US2615550A - Form feeding mechanism for typewriters - Google Patents

Description

Oct. 28, 1952 I A. H. SHARPE FORM FEEDING MECHANISM FOR TYPEWRITERS 5 Sheets-Sheet 1 Filed June 19, 1948 INVENTOR.

A. H. sHARPE EORM FEFEDING MECHANISM FOR TYPEWRITERS Oct. 28, 1 952,

5 Sheets- -Sheet 2 Filed June 19, 1948 INVENTOR. ARTHUR h! S// RPE ATTORNEY Oct. 28, 1952 A. H. SHARPE 2,615,550

FORM FEEDING MECHANISM FOR TYPEWRITERS Filea June 19, 1948 4 3 Sheets-Sheet 5 BLANK PHONE CO.

JAMS" xxx xxx xx XXX XXX XX xxx xxx BLANK pnbus co.

DATE

f y p LA/J/L,

, INVENTOR. 4}? THUR H. SHARPE F" afm ATTORNEY Patented Oct. 28, 1952 FORM FEEDING MECHANISM FOR TYPEWRITERS Arthur H. Sharpe, West Hartford, Conn., assignor to Underwood Corporation, New York, N. Y. a

corporation of Delaware I Application June 19,1948, Serial 34334 1 This invention relates toltypewriting and other-frecord makin machines,.and more particularly to mechanism for' quickly feeding work formsespecially of a continuous strip, into and out of typing position. The typing may proceed, for a succession of forms, on the continuous strip conveyed past the typewriter printing lineby means of a feed roll or platen, driven preferably by power for variable extents of paper feed. a

An object of this invention is to provide an efficient, preferably power-drivenmechanism operableg after a form has been typed, to impart to a roll or typewriter platen a required rotag tion or, sweep of comparatively large extent so as to speedily bring the first typing line of a succeedingform to the printing line.

Anotherobject is to provide such a mechanism for a. carriage-carried, revolvable roll orplaten t of a typing machine and efficiently in a manner so that the carriage mounting the platen may move in letter-space and return directions unimpaired -by the presence of such mechanism. It is also an object of this invention to utilize efiicientlya motor mounted in th e base of the typewriter as the source of power'for so rotating the carriage-carried paper-feed mechanism.

Anotherobject is to provide an eificient automatically operative overthrow prevention mechanism for the paper-feeding meanspsaid mechanism being transitorily operative at the end of each sweep feed of the roll or platen to prevent further rotation thereof, and being automatically restored to a normal ineffective position so as not to interfere with ordinary rotation of the platen by the usual end knobs ortheline-spacing mechanism.

- Asti further object is toprovideeflicient, re

liably operative means to havesuch form-feeding mechanism" operable only when the paper carriage is in a predetermined, fully returned poi Qu-.,.

. It -is also an object to provide a manually operablerkey located in aconvenient position on the typewriter for effecting the form-feeding operation. v

Another objective of the invention is to provide 'amechanism of the above noted character which is simple in design, eflicient, and which requires a minimum amount of change in thecon-' struction of the typewriter.

,Other objects, features, and advantages will be apparent from the following description of apreferred embodiment ofv the invention.

In the drawings:

'11 Claims. (01.197-133) Figure 1 is a right sideview, partly in section,

of .a portion of a typewriter showing the invention applied-thereto, v

Figure 2 is atop view showing the typewriter platen and a portion of the base frame with the carriage and. frame-carried sections of the form-feeding mechanism, i a v Figure 3 is a rear view of the right-hand end of the typewriter showing. the driving parts and an interlock between the conventional carriage return'mechanism and the paper-feeding device;

Figure 4 shows the paper-feed drive clutch of Figure l at the time of its release,

. Figure 5 is a view similar to Figure 4 .but showing theclutch at a later pointin its cycle;

Figure .6 is a front view, .partly in section, "or the form-feed. driveclutch and its connection to the carriage-carried drivev mechanism,

Figure 7 is a side view taken along the line I 1-1 of Figure 2 and showing the-overthrow preventing means in the normal position,

Figure 8 is a view similar to Figure flout show-- ing the parts in the effective position; I Figure 9 is an enlarged top view of a detent releasing means shown in Figure 7, and f Figure 10 is an example of the formsusedin the machine of the present invention. a

, The invention is disclosed as embodied the well-known Underwood Electric Typewriter and therefore only so much of the typewriter as'is requiredtoillustrate the application thereto of the mechanism of the invention will be described herein. .7

