US2566953A - Manifolding ribbon mechanism - Google Patents

Description

561354, 1.951 G. F. MORRIS 2,566,953 l MANIFOLDING RIBBON MECHANISM Filed July 29, 1947 5 :shees-sneez 1- ATTORNEY G.- F. MORRIS MANIFOLDING RIBBON MECHANISM sept; 4, 1951 5 SheetS-Sfleet 2 Filed July 29, 1947 ATTORNEY Sept. '4, 1951 y G. FI MORRIS MANIFOLDING RIBBON MECHANISNI Filed July 29, 1947' 5 Sheets-Sheet 3 lNvENToR afi-0R65 E MORE/ Et l ATTORNEY Patented Sept. 4, 1.951

MANIFOLDING RIBBON MECHANISM George F. Morris, Etobicoke, Ontario, Canada, assignor .to International Business Machines Corporation, New York, N. Y., a. corporation of New York Application July 29, 1947, Serial No. 764,447

l -This invention relates to typewriting machines and in particular to ribbon feeding and reversing mechanisms.

The primary object is to provide a, simple and improved ribbon reversing mechanism.

Another object is to provide a ribbon mecha- Other objects of the invention will be pointed out inthe following description and claims and illustrated inthe accompanying drawings, which disclose, :by way of example, the principle of the invention andthe best mode, which has been contemplated, of applying that principle.

'In the drawings:

. Fig. 1 is a plan view of the carriage of a typewriting machine showing the present invention attached thereto.

Fig. 2 is a front elevation.

Fig. 3 is a perspective view of the carriage.

Fig. 4 is a vertical section on the line 4 4 in Fig. 2.

Fig. 5 is a vertical section on the line 5 5 in Fig. 2.

Fig. 6 is a large scale side view of the feed pawls and ratchets.

. Fig. 7 is a vertical section on the line 1 1 in Fig. 6.

Fig. 8 is a view similar to Fig. 6 of a modified form of reversing mechanism.

Fig. 9 is a vertical section on the line 9 9 in Fig. 8.

10 is a large scale vertical section on the line Ill-I0 in Fig. 2.

The invention is shown as applied to the carrlage of the Well known E1ectromatic" electric power-operated typewriter. It will be understood, however, that this has been done purely for convenience in illustrating the invention and that the ribbon mechanism may be applied to other typewriters whether manual or power operated or to other carriages, such as accounting machine carriages with only minor alterations not involving a change in the principle of the invention.

The reference numeral l0 in Fig. 3 generally designates the typewriter of which only a small portion of the framework is shown and which 7 Claims. (Cl. 197--153) 2 inking ribbon i2, the latter being supported by the usual ribbon vibrator I3 and ribbon guides.

le. The carriage of the typewriting `machine comprises the side plates l5 (Figs. 1 to 4) which are rigidly joined together in a well knownv way and mounted on the usual track (not shown) so as to be capable of movement to right and -le'ft (Figs. l and Z). Rotatably mountedin the side plates i5 is the usual platen assembly I6 including the hne space ratchet Hand the platen rotating knobs I8 and this assembly is vremovably mounted in open notches lain the plates lI5 and held therein by the usual spring pressed latches I9.

Secured to the carriage side plates I5 are the supporting plates 20 (Figs. 1 tofi) fwhich are roughly triangular in shape. The right hand plate 26 has secured therew an offset bracket 2i which. together with the left hand plate 20. rotatably supports a shaft 22 on which is loosely mounted the lei't hand ribbon spool 23, a suitable collar 24 preventing the spool 23 from sliding to the right (Figs. 1 and 2) on the shaft 22. The right hand end of the shaft 22 is received in a flanged bushing 25 (Figs. 2 and l0) which is rotatable in the bracket 2| and retained therein by a collar 26, the set screw of which passes through the bushing 25 and engages the shaft 22. The bore of the bushing 25 loosely receives the end of a thumb screw 21 having a threaded shoulder 21a screwed into a hole' in the 'right hand plate 20. On the shank of this thumb screw 2l the right hand ribbon spool 28 is freely rotatable. It will .be seen that the thumb screw 2l may be unscrewed and removed, thereby permitting the ribbon spool 28 to be removed from the machine.

In order to establish a driving connection between the shaft 22 and the spool 28 the flange 25 is provided with two diametrically opposite pins 25a which register with holes in the side ange of the ribbon spool 28. Suilicient clearance is provided between the plate 20 and the bracket 2| to permit the ribbon spool 28 to be disengaged from the pins by a lateral movement to the right (Fig. l) after removal of ,thumb screw 21.

