US1721996A - Printing machine - Google Patents

Description

July 23, 1929. H. E. HUBBARD Err AL PRINTING MACHINE Filed Aug. 10, 1927 4 sheets-sheet 1 July 23, 1929 H. E. HUBBARD E-r AL 1,721,996

PRINTING MACHINE Filed Aug. l0', 1927 4 Sheets-Sheet 2 July 23, 1929 H. E. HUBBARD Erm. 1,721,996

PRINTING MACHINE Filed Aug. 10. 1927 4 Sheets-Sheet 5 July 23h, 19211 H.' E. HUBBARD -m. 1,721,996

PRINTING MACHINE Filed Aug. 1o. 1927 4 Sheets-Sheet 4 mm 11| mvNl. `m I Q I Patented July 23, 1929.

f nire FFECE." i

HENRY E. HUBBARD, OF CHICAGO, CECIL C. ILECGAIN, OF GLEN ELLYN, AND HERBERT L. THOMPSON, 0F ELGIN, ILLINOIS, ASSIGNORS, BY MESNE ASSIGNMENTS, TO AD- DRESSOGRAPH COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

PRINTING MACHINE.

This invention relates to printing machines of the kind which are adapted to print from a form through an ink ribbon, and its primary object is to provide a small, compact, portable, seltcontained and efficient machine `for printing cards, envelopes and similar articles.

Another objectvoi! the invention is to provide novel means for automatically moving the platen into impression position at the end of each complete operation of the machine, and for automatically moving the platen out of impression position at the beginning of each operation of themachine, and manually operated means for throwing said last mentioned means out of operation when an impression is to be made, so that the platen will travel in impression position above the form only whenan impression is desired.

Another object of the invention `is to provide novel means tor feeding the card or other article to be printed into printing position during the impression stroke ofthe platen carriage, and 'for ejecting the printed card from the machine during the return stroke oli the platen carriage.

And a further object of the invention is to provide novel means for feeding and reversing the ribbon.

In the accompanying drawing illustrating a selected embodiment of the invention,

Fig. 1 is a top plan view showing the carriage in initial position.

Fig. 2 is a transverse sectional view on the line 22 of Fig. 1. y

3 is a plan view partly broken away and in section showing one of the roller bearl11, 11 which arerevolubly and removably ings.

Fig. 4 is a sectional view on the line 4 4 of Fig. 3.

5 is a sectional View on the line 5 5 of Fig. 3.

Fig. 6 is a longitudinal sectional view on the line 6-6 of Fig. 1. y

Fig. 7 vis a transverse sectional view line 7-7 of Fig. 1. A f

Fig. 8 is a detail sectional view on the line 8 8 oi Fig. 1.

Fig. 9 is a detail view of a platen mounting.

Fig. 10 is a bottom chine. v

Fig. 11 is a top plan view ofthe carrying on the portion of the plan view of themaplate and dog slide detached from the mai chine. l

Fig. 12 is. a diagrammatic top plan view partly in section showing the ribbon feed and reversing devices.

Fig. 13 is a verticalv sectional view showing the ribbon feed and reversing devices.

Fig. 14 is a sectional view on the line 14-14 of Fig. 12.

Referring to the drawings the machine comprises a main frame 1 having a bed 2 to receive a printing plate 3. The printing plate may be of any 4suitable kind, one form being covered by the co-pending application of Henry E. Hubbard, Serial N o. 152,095, tiled December-2, 1926. The printing plateis pref erably made of a size to fit snuglyon the bed so that it will remain in fixed ing the printing operation. s

A skeleton ribbon frame 4 is pivotally mounted on a cross bar 5 at one end .of the main frame and it is provided with a spring position dur.

latch 6 at its other end to engage the main.4

bon frame in this position while the printing i f platel is being inserted or replaced'and to permit access to the ribbon mechanism vttor adjusting or replacing the ink ribbon.

