offsets of the key-levers B have pin-and-slot connections c' with the supplemental levers C. Type-bars D are pivoted to suitable hangers D', which are held in place by a bolt 10 upon a semicircular stepsupport D2. The inner ends of the type-bars D are connected to the supplemental levers C by suitable links. In Fig. 3, for the sake of clearness, only a single type-bar and its operating connections are shown. It will, however, be understood that the type-bars are grouped in semicircular series about the printing-point on platen W in the manner usual with type-writers ofthe visible front-strike type. The arrangement of key-levers, supplemental levers, and type-bars form no part of the present invention, but are fully described and claimed in 'a companion applicatior, Serial No. 31,198, filed of even date herewit i.

Across the front of the machine is a rack A2 fory holding the stenographers note-book, &c. This rack is provided with an upturned lower edged and bent brackets a2, by which it is supported from the top of the machine, being secured thereto by thumb-screws a3. The heights of the parts A and A of the machine are so proportioned that this rack may be located, as shown, directly before the eyes of the operator without obscuring either the keyboard or the printed line, and I believe that I am the first to construct a copy-holder of this sort. Across the top of the upper portion A of the main frame extend the carriagetracks 50 and 51, between which are placed the rails 52 and 53 of the carriage J. The carriage-tracks 50 and 5l and the carriagerails 52 and 53 are provided upon their opposing faces with suitable grooves to receive the antifriction-balls 54, stops being provided to prevent the passage of the balls from out their grooves. The re'ar track 51 of the paper-carriage (see Fig. 14) will be mounted upon the main frame in such manner that it may be adjusted by means of set-screws at its rear in order to compensate for any wear in the bearings; but as this forms no part of the present invention it need not be more particularly described.

The paper-carriage J is preferably formed as a casting, comprising the front and rear walls 52 and 53, the central web j, and arched end plates j and J2, and between the arched end plates the platen W and coperating parts will be sustained. To the under side of the front carriage-rail 52 and extending lengthwise thereof is secured a rack-bar 55, with which engage the teeth of the gear-wheels 56 and 57. These gear-wheels are mounted upon a shaft 58, (see Figs. 3 and 18,) one end of which is shown as journaled in a bracket 59, while the opposite end is journaled in a threaded bearing projecting inwardly from a boss or offset at the back of the main frame. 'Ihe gear-wheel 56 is loose upon the shaft 58; but the gear-wheel 57 is fixed thereto, and to this shaft 58 is also fixed a beveled gear 61, upon the rearwardly-extending hub of which the gear-wheels 56 and 57 are preferably mounted. The beveled gear 61 meshes with the corresponding beveled gear 62, that is fixed to a cross-shaft 63. The cross-shaft 63 has its inner end journaled in the bracket 59, and its opposite end is journaled in a suitable bearing at the right-hand side of the main frame of the machine. A set-nut 64 upon the shaft 58 serves to hold the gear-wheels 56 and 57 in position upon the shaft. On the shaft 63 is fixed a pinion 65, with which engages a segment-rack 66, (see Fig. 5,) that is carried at the inner end of a plate 67, fixed to or formed in piece wi th a rock-shaft 68, that is journaled in the side wall of the main frame. The outer end of the rock-shaft 68 has connected thereto a crank-handle 69, that extends forwardly at the right-hand side of the machine aud within easy reach of the operators hand. The plate 67 is shown as formed with a suitable cam-shaped or curved surface 70,over which passes the carri age tape or cord 71, the inner end of this tape or cord being conveniently fastened, as at 72, to the plate 67 .I The tape or cord 71 passes downward beneath a friction-roll 73 and is connected` to the inner end of a coil-spring 74. The opposite end of this coil-spring 74 is attached to an arm 75, (see Figs. 5 and 6,) the upper end of which is formed with a threaded hole through which passes an ad j usting-serew 76, whereby the arm 75 lnay be moved forwardly or rearwardly in order to adjust the tension of the coil-spring 74. The screw 76 passes through a hole formed in the angular plate 77, that is attached, as by the screws 78, to one side of the main frame, an opening being formed in the front of the main frame to expose the head of the screw 76, so that it may be conveniently adjusted by the operator. It

will thus be seen that by turning the screw 76 the operator can vary the tension that the spring 74 exerts upon the tape 71 and upon The purpose of the hand-lever the carriage.

