US1303159A - browning - Google Patents

Description

W. H. BROWNING. INK RIBBON FEED AND SIMILAR RivenssNG NEcHANlsN APPLICATION FILED APR.14. |917.

`Patented yMay 6, 1919-.

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W. H. BROWNING.

INK'RIBBON FEED AND SIMILAR REVERSING MECHANlSM.

APPLICATIQN FILED A'FR. 14. |917.

1',s03,1.59. Patented May e, 1919; l zsuEsTs-snesz.

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UNITED sTATEs `rArinrr OFFICE.

, Y wALTRfHEN'RY moslimwereld? wEMLEmfuNeIfA-im.

To all whom z'tmy concern.'

flBe v-it known-that "l, VEVVAL'."riii'z HN'RY BROWNING, a vsubjectlof-lthe King fof Great Bri-tain, residing in 'f MZeiiibley,England,have invented certain newf'and useful Improvements]infInkRibbon"Feed and Similar Reversing Mechanism, of 'which the ffollowi-ng bon feed orI like reversing mechanism of the type `described, wherein 'a sheet, strip or band is wound 'alternatelvabackward and forward 'from one reell'or drum on to another havingreversingV means comprising a nienrl ber, spring or' Weight-urgedl in onedirection, yand av secondfiiidependent member,y

' preferably Voperated by a-'noving part ofthe vapparatiis,urged' by a stronger'v springy or heavier weighty to engage said first member andur'ge it in the opposite direction'fand A means "governed -thefdiameters of said* reelsV or drums for regulating the movements. ofsaidmovable members;

f3The invention willbefully described Wit-l1 reference to the *f accompanying `r drawings Y which vshow the invention as to` a V ribbon feed for typewriters or the like.

jfEigure A1 is' a frontfviewofthe apparatus showing the parts in -the position for "wind- Athe ribbon lon one reel.

Fig. 12fis a"V similarview with the reels re-V moved, showing` the parts in Iposition" for winding-'the ribbon on tothe otherreel.-

Fig.` 3' is an undereside plan of "the `same parts inthe Vposition .shown in Figs-1.l

Ythe same positionf" l 1 Y Upon va 4suitable frame or base plate 1. are mounted .the spindlesy 'orlsh'afts' 2, `2a offithe ribbonreels 3, 3a, mounted freelylthereon,

which are each provided at theY inner endv with ratchet teeth 4R42, for the purpose of- 'd'riving them. Also mounted on 7)the-base* plateV f1 and adapted to be reciprocated longitudinally thereon ,isv ajslide which carries pawls 6, 6a, which maybe spring-urged Y as shown, adapted respectively Vto Yengage the rathets 4, 4a to drivel: them asthe' slide 5 is Y reciprocated, y means hereinafter Adescribed being yprovided to-`fprevent both'pawls engagig. if' is a part top planwith the parts in f .swam-@fion 0f Leftfsent-i latented May 1,6, Appucati'oariednprii'14,19131.*sentirai-162387.

for lr'eciproc'at-ingf theffdr'ivfing slide 5. As

shown a lpin 7 projects -throughthelbase plateliand iis'adapted to be engagedperiodicallybylsomelinoving part ofltheapparatus, arspr'ing l8`beii-1g provided'fto return itto norm-al position. l* ,"Hlso :suitably: -In'ountedfon the V'base plate l1 is-la bar Vor ithe flike l9-capable of limited lengthwise imovement thereon. As shown thekbar 9 is-mountedon Vthe -lstuds 10 its lengthwise movement thereon being limited by? meansvof #the length -of' the Vslots 11 through whichltheistudsflO pass. Aspring lftends.noi-iinall4 .todra'w the bar 9 toward the spindle -2 an =reel 3.