' General description Themachine as described herein is designed for typing the toll bills of the telephone companies. These toll bills are supplied in theiorm of long strips with the appropriate headings printed at properly spaced intervals thereon, The strip is placed; in the machineby-passing it. from the rear under the platen andup in front thereof. To the end of obtaining the, properpp-g erating condition of the form-feed mechanism,- the platen isfirst manually rotated in areversve; direction until it is arrested. Ihen'; the paper; strip is adjusted to position the first printingline on the leading form at the printing point, and themachine is ready foruse, v n l V The data identifyingtheqpartywhose. bill is: being made out ,and the'date .are. first typed;- The carriage. is then returned rte-the: right :by depression of the :usual carriage return? key :andi thefirsttoll charge is typje'd-"outr The carriage is returned and the platen line spaced autofeed drive for the platen is driven from the.

splined shaft by way of a gear which partakes in the movements of the carriage and which is slidable on the shaft and includes a gear concentric with th platen shaft and carrying a springpressed pick-up pawl for the-platen. A lug on the platen is initially positioned in contact with this pawl by rotating the platen manually reversely. course of typing each form, this lug movesaway from the pawl. this gear and pawl by the form-feed drive is thus idle until the pawl engages the lug, the form-feed mechanism being, constructed to turn the platen just sufficiently to advance the first typing line of the next form to printing position. 'Afnovel'overthrow prevention device is provided' to engage a ratchet. wheel on" the platen at the endof each sweep feed, thereby to stop the platen from further rotation. The overthrow device is engaged" with such ratchet under control of't'he drive mechanism'but is released from it's engaging position only when it has checked therotation of the platen.

Although the platen sweep-feed mechanism is capable of advancing. the forms at any carriage position, it is'desirable that the forms'be advanced only when'thecarriage is in its fully returned position and for this reason, a form-feed clutch operating linkage is providedwith acarriage-controlled connection which renders an operationof' the form-feed key ineffective at any other carriage position. The form-feed mechanism and the carriage" return mechanism maynot operate simultaneously since both will cause a feed of the platen. Anint'erlock to prevent such simultaneous operation of these two mechanisms has therefore been provided. The combination of these two safety mechanisms will permit the platendrive to be' actuated only when the-carriage i's'in the -;fully returned" position and will permit the carriage return mechanism to beengaged with its'drive at any advanced point in thecarri'age movement only providing the formfeeding operation resultant from the prior depression of the form feed-initiating key has been concluded. I I I v Detailed description 7 The-typewriter to which the present invention is appl'iedi's, as has'been mentioned, thewell-known The initial rotation imparted to As the platen is line-spaced in the v Underwood Electric and for that reason only so' much-of the structure as'cooperates with the new structure has been sho wn herein. The base II, Figure 1, carriesaconstantly runningmotor I2 and 'a pair of 'sideplates l3, only the right-hand plate-being shown herein. Mounted between the side plates I3 is a carriage guide rail ld on which ridesa'pape'r carriage-15; The carriage I5 is fed in letter-spacing direction by a spring-driven drum I6 mounted between the si'd'e plates I3 and connected. to the carriage 15 by the usual flexible tape, not shown. Arack I'I on-the carriage I5 normally engages an: escapement-controlled pinion gear lBzto control. the letter space feed of the carriage l5. Thecarriage [5 may bereturned to its initial starting position by a manually or carriage controlled return mechanism similar to that shown in the Helmond Patent No. 2,262,676, issued November 11, 1941. The gear I9, clutch 20, bell crank 2I, link 22, clutch-operating lever 23 and shaft 24, Figure 3, correspond to elements 112, 124., 127, 152, 153 and 113 of. said Helmond patent, and constitute the clutch and clutch-engaging mechanism for the carriage return drive. Gear I9 is fixed to shaft 24 and engages a gear, not shown, driven by the motor I2 so that shaft 24 is continuously driven during operation of the typewriter. A platen feed drive pulley 25 is fixed to the outer end of. shaft 24.

Platen feed mechanism A splined shaft 28 is journalled in the upper rear corner of the right side plate I3 and in a bracket 29 fixed to the tabulator reed frame 30. see element '72 of the Helmond Patent No. 2,262,676, noted above. Shaft 28 carries, outside cf plate I3; a'pulley 3| which is freely rotatable on a reduced end'of shaft 28 and is retained thereon by a split washer 32, Figure 6, snapped into a groove in the end of shaft 28. A belt 33, kept taut by an idler roller 34, continuously transmits-a drive from pulley 25 to pulley 3I. The inner hub 35 of pulley 3| is toothed to form the drive element of a clutch for shaft 28.