IOO

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65 characters and render the operation ofthe 69 is to enable the operator` to readilyfshift the carriage in forward or back ward direction,v .A

reference to Figs. 1, 5, and 18 it will be seeny that if the handle 69 be in the position there -shown and the operator depresses the handle -it will rock the shaft 68 and turn upwardly the segment-rack 66, which in turn will impart partial revolution to the pinion and shaft 63 and `throughthe medium of the beveled .gear-wheels 62 and 61will impart partial'revolution to the gear-wheels 56 and 57. Inasmuch as these gear-wheels are in constant engagement with the rack-bar 55, attached to the under side of the carriage, it is manifest that as the handle 69 is thus depressed the movement of the carriage from left to right will be effected, the extent of this movement depending upon` the amount of depression *f given to the handle.

Vlith the loose gear-wheel 56 meshes a pinionv80, that is mounted upon a counter-shaft 81, (see Figs. 1-4, 16, and 18,) lone end .of thisV counter-shaft being journaledin a bracket 59,

bolted to the side wall of the main frame,

fwhile the opposite lend of this shaft 'is` jour-. k naled in a threaded bearing-block 83, that is fastenedl to the inner end of a boss 'or inwardv vextension 84 on the back plate of the main frame. The gear-wheel 8O is connected to or lformed in piece with a sleeve 85, that is loosely: mounted on the shaft 81, one end of. this sleeve being formed with clutch-teeth 86, thatfy .engage corresponding teeth 87, formed upon `the hub of a worm 88, that vis fastened to the,` shaft 81. The clutchteeth 86 and 87 are= forced normally into engagement by a coil- Vspring 89, that' is mounted on the shaft 81,l one end of the spring setting within an annu 'lar recess of the sleeve 85, while the 'opposite en'd ofthespring bears against a washer 90, that is mounted onthe shaft 81.

the escapem'ent-dogs L and L', to be'presen'tly is necessary that the propelling-spring shall befree to exert its pull upon the carriage to takev up thel play or backlash between the lteeth' of the carriage-rack and theteeth of the` escapement-pinion. Y If thel carriage were not so held. it could move loosely backward and yforward on its bearings to the extent of the backlash between the teeth Vof the rack and?y the escapement-pinion. Thismovement would of course affect the spacing of the printed l Between: the washer 90 and a threaded nut 91, also on 4`the shaft 81, is held the escapement-wheel' K, having teeth le, adapted to be engaged by machine defective. In the usual construction the'propelling-spring is directly connected to the carriage; but in the present construction the propelling-spring is connected through the segment 66 and the train of gears 65, 62, 61,

and57 and rack 55. It is, nevertheless, necessary that the propelling-spring should bel able to exert adireetpull upon the paper-carriage. If, for example,.the fixed gear 57 engaged directly with the escapementpinion 80,

pellingspring and .the Aescapement will be:

connected to the carriage by independent geartrains. With this construction it is clear that the propelling-spring is free to exert a pull to hold the carriage toward the left, while the escapement, through the gears 8O and 56, operates to hold the carriage to the right. In other words, the loose gear56v engages the carriage-rack V55 to hold the carriage in position, while the gear 57 isyfree to engage the rack to move the carriage forward and takeV up the backlash between the teeth of the rack andl the teeth of the gear 56-that is to say, the teethofthe rack are locked between'the, teeth of the loose gearwheel 56 and thev teeth of the'tight gear-'wheel 57.