The feeding of the ribbon and the reversal of the feeding movement is accomplished by'means of mechanism which is mounted between the left hand ribbon spool 23 and the left hand plate 2D. This mechanism includes the feed ratchet 29 (Figs. 1 to 4, 6, and 7) which is fixed to the left side of the spool 23 and conveniently has eighteen includes the usual type guide Il and Ordinary teeth and a similar ratchet 30 fixed to'the left 3 hand end of the shaft 22 adjacent the left hand plate 20. Loosely mounted on the shaft 22 is a hub 3| (Figs. 5, 6 and 7) having two oppositely facing shoulders 3| a on which are mounted the control ratchets 32, 33, each of which has ten teeth, these ratchets .being secured to the hub 3| by means of the screwg 3|b of which three are provided foreach ratchet in staggered relation, whereby the hub 3| and the two ratchets 32, 33 form an integral unit loose on shaft 22.

Loosely rotatable on the periphery ofthe h ub clutch arm 34 which is provided; with, a; slotl 34a (Fig. 5) within which is mdemmomined. mieten ball or roller 34o engaging-,the periphery-.cfs huh.

3|. The slot 34a becomes progressively shallower from the top to bottom (Fig. 5l sollthat tivzhentl-1eu clutch arm 34 is rotated countercloc'zkvv'isev in Fig.v 5 the wall of the slot, assisted by a spring34c,

tends to jam the ball or @ller 34h against the hub e;

riverain neared oeopppsnesiees-.Qf neem I 34 are' the f eekflinawlaft-'utl (Figs- 1 tn i whieh are interconnected@ tbeiaendsibra rgkeshaped 2119.31 (Elige 1) lcpselsateceivedia holesiln .the noses of the pawls and serving as an anchor for a commen eeetalieaepriaeefettlie newlsithe other. easl, 01` thefeprirlggbelnealithnredtga hook. eepurel tothe ideeen-the elliteliiarm The spring vit.tenciatoiepaasatlieanniivzith raten: eis 2 9 .and 32. a11Q- t12ef9ewh 3ra with tlieratehets 3 and 331. respeetivelmthe ravvisbeine.t wicle, e'nouelifor thlannrnpsa i The teeth. 0.1i Le.. reichte-te 32,. iarestaseered S0 that eaelltegtll Q13 Queja aligned, axially: of. shaft 22. with @paesi-mately, the; middle o f.. a toothepaee. Qnitlie Qtheriretchetso that in, side view the twe.rateliete.loolalilsetaingle 2li-,tooth ratchet. 1

The ratchete- SZe are slielitlnlaraerin diam: eter than theratelietailillt wherebyitispoesif ble for theratcaeis a2. tehoiame pavos es, .e

36 .clear of thejrfassgciatedgratehets29, 3 1 under; Certain ConditleliS-L Tiberian-lati. areselectiveli7 controlledbrftlle.' retchetazi 3.3. through a pair of rbbenveelers 4&. 4I.- Eies 1 to 4i associated with thgr-.ibbQn-snoplssand 28. resheutigel ly- The feeler.i 4f! ,laseeureditofa shaft -42- wni cn is rotatable in the plates 29 and securemto-the Shaft, et il'aileltiheydiends-elae rateheteontrol neer 43 The feeletleveal is essere@ to e sleeve 44 t0 which iealtaehesl asimilar finger 4s. The feeler levers 43, 4| egtendrearwardly of the machine and normally -rldeuponthe -coils of ribbon; on the sp0ols -23. 2,8,V whereby theV levers 4|), 4| are lifted by thelacumulationsof ribbon. or a1- lowed to drop by, thennwinding of ribbon bythe respective` spools', theleyers being weighted at their ends for this'purpose. The control inger 432-, is adapted to engage,izheteethoi; the ratchet 32 and the linger 4,54 to engagethe-ratchet33- under certain conditionsA tov prevent retrograde` movement thereof.y

In order to understand the operation of theF mechanism jnst described it will be'assumedthat a reversal in the ribbonfeeding mechanism hasY 4 is about to commence winding as illustrated by Fig. 3 in which the right hand spool 28 is full; Figs. 4, 5, and 6 illustrate the condition of the various ratchets and pawls immediately after the reversal has taken place and the mechanism has become operative to feed the ribbon on the left hand spool 23,11;v will b e noted from these iigures that-.the ratchet 32 is in such a. position as to enable the pawl 35 to engage the teeth of ratchet 23 whereas the opposite condition prevails with respect to theratchet 3U, owing to the fact that the 'teeth in the ratchets 32 and 33 are staggered, the

paovl .3.6, being held out of engagement with the ratchet 30'. It-.wilt be noted in Fig. 5 that the iinger\45',fwhich-is attached to the feeler iinger 40 for the left hand spool 23, is in the path of movey ment Q f atoothorrthe ratchet 32.