Fixed to shaft 28 between the side plate I3 and pulley 31 is a disc 36 provided with a notch 3'] anda clutch pawl 38, the pawl 38 being pivoted on the outer sideof disc 3 6 on a stud 39. Pawl 38 is formed with a lug- 40 thereon to engage the toothed hub 35 of pulley 3'! and is tensioned for movement into clutch-engaging position by a spring 4| connected between the free end of pawl 38 and a stud 42* on disc 36. Pawl 38 is normally retainedin its ineffective position by a bell crank 43 which engages under a square stud 44 fixed to the free end of pawl 36 and projecting through notch 31 in the disc 36. Bell crank 43 is pivoted on a stud 45 fixed in the side plate I3 and is manually operable under control of a key 4, 46 in the typewriter keyboard to swing clear of the stud M, and thereby to institute asingle cycle ofsha'ft 28. Key 46 is fixed to-- a key lever' 4 which is-pivoted-on the usual key lever pivot rod 48 and is provided with a restorin spring 49. The rearward extension of key lever 41 underlies a shoulder 58 of a vertical slide 5|, Figure 3, mounted slidably'at its lower end by a stud 52, and further mounted slidablynear its upper end in an endwise enlarged 'slot in a bracket 53, both stud 52 and bracket '53 being secured'toa plate-54 fixed to a-bar 55 between the'righ't and left-hand side plates I31" T-he upper end of slide 5| is notched to provide a shoulder-56jwhich is normally positioned under asquare stud 51 on an arm fifl pivoted to f'brac ket 54 and extending through a slot SI in the right sideplate I 3;

- Pivot'edat' 62, Figures 1, 4 and 5, ompntera and resting on arm is an arm 63 carrying a pawl fi l pivoted thereon at Bil-and providedwith an upward extension E9. "A spring 66 connected between a stud' fil' on plate I3 and'a stud 68 on pawl it normally maintains arm '53 in overlying relation against-arm 6i), and further maintains established by contact of the stud 68 against the upper'edge of arm- 63 asshown in-Figure 1-. In

the normal position of 'paw-l 64', a square stud lIlthereon underlies idly arearward arm of"bell key 46,-- the bell crank 43 is displaced counterclockwise by the' pi'n I9 andwill release clutch pawl- 38. Alatch leve'r 'I I also. pivoted on plate I3 on a 'stud 12,- has a tooth I3 on its lower arm and. further has "a bent-off ear I4 on the upper army-A spring 15 between latch lever II and-bell crank 43 serves to normally maintain theseparts in'thir Figure 1 position in which the tooth'lii bears against the rear side of arm 69 and in which the bell crank 43 is retained in'clockwise moved position with its for'wardar-m in contact with'a stud I6 on end plate I3. Disc 36 is. also provided with alpin TI on its inner side for cooperation with the. extended arm 69 of pawl 64. I "Qperatz' onp j platen feed clutch r The mechanism thus far described is operative to" give a single cycle of rotation-to shaft 28 for each operation of key 46. Depressionof key 46' will rock bell crank 43 counterclockwise by 'way of-slide 5I, -Figu're 3, arm 69, arm 63. Figure-l, and-st'ud -I9 of pawl 63.- Such rotation of bell crank 43 releases clutch pawl39 which isthereupon pulled by spring-t engage the tooth 49 with the constantly rotating toothed hub 35 of pulley3 I.

tion latch tooth 13 under arm 69 which has'been raised by the depressionbf key 46, thereby holdin'g' ar'm69,'arm 63, pawl 64 and bell crank 43 in their actuated positions as shownin Figurel. At approximately 99} of rotation of pawl 38 and disc 36,- pin TI- on the disc '38 engages the upwardly extending arm 69 of pawl 64 and, as shown in Figure 5, rocks the pawl- 64 clockwise about its pivot 65' tomove-square stud 19- from under bell crank 43'. Spring 15"then restores: crank 43 to its intercepting position, the return of pawl 64 being blockedby the rear arm'of bell crank 43-so long as pawl 64 is elevated."

-Near the end" of the; revolution of disc 36 and shaft 2'8',--the stud 4 4 of clutch pawl 38"is inter cepted py'crank-ssand is moved radially of disc" 36' to"disenga'ge the tooth 40 of clutch-p'awl38 from the; toothed hub -35". During this radial movement, stud"44'enga'ges ear I4 of'lever H and moves it toward the front of, the machine to release tooth 13 from arm 69 thus allowing restorationof' the key-operated parts 69-, .63 and 64 to theirFigure lpo'sition, studlu of pawl 64 moving under ,crank43'when armf63 moves back to normalposition. It will be seen-that the arm 69 remains operated from the startfto the end of the eye cPturn of the disc; This is so whether the, key 46 is immediately released or not. As' will-become evident hereinafter so long as the arm69 remains operated, there can be no institutionof a; carriage return.