By reference to'Figs. 14 and 18 of the d rawings it will'be seen that the teeth 86'and 87 of the clutch are'so inclined that when the gear..--` wheel 8() is turned in one direction the teeth will interlock-Av and impart revolution to the shaft 81 and to the escapement-wheel K; but when the gear-wheel 8O is turned.` in the opposite direction the inclined 'faces of the teeth 86 will ride over the corresponding inclined. faces of the teeth 87, thespring 89 allowing the sleeve 85 to yield for this purpose.- When l the paper-carriage J ismoved in `backward direction through the medium of the handlever 69, as above described, or in any other manner, the gear-wheel 8O is turned by the gear-wheel'56;v but during thisbackward -movement of the carriage the teeth. 86 ride over theteeth 87 in manner last described without effecting the movement of the shaft 81.` The worm 88v mesheswith the teeth of a lworm-wheel 93 upon the shaft'94, thisl shaft roo and 17,) that is fixed to a short shaft 101, the

inner end of this shaft being journaled in a bracket 102, secured to track 50, while its opposite end is journaled upon a bearing-screw 103, projecting inwardly from one side of the main frame. On one end of the shaft 101 is fixed a stop-arm 103,'adapted to contact with a stop 1081, that projects inwardly in the path of the arm, and thus limits the movement of the shaft 101. The shaft 101 has fixed thereto a collar 104, provided with a crank-arm 105, to which is connected the upper end of a link 106, the slotted lower end of this link (see Fig. 14) being connected 'to the upper arm 107 of the bell-crank that is mounted upon the shaft 108, which extends from side to side of the main frame and is journaled on suitable bearing-screws at its ends. Each end of the shaft 108 has fixed thereto a depending crankarm 109, the crank-arm shown at the lefthand side of the machine being preferably in piece with the hub of the crank-arm 107, and each of the crank-arms 109 are pivotally conneeted. as at 110, with links g3, that lead inwardly from the upwardly-extending portions of the universal bar Gr. The bail or universal bar Gris pivoted to the support for key-levers and extends forwardly, as shown in Fig. 3, beneath such key-levers, is upheld by springs in the manner already described with reference to the key-levers, and is provided with an upwardly-projecting portion, as shown in Fig. 19, which is connected to the crank-arm 104. The escapement dogs L and L' are drawn to their normal position by means of a coil-spring 112, one end of which is connected to the stop-arm 103, while its opposite end vis connected to a threaded rod 113, that passes through the back plate of the main frame and is there provided with an'adjusting thumbnut 114. ln Fig. 15 of the drawings the escapement-dogs L and L are shown in their normal or idle position with respect to the escapement-wheel K. If now the universal bar be rocked, as by the depression of a keylever or of the space-bar, so as to move forwardly the connecting-links g3 in the direction of the arrow, Fig. 14, the dog L will pass Afrom engagement with the pointed end of the adjacent tooth of the escapement-wheel K.

INow inasmuch as the escapement-wheel is connected, through the shaft 81, the gearwheel 80, the gears 56 and 57, the beveled `ge'ars61 and 62, shaft 63, and gear-wheel 65,

with the rack and plate 66 and 67, to which the carriage-retracting tape 71 and spring 74 are attached, it will be seen that there is a Hence when the dog L is swung 101, so as to clear the point of the adjacent tooth r. the escapement-wheel K will turn in the direction of the arrow, Fig. 15, andthe.