just taken place-land that'theleft handlspool 23- 75 "Let it be assumed that the arm 34 is now 0sl cilla'ted a clockwise direction and restored an angular distance slightly greater than the enga--- lar; distanoehetween two teeihin theratchetla allows; the. pawli 3.5i to engage. the next. sun-l ceeding tooth in a clockwise direction. onratchet 29.-v and`v on; theretilrn strokeo,f the arm 34, said ratchet and the, spool; 2 3; to which itA is attached WilLbe; rotated in, ay countellockwise; direction onetooth space; thereby feedingasmallamaunt c-the rihbonomthespool..

- Whenthe arm 34; is.- oscilla-ted clockwise the ratchets 32 and 33 follow.thearnn 34,. Thisiszdne to the combined effect of frictionbetween the hub 3L and arm 34;; thefriction between; the. clutch roller. 34b,;the hub-3 1' and armi3 4; and tha-drag of the pawls 35, 36 on the ratchets 32, 33. Hnwfever,. no relative displacement occursbetween the arm 3 4., and the ratchetsm and-.331;withthe re.. sultthat the-paw).- 3 & ismaintainedi in| an. ele-- vated positionclear of: the teethfinthe ratchet 3.0,-:so that onthe return strokeof thearm34the ratchet 3 |k is.notaiected.

While the nger 45 is in the path. of: a toothdn theL ratchet,3 2 there will exist-a clearance between such toothandthefendof the finger of. approximately the angular distance betweenftwoteeth, on the ratchet 29 witntha result. that the tooth merelyL moves up to the-finger: 45: and;may move the-ratchets 32, frelative: tu-.thegarm 341an insignificant amount insufficient to disturb the relation between the: pac/:1. 36 and. thefratchet 30. Thus with each oscillation of the arm 34 the rib bonds. fedfon. to i the spool 23 .aridas this action continues the finger 45 is graduallymovedinta clockwise direction.imtilzit'isecompletely clear of the ratchet 32. While this action is taking place the other finger 43; wilt be gradually permittedto drop, due to the unwindingiofethe.ribbon-fromthe SROQl 2.

When the arm 34 is fully restored as in Figs. 4, 5l and-6lwitn-thezparts' operatingundertne above conditions, there will be a tooth-1in; ratclietzz33 justg clearfofgthegarc; traversed; by, the; .end of. the linger., 43"a nd, this -tooth, asthe arm 3.4.;isrocked; clockwisewill e trayel across-such and clock'.- Wee' a distaneefequaktoi slightly mpref-thanY-the distance betweentwoqteethon theeratchetzm but.. QWQS tO'ffaQt thithQ-,ngeit-S iS;A iillI-Sv time; quite a waysaway from-the rati/ het 30,4 vnothing` will happen to changethe-vrelationf between 4the ratchets; 3 2, 33i and ther pawlsf 3 5; 36- andf the ribbon'. Will- ;continue tofgfeed omthe spool 23;.

Ultimately the spool 28 will become exhausted there wil1be a pointf Where thefinger 43 drop intoa positiontoe catch r, the; tooth of ratchet Silmentioned above and will assume a: p9eitloniike-theznger #l5- 1n Eie-,- 4. n is quiteclear, that with the ratchet "33 in the position of Fig. 4 and with the finger 43 .now occupying the position occupied by the iinger 45 in Fig. 4, the next oscillation of the arm 34 will cause the nger 43 to catch a tooth in the ratchet 33 and prevent said ratchet, and likewise the ratchet 32, from moving clockwise with the arm 34. Thus there will be effected a displacement of the ratchets 32, 33 in a counterclockwise direction relative to arm 34 and this will cause the tooth which is holding the pawl 36 out of engagement with ratchet to move out from under said pawl and permit it to engage the ratchet 30. At the same time a tooth of ratchet 32 will move underneath the pawl and elevate it out of engagement with the ratchet 29.

