US896803A - Ribbon-feed mechanism for type-writing machines. - Google Patents

Description

Nd. 896,803. PATENTED AUG. 25, 1908.

E. B. URAM. RIBBON FEED MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED DEO.9, 1903.

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No. 896,803. PATBNTED AUG. 25, 1908.

, E. B. GRAM.

RIBBON FEED MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED DEG.9,1903.

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was m f a g I No. 896,803. PATENTED AUG. 25, 190s.

- y E. B. 0RAM. RIBBON FEED MECHANISM FOR TYPE WRITING MACHINES. APPLICATION FILED DEC. 9, 1903.

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- E. B. GRA-M.

RIBBON FEED MECHANISM EOE TYPE WRITING-MACHINES;

APPLICATION FILE?) 13130.9, 1903./ I 4 SHEB S SHEET 4 UNITED erm ne NT It).

EDWIN B. CRAM, OF BROOKLYN, NEW YORK, ASSIGNOR TO NEW YORK ADDING- TYPEWRITER COMPANY, OF ORANGE, NEW JERSEY, A CORPORATION OF MISSOURI.

RIBBON-FEED MECHANISM FORTYPE-WRITING MA CHIN ES.

Specification of Letters Patent.

Patented Aug. 25, 1998.

Application filed. December 9, 1903. Serial No. 184,452.

In such machines it is necessary'to move the ribbon over and away from the printing point as well as to feed the ribbon longitudinally from one spool to another.

. The objects of the present invention are to rovide mechanism for effecting the latera movement of the ribbon, said mechan ism bbing operated by the dog operating mechanism which controls the step by step movement of the pa er carriage; to provide mechanism for feecing the ribbon lon i tudinally, which mechanism is operated y the motor which moves sai carriage, and also to provide mechanism by which the longitudinal feed of the ribbon may be automatically reversed when said ribbon has been wound off one spool onto the other.

The invention will be fully described lle].'.

' inafter, reference being had to the accompanying drawings, in which Figure 1 is a top plan view of a portion of atypewriting machine with my invention applied thereto; Fig.2 is a side elevation partly in section; Fig. 3 is an elevation partly in section and partly broken away,

oking from the left of Fig. 2 Fig. 4 is a perspective view of the devices for moving the ribbon laterally, detached from the machine} Fig. 5 is an enlarged plan view of the cam shoe which engages the ribbon spools; Fig. 6 is a'detached detail view, enlarged, of the collarwith cam grooves in its periphery, which is employed to shift the gearing of the ribbon spools to reverse the direction of travel of the ribbon; Fig. 7 is a perspective view of a ribbon support detached.

The frame A of the machine is suitably constructed to support the operating parts.

including the carriage (not shown) upon which the usual cylindrical platen P is mounted, a ribbon R, rotatable ribbon spools S alternately driven from the rotatable shaft 453, which is also movable endwise t0 discon nect it from one spool and connect it to the other, means for shifting the shaft endwise,

shifting the, carria 'e in theusual step by step manner, movable ribbon supports 381 whereby the ribbon is moved over and away from theprinting point, a rock shaft 341 operatively connected to supports381 and also to the dog 247 forcontrolling the carriage movement, and a bail 334 for operating the rock shaft, extending transversely of the a motor E for driving the shaft 453 and also machine beneath the key levers or stems 3 00 of keys 35 (Fig. 2 shows one key and stem) for operating the typewriting mechanism (not shown), and adapted to be operated on the/ depression ofany of the keys.

Referring to Figs. 2 and 4, the bail 334 is provided with arms 327 which preferably aria integral with the bail and are pivoted on pins 329 supported by the frame A. Each arm has a tail piece 330 to which one end of a spring 328 is secured, the other end being secured to the frame. These springs hold the bail yieldingly in its elevated position against stops 331- projecting from the frame.

The rock shaft 341 turns in bearings on the frame, and an arm 345 is rigidly connected to said shaftnear one end thereof, and a bell crank lever is rigidly connected to said shaft near its other end. Links 336 connect the respective arms 327 with the arm 345 and the arm 340 of the bell crank lever. The other arm 349 of the bell crank lever is connected to a rod 348, the other end of which is con-,

neoted to the dog 247 for controlling the step by step movement of the carria e however, forms no part of the present invention and need not be particularly described or illustrated.