. Platea jeedmechanism rotation pr shaft 2 31 is transmitted to. a

pla n19 fixed to asleeve 1 9 rotatable in carriage I5fby a, train of gearing carriedi'on the carriage I,"t he gearing including a gear 8Iwhich is slid.

able: 1; but rotatable with shaft 28.

29" for sliding movementthereon. Hub 89 of gear 81- is als'o journalled inbearings 82"in a pair of.

carriage -carried frame plates 83 and 84. Plates 93"and 84. fixedly spaced apart by screws 85 and spacers 96, by engagement with the faces of gear fl l-gc 'n'str'ain the -gear8I to move with the carriage-'1 I 5. 7 A gear 89 1s journalled in bearings 82 Movement of 'pa'wl3B to its-engaging" position moves-square stud 44 from engagement with the back of ear- I4 of latch 1ever'I9whe'reupon spring rotates lever I9 clockwise to posi 'b 'BD' of ear 18 I gure is "s' l n d t Shaft in the forward ends of plates 83 and 84 in a ma'nner similar to gear BI. Hub' 99 of gear-89 isfreely rotatable on aplaten shaft 81; fixed in sleeve 19; but is constrained against endwise" movement'thereon by the end of sleeve 'l'9 and a collar'llflsecured to shaft 8'1. This gear- 89 is connected to gear 8| by a pair of gears 9|, 92- rotatable respectively on studs 93 and 94,-tlie' studs'bei'ng fixed in plate 83 and passing through holes in plate 84.-

end of platen sleeve 19. A collar 96, formed with a single tooth 91, is fixed to'the extended-portion of hub 99 by means of a'set screw 95. r

A ratchet gear 98 issecured to the right end of sleeve 19 and carries a pawl I99, Figures 7 and 8, with a tooth I9I. Pawl l99 is pivoted on the right side of ratchet gear 99- and is urged inwardly by a spring I94 into engagement-with the collar 96 and tooth- 91. Fixed to theleftend of platen shaft 8'! is a line-space ratchet wheel I92 which'isdriven step by step in the usual man; ner to fe'ed the paper past the printing-line of the type.

Side plate 84 is held against sidewise movem'eri't' o'n hub-99 by collar 96 and the left side of-gear 89 and plate 93 is similarly held by itsconnet'iftion' to plate 84. Referring to Figure'S, it may be seen that the rear-end ofthe frameis likewise con-' strained to'move witlifthecarriage by'a plate '99- secured to a bar I93 on carriage I5 the frame plates 83 and 84'. 4 I

lnoperation, the platen shaft 81 W111 be age one or more lin'e spaces as the typing progresses so'that pawl I99 fixed tothe shaft will-rotate ahead while the tooth 97 remainsfstationary. Upon depressionof sweep-feed key 46', the shaft 23 will, as previously set out be' driven' one'com-Q pletef revolution This rotation will be transmitted'from-shaft 28 by'gear SI splined thereon,

through gears 92-, 9|, and '69 tohub 99 and fto": tooth 9'I'on collar 96. I he extent'of rotation of sleeve 99 and tooth 91 is-constant for every turn given the shaft 28, and in the embodiment of the invention shown, equals one turn plus an equivalent ,of .a specific number. of line spaces. Obviously; thesizes of gears BI "and 89 are selected imaiccor'd with the length of the particular form'- to-be used, and, unless. the length of the formis exactly equivalent to thecircumference of' the platen, the latter-will at-the endof each :rorm: feeding operationiassume a' difierent rotative position. After an idl period of rotation 'ofi sleeve .99, as determined by therotative move ments 'impartedito the platen shaft 81 through? line-spacing action,- the tooth 91' will engage and pick up .the' tooth I 9I of pawl I99; Further rota tion of the gear99 and tooth 91 will cause rota tion of platen shaft 81 by an amount whichin reference tofthe form length is complementary to. the; extentv of rotation given shaft- 81; P during the typing operation. The additional rotation so given toiplaten IB-Qn each cycle of shaft 29', f willibe appropriateto advanc'ethe strip of forms to the first typing line-of the next form irrespec-'- tive of the extent of previous amount of move ment given the platen by line-spacing em'ove ments. v I '1 The platencnd bill chute The forms used in the disclosed embodiment I are, as shown in Figure 10, printed on a long stripof paper. I96 which is perforated as at I91 for easy separation of the forms,