With the restoring movement of the arm 34 the tooth which engaged the linger 43 will be backed away from the finger 43 and the same relationship will now exist between the finger 43 and the ratchet 33 as exists in Fig. 5 between the iinger and the ratchet 32. Since the pawl 36 now engages ratchet 30, the latter will be actuated a tooth space in a counterclockwise .direction upon the return of the arm, since the shifting movement which eiects the reversal in the feed of the ribbon takes place during the clockwise portion of the oscillation of arm 34. It is thus apparent that there ls no risk of locking or jamming the two pawls 35, 36, due to indefinite transition as sometimes happens with other feeding mechanisms.

Owing to the spacing of the teeth in the ratchets 32, 33, it is impossible for both pawls 35 and 36 to engage their respective ratchets 29 and 3|! simultaneously. Since the reversal takesplace on the forward clockwise stroke of the arm 34, the ribbon is moved backwardly instead of forwardly at the time of reversal so that the next impression of the type will not vbe through the same portion of the ribbon. It is thus seen that the point reversal of the ribbon is clear-cut and sharp and there is no chance that several impressions may be made through the same portion of the ribbon during the reversal period as sometimes happens with ribbon mechanisms in which tension is relied upon to eiect reversal and movement of the ribbon is blocked until enough tension can be built up in the ribbon to render the reversing mechanism eiective.

In Figs. 8 and 9 there is shown a modified form of control mechanism for effecting the reversal of the ribbon. In place of the ratchets 32 and 33 there is provided a pair of cam plates 50, 5|. having cam lobes a, 5|a, respectively designed to cooperate with the pawls 52, 53. The cams 50, 5| are pivotally mounted on an arm 54 by means of shouldered washers secured to the arm 54 by means of screws 55a, the arm 54 and the washers 65 being centered on the shaft 22 by a bushing 56. The cams 50, 5| are formed with shallow depressions 50h, 5|b receiving the balls 51 of a double ball catch carried by a hole in the arm 54, a spring 58 common to both balls urging them into the depressions 56h, 5|b. Each cam has two depressions enabling it to be yieldingly held in either of two set positions. The cams 50, 5| are interconnected by a pair of intermeshing pinions 59 which are pivoted on studs carried by the arm 54. The arm 54 is bored to accommodate the pinions 59 and these bores intersect to provide a space to permit the intermeshing of the pinions 59. Each pinion meshes with suitable teeth formed in one of the 'cams 50, 5| and the eiect of this construction lato' compel the cams tomove in'scissors fashion whenever either one of them is given a displacement. The cams 50, 5| are each provided with a single tooth designated 50c, 5|c (Fig. 8), designed to cooperate with the lingers 45 and 43. respectively.

It will be noted in Fig. 8 that the parts are shown in the same operating condition as the parts in Fig. 4, it being assumed that the linger 45 has lust been effective to reverse the ribbon to cause it to feed on the left hand spool 23 as was assumed above in describing the operation of the mechanism disclosed in Figs. 4 to 7. It will be noted that, as in Fig. 4, the nger 43 will not be in a position to engage the tooth 5| c and that the tooth 50c is displaced away from the end 'of the finger 45 approximately one tooth space-on the ratchet 29 whereby, when the arm 54 is oscillated clockwise, the tooth 50c will move up to engage the nger 45 at about the end of the stroke of the arm 54 and will'have no eiect on the relative positions of the cams 5|. 50.

In Fig. 3 the cam lobe 5 la is engaging the pawl 53 and holding it out of engagement with the ratchet 30 whereas the lobe 50a is clear of the pawl 52, permitting the pawl 52 to drive the ratchet 29. When the positions of the fingers 43, 45 are reversed, as will take place when the right hand spool 28 becomes exhausted, the linger 43 will take the position now shown by the nger 45 in Fig. 8 and catch the tooth 5|c, thereby preventing the cam 5| from following the arm 54. This causes the cam 5| to be displaced in a counterclockwise direction relative to the arm 54 withdrawing the lobe 5|a from underneath the pawl 53 and actuating the cam 50 in a clockwise direction relative to the arm 54, through pinions 59,' to move the lobe 50a underneath the pawl 52 and elevate the latter out of engagement with the ratchet 29.

In order to limit the scissors-like motion of the cams 50, 5| on the arm 54 to a. distance equivalent to approximately a, tooth space on the ratchets 29, 39, there is provided a stop pin 54a.

The arm 34 may be actuated by any suitable means such as a line space lever mounted on the carriage. In the illustrative embodiment of the invention it is preferred to connect the arm 34 by a link 66 to the usual line space slide 6| which is vertically guided and actuated, in the manner disclosed in Patent 1,957,322, each time the platen i6 is line-spaced. The slide 6| carries a line space pawl 62 which coacts with the line space ratchet as in said patent.