The ink ribbon 10'is carried; on; two spools mounted in the -ribbon frame. The spools have driving engagement at fone end with ratchet wheels 12,' 12 and at their other endsl the spools engage projections 13 on end plates 14 carried by rods 15 inthe ribbon frame. A

spring 16 on each rod 15 normally holds the end plate in operativelengagement withV the spool. These spools are alternately supply Y i and takeup vspools depending upon whichv of the ltwo ratcliets -is engaged'by the feed de-` vices hereafter explained. vrlhe ribbon is drawn taut across the printing plate on the bed of the main frame and it is held free from n the plate, and caused to travel smoothly thereover without dragging on the plate, by curved can be removed and replaced. Any suitableprovision may be made for engaging the spools with the ratchets 12, a convenient means being the provision of projections 18 on the end of the spool to engage recesses 19 in the ratchet.

f Spring pressed posts' 20, Figs. 1, 8 are mounted inthe main frame toreceive the side bars of the skeleton ribbon frame when the latter is in closed position to hold' the ribbon frame under tension in proper working relation to thev other parts of the machine, to provide for wear, and to avoid the necessity for extreme accuracy of fit. These posts engage n the side bars of the ribbon frame about inidway between the ribbon spools.

roller platen 21 is inovably mounted in a carriage 22 which is provided with a handle 231v and is adapted to be moved back and forth along themain frame and over the ribbon y frame, from end to endY thereof. The carriage frame has depending side members 24,

' and roller bearing devices are engaged with these side members and travelin guide grooves 2511i the sides of the main frame, Fig.

` 7.v These roller bearings are shown in one 35,

form'which: we have found desirable for the pu-i'posein Figs. 3-5 and are more particularly described in the cor-pending application ofV Herbert L. Thompson, Serial No. 243,868, filedv Dec. 31, 1927. Briefly, these bearings comprise a solid body 2'6 having a raceway 27 1 for a plurality of ballsV 28 which are retained in thera'ceway by a shield 29. The shield extends around. the ends of the body and along the outer side thereof which isy located adj acent the side member of the carriage, and the balls are left free on the inner side of the body to engage the guide groove 25 in the main frame. The bearing has a straight inner side' and an inclined outer side, and that wall 30, Fig. 7 of thel side member of the carriagewhich engages the bearing' is also made inclined whereas the wall of the guide groove is, ofeoursastraight so that the wedge shapedy bearing can be forced snu'glyin-to place between thel side member ofthe carriage and the side wall of the main frame, in which position it will remain while the carriage is f being moved freely back and forth on the main frame. and noiseless and it enables the carriage to be moved easily and freely back and forth onV the main frame. f l

A. card guide 31,` Figs. 1, V6, is mounted on the carriage to receiveV a card to be printed.

and. this cardguide has'end bars 32 and 33.

The roller bearing is eflicientV The end bar 32 is slidably engaged in a slot in the ear 32 on the carriage `and the end bar 33 is slidably engaged with a slot in the ear 33 on the carriage so that the card guide may be moved crosswise of the machine and adjusted to receive and deliver the card in proper position relative to the form on the printing plate. rllhe end bar 33 has a slot 34 toreceive a screw by which the guide is secured rigidly in adjusted position. rEhe card is fed into the guide and against the platen 21 when the carriage is in initial forward position, Fig. 6. A bearing plate 35 is secured on the ribbon frame and projects over a portion of the ribbon and a portion e of the printing device on the bed. The platen l engages this bearing plate when it begins its rearward movement, to the right, Fig. 6, and this causes the platen to revolve. The card is fed in between the guide and the platen, and the revolving platen feeds the cardv under the platen. As the carriage proceeds upon its rearward travel the card is laid down by the platen upon the ribbon above the printing device and an impression vis taken by pressure of the platen against the card. A plate 36 is fastened to the ribbon frame at the Vend fthereof opposite the end of the frameto which the plate 35 is fastened, and yielding stop lingers 37 are secured onr the under side of the ribbon frame and project upward through openings 37 in the plate 36 to engage thev rear end of the card. rlhis plate 36 is cut to provide lingers 38 which are bowed between their ends and project above the top surface of the plate. On the rearward travel of the car'- riage, to the right Fig.V 6, the card is deposited in printing position and the impression is made.A The card now lies on the lingers 38 which lift the iear edge of the card" above the plate 36 when the platen is at the end of its rearward movement. It is desired to eject the card .from the machine on the return stroke of the carriage and for this purpose the carriage is provided at the front thereof with an ejector 39 to engage the elevated rear edge of the card over which it has just passed in its rearward travel and to push the card along as the carriage travels on itsfreturn stroke until the eaid is finally ejected from the machine at thefront end thereof.r TheV ejector is cut away as shown to vclear the stops 37 and the fingers 38. The' stops 'are on its return stroke above operative inipres.