tooth will pass through the space between the points of the dogs L and L as the dogs swing in opposite direction upon the release of theuniversal bar. As soon, however, as the universal bar is thus released the dog L is rcstored to the normal position, (seen in Fig. 15,) and as thcadjacent tooth of the escapementwheel has passed between the dogs the ncxtsucceeding tooth of the wheel will be caught by the point of the dog L. Heretofore the dog L has been formed upon one side with a beveled face and upon its opposite side with a face parallel with the plane of movement of the dog, and the teeth 1 of the escapement-wheel have been formed upon one side with beveled faces and upon the opposite side with faces at exactly right angles tothe plane of the wheelthat is to say, in previous constructions the bearing-faces of the dog L and the teeth 1 which are normally in contact at the end of the letter-space movement are arranged parallel to the movement of the dog L, while as in this instance the end of the dog L and the side of the teeth f: which are in engagement with the end of the dog L the teeth 1 pass between the escapement-dogs L and L are beveled or inclined, so that the springs connected to the escapement-dogs will be brought into play to cam or force the members of the escapement rapidly past each other. l have found that with such prior construction when the universal bar was released and a tooth of the escapement-wheel struck the opposing face of the dog L there was a tendency of the wheel to rebound and in so doing to slightly .spring and force laterally the dog L, so as to permit the tooth to pass between the dogs, and thus sometimes fail to promptly arrest the carriage. By reference to Fig. 15 it will be seen that the dog L and teeth 1 have their opposing faces, which are in engagement at the end of the letterspace movement, slightly inclinedthat is to say, the bearing or normally contacting face of the dog L isinclined to the plane of movement of the dog, while the bearing or normally contacting` faces of the teeth /fc are correspondinglyinclined slightly to the plane of movement of the wheel. Hence when the teeth strike the bearing-face of the dog L there is a tendency of the dog and teeth to interlock, so as to prevent the accidental slippingof the dog from engagement with the point of the tooththat is to say, the normally opposing faces of the teeth and the dog L, which are in contact at the end of the letter-space movement, are so inclined that the carriage-propelling` spring, which normally urges the ratchet-wheel K in forward direction, is brought into play to cam or lock the escapement members together at the end of the letter-space movement. In practice l have found thata comparatively slight inclination of the opposing or normally contacting faces of the dogL and of the teeth is very effective `in preventingthe accidental disengagement of IOO . the dog and teeth and consequent skipping of the carriage; and with this construction it also becomes possible to. hold the escapement-` wheel 'by a very slight interlock of its teeth with the dog, and hence the dog will respond more quickly tothe action of the key-levers.

vIt will'thus be observed lthat not only the end of the dog L but its bearing face or side is inclined or beveled to the plane of itsmovethe -pin on the arm 107 engages a slot in the link 106 and is normally positioned centrally inthe slot, so that the dogs are not operated ,until the universal bar has been-'depressed to some extent and are at`rest before the universal bar returns to its normal position. In this way the operation of the escapement is extremely'rapid, while at the same time the vibration of the universal bar after it has been depressed and returned to-normal is not transmitted to the escapement-dogs, so that there is no danger of a double'operationofthe escapernent. Many type-writers have this fault of skipping in thisway, and .I have. used this simple means to-prevent it in thismachine.

Between the end-bars j" and f2 of thecarriage J extends a rocker-plate M, that is pivoted, as at m, to the end bars ofthe carriage and-has its inner edge formedwith the usual notches to receive the adjustable margin-stops, bell, &c. To the rocker-plate M adjacent the left-hand end` is attached a bracketM, having an'angnlar` portion M2', that extends through ay hole ff, formedl in the endplate-.of the` carriage, this angular portion "being furnished ywith a iinger-piece,whereby it may be conveniently manipulated by the'operator. vTo lthe `under side of the rocker-plate Mat itscenter v (see Fig. 14).is connected a depending arm 12.0, that carries at its lower end afriction-.roll 121, adapted to travel in fr'n't of a carriage-release bar .122, thaty extends from side tosideof the 1 l mainframe, "this bar-having downwardlyturned ends 123., that are -pivoted, as at 124, to the sidewalls ofthe main frame. The .lower end offone ofthe arms' 123 of therelease-` bar is extended downwardly considerably below its pivot-point and is bent inwardly-and attached .to a slidingyoke-frame 125, .(see

Fig. 18,) that is mounted in. manner.v free to l sl-ide upon a short shaft 126, -that projects inwardly from a boss or offset 84 at the hack'` of the main frame. Uponvr this shaft-126.is a coil-spring 128, one end' of which engages astop 129'on theshaft, while the other. end of the spring engagesone `end of the yokeframe 125, the spring serving to hold the yokesleeve 85 and bears againstthe gear-wheel 80. `(See Fig. 14.) Hence it will be seen that whenever it is desired to'manually shift the carriage in either directionwithout the oper,- ation of the finger-keys or of the carriage- ,shift lever above described the operator can readily accomplish this by drawing forward lthe finger-piecev at the end ofthe bracket M',