It is essential that the depression of the which,

bail shall be positive and uniform each time a key isoperated regardless of the position of formly througlnmt its length no matter at what point in its length the key .lever strikes it.

From each of the arms 340 and 345 a rod 376 extem'ls upwardly and is (ri'mneeted to an arm 354 of a hell crank lever, sai'd levers being pivotally supported on pins fixed. in the frame of the machine, one; on each side thereof. As the mechanism now to be described. is alike on both sides of the machine a descriptfim of that onone side will be suflicient. The other arm 355 of the bell crank lover is provided with a pin at its outer end extending through a slot 357 in a connecting bar 358. The other end of this bar is connected to an arm 360 rigidly secured to a rock shaft 367 which is supported in brackets 36 1 secured to the frame of the machine. To re vent endwise movement of the shaft, the lub 362 of the arm 360 bears against the bracket on one side, and a collar 363 rigidly connectthence under the roller ed to the shaft bears against the other side of of the bracket. Near the other end of the shaft 367 a collar 368 is rigidly secured upon the shaft and a spring 375 iscoiled on the shaft and connected at one end to the collar 368 and at the other end to the adjacent bracket 361, and the tendency of the spring is to hold the parts in the positions shown in Figs. 2 and 4; The collar 368 is provided with a lip 382 extending downwardly at an angle to the collar. I

Referring especially to Figs. 3 and 7, 381 is a ribbon support rigidly secured at one end J to the lip 382 andextending therefrom at an angle to bring its lower end in proximity to the platen P. The support carries a guide roller 378 forthe ribbon R at its upper end and another guide roller 385 at its lower end. The lower ends of the two supports 381 are .separated from each othera sufficient distance to permit the ribbon R to be carried into contact with the platen when struck by a type. The ribbon passes from one spool S under a guide roller 388, over the roller 378 and under the roller 385 of one support,

385 of the other support, over its roller 378, under another; guide roller 388, and on to the other ribbon spool. Secured to each support 381 are the thread ing clips 299 and298 to permit the ribbon to be placed upon the guide rollers within the clips but prevent it from accidentally-leaving the support. The springs 375 tend normally to hold the supports and ribbon away from the platen toward the front of the machine so that the printing may be seen. ,When a key is depressed, the bail 334 will move in a direction to swing the supports and ribbon over the platen and when the bail rises the springs 375 tend to return the supports and ribbon to normal position. It is not necessary or des rable t rat the ribbon be shifted from the printing point eachtime a key is released in rapid printing'and therefore the springs 3-75 are made of such strength th at an interval of time is required to moveitheribbon, the interval being such that there will be a very slight movement-of the ribbon during ordinary operation but if there is apause. the ribbon is shifted to reveal the printing point. To permit the carriage dog operating devices to return to normal position independently of the supportsand ribbon, a lost motion device between the dog and ribbon operating devices is provided, such as the slots 3-57 in, the connecting rods 358.

I will now describe the mechanism for feeding the ribbon longitudinally and for automatically reversing the direction of its food. The motor E is shown as having a spring actuated barrel 47 rotatable'upon a siaft 19 su ported in the machine frame, which barrel tion in the usual manner. An arm 54 is rigidly connected to the barrel 47 and carries at its outer end a pawl 409, the end of which is yieldingly held in engagement with the teeth of a ratchet wheel 59 bya spring 411.

,The ratchet wheel turns on the shaft of the spring barrel and a bevel gear 60 also mounted to turn onthe shaft is pinned to the moves the carriage in one direcratchet wheel so that both turn together.

.VVhen the barrel 0 crates to move the carriage to the left of t e machine, the pawl 409 will turn the ratchet wheel and gear 60 in the same direction as the barrel, but when the carriage is returned to the right of the machine to wind the spring barrel the pawl 409 will slip over the teeth of the'ratchet wheel 59.