sion positionso that it will not engagel and vyieldingly and providinga double faced cam for holding the platen in one or the other of its positions and suitable trip mechanism for shifting the'cam to position the platen. The roller platen`21 is freely mounted on a shaft '21','Figs 6, '7, which is relatively large in diameter and is provided with reduced ends 2l journaledin blocks 40. Each block has an upwardly projectingpin 4l. which engages a guide opening 4lin the side member of the carriage, and also a downwardl'yfprojecting pin 42 which engages a slot 43 in a pin 43 which is transversely mounted in the side member of the carriage. A spring 44 is arranged on the pin 42 between the block 40 and the pin 43 and the two springs 44, constitute a yielding support for the roller platen.

Each `pin 43 has a `socket 44 to receive theV end of the spring 44 and the engagement of the spring with this vsocket holds Vthe pin in its position in the side member of the carriage. Cams 45, 45 are rigidly mounted on the reduced ends Vof the platen shaft, Figs. 2, 7, and each cam has, two cam faces 46 and 47, the cam face 47 being higher vthan the cam face 46, Fig. 2, The cams also lhave feet 48, 48 which project down between the sides of the ribbon frame and the sides of the main frame. kA spring 49 is fastened on one side of the main frame in the path oftravel of the one foot 48' and it is arranged to'project' upward behindthe foot after the carriagehas reached the end of its return travel, 2. Flat spring plates 50 are secured at their' ends in the carriage frame and the cam faces `46,47 on the cams engage these spring plates which hold the cams against over-running when they are shifted back and forth, Set screws 51 inthe carriageframe may be set to adjust the spring platesy in proper position.. A spring retracted push rod 52 on the carriage, Fig. 2, isadapted to be operated by depressing the lever 53 to depress spring 49 so that it will not obstructfoot 48 in the rearward printing travel of the carriage. A notched shifter yrod 54 is held in" adjusted position by a spring 55, Fig. l, between a side of the main frame and a side of the ribbon frame, and it has an upturned end 56 in the path of the other foot In initial position of the carriage the cams and platen are in printing position,pFig. 2. lf an impression is to be made the operator manipulates lever 53 y,with thefthumb of his hand'which grasp'sthe handle 423 ofthe'carriage to'depress push rod 52 and spring 49 so that the foot 48 maypassfreely overl this spring. Thus lthe platen is permitted toremain in impression position vandf-an impression is made. When the otherfoot 48 strikes shifter54 the' cams and platen are shifted,

cam' faces 46V engage plates A50` andl -springs 44v lift the platen above impression position so that'the platen may travel back to initial position without engaging-the ribbongf As foot 48 'rides over spring 49 on the return 'travel of the carriage the resistance ofthe spring is lsuiiicient, to swing the cams and platen to impression position with cam faces 47 engaging plates 50. Thus the platen is set for printing everyV time it is returned to initial position; If an impression is not to be madeon the printing travel-of the carriage, thelever 53'is not operated, and thespring 49 obstructing foot '48 causesthe cams :to