e The left-hand end of hub-99 is extended to pass through plate 84 to abut the and embracing I The strip I usually folded along lines I91 into a mamrom" 1" packfor: convenient handling. The-strip I06 is: guided about platen I8 by a. chute comprising,

members I08 and I09; Figure 2, having identical of bail H2 and is-therefore made lengthwise a'd iustable-to provide'new bearing areas for the-bail I I2. The rod H3 is adjustably held against endwise movement by upturned ears H4 of a; pair of. stops H5 secured by screws H6 and I IT to brackets H I. Screws H6 pass through slots H8 inistopsI I5 and when loosened will free stops I I5- for adjustment of cars II4 about screws H'l. Chute guides I08 and I09 carry set screw collars IVI9 -by. which the guides: may be. fastened to rod H3 to prevent distortion of the forward end. of theguides.

ltl-will-be notedthat the platen I8 has been reduced in length to less than one-half of the usual. size. More length is not needed. since the-stripl06 isnarrow and is advantageous since the elimination ofthe excess length. both reduces the force required to prevent overthrow of the platen feed mechanism and allows room for the feed mechanism inside of the. carriage and plates, thereby simplifying the construction and-assembly. Knobs I20 are fixed to the outer ends of platen shaft 81 to allow a manual line spacing. of the platen I8 in either direction; Due, however, to the pawl I00'on ratchet 98 and tooth 91' on. collar 96, theplaten may not be reversely rotated past the first typing line of the form being typed on but may be rotated forwardly without interference since pawl I00 will freely rideover tooth 91in thisidirection.

Qverthmw' prevention mechanism A- novelmechanismhas been provided topre ventan excess rotation of the platen I8 th'rough momentum at the end of its sweep feed. This structure is: normally ineifective and isthrown into its active position only at the endcf' a. form-.- feeding cycle. Restoration of the overthrow preventing meansto idle condition is eifected under controli'of theplaten as the latter is arrested.

and-.overerotationcf the platen. is prevented. The platen in its concluding movement, .by' powenof" momentum stored therein, acts on. and removes the? overthrow-preventing means: from interference with further platen rotation. This preventingmeans as. shown in Figures- '7 and 8 is auxiliary stop slide' I25 with slots I28 is slidably mounted on a pair of studs I2! on lever I23 and:

is urged to aforward position by a spring I29 connected between the two lovers" I23 and I26. In thev forward position of slide I26, Figures, its stop nose I30? is slightlhahead oijthe correthe slide. in: its rearward. positionon the. lever,

I23 and; so as toallow the lever I23 to occupyits-normali position clear of the ratchet wheel- 9.8;, Responsive-to: the operati'onof thekey 46,;theishaft 28 rotates clockwise;., andathus the'-ear-I-33 moves away; from: the: projection I34 to: permit spring; I29? tor move: slide I26 to its forwarcrnositi'on onthe lever. I23. Near the endfof' the full.- cycle: of rotation of shaft. 28,. see. Figure- 8, ..the; ear I33 moves: under: projection: I34 to raise-the: rear end of slide I26 and lever I23 and thereby to depressthestop noses I30; I 3I of the lever and slide: into the path of one of the teeth of the ratchetwheel 98. Theclutch pawl=: isforcedi free: of theotoothed-hub 35before the full revo-r lution. of the shaft 28 is completed, 'butsuch.-

shaft completes its revolution byrstoredimom'en-n tum. Furthermore, due t theacquired inertia'of. the platen 18,. the ratchet wheel 98; andtheplaten; knobs I 20,. these partsdo notstop their counter clockwise rotation when the drive-from the tooth-.- 91- ceases. During the continued rotation f platen I8, a tooth of. ratchet wheel 98 advances. intoengagement with the projectednose I30 ofi s1ide: I25- and forces the slide; rearwardly to av position wherein it may dropandbelatch'ed bee hind ear' I33, Meanwhile, however, the advanc ing tooth of theratchet wheel 98engae'es'thet nose of the lever I23 to prevent further. advance: rotation of the platen: Since" the. pivot of lever. I 23, namely the stud 94, is1slightly outsidea liner tangent to the wheel 98. at a pointofcontaot; withnose I30, the lever I23will not immediatelv." move ireezof thera-tchet wheel 98 when the 02:11]? ming: projection I3 4- moves rearwardly of; theiear. I33, but will temporarily cling to the engaged; wheel tooth. Uponthe clash of the. wheelitooth with the stop=nose- I3I'; there-ensues a slightlree bound of the-wheel and platen, and the spring I25 is resultingly enabled to swing. the lever I 23 with the. slide I26 soas to position the stop noses: I30, -I3I clear of theratchet wheel 98. Thusth m stop nose I3I, comprising, thE-MJVGlYthEOW-DIB-i venting means has been transitorily; active.