Upon lsuitable pivots 13, 13a` are freely pivotedriderst, 14a 'adaptedrtolridve lightly over thelsurfa'ce Aof vthe 4ribbon on' the reel and toberaised or lowered as the ribbon-is Wound? upon or Yunwound from the correspondingieel. vUpo'irthe same' pivots may 'befmountedj friction plates 15 -15a adapted tofcausefthe ribbonto be woundtightly". upon thefreels and to prevent undue rotation -of the' reels -witli looseness of the 1vribbon when vit islbeingunwound therefrom.A The friction plates 15, f15may be urged'agailiist ithe reelslby springs 16,1163,l andtsimilarxsprings mayvbe'employed withwtheriders 14, l@l if desired. flheibar 9-carries.pins'17, 17*L adapted accordingito theposition offthe bartofhold one orfother v of thepa-wls 6,. 6Pout of engagement with the corresponding ratchets et, lathe pin 17 engaginglfanarm 18 of thepawl 6,and the pin 17 `operating a cainplate 18a on the spindle 2a tohhold-thel pawl'a awayfrom the Y ratchet 4u. Fhereversingbar 9'isshownfin` is a second llongitudinally 1movable .Agbar 21- wvhich'yinay -alsofbe'inounted onthe studs 10. Thisfbar is vnormally' maintained drawn -toward'fthe -Y reel 3a l'byla spring 22 which may for convenience, as shown, be arranged be-V hind thebas'e plate 1,@a pin 23 secured tothe -bar 21 passing through a slot in the base plate for the purpose. Upon the front of the bar 21 is arrangeda pino'r `lug24 andA behind the reversing bar 9 is Va, corresponding pin 25 adapted to be normally engaged thereby. The spring 22 being made of greater strengththan the spring 12, the'tension of the spring 22'on the bar 21 normally overcomes that of the spring 12 on the revers- 'V eating the bar 21 and this, may be done by actuating the pin 26 at the back of the base plate 1 byA the same means as are employed to actuate the pawl bar or 'driving slide 5, the spring 22 causing the bar to return to normal Vpositionafter each actuation in the other direction. The reversing bar 9 under the action of its spring 12 is also ynormally caused to reciprocate with the bar '21.

The bars 9 and 21 are preferably. arranged so that their outer edges approximately eoincide with and are tangential to the maximum peripheries of the reels 3 `.and 3a sol thatas the reels unwind the edges oftheir riders are free unless otherwise prevented, to drop below the level of the edgesV of the bars 9j and 21 and as theyare wound lup the edges of the riders are gradually; raised above they edgessof said bars.. If therefore the rider14 iseXtended lengthwise so as to embrace the bar 9- andthe `rider 14aL is eX- tended to embrace the bar 21,-being formed so as to arch over the bar 9 iniallpositions, it is obvious that if suitably positioned slits or stops are formed on saidbars `or they are made of suitable length theriders may be caused as they are lowered to entersuch slits, engage such stops, or pass over the ends of the barsv and prevent their reciprocating movement. As shown the rider 14a is arranged to pass ov-er theend of the bar 21 and the rider 14 to engagea stop 27 on the bar ,9.l v A o 1 i v 1 Now supposing the.l position `ofthe parts to be as shown in Fig. 1, and the ribbon to, be just finished winding on to reel 3? from reel. 3, the rider 14a will be at its highest position and the rider 14-will drop to its lowest position (for the purpose for which the riders are employed they need notfollow the ribbon to the smallest diameter) -for when the bars 21 and 9 are, under theltension ofthe spring 22, together moved toward the reel 3L the rider 14 will drop past-the stop 27 Von the bar-9 and in this position it; holds the -bar 9 Vfrom moving back toward the reel'A 3. The bar 9 being held in this position in the manner above described mainratchet 4 of reel 3 and so to positively drive it. p i

It will be obvious that though bar 9-is *now locked there is nothing to prevent the continued reciprocation of bar 21. As, however, the ribbon is unwoundfrom reel 3"L the rider 14a lgradually drops until its edge falls below the level of the edge ofl bar 21 when, on a movement of said bar toward reel3V it will drop over the end ofthe bar and lock it in the position toward `reel 3.r Both bars vare then in thelocked `position and so remain for the time being. As the reel 3, however, becomes full the rider 14 is gradually raisedby the ribbon till, when the reel is quite full, it' is lifted outof engagement with stop 27 on the bar 9 which, seeing that the bar 21 is held toward reel 3, is itself free to move in the same direction under the impulse of spring 12. This movement of the reversing bar 9 reverses the pawls as above described and theribbon is again rewound on to reel 3a, both bars 9 v and 21Y meanwhile remaining stationary. When reel 3a is again full rider 14a is lifted from the end of bar 21, which is then, together with bar 9, vunder the impulse Vof the strong spring 22 moved toward reel 3a, and,

rider 14 being. allowed to drop,',bar 9 is again locked in this position and. again reverseswthe feed. And so the actionv continues, the reverse taking place each time one lof the ribbons becomes full. v