swing until camfaces 46 engage'plates 50 which permitsfsprings 44y to liftv the platen above impression position'. Itis desiredto 'provide meansffor lautomatically'feeding andfreversing the ink rib'- bon during the use of the machine; Forthis purpose oppositely disposed feedd'ogs 56, 56, Fig. ll, are mounted ona carrying plate 57', whichis fastened'to the side membersof the carriage beneathlthemain frame.' -The dog 56 is adapted to engage and operate the ratchet Vl2, andthe dog.` 56I isfadapted l tof engage and'operate the ratchet 11125', Fig. 10. i But only one ofthesez dogs should operate'at .fa 'time' :to feed .the ribbon Y fromfone spool to the other and therefore the dogs are engaged with ay plate 58 which 'is' slidable back 'and vforthtransversely of the machine on the carrying plate 57.' Lips 59`are'struck from thecarrying Vplateto engage one edge ofthe slide plate,I lips 1 6() are v ystruck fromthe'slide plate to engage one edge of the carrying plate, and lips lare-struck from the slide plate to operate in grooves 6 1 in the carryingv plate. I lAlheaded stud 62 on the slide platefprojects` through and operates in "a lslot 62 in thecarrying plate'. l Thisstud.

is valsoemployed to secure the'spring plate '63 to the 'slide plate, theend'portions'gof the spring engaging' the dogs to.l hold them in operative relation to the teeth of the ratchets. Shifter levers 64, 65 are pivotally mounted on the underside of the main framein parallel relation. YThe lever 64 has on one end thereof a roller? 64 which operates in-engagement with the ribbon ony the spool 11', and Yat its other end it has a weighted cam 64 The lever 65 has at one end a roller-65 which operates in engagement with the ribbon on the spool 11,v and at its other end itha'sa weighted cam 65". Astud 66 on the underside of the slidemember is-arranged'to engage one or Y the other of thejcams`64, 65".

rEhe cam vend of the shifter lever64 'or `65 will be elevated whenever ther rollerr end engages a full. spool, and 'fthecam end Vwill be lowered when the roller end engages aniempty or nearly empty spool." .lNhen the ribbon has been nearly exhausted from one spool its shifter lever will have swung to carry its cam into. position to engage the stud Y 66, whereby the dog slide 58 is shiftedlaterally of the machine. Prior to this shifting operation a dog has been positioned to engage the ratchet of the' spool which has been functionv ing as a take-up spool to turn the spool a tooth of the ratchet at each operation of the carriage andthe other dog has been idle, but whentlie dog slide is shifted as described the other dog isbrought into position to engage the ratchet of the spool which before has been functioning as a supply spool and which now Vbeginsto function as a takeup spool, and

thereupon this latter spool is turned a tooth `of the ratchet at each operation of the carriage.` Thus a shifter lever is caused to operate by the supply spool when the ribbon has been nearly exhausted' therefrom, andeach ple and compact construction which embodies many ofthe desirable functions and operations of a highly organized printing machine of this type. VThe machine is designed primarily for printing cards from forms of different sizes and kinds but it may be used for printing envelopes and other articles Vwithin the capacity 'of the machine. The bed `may be made to receive printing plates of the kind described orit may be made to receive individual type or felectrotypes or other printing forms, as will be obvious to those skilled in the art. vThe machine is capable of comparatively rapidv operation, the cards` being fed into the guide with one hand while the carriageisl being opeiated by the other hand, and

since this is all themanual operation involved :itis` apparent that no particular skill is' required for operating the machine and that it is adaptable for general oilice use.

- We have shown and describedthe machine ina form which has been found commercial- .ly practicable, but we reserve the right to make any-changes therein as fall within the scope of the following claims.