The usual line space control lever is replaced by an L-shaped lever 63 which may be reached from the rear of the machine. This lever carries the usual pin 63a which functions in the usual way with a second lever 64 to control the stroke of the pawl 62.

In order to 'prevent the ribbon spools 23, 28 from spinning when they are unwinding, the brake fingers 'l0 are provided. These fingers are pivotally mounted on the studs 1| (Figs. 1, 3, and 4) and spring-urged into engagement with the edges of the spools 23, 28 'by means of springs 12, the ngers 10 being provided with suitable pads of material, such as leather. Preferably, the brake fingers are wide enough to engage the edges of both spool flanges in each case.

For the purpose of guiding the' manifolding ribbon R across the writing line there is provided the ribbon guide bar 15 (Figs. 1 to 4) which is attached to the side arms 16 by means of the of the bar -56 are the ribbon guide frames 18 in 7 whieh are :mounted :the a :ribbon iguide rollers .wand-.the vertical guide rollers .80. The ribbon vli. is led from tthezriehthand spool 28 for- Hardly y.and downwardly .around fthe 1-ight .hand 4.5'ro11er :1.8, thence crosswjse ofithe machine be.- tween :the 'rst two plies Aof vthe -rnanifold forms, then Y around the lefthandwertieal -roller 80 'back tothe right .b etvveenthe secondand thirdpliesof the. formssaroundfthe right handzrol-lers, thence back to the .left between :the third and -fourth plies, ...around the .left .hand 45 -,=roller 5I-9, vand thence on-theribbon spool 33. Thissallows'three working stretches .of the gribboneforfthepurpose of :making three .copies besides the copy made with the main .ribbon .l2 ;as shown in rFig.

For fthe purpose .for .guiding :the manifold stationery .to lthe :ribbons :there f'is-fprovideda series of adjustable guides .generally lrlesignat'edfi .(Figs. 1 to 1-3), :designed to-aecommodatefseveral different widths Tof-worksheet, wherebyitheoaek of manifold stationeryfinayibe'madeluplof-strips of :different widths. *This guiding -means is -ad justably mountedconthe paper vtablefBZ -whichfis mountedin the usual lway-onft-hestuds1flI. I'Any suita-hlaguidingfmeans may beused.

The side .farms -16 are nivotaily mounted/at -83 (Figsslfan'd) in the-plates 12m-each of which-is provided with-:ansoisetflug :20a-supporting the adjacent side .-,arm '16 :and engaged by -a rspringu-rged latch B4 .ipivoted-on: the adjacent side arm 16. 4The latchesili maylbe released toraise-the assembly including the bar'l15-and.-theside arms, 16 to carry 4.the 'ribbon 1R: up .from between the plies of stationeryfto facilitate the insertionfof forms.

JWhile *..tbere have f been .shown -and described and :pointed .outfthefundamentabnovel features of- .the i.nvenl;ion,y asf apnliedfto apreterred embodiment, it Will be understood that various-omissionsiand .substitutionsfandchangesin: therform and detailsof .the device illustrated-.andI in its-operation maybe lmade bythoselsizilled inf theiart without. departing ."fromA the spirit of the. invention. ...It is the intention, therefore, tofbellimited only-as indicatedsby. the scope of f-the'following claims.

What is ciaimedis:

1..A. ribbon .'mechansm.- comprising .a pair .of feed ratchets .pawls,r ,one for..4v each ratchet, for imparting rotationto A:said ratchets; apair. -of c0ntrol...members, one forfoach -ratchet Yand-its associated .pau/1, .said control fmembers having projections coacting with-.said :pawlsland capable of holding said pawls; Qllt.: of'. 4driving- `relatiorrto said ratchets; means ,interconnecting Isaid members including :1.a diierential gear-arranged so that movement of ,either;,rnember molle the related pewl. out of driving .relation 1witnits ratchet at the same time causes the-.othr-member to move toe-positionpermittinezthesother pawl to have driving :engagement with its ratchet; and ribbon. controlled. smeansf for selec.- tlvely moving Saidoontrol. membersdn alternation.