(see Figs. 14 and 20,)'thereby causing the rocker-plate Mto turn about .its pivots and in so doing to cause the arm to engage and force rearwardly the release-bar 122,

which in turnwill cause the yoke-frame to beshifted upon the shaft 126 in such manner as to force .the clutch-teeth 86 from engagementv with the clutch-teeth 87. When the lclutch-teeth are thus disengaged, the car-i ria'ge may be manually shifted iny eitherfdirection without imparting revolution tothe shaft 81-or to the ribbon-feeding mechanism driven therefrom. j

The'platenW (shown in Fig.'20) is mounted .upon-a shaft w, that is journaled in tlie end bars and 136 of the platen-frame, and tothe. shaftl fw are pivotally connected the platen-supportingfarms 137, that are pivoted, as at r138, to the vertical end plates j and f2 of the carriage. By reference to Figs. y'1 and 26j-it will be seen that the'end barsof the platen-,frame areprovided with offsets 139, through which pass set-screws 14,0, the ends of these set-screws being adapted tocontact IOO with lugs j at the top of the end plates of the carriage, s o as to accurately determine the normal position of the platen. The end bars 135 .and 136 of the platen-frame are connected together by rods 142 and 143, that extend above and below the platen. In order to effect the shift of the platen to enable either one of the two types carried i i by each of the type-bars D to be brought to the printing-point, the mechanism next to be described is provided. To the;.ends of-they lower ,front rod 143 of the platen-frame are pivotally connected, as by screws; 147, .the upd per ends of the' crank-arms'148 and 149, that project forwardly-from a rock-shaft 150, that extends-fromend .to end `of the. carriage and -is journaled. at the /basefthereof. (S'eeFig..

20..) Centrally upon this rock-shaft is mount- .ed a depending armv 151, that carries at its lower end a friction-wheel 152,.the periphery of .which is adapted to travel.v along andfin front of a shifter-plate P,..that extendsffrom sideto side of the main frame and is `pivoted thereto, as at 154, l Preferably-the lower pordepending crank-arm p2, and theilowere'nd of this crank-arm pzphas pivotally connected thereto, as at p3, (see Fig. 20,) the rear end of a link 158, the forward end of which link 1 is pivotally lconnected to a crank-arm 159 of ashort shaft 160.

(See Fig. 22.) This shaft 160 is journaled in a bracket a5, bolted to the inner face of the side wall ofthe main frame. Extending outwardly from' the end of the shaft 160 is ashort shaft-161, that extends through the side wall of the main frame, beingjournaled in a suitable bearing therein. Upon the shaft 161 are fixed the crank-arm 162Y and the stop-arm '163, the stop-arm being adapted to contact with the pin 164, whereby the .link 158 is pivoted to the arm 159. (See Figs. 21 and 25.) To the upper end of the crank-arm 162 is pivotally connected, as at 165, the upper arm of a yoke-bar R, the lower armof this bar having connected thereto lone end'eof'a coil-spring R', the opposite end of .which spring is suitably attached to the main frame. The stop-arrn163 isinthe same vertical plane as the yoke-bar R and is adapted to engage therewith when the parts are'in the normal position seen in Fig. 24-that is to say, in the position which-the platen will occupy when lower-case letters `are to be printed. The outer end of the shaft -161 has fixed thereto afthumb-wheel 169, whereby the shaft may .be .manually turned for the purpose to be presently explained. The inner end of the shaft160 has connected thereto a cra-nk-arin :170, the connection between the shaft and crank-arm being effected by means of a p'in 171, that passes through a slot 17 2in the hub of the crank'- arm. (See Fig. 23.) To the lower end of the crank-arm 170 is connected by a pin-and-slot connection the upper end of the vertical arm 173 of the upper-case keylever. By reference more.` particularly to Figs. 2O to 25 of the drawings it will be seen thatwhen the parts are in the normal position shown in Fig.y 2O the tendency of the spring R- is to hold-them in such position. Ifnow, however, it is desired to print upper-case letters, the platen. W must be raised, andto effect this-the yupper-case key-'lever will be depressed in the usual manner. This depression of the upper-case key-lever will rock forwardly the vertical army 173 and cause the crank 170 to turn the' shaft 160 in the direc- -tion ofthe arrow, Fig. 23. As the" shaft 160 is thus turned it will rock forwardly the crank 159, thereby causingl this crank, through the medium of the link 158 and the crank p2, to swingforwardly the shifter-plate P. This forward swing ofthe shifter-plate will through themediuni of the roller 152 and arm 151 rock the shaft 150, thereby Vcausing the arms 1.48 and 149 to lift the platen-frame and platen from the normal or lower-case position to the position at which upper-ease letters'wi'll be printed. Inasmuch as the shaft 160 is disconnected from' the shaft 161 and the crankshaft'161 or its cranks.