`We claim:

` 1. A printing machine comprising a main frame, a bed on the main frame adapted to receive a printing.form,-a cross bar at one end' of the main-frame, a skeleton ribbon frame having slotted ears at one end to engage said bar for pivotally mounting the ribbon framev thereon, and a latch device on the other-end of the ribbon/frame arranged to engage the main frame for securing the ribbon frame to the4 mainframe. Y Y 'j Y 2. Aprinting machine lcomprising a main frame, a bed on the main frame adapted-to receive a printing form aribbon frame. movably mounted on the main frame, and. yielding means engaging the ribbon frame for holding the ribbon frame under tension when it is in operative position on the main frame. 8. A printing machine comprising a main frame, a bed on the main frame adapted to receive a printing form, a ribbon framelpivotally mounted at one end on the main frame and adapted to be detachablysseciired at its other end tothe main frame, spools mounted in the ribbon'frame at opposite endsfthereof to carry an ink ribbon which travels across the printing form, said spools being arranged below the plane of the form, and means o'n the bed at ythe ends'thereof for guidingthe vribbon in its travel. y A y v .4. A printing machine comprising a main frame, .a bed on the mainframeradapted to receive a printing form, a ribbon frame carrying a ribbon and mounted onl themain frame, a carriage arranged to travel' on the main frame, a roller platen carried by said carriage, 'means for automatically. lowering the platen into impression position as the car.- riage completes its return travel, and means for raising the platen .above impression positionV as the carriage starts on its printing travel. f

5.v A printing machine comprising a main frame, a bed on the main frame adapted to receive a printing form, a ribbon frame carrying a ribbon and mounted on thek main frame, a carriage arranged to travelon thermain frame, a roller platen carried by said carriage, means for automatically lowering the platen into impression position at the initial position of the carriage, means for raising the platen above impression position las the carriage starts on its printing travel, vand manually operated means for throwing saidlast mentioned means out of operative position.

l6. A printing machine comprisinga main frame, a bed on the main frame adapted to receive a printing form, a ribbon frameV carrying a ribbon and mounted on the main frame, a carriage arranged to travel on themain frame, a bodily movable roller platencarried by said carriage, means yon the carriage for raising and lowering the platen, a'pdevice on the main frame for operating said means to f .raise the platen above impression position as vthe carriage starts on itsiiinpression travel, and means on the carriagefor throwing said device out of operative position.

7. A printing machine comprising "ainain frame, -a bed on the main frame-adapted to receive a printing form,.a ribbon frame carrying av ribbon and mounted onthe mainframe, a carriage arranged to travel on the main frame, a bodily movableroller platen carried by saidcarriage, means on the carriage for raising and lowering thel platen, a `spring device arranged in the `path.o'funiovement of said means lto operate the same., and a manucamson said platen shaft each havingja foot,`

ally operable yplunger for throwing said device out o operative position..

8. A printing machine comprising a main frame, a bed on the main 'iframe adapted to receive a printing form, a ribbon frame carrying a ribbon and mounted on the main frame, a carriage arranged to travel on the main trame, a bodily movable roller platen carried by said carriage, means on the carriage for raising and lowering the platen, a shifter rod arranged on the trame in the path oi' movement ot' said means to operate the same, and means i'or adjusting said rod.

9. A printing machine comprising a main frame, a bed on the main trame adapted to receive a printing orm, a ribbon rame carrying a ribbon and mounted on the main frame, a carriage arranged to travel on the main rame,a bodily movable roller platen carried by said carriage, cam means or lowering the platen into impression position at initial position or the carriage, a movable device on the main frame arranged to operate said cam means as the carriage starts on its printing travel to raise the platen above impression position, and means :tor throwing said movable device out o1 operative position.

10. A printing` machine comprising a mainv iframe, a bed on the main iframe adapted' to receive a printing form, a ribbon frame carrying a ribbon and mounted on the main trame, a carriage arranged to travel on the main frame, a bodily movable roller platen carried by said carriage, means comprising a cam device for loweringthe platen into impression position at initial position or' the carriage, a movable device arranged in the path or movement of the cam device to operate the cam device for raising the platen above impression position as the carriage starts on its printing travel, a plunger or throwing said spring device out oi'- operative position, and a manually operated lever i'or depressing said plunger.

l1. A printing machine comprising a main frame, a bed on the main trame adapted to receive a printing form, a ribbon iframe carrying a ribbon and mounted on the main frame, a carriage arranged to ltravel on 'the main frame, a bodily movable rollerl platen carried by said carriage, a pair of cams on said platen each having a foot, a device on the main frame to engage the foot of one cam for shifting the platen out oi' impression position, and a device on the main frame toengage the foot oi the other cam for shifting the platen into impression position.