It is of course obvious that the bars 9fand 21may be placed anywhere withrelation to the reels or drums and their movements Ygoverned from the riders 14 and 14a bysuitable lever or link connections. Y According to the presentinvention asset out above, the-reversing rof the reels or drums is operated by a single vsetY of opposing' springs. We are aware, however, that it has been proposed to reverse'themovement of the ink ribbon of a typewriter by means of two pairs of opposing springs, one pair operating .with each ribbon reel. Such `an arrangement is entirely distinct from that herein described and necessitates complementary mechanism of anentirely different typefor its application. i i

Having thus described the lsaid invention and the best means I know ofv carrying the same into practical effect, I claim :-k

1. In apparatus having ink ribbon fand of pawlspivotally mountedvon the slide and adapted respectively to engage Athe ratchet-s to turn the reels alternately as the slide reciprocates, reversing mechanism for moving the paivls alternatelyV into and out of engagement with the ratchets, said reversing mechanism consisting of va movable member slldably mounted on the frame, a spring device tending to move Vthe member inl one di- Vrectlon, a second movable member slidably mounted on the frame and engaging the first movable member, a second spring device having an inherent power stronger than that of the first spring device and tending to urge the second movable member and the first movable member together in the direc' tion reverse tothe first said direction and means governed by the diameters of the said reels for regulating the movements ofthe said movable members.

2; In apparatus having ink ribbon and like feed mechanism of the type herein rey to turn the reels alternately as the slide reciprccates, reversing mechanism-for. moving the pawls alternately into and out of engagementivith the ratchets, said reversing mechanism comprising' a reciprocating mem-v ber, a reacting controlling device tending to move the member 1n one direction, a second reciprocating member which. normally operatively engages thev first member, Va second reacting controlling device having inherent power stronger than that of the first said reacting controlling device and tending to move the tvvo reciprocating members together in a direction opposite to the said first direction against the action of the rst said yreacting controlling device and' means for positively moving the saidsecond member periodically in the first-named direction against the action of its ovvn'reacting controlling device and means governed by the diameters of the ribbon reels for regulating the movements 'of the reciprocating members.` L f Y 3. In apparatus having ink ribbon and like feed mechanism offthe type herein Vreferred to, the combination of a frame, a pair of ribbon reelsV rotatably mounted on the frame, a ratchet device carried by eachreel, a reciprocating drivingY slide, a pair of pavvls pivotally mounted on the slide and adapted respectively to engage the ratchets to turn the reels alternately as the slide reciprocates, reversing mechanism for moving -ing the ratchets at the same time, said means comprising a reversing bar slidably mounted on the frame, means for moving the bar longitudinally in one direction to a terminal position, a reacting controlling device for moving the bar in the reverse direction to another terminal position, means carried by the bar, adapted, according to) the position of the bar, to holdv one or other of the said pavvls out of engagement With the corresponding ratchet, and devices governed by the diameters of the ribbon reels for regulating the actions of said reversing mechanism.

1l. In apparatus having ink ribbon and like feed mechanism of the type herein referred to, the combination of va frame, a pair of ribbon reels rotatably mounted on the frame, a ratchet device carried by each reel, a reciprocating driving slide, a pair of pawls pivotally mounted on the slide and adapted respectively to engage the ratchets to turn the reels alternately as the slide reciprocates, reversing mechanism for moving the pavvls alternately into and out of engagement Withthe ratchets, including means adapted to prevent both pavvls from engag ing the ratchets at the same time, said means comprising a reversing bar slidably mounted on the frame, means for moving the bar longitudinally in one direction to a terminal position, a reacting controlling device for moving the bar in the reverse direction to another terminal position, means carried by the bar, adapted according to the position of the barto hold one or other of the said pavvls out of engagement With the corresponding ratchet, riders resting upon the reels adapted to rise and fall as the diam eters of the reels increase or decrease, said `riders adapted t0 hold the reversing bar alternately and each respectively in one of its terminal positions till one of thereels is filled With ink ribbon or thelike, and devices governed by the diameters of the ribbon reels for regulating the actions of said reversing mechanism.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

` Washington, D. C.

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