arms carried thereby, it is manifest that this movement of the shaft 160 will not affect the lllrhen, however, it is desired, as is often the case, to retain the platen in the upper-case position during the printing of considerable matter, this will be accomplished by the operator turning the thumb-wheel 169 in such manner as to cause the crank- arms 162 and 163 to swing from the normal' position (seen in Fig. 24) to the position shown in Fig. 25 of the drawings. When the shaft 161 is thus turned, the upper end of the crank 162 will swing rearwardly and the crank 163 will swing forwardly, thereby striking the pin 164, and thus drawing forwardly the link 158, so as to cause the platen W to be raised tothe upper-case position', as above described. rlhe rear\vard movement of the crank 162 is suiiicient to bring the yoke R to the position seeny in Fig. 25, and in such position the coil-spring R will exert its force to hold the parts Ain such position, thereby retaining the platen elevated for the printing of upper-case letters. By reason ofthe' pin-and-slot connection (shown in Fig. 23) between the shaft 160 and the crank 170 it will be seen that when the crank 159 is shifted by turning the thumb-wheel 169, as just described, the pin 171 will move along the slot 172 and will not disturb the crank 170 nor the arm 173 of the upper-case keylever. When the platan W is to be restored to'normal position, the operator will reversely turn the thumb-wheel 169, so'as to bring the parts againto the position seen in Fig. 24.

In order to cause the platen W to be shifted from normal to upper-case position by the easy touch of the operator of the upper-case key-lever, I have provided springs for counterbalancingl the weight of the platen and its frame. By reference to Figs. 1 and 26 of the drawings it will be seen that to each end of the carriage J is connected, as at s, a platespring S, that is curved varound the carriage and has its free end bearing against the screwheads 147 at the end of the lower cross-barof the platen-frame. The force of these springs is such as to counterbalance in great measure y vthe weight of the platen and its frame, so that these parts lnay be lifted with but slight clfort by the shifting of the upper-case keylever or by turning the thunib-wheel 169, as hereinbe'fore described.

The lower front bar 143 of the platen-frame isrevoluble in its bearings and is provided at its ends with the usual springs (not shown) thatserve to turn this bar downwardly and inwardly; but as this feature forms no part of the present invention it neednot be more fully described. Upon the front rod 143 (see Fig. 7) and at each side of the collars 1f, that are fixed to the rod 143, are pivotally mounted the yoke-shaped ends of the arms t', that extend rearwardly beneath the platen and (see Figs. 7, v10, 12, and 13) have their upper ends provided lOl.)