The shaft 4-17 turns in bearings of a bracket 446 of the frame. The bracket 446 has an arm 422 which forms a bearing for the hub 431 of the bevel gear 432, whichlqub has a circumferential groove which receives a fork 455, Fig. 3, onthe arm 422, to prevent endwise movement of the hub. The hub also has a longitudinal slot 433 which receives a in 435 projecting from the shaft 453, which passes loosely through the hub 431. One end of the shaft 453 has a crank 441, thntthe shaft may be turned by hand when necessary; I

Each spool S is geared by gears 464, 465 to a vertical shaft 456, and gears 452 and 457, Fig. 3, at the lower ends of the latter engage gears 436 and. 460 on a horizontal rotating and sliding shaft 453, and this shaft is driven. from the motor E, shown as having a spring actuated'barrel 47 connected by a band to the platen carriage (not shown) as usual, the

said motor turning the shaft 453 through. the a medium, of a shaft 417 and gears 60 and 4.15 at one end and gears 449 and 432 at the other. When the gear 436 on the shaft 453 is engagedwith the, gear 452, the gear 460 will be disengaged from the gear 457, and vice Versa.

, It is necessary to provide some means for moving the shaft 453 endwise to effect the season reversal of the ribbon feed from spool to spool, and I prefer to have automatically operated devices, substantially like those to be now described.

On the shaft 453, near each end. a collarwhen one lever is ositively moved, as will be hereinafter descri ed, the other will also be moved to the same extent. Each lever 512 is guided at its lower end-by a slot 463 in a bracket 461 and at its upper end by a slot 412 Springs 520 are coiled around the shaft 453;between the collars 519 and the bevel gears 436 and 460 respectively. The ribbon spools are alike in construction and the devices for operatingthe levers 512 are alike on each sideof the machine, so it "will be necessary to describe one only.

Each ribbon spool has a 'core 483 preferably of wood, to which are attached the metal plates-484, in any suitable manner; The core is cut away to form arecess 497 and the shaft 474 passes through the plates 484 and the core, and is rigidly connected to them. The shaft 474 has a longitudinal groove 478 which communicates with the recess 497, and a rod 485 jhavin its ends bent at substantially a right ang e lies in the groove, and one bent end is connected to a sleeve 477 sliding on the shaft 474 and havinga cam 504 rigidly connected to it. The other bent endof the rod 485 hasa block. 482

securelyffastened to it, and this end of the.

rod projects beyond the block and forms a pin 480. The block 482-hes in the recess 497' 'of thes'pool core and it and the pin 480are normally covered by the ribbon on the-spool. The pin 480 maybe stationary and project beyond the recess at all times 'or itmay be movable and he normally withinsaid recess and be carried outward by the weight of the block 482 when the ribbon is unwound from the, spool. Normally the cam 504 is atone side of the lever 512', see. Fig. 2', and the cam, the spool and the shaft 474 may all turn together without acting on the lever.

For each spool there is a shoe'507 pivotally connected to the end of an arm 418 pivotally supported at its other end on a pin 498 which is fast in the frame of the machine, and v a spring 506 coiled onsaid pin, with one end connected to the frame and the other engag ing the'arm' 418,-hdlds the shoe yield'ingly Z Assuming-"n w that the ribbon is being.

wound on tethe spool at the left of Fig. 3

t and that the ribbon is attached to the spool tion;

on the right of Fig. S at cc and that there is still one layer of the ribbon on this spool, when the pin 480 has moved in the direction of the arrow to y, 3, there will be no ribbon between the sheet 507 and the pin 480; the latter will therefore enter the cam track 503, the block 482 bearing on the face of the. cam, and as the spool continues to turn, the pin 480 will traverse the cam track until it reaches the position indicated by .2 at which point the pin leaves the ram track. The track will cause the rod 485 to move endwise and carry the cam 504 behind the lever 512 and as the shaft 474 will still continue its rotation, it will act on said lever and .rock itto move the collar 519 to compress the spring 520 on the shaft-453. The spring 520 being compressed, it will tend to move the gear 436 and shaft 453, rigidly connected to it, to

the right in Fig. 3. This will operate to push a cam collar 427, which is fixed to shaft 453,

against a pin 425 projecting from the center" yond the other side of the collar, shifting the shaft endwise and moving the gear 436 out of engagement with the gear 452, and the gear 460 into engagement with the gear 457. VVhenthis has been accomplished the spool at the left of Fig. 3 will stop 'while the s ool on the right will be positively driven as ong' as the shaft 453 remains in theshifted posi When the empty spool begins its reversemovement the cam track 503 in the shoe 507 ,will act upon the pin 480 of the rod 485 and move the latter longitudinally to carry the earn 504 out of engagement with the lever 512, and as the spool continues its rotation and winds ribbon on it, the ribbon will come between the end 480-and shoe 507 and the earn 504 will remain inoperative until pin 480 is again uncovered. 'The shoes 507 in addi-' tion to their cam function also act as brakes for the spoolslto prevent them from overrunning, andthus keep the ribbon taut between .the spools.

