US1459199A - Ribbon mechanism for typewriting machines - Google Patents

Ribbon mechanism for typewriting machines Download PDF

Info

Publication number
US1459199A
US1459199A US250314A US25031418A US1459199A US 1459199 A US1459199 A US 1459199A US 250314 A US250314 A US 250314A US 25031418 A US25031418 A US 25031418A US 1459199 A US1459199 A US 1459199A
Authority
US
United States
Prior art keywords
ribbon
carriage
shaft
spools
reversing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US250314A
Inventor
Foothorap Harry Arthur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELLIOTT FISHER CO
Original Assignee
ELLIOTT FISHER CO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US87721614A priority Critical
Application filed by ELLIOTT FISHER CO filed Critical ELLIOTT FISHER CO
Priority to US250316A priority patent/US1383096A/en
Priority to US250314A priority patent/US1459199A/en
Priority to US250315A priority patent/US1378672A/en
Application granted granted Critical
Publication of US1459199A publication Critical patent/US1459199A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers, thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/64Applications of scales or indicators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J33/00Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J33/00Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/003Ribbon spools

Description

June 19, 1923. 1,459,199
Y H. A. FOOTHORAP RIBBON MECHANISM FOR TYPEWRITING MACHINES Original Filed Deo. 1914 2 Sheets-Sheet 1 amoewlioz June 19, 1923.
1,459,199 H. A. FOOTHORAP RIBBON MECHANISM FOR TYPEWRITING MACHINES 1914 2 Sheets-Sheet 2 Original Filed Dec. 14
Suva wot Patented June 19, 1923.
UNETED srnras earner rrrc.
HARRY ARTHUR FOOTHORAP, OF HARRISBURG, PENNSYLVANIA, ASSIGNOR '10 EL- LIOTT-FISHER COMPANY, OF HARRISBURG, PENNSYLVANIA, A CORPORATION OF DELAWARE.
RIBBON MECHANISM FOR TYPEWRITING MACHINES.
Original application filed December 14., 1914,Seria1 No. 877,216. Divided and this application filed August 17, 1918.
T allwhomitmay concern:
Be it known that I, HARRY ARTHUR FOOTHORAP, citizen of the United States of America, residing at Harrisburg, in the 5 county of Dauphin and State of Pennsylvania, have invented certain new and useful Improvements in Ribbon Mechanism for Typewriting Machines, of which the following is a specification.
This invention-relates to a novel ribbon mechanism adapted more particularly for use in connection with machines of that type characterized by a stationary platen and downwardly acting printing mechanism.
The mechanism shown in the accompanying drawings is also shown and described in applicants Letters Patent of the United States No. 1,286,573, issued on an application of which this is a division. Only so much of the mechanism disclosed in said patent as is necessary to the understanding of the featuresof the invention claimed herein is shown and described in the present application. For a complete description of the mechanism herein shown and its associated parts reference may be had to said patent. v
The object of the invention, speaking generally is to provide an efficient and economical feed and ribbon reverse mechanism for a flat platen typewriter of the visible writing type.
Another object of the invention is to produce a ribbon mechanism of the specified character, including a novel efficient and inexpensive automatic ribbon feed, which receives th necessary power for its operation from the carriage propelling mechanism, and the primary elements of which are respectively carried by the escapement brackets.
Another object is to provide a simple and efficient automatic reverse for the ribbon, the reversing mechanism including setting means controlled by the ribbon to determine the subsequent operation of the reversing mechanism by power applied from the carriage propelling mechanism.
Still other objects of the invention will appear as the necessity for their accomplishment is developed in the succeeding deerial No. 250,314.
scription of the illustrated embodiment of the invention. To the accomplishment of the above recited objects and others which will more fully hereinafter appear, one embodiment of the invention resides in the construction Figure 2 is a plan view of the portion of the ribbon feeding mechanism, the adjacent structure being shown in dotted line.
Figure 3 is a longitudinal section'through the subject matter of Figure 1, but on a somewhat larger scale and with. the center broken out.
Figure & is a transverse section on the line 4-4: of Figure 3.
Figure 5 is a detail section on the line 55 of Figure 3. v
Figure 6 is a detail section on the line 6-6 of Figure 2. 1
Figure 7 is a detail prospective view of one of the setting devices for the ribbon reversing mechanism.
- Figure 8 is a detail view of one of the supporting brackets.
The machine to which my ribbon mechanism is shown applied is what is known as the Elliott-Fisher billing machine which is of that type in which the platen is stationary and above which moves longitudinally a line space frame supporting a carriage which is movable transversely of the platen to letter space the writing accomplished by a downwardly acting printing mechanism mounted on and movable with said carriage.
The typewriter carriage, the upper por tion of which is not shown, is provided with a bottom which constitutes a deck 2, below which is disposed a type ring 3 on which is mounted on a forwardly opening are a series of type bars (not shown). From the deck 2 adjacent to the opposite ends thereof, are suspended a pair of brackets 4, bifurcated to form bearing arms which are somewhat ofi'set, as shown in Figure 8.' The front arms 4 are designed for the support of the ribbon spools :5 and 6-, while the rear arms 4 serve as support for the ribbon feed shaft 7.- As the detail structure of the ribbon spools, and the means for guiding therihbonpast the printing point and from one spool to the other is not pertinent to this 'inventiomthe same is not specifically described.
7 It vhas beenstated that the IlbbOIl. feeding mechanism receives the necessary power for its operation. from the carriage propelling mechanism. For this purpose there is extended across the rear of the main machine frame, upon which the carriage travels, a feed rack .8, with which meshes the ribbon feed pinion 9, mounted on the ribbon driving shaft 10, which is a short shaft extended at right angles to the rack 8, and journaled in bearings 11, formed in the front and rear escapement brackets 12.
On the inner end of shaft 10, is a small worm gear 13 meshing with a somewhat larger worm gear 14 mounted on the ribbon feeding shaft 7 and designed to be clutched thereto when the ribbon is to be fed and to be released therefrom to effect the release of the ribbon during the retraction of the carriage or free forward movement thereof. The Wheel. 14 has a hollow hub 15 on one end of which is mounted a driving pawl 16 spring urged into engaging relation with the driving ratchet 17 fixed to the shaft 7 and having its hub extended into the hollow hub 15 of the gear 14, as shown.
Under normal writing conditions, the rotation of the pinion 9 by reason of its movement with the carriage while enmeshed with a fixed rack, will rotate the shaft-10 and through the Worm gears 13 and 14 will rotate theshaft 7 through the medium of the pawl 16 and the ratchet 17. This movement of the. shaft 7 is intended to be imparted .to one of the ribbon spools. The shaft 7 is therefore provided with reduced ends 18 journaled in bearings 19 fixed 'to and extended inwardly from the arm-s 4 of the bracket 4 and upon the exterior of these bearings 19 are mounted driving pinions20 meshing with the spool pinions 20 and having their hubs provided with crown ratchets 21, each of which forms one element of a clutch designated as a whole by 22'.
The two clutches 22 are designed to be brought .into action alternately to drive the