with 'ournal-bars t2, whereon are mounted y the presser-rolls T, these Vrolls being held in extends downwardly beneath `and upwardly through openings u, formed in thelower section U of the paper-table. This section U of the paper-table is fixed to the arms u', and it in frontof lthe platen W, as clearly shown in Figs. 7, 12, and 13 of the drawings. The arms u'are providedv with hubs. u2, that env circle the lower platen-rodvlt and are, held in position upon the rod by the collars 190. The upper frontedge of 4the section U of the paper-table is provided with the usual scale if, i

the spaces of which correspond to the escapement movement of the carriage. From the front rail 52 of the carriage extend upwardlyy and rearwardly suitable sockets (see Fig. 12) that receive the ends i: of the standards V, (see Fig. 10,) to the upper kends. of'which is fastened the upper section U of the papertable. ,The adjoining edges of the upper and lower sections Uv and U of the paper-table are formed of irregular outline,as shown in Fig. 10, and these edges are bent rearwardly, as shown at if, so that. all danger ofthe paper being caught by the edges of the table is avoided. For like reason also the upper and lower edges of the cut-away` spaces u of the paper-table section U are bent rearwardly, as shown. By the use of the long paper-tableI have found that the paper need not be guided into the machine with one hand while the cylinder is being turned with the other, as in other machines. The paper will drop to its proper place by its ownweight and will guide itself much. more evenly than by the. other method. This `is a very desirable feature, sinceit enables the operator' to insert paper inthe machine very quickly. i By dividing the paper in two parts, the larger part of which is;

iixed tothe carriage, I avoid the necessity of lifting this larger` part with the platen when the vupper case is used, the weight of which would materially detract from the light touch,

which is a great advantage. On theleft-hand end portion of the front platen-rod 143is fixed the hub 195 of a lever 196, this lever being provided with a linger-piece 197, (see Figs. 2 and 7,) whereby the lever may be easily ma'- nipulated, and by pushing rearwardly this finger-piece the lever 196 will turn the rod 143- against'the force of the springs (not shown) at its ends and in so doing will turn the collars t', so as to relieve the force of the springs T on the presser-rolls T. It is often desirable to ease the pressure of the rolls, particula-rly in the adjustment-of the paper upon theplaten, y

Suitable springs and the means'last described enables this to be (See Fig. v8.) This bearing-plate Y is bolted'y I to the downwardly-turned upper portion of a spring or clamping-plate 200, the rear portion of this spring passing down and against the cross-rod 414:2 and being .provided with' an` offset 201, adapted to engagea longitudinal groove in the rod. (See Fig. 12.) The spring 200 has its upper front portion formed with a tongue 202, adapted to bear against an offset' or lug 0cV on the casting-w, this tongue 202 serving to force the roller Xdownward and against theA surface of the platen W or the paper carried thereon. The rearportion of each of the springs 200 passes downwardly lbehind the corresponding presser-roll X and is cut away to permit the presser-roll to pass thereth rough, and each of the springs or clamping-plates 200 has .its lower edge extending to and preferably slightly over the scale a3 at the front of the platen. y 200 are provided with inwardly and upwardly So, also, each of the springs or plates v eXtending'guide-fingers 204, that serve to aid in guiding the paper around the platen and to hold it smoothly thereon` By reference to Fig. 7 it will be seen that each of the castings` is provided with an offset handle m3, whereby the' rolls X may be turned upwardly and away fromthe platen, and when vthe rolls are thus turned the lugs my ofeach of the castings will interlock with the spring-tongue 202 and retain the rolls X in such upturned position.

IOO

I-Iaving thus described my invention, what l I claim as new, 4and desire to secure by Letters Patent, isp 1.r In a' frontstrike typewriting machine, the combination vwith a main frame comprising a base and an upright portion at the rear of said base portion, of a paper-carriage and platen mounted at the rear on said upright portion, type-bars arranged about a printing-point `upon the front side of said. platema scale arranged adjacent said platen and below said printing-point, linger-keys arrangedk to operate said type-bars and to form -IIO a keyboard at the front of said base portion and an inclined copy-holder mounted at the front of said. upright portion, directly above said keyboard and intermediate the latter and said platen, the parts being s'o arranged that the printed line, the scale, thecopy-holder and the keyboard are positioned directly in front of and within the visual range of the op- Y 2. In a type-writing machine, the combina-- tion with a power-propelled part and with an erator.

escapement mechanism therefor -comprising

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