At one end of the shaft 453 is a friction spring 421 supported by the frame and bearing upon sa'id, shaft to prevent its movement unless positively driven Without limiting myself to the precise constructionand arrangement of parts shown, I

claim 1. In a typewriting machine, the combi-- nation of a motor for moving the carriage, a .125

pairof ribbon spools, an 'endwise movable shaft rotated by said motor, gearing driven by. thesaid shaft for rotating said spools in-':

dependently, means automatically operate when the ribbon is unwound from one spool for impartinga' limited endwise movemenir to said shaft, and means operated by the rotation of said shaft for imparting a further longitudinal movement to said shaft to disconnect it from the gearing for rotating the filled spool and connect it with'the gearing for rotating the empty spool, substantially as setforth.

2. In a typewriting machine, the combination of a motor for moving the carriage, a pair of ribbon spools, an endwise movable shaft rotated by said motor, gearing driven by the said shaft for rotating said spools independently, means automatically operated when the ribbon is wound off one spool for imparting a limited endwise movement to said shaft, and a cam mechanism operated 'by the rotation of said shaft for imparting a further longitudinal movement to said shaft to disconnect it from the gearing for rotating the filled spool and connect it with the gearing for rotating the empty spool, substantially as set forth.

3. In a typewriting machine, the combination of a motor for moving the carriage, a pair of ribbon spools, an endwise movable shaft rotated by said motor, gearing driven by the said shaft for rotating said spools independently, a cam mounted on said shaft, a relatively stationary pin at the side of the shaft, and means automatically operated when the ribbon is wound off one spool for imparting a limited endwise movement to said shaft to bringsaid cam into engage- -ment with said pin, whereby as the shaft rotates a further longitudinal movement will be imparted thereto to disconnect it from the gearing for rotating the filled spool and connect it with the gearing for rotating the empty spool, substantially as set forth.

4. In a typewriting machine, the combination of a motor for moving the carriage, a pair of ribbon spools, an endwise movable shaft rotated by said motor, a collar on said shaft having a cam track in its periphery, a relatively. stationary pin, gearing adapted to be driven by said shaft for rotating the spools independently, and devices for moving said shaft endwise to engage the collar with said pin, whereby the shaft is further positively moved to disconnect it from gearing for r0.- tating one spool and to connect it to the gearing for rotating the other spool, substantially as set forth.

5. In a typewriting machine, the combination of a motor for moving the carriage, a pair of ribbon spools, an endwise movable shaft rotated by said motor, a collar on said shaft having a cam track in its'periphery, a

relatively stationary pin, gearing adapted to be driven by said shaft for rotating the spools independently, and springs-forv moving said shaft endwise to engage the collar with said pin whereby the shaft is further positively moved to disconnect it from gearing for rotating one spool and to connect it to the gearing for rotating the other spool, substantially as set forth.

6. In a typewriting machine, the combination of a motor for moving the carriage, a pair of ribbon spools, an endwise movable shaft rotated by said motor, a collar on said shaft havinga cam track in its periphery, a relatively stationary pin, gearing adapted to be driven by said shaft for rotating the spools independently, and devices automatically operated for moving said shaft endwise to engage said collar and said pin,

whereby the shaft is moved positively end-- wise to disconnect it from gearing for rotating one s'pool and to connect it to the gearing for rotating the other spool, substantially as set forth.

7. In a typewriting machine, the combination'of a pair of ribbon spools, a longitudinally movable power shaft adapted to be connected with either of said spools, a pin carried by each spool and normally covered by theribbon, means operated by said pin when it is uncovered for imparting a limited longitudinal movement to said power shaft, and means operated by the rotation of said power shaft for imparting a further longitudinal movement thereto to disconnect one of the said spools from said shaft and connect the other of said spools with such shaft.

8. In atypewriting machine, the combination of a pair of ribbon spools, a pin car ried by each spool and normallycovered by the ribbon, a cam shoe adapted to engage with said pin when it is uncovered, means for rotating said spools independently, and means operated by said cam shoe and pin for disconnecting one of said spools from its rotating means and connecting the other of said spools to a rotating means, substantially as set forth.