- 2.4 A ribbon mechanism .eomnrisinsre pair; of; feed retohets.: :feed rewlsf. one ioreaehl .orsaid retehets; e pair of control .elements .retainF ably mounted adjacent one -oflsaid wis-,and movable to alternate-positions the. adi' acent pawlis engaged-with and disengaged trom its associated ratchet..v respectively; including a reversingygeantrain. interconnecting said elements whereby rotation-voi. either .element to .one .alternate position@ engage itsnewl with @associated ratchet coemels. other-.element '1.5 the sonnet.

to amore `izo the other .alternate .position .to rvdisengage the ipawlior .said other element from the ratchet ior'saidother element, means for actuating said !pawls inunison, and ribbon controlled means foroausing theactuating means to move said 'elements f-to -their alternate positions .to thereby eiecta -reversal of the. ribbon.

3. In -oombination -with the carriage and platen .of .a typewritng machine, a cross shaft mountedin said carriage yparallel .with said platen,.a-.pairof ,ribbon -spoolsat -theends of .said platen .and coaxial with said shaft, .one of .said spoolsibeing fkeyedltofthe end of said -sliafvtmeans tosupport-and.g-uidefaribbcn between said-spools and'alongfthe-writing-:line.on the platen; a-.pair of feed ratchets, one fixed-to said-shaftadjaoent thefloose.spool andthe other-secured to theloose spoola spaceddistanceifrom -theratchet fixed .to

said ;shaft,l .-a .rock Jarm journaled on `said vshaft betweenrsaid ratehets, a -nai-r v4of Afeed -pawls oar.- riedlbysaid arm and coasting with-said ratchets, meansfto oscillate'said arm; a-p-air or pawloon.- trol `members journaled on said shaft, one on each .side -of saidvarm adjacent one of said ratchets, each of said control members being shapedl to l alternately engage `-and disensage `the pa-vlefor the l adjacent-ratchet Afrom said ratchet in twoaiternate--niovomentm ineens interconnecting fsaidacontrol members whereby, nwf-hen eitherl one-movesto aA positionl to A-engage its--paW-l with the .associated --ratchet, -the other -control member will be moved-to disengagethe remaining pawlfiromoits' ratchet-ymeansto causesad control members' to `-oscillate with. said arm, and means to -senseoexhaustionof the .ribbon-from said .spools and including elements engageable with said controlmembers, when a-spool becomes exhausted, -tdenable .an oscillation vof Ysaid arm to.-mo.ve theontrolme'mber for the exhausted spool. to -pawlcengaging .position .4.- Theinvention set-forth in .claim 3 in, which the. controlmembers.comprise a pair of ratcnets and ,the .interconnecting lmeans maintains Y the teeth .ofrsaidratchets in a staggered relation.

.-5.'.The. inventionset'forth in claim 3 inwhich thefcontrolmembers .comprise a .pair .of cams and the interconnecting means comprises .dilerential gearing.

.1.6. A. ribbon feed. mechanism comp-rising a pair of ribbon spools, means for feeding said spools including@ Deir of vI 'atohet and pawl devices, one foreach spool-; ;xneans for actuating the pawls of said ratchetand pawl .devices including an .oscillatable .armcarrying the, pawls of said devices; a .pair ,of ,eontro1 .members one for each; pawl, each member-,movable from a nav/l.A engaging .tota nawl-.disengasing position,.means interconneet- 111g Seide-members whereby movement of either nremberfao'. pa-,Wlsengag-ing position .causes the other :.iueniber @toi nove to :pawl diseneaeins nestionffmeass .normally Y compelling .saicl- .members to-:mavo withsaidarm in `its pavvl .driving moveeleatslwherebvesaidmembers mammie-she ensascdleefwl-iesnsesed position andthe disengaged cowl .iaidlseuseeedeositiom and means .to detect eahaastioneisaldribbon. spools-.includinsarresfnsemeeos operative-.when eitherl ribbon Snoollhecoillsseeheusted-to engage the control member; f erfathe exhausted spooland prevent saidflnembeafsala @moving with saidy ann .to therebyfefieet. Intimsof..-S..1.1ehmem.ber to rawl eldgngnim .Mira-Rd Othelxltmber tQPlWl Wgci@ .Fl-:.Theginveeiioaset in; eleim .fide-:Walsh .asseressmarnearelroaeselsead 10 the interconnecting means comprises means to UNITED STATES PATENTS cause said cams to move in opposite directions Number Name Date when either one is engaged by the arresting 1,075,996 Stickney om 14 1913 means. 1,162,689 Edwards et a1. Nov. 30: 1915 GEORGE F- MORRIS- 5 1,865,647 Shipley July 5, 1932 2,126,347 Ruttiman Aug. 9, 1938 REFERENCES CITED The following references are of record in the file of this patent:

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