Flatten detent release A1 platen vdetent I 31', Figures I 7. and 9, carrying. a. roller. I382 is pivotedronstud-93 andtensioned by a. sprihg- I391 connected. theret ntosengag e roller. I 3 8. with. the teeth. of ratchet 98 and. thus hold"; the platen; 'I'B inits adjusted. line space po- '7 sitions The detent. roller. I38 islocatedsothat the wheelilt upon arrest. by the nose I3l will; come to rest in a slight. back-up relation. with.

respect to the stopping nose- 'If3IQ. as is. clearly evident from Figure 7'. 'Duringa. sweep fedof the platen I8 to advance strip I06 to the next form, it is desirable to release? roller I 38 from ratchet 98. Collar I32 is formed with. acam notch I40' so positioned that in the normaI.po-.

..si'tion,o'f shaft 281.21g. roller. I II.onafplateJIH? may enter. into-thenotch' I40.. Plate- I42 ispiv oted on stud 94" and tensionedi clockwise by a spring I43 connected). to. its upper end. and-a convenient part of. frame. plate. 84." AT screw:

. I44 is adjustably 'fixed in anear. I45'of plate-J I 42. and cooperates with. a. corresponding bent-I eari I46 ondetent lever I3I'..'. ColIar. I.32,.duri ng the. initial. part of therctation of shaft 28,-rocks.

plate I42 countercloc'lrwise and this. movement} ofi plate. I42 is transmitted through screw I to detentlever I31 thus moving roller I38 to the dotted line position of Figure 7 where it is out of'engagement with ratchet 98. Atthe end of the revolution of shaft 28, roller I38 again drops into notch I40 and frees detent lever I3'I for movement into its effective position.

' V DisdbZin g of form feed mechanism 'To. insure that a new form will be properly positioned for. immediate typing, the effectiveness of the linkage from key 46, Figure 1, to clutch release pawl 64 is placed under control of carriage I so'thata form-feed cyclecan be initiated only in the fullyreturned position of the carriage. Referring to Figure 3, it may be seen that the upper end of slide 5| is urged to the rightend of the slot in bracket 53 by, a spring I50 con-v nected between a stud I5I on bracket 54 and a lever I52 pivoted on a stud I53 of slide 5|. Another-Istud I54 on slide 5| is engaged by the lower end of lever I52 to prevent clockwise rotation of lever I52 from its Figure 3 position. In the righthand position of slide 5|, shoulder 56 is not under stud 51 of arm 60 and vertical reciprocation of the slide 5| by key 46 is thus ineffective to initiate a form-feeding cycle. Slide 5| is moved toits effective left-hand position by a tappet I on the carriage l5 which will, in the extreme right hand'position of carriage I5, to the left Figure 3, engage an ear I56bent oil? of lever I52 and move shoulder 56 to the effective posi tion under stud 51. It may, however, happen that the form-feed key 46 will be depressed before the carriage has moved into its extreme right-hand position in which case slide 5| cannot.,move to the left'in Figure 3 since stud 51 willflengage the side of slide 5|. .In such case,

. contact of tappet I55 with ear I56 will rock lever I52j'idly, about its pivot stud I53. Uponrelease of keyj46, slide 5| is restored to its lower positionby spring I51 whereupon spring I50 will move slide 5| tothe. effective position under stud I51. The key 46, if then reoperated, will insti-' 'tute a form-feeding operation.

Carriage return-form feed interlock Aninterlock is provided between the carriage return controls and the form-feed controls to .prevent' their concurrent operation and possible and thefgear hub 86, a simultaneous operation, of these twomechanism's might cause damagethrough .stalling of the machine due to excessive friction at'the spline fit between the hub 80 and the shaft 28. To prevent-such simultaneous operation, anarm IGOQFigure 3, with an earIBI ben't from it is mounted on the carriage return initiating lever 23. A plate I62 is fixed to the form-feed arm and will, in the operated position'of arm 60, lie over ear I6I' and prevent movement of arm 23 for engagement of the carriage return clutch 20. It will be remembered that the arm. 60 is moved to operatedposition by operation of the key 46, and is held thereat by the latch lever II until theend of the cyclic turnof the shaft 28, at which time by the outward displacement of the pin 44 of the clutch ure 3 and'the .ear-I6I of sucharm will then'zliein .the'. operating path of the 'plate- I 621and .rwill prevent movement. of :the arm 6I| 1301 aclutch-- closing position for form=fe ed. 1: -J;