12'. A printing machine comprising a main frame, a bed onthe main'frame adapted to receive a printing form, a ribbon frame carrying a ribbon and mounted on the main frame, a carriage arranged to travel "on the main frame, a bodily movable roller platen carried by said carriage, a platen shaft, a pair of a device on the main frame to engage the'foot or one cam for shiftingl the platen out of impression position, a device on' the main frame to engage the foot of the other cam for shifting the platen into impression position, and means or throwing said last mentioned de.- vice ont of operative position. 4

13. A printing machine comprising a main frame, a bed on the main frame adapted t0 receive a printing iorm,'a ribbon frame car-A rying a ribbon and mounted on the main frame, a carriage arranged to travel oli-the ma-in frame, a bodily movable roller platen carried by said carriage, a platenshai't, a pair of cams on said platen shaft each havingja lowcam face, a high cam face and a foot, parts on the carriageto be engaged by said cams, and means on the carriage to engage said feet for shifting the cams to high cam position before the platen moves to impression position and to low cam position after the impression has been made to lower the platen into and elevate it above impression position. Y l

14. A printing machine comprising a main rame,'a bed on the main iframe adaptedto receive a printing form, a ribbon frame carrying a ribbon and mounted on the main frame, a carriage arranged to travel on the main frame, a bodily movable roller platen carried by said carriage, a cam device havinga low cam Vlface and a high cam face, apart Yon the carriage -adaptedfto be engaged by saidlcam faces for holding the campdevice in adjusted position, means for operating said cam device to throw the low cam face into operative engagement with said. part after an impression has been made, means for operating said cam device to throw 'the high cam face into operative engagement withsaid .part at the end of the return travelo'f the carriage, means i'orop'erating said camy device toy throw' the low cam lface into operative engagement with said part as the carriage starts on its printing travel, and means for throwing said last mentioned means out of operative position so that the carriage may proceed on its vprinting travel with the platen in impression position. 15. A printing machine comprising a main frame, a bed on the main frameadapted to receive a iprinting form, an ink vribbon lstretchedfacross the form, a carriage arranged to travel on the main frame, a roller platen `carried by said carriage, and means independent of the printing form for causing the platen to start thefeed of the article to be printed into impression position as the carriage moves on its impressiontravel. v

16. A printing machine comprising a main frame, a bed on the main frame` adapted to receive a printing form, jan ink ribbon stretched across the form, a carriage arranged to travel on the main frame, and a guide' on the carriage-to receive the article to be printed and guide it into position beneath 'the' platen and means on the main `frame independent of the form for imparting a rotative movement tothe platen before it engages the form so that the platen will feedthe article into impression Yposition as the carriage moves on its impression travel.

17. A printing machine comprisinga main frame, a bed on themain frame adapted to receive.. a printing form, an ink ribbon stretched across the form, a carriage arranged to travel on the main frame, a roller platen carried by said carriage, a plate arranged to engage the platen fat the bottom thereof when the platen is in initial position to cause the platen to revolvel when the carriage starts on its impression travel, and a lguide for guiding the article to bek printed Aunder the platen so tha-t'the'platQn will feed thev Varticle* into impression position as the carriage carries the platen through impression position.

18. A printing machine comprising a main frame,a bed on the main frameadapted to re: ceive a printing form, an ink ribbon stretched across the form, a carriage arranged to'travel. onr the main frame, a roller platen carriedby said carriage, means for causing the platen to feed'the article to be printed into impression position as the carriage carriesthe platen through impression position, and means on the carriagefor ejecting the printed article on thereturn travel of the carriage. 'v 19. A printing machine comprising a main frame, a bed on the main frame adapted to receive a printing form, an ink ribbon stretched across the form, a carriage arrangedy to travel on theA mainframe, a roller platen carried by said carriage, means forelevating the adjacent end of said article slightly above printing position after the platen moves thereover in its impression travel, and means onthe carriage to engage said elevated end of the article and for Vejecting the article from themachine -on the return travel of the carriage. v

20. A' printing machine comprising a main frame, a bed on the mainframe adapted to re ceive a printing for-m, a ribbon frame mounted on the mai-n frame, a carriage arranged to travel on the'main frame, a roller platen carried by said carriage, two spools mounted in the ribbon frame and carrying a ribbon which is stretched across the printing form, feeding means onfsaid spools, means carried'by the carriage for alternately operating the spool feeding means, and means controlled by the length of ribbon on a spool for operating said last mentioned means. L

21. A printing machine comprising a main frame, a bed on the main frame adapted to receive a printing form, a lribbon frame mounted on the main frame, a carriage `arranged to travel on the-main frame, a roller platen carried by said carriage, two spools mounted in the ribbon frame and carrying a `the other f spool.

ribbon whichis stretched across the printing and inoperative positions.

22. A printingmachine comprising a'main frame, a bed on the main frame adapted to receive a printing form, a ribbon frame mounted on themain frame, aV carriage arranged to travel on the main frame, a roller platen carried by said carriage, two spools mounted in the ribbon frame and 'carrying -a ribbon which is stretched' across the print! ing form, feeding means on saidspools, a plate carried by the carriage'. and movable transverselyy of the main frame, ay dog on said plate to engage the feeding means of-one spool Aand another dog on said platerto engage the feeding means of the other spool, andA means controlled by the length of ribbon Wound on one spool for automatically shifting said plate to carry the dogs into position'for winding the ribbonon 23. A printing machine comprising a-main frame, a bed on the main frame adapted to receive a printing form, a ribbon frame mountedy on'the main frame, a carriage arranged to travel on the main frame, a rolle-r platen carried by said carriage, two spools mounted in the ribbon frame andcarrying a ribbon which is stretched Aacross the printing form, feeding means on said spools, devices carried bythe carriage for operating said feeding meansfalternately, weighted levers pivoted on the carriage, means operated by the levers for reversing said feedingmeans, and rollers on the levers operating in contact with the ribbon on the spools.

24. A printing machine comprising a main frame', a bed on the main frame adapted to receive a printing form, a ribbon frame mounted on the main frame, .a carriage arranged to travel on the main frame, a roller platen carried by said carriage, two spools mounted in the ribbon frame and carrying a ribbon which is stretched across theprinting form, feeding means on said spools, a plate carried by the carriage and movable transversely of the mainframe, a dog on said plate to engage the feeding means of one spool and another dog on said plate to engage the feeding means of the other spool, levers pivoted on the carriage, weighted cams at one end of said levers, rollers at the other end of said levers operating in contact with the -ribbon on the spools, and means on the; plate adapted to be engaged by the cams for shifting the plate and reversing the ribbon feed. l'

25. A printing vmachine comprising a main frame, a bed on the main frame adapted to restud on the slide plate, eounterbalanced levers Ceive a printing form, a ribbon frame mountf pvoted on the main frame, rollers carried ed on the main frame, a carriage arranged to on opposite ends of said levers and engaging travel on the main frame, a roller platen earthe ribbon on the spools, and cams on the 5 ried by said carriage, tWo spools mounted in Weighted ends of said levers for engaging 15 the ribbon frame and carrying a ribbon which said stud and shifting said plate to reverse is stretched across the printing form, eedf the ribbon feed. ing ratchets on said spools, a slide plate car- HENRY E. HUBBARD. ried by the carriage, dogs on the slide plate i CECIL C. MCCAIN.

10 for operating said ratchets alternately, a HERBERT L. THOMPSON.

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