9. In a typewriting machine, the combination of a pair of ribbon spools, a ower shaft common to both spools and mova le to' nation ofa pair of ribbon spools, a power.

shaft'common to both spools and movable to engage the driving devices of either spool, means adapted to be automatically operated when the ribbon is unwound from either spool for imparting a limited shifting movement tosaid power shaft, and means operated by said power shaft for continuing such shifting movement to disconnect said shaft I from the driving devices of onev spool and connect it with the driving devices-of the other spool.

In a typewritin machine, the combi natlon of a pair of n bon spools, a power shaft common to both spools and movable to engage the driving devices of either spool, a

spring adapted to be put under tension by the unwinding of the ribbon from one of the spools to cause a limited movement of the connections between the power shaft and spools, and means operated by said shaft for contlnuing such shifting .movement to disconnect said shaft from one spool and con-' nect it with the other spool.

12. In a typewriting machine, the combination of a pair of ribbon spools, devices for rotating each spool including a bevel gear connected with the spool spindle, a power shaft, bevel gears on said shaft adapted to mesh with said spool spindle gears, means controlled by the ribbon for imparting an initial shifting movement to the power shaft, and means for positively continuing such shifting movement to disconnect one of the gears on said shaft from the associated spool -spindle gear and connect'the other gear on said shaft with the other spool spindle gear.

13. In a typewriting machine, the combination 'of a pair of ribbon spools, a longitudinally vmovable power shaft adapted to be connected with either of said spools, springs connected with said shaft, means adapted to be operated by either spool when the ribbon is unwound therefrom for putting'one of said springs undertension and causing said spring to move the power shaft longitudinally, and means operated by the power shaftfor continuing such longitudinal movement of said shaft to disconnect one of said spools therefrom and connect the other spool therewith.

14. In a typewriting machine, the combination of a pair of ribbon spools, a longitudi-Y nally movable power shaft, gearing adapted to connect said shaft with either ofthe ribbon spools, two springs surrounding said shaft and each connected therewith at one gitudinal movement thereof to disconnect 15. nation of a pair of ribbon spools each having end, means adapted to be operated b either spool when the ribbon is unwoun from for compressing one of said springs and thereby moving the power shaft longitudi nally a limited distance, and means operated by the power shaft for continuing such 'l'on oneof the spools 'therefrom and connect the others 001 thereto. I g I n a typewriting machine, thecombia core provided with a recess, a ribbon connected at. its ends to the respective cores to be wound thereon to close said recesses, gear ings for rotating said's ools independently, a motor, a shaft for our spool having a longitudinal groove communicating with the re ces's in the core of its spool, a rod sup orted' I in saidgroove and movable endwise t erein,

a weightlon one end of the rod,"norn 1ally sup-- ported in said recess by the ribbon wound on there-.

nation of a pair of ribbon. s'plools each having a corewith a recess and a s aft having-a longitudinal roove communicating with said recess, a ri bon. connected to'said cores to be wound thereon and to close said recesses, means for rotating said spools in opposite di-- rections, a rod supported in the groove in the shaft and having a weighted pin at the end in said recess normally retained therein by' the ribbon, and means operated by the movement of said rod when its pin is released 'for reversing the. direction of feed of the. ribbon, substantially as set forth.

17. In an automatic devicefor reversing the feed of typewriter ribbons, a pair of spools, each having a core with a recess and a s aft having a roove communicating with said recess, a rib on connected at its ends to said cores to be wound thereon, a rod sup-- ported in each groove-and movable'lo'ngitudinally therein and having a pin at its end,

cess'es by the ribbon on the cores, cam tracks said pins bein normally retained in the rea to iceivethe respective pins when released by the ribbon, to move the respective rods endwise,'and means operated by the movement of one of the rodsfor reversing the direction of feed of the ribbon, substantially as set forth. I

18. In a typewritin machine, the combi-' nation of a pair of spoo s each having a shaft,

-a cam su ported on the shaft to rotate therewith an move longitudinally thereof,- a driven shaft having endwis'e movement, gears 452, 457 for rotating said spools inde-' pendently, means for gearing said gears alternately withthe driven shaft, a pair of levers connected at their lower endsto' the driven shaft, and their other ends being respectlvely adjacent to the respective cams on the spool shafts, and devices automatically operated for moving said cams alternately into engage ment with said levers whereby each in turn is o erated to move the driven shaft endwise an disconnect it from the gear for rotat ng one spool and connect it to that for operating the other spool, substantially as set forth; 19. In a ty ewriting machine, the comb1 nationof a saft 453 supported to turn in bearings and move endwise therein, and having two separated bevel gears fixed thereon, a

pan". of sh'aftsj456 extending at ri ht angles .to the shaft 453, each having a evel gear aptb6 eng ged-by one of the bevel:

gears on the shaft 453, a pair of ribbon spool gearings between the shafts 456 and the respective spools for rotating the latter, a cam collar fast on the shaft 453, a relatively'stationary pin adjacent to said collar, a movable collar on the shaft 453, a spring inter posed between said movable collar and a fixed projection on the shaft 453, means for actuating the movable collar to move the shaft 453 and hold the cam collar elastically against said pin, and means for rotating the shaft 453, substantially as set forth.

20. In a top strike typewriting machine, the combination of a platen, two ribbon supporting arms mounted on rock shafts arranged to rock about an axis extending longitudinally of the platen, means for normally holding said arms in position to expose the printing point on the platen, a universal bar, and connections between said" bar and the shafts of the ribbon sup orting arms whereby said arms will be roc ed to move the ribbon over said printing point whenever a key of the machine is o erated.

21. In a top strilie typewriting machine, the combination of a platen, two rock shafts mounted in suitable bearings above the platen, a ribbon supporting arm secured to each of said shafts,

pose the printing point on the platen, a universal bar, and pin and slot connections between arms on said rock shafts and devices movable by the universal bar, substantially as and for the purpose described.

22. In a top strike typewriting machine, the combination of a platen, two ribbon supporting arms mounted on rock shafts arranged to rock about an axis extending lonbar, and connections gitudinally of the platen, springs for acting to hold said supports in position to expose the printing point on the platen, a universal between said bar and the shafts of the ribbon sup orting arms whereby said arms will be roe ed to move the ribbon over said printing point whenever a key of the machine is operated.

23. In a typewriting machine, the combination of a platen, an inking ribbon, pivotal supports through which the ribbon passes, means for normally'holding said supports and ribbon away from the platen, a pivotally supported ball adapted to be depressed by any key of the typewriter, a rock shaft supported below the bail, arms rigidly connected to the rock shaft, rods connecting the ends of the bail with the respective arms, and connections between the arms on the rock shaft and the respective ribbon supports, whereby means for normally holding said shafts and arms in position to ex-' nation of a p when any key is depressed to depress the bail the supports will be moved uniformly to bring the ribbon into printing position over the platen. A

24. In a typewriting machine, the combinationof a depressible bail having arms at right angles thereto, said arms being pivot-' ally supported, springs for normally holding the bail elevated, a rock shaft below the bail, arms rigidly connected to the rock shaft, rods connecting the respective bail arms to the respective arms on the rock shaft, a platen, an inking ribbon, supports through which the ribbon passes, independent rock shafts to which the supports are connected, springs tending to hold the supports and ribbon away from the platen, a bell crank lever on each side of the machine, rods connecting the said levers with the respective rock shaft arms, an arm on each support, and rods con-- nected at one end to the respective supports and having a slot and pin connection at their other ends to the respective bell crank levers, whereby when the bail is depressed the supports and ribbon are moved toward t 1e platen, and the bail can return independently of the return of the supports and ribbon, substantially as set forth.

25. In a ty ewriting machine, the combiaten, two rock shafts, ribbon supporting arms mounted on said shafts, springs extending around said rock shafts and acting to hold the ribbon supporting arms in position to expose the printing point on the platen,- a universal bar, and connections between said bar and rock shafts where by the ribbon supporting arms will be shifted to move the rib on over said printing point whenever a key of the machine is operated.

26. In a typewriting machine, the combination of a platen, two rock shafts, ribbon supporting arms mounted on said shafts, and extending beyond the adjacent ends thereof, springs extending around said rock shafts and acting to hold the ribbon supporting arms in position to expose the printing point.

on the platen, a universal-bar, and connections between said bar and rock shafts whereby the ribbon su porting arms will be shifted to move the rib on over said printing point whenever a key of the machine is 0perated. i

In testimony whereof I have signed my nameto this specification in the presence of two subscribing witnesses.

' EDWIN B. CRAM. Witnesses: I

W. FRANK CARTER,

WM. G. MCCARTY.

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