The embodiment di'sclosedis :not-the only form which is within'the scope of: the present .invene tion as various modifications and changestmay be'made without departing from the invention as set outinthe appended claimsm'v 1v Whati-sclaimed I 1. In a typewriter having-'a'frame, and a'car' riage slidablerthereom the combination" of a platen shaft rotatable insaidcarriageya platen onsaid shaft, a-imotor, and moter-operated means to rotate said: platen to a predetermined point, said means comprising ashaft supportedon said frame, means'rotatable onsaid platen 'shaft'ya member on said platen shaft engageable bysaid rotatable:means. in one-direction :of' rotation thereof,- carriage-carried means slidableon and rotatable with saidframe-supported shaft, means on said. carriage operativelyconnecting said slide able means andsaid rotatable, means,akey.;con-. trolled means driven by-said motor .to give .said shaft singlecycles of rotation, and means operate ed by said slidable means at the end of 'a rev'olue tion of said frame-supported shaft. to stop rotation of said platen shaft.

2. In a typewriting machine; a frame; aiJcar riage movable thereon, a platen rotatableinsaid carriage, azdriving, member concentric; with said platen, a'ilQstiTmotion, one-way;., connection;;- between: said:- platen. and :said; -member; a :shaft on said framepa carriage-carried ,gear.pslidable on said shaft; and splined thereto, gearing con: necting said slidablegear andsaid driving mem-. bei', .key controlledmeansforrotating said shaft; and meansfto. preventexcess rotation ofisai'd platen; saidumeans comprisingxa ratchet-,vvheel" fixed tosaid platen,-a stop lever on saidacarllage,

a'sto'p :slide on said lever and-ai-cam ongsaid slidable :gear, :said cam co--acting :with said i-stop slide to depress saidlever and slide into {blocking engagement, with said ratchet Wheel whereupon excess rotation of saidplaten;movespsaidslide to a position free ofsaid cam; -11

3. In-atypewriter havingga frame, a'carriage movable thereon, a platen in saidcarriaget and: a

source ofpower; means'ato rotate said platen to an advanced position comprising; a shaft, driving means between! said shaft and said platen; said driving meanshavinga lost motionone-wfHhdriYe to said platen,;a clutch dog-onsaidshaft -a power drivenmember freely rotatable-on-said shaft,

said drivingmeans having ,a lostmotion ones-way drive to said platen, a clutch dog on saidshaft, a

power driven member freely rotatabley oir said, shaft, members to release said dog to permit-itv 11 tolengage said :power. driven-member and "to disengagesaiddog at the end :of one revolution 'ofsaid shaft, a1 key-operated slide toioperate said release members, :means' normally :hol'ding :said

;slid"e:;in .an inefiective position, means on "said carriage to move-said slide to an efiective position, a cam operated by said. shaft, means :set by said card at the end of -a revolutionthereof to stop rotation of said platen, and meansresponsivetto-the arrestyof the platen by said cam-set means for resetting said cameset means to an ineffective position.

5. *In-am'achine of the classldescribe'd, having a paper-supporting carriagemova'ble on-a frame; a paper-feeding roll supported on :said carriage to v.turn on .an axis extending parallel -to the direction of carriage movement; means movable alongwith ,the carriage and operable to impart rotative movements to said-roll .which place the latter in difierent-rotative positions, said rotation imparting means-including a rotatable :elementshavingan axis extending parallel to :the carriage, power-meansto 'imparta single rotationtosai'delement, comprising a one-revolution clutch on :the frame axially in alignment with said :element, :and I means :including shaft means extending parallel to the directionlo'f carriage movement; connecting said vclutch operatively with said element in any position of the carriage, a circular-array of-teeth associatedrfor rotation instep with said roll, and means on the carriage, responsive'to said element at the end of each revolution imparted thereto, to .move :into rotation limiting relation with said teeth, thereby to stop rotation-ofsaid-roll. I

6. In a machine of the :class described, having a papen-supportingcarriage movable on a frame; a paper-feeding roll supported to turn on said carriage means movable along with the carriage and operable to'impart rotative movements :to said roll which place the'latterin different rotative positions, said rotation imparting means in cluding an :element having an axis extending parallelto the carriage, powerr-meansto impart asingle revolution to said element, comprising, acne-revolution clutch on the frameaxially in alignment with said element, and means including splined shaft means extending parallel to the direction of carriage movement, connecting said clutch operatively with said element in any position of the carriage, means on the carriage,

, responsive to said element at the end of .each

revolution'imparted thereto, to stop rotation of said roll,'a"-key-control on the frame operable "to close said clutch for one revolution of said shaft means, "and means including a control element on the carriage to incapacitate said key-control in all but a returned position of the carriage;

-'7. In a machineof the class described, having aQpaper-fee ding roll, a wheel associated with said roll and having teeth gforming notches defining linees'pa ce positions, a line-space detentnormally iniengaglement with .anywheel notch, means oper able to impart, extensive rotative movements to said roll which place said roll in different linespace positions, an elementwhich is given asingle revolution each time said operable means is t impart .a rotativemovement to said roll, means normally clear of said detent wheel and-transitorily responsive to said element atxthe end of each revolution to move into rotation limiting engagementswith the teeth of said whe'ehand means including'control means .on said element, to release said detent at the outset of each revolution "ofzsaid element and to apply in; again when :th'e revolution nears conclusion.

8."In:a machine of the classdescribed having a paper feeding roll :and --a turning member ffor saidroll, means al-ways :rot-arily connected with said roll and comprising'tee'th arranged in =a circular array and defining aseries of different rotative positionsfor said roll, a single revolution element, power means to impart singl revolutionsto said element, motion :transmittingmeans always ready to transmit motion from said element to said :member and at a ratio iforsaid element; at :each revolution thereof to drive the roll :to one-of :the said ro tative :positions defined :by said teeth, a device conditionable'iorr01lstopping ooaction with any one of said teeth arriving at a certain position at the end-o'f eaoh revolutionof said element, means on-sai'd element and in control oversaid device to condition the latter atthe conclusion of each revolution of said element, and means responsive to the ensuing roll-stopping coactionof said devicewi'th one of said teeth to placesaid. device automatically *in ineffective condition permittin impartation of a new revolution to said element.

-"9. In amachine of the class describedhaving a paper-feeding roll and ;a turning member for said roll, :means constantly connected to -said member and operable to impart rotative movements thereto which will-place-suchroll in any one of a number of evenly spaced :rotative positions, said operable means including an element which is given a single revolution-for imparting each of said rotative-movements to said roll, a circular array of teeth associated with said roll for rotation concentrically -therewith, said teeth circularly spacedin conformance with the rotative ,positions of .the roll, and mean responsive to said elementnear the conclusion of each revo lution thereof to move into the path of 'saidrteeth for roll-stopping coaction .Withone of said teeth; and-responsive to said, roll-stopping ,coaction with any of said teeth to move automatically ,clearof the path of said teeth and permit impartation of a new rotation to said element.

10. In a machine of the class described, having a carriage movable on a frame and having'a paper-feeding roll mounted on the carriage to turn on a certainaxis, means to power-rotate said roll, comprising, ashaftrotatably mounted on the frame and'extending parallel to the .carriage, on anlaxis different from that of said roll. anelement turnable'by said shaft andihaving ,a splined connection therewith for movement along said shaft, means on the carriag to cause said l m nt to move alon with the carria e, ,means to transmit rotary motionirom .said element to said roll, and power means to impart single rotations to said shaft, meansalways rotarily .connected with said roll and comprising a tooth moved toward :a certain location each timeisaid element approaches the end of a rotation, a device ,conditionable for roll-stopping .coaction with said tooth. means on said element in control over said device to condition it at the conclusion-of each rotation of said element for roll-stopping .coaction with said tooth, and means responsive to the ensuingroll-stopping coaction of'said device with said tooth to place said device automatically :in ineffective condition to permit im partation of anew rotation to said. element.

.11. In a machine of the class described having a paper-feeding roll, a rotary element, power means to impart single rotations to said element,

gear means to transmit rotary movement from said element to said roll, a line space detent wheel associated with said roll and provided with detent notches, a detent normally engaged with said wheel in one of its notches, and means to release said detent during each rotation of said element, comprising, a cam unitary with said element, and means including a follower controlled by said cam and operatively connected with said detent to release the latter at the beginning of each single rotation of said element and to apply it again automatically at the end of the same rotation.

- ARTHUR H. SHARPE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,113,103 Cooper Oct. 6, 1914 1,133,004: Carlin Mar. 23, 1915 2,066,305 Carroll et a1 Dec. 29, 1936 2,251,147 Mann July 29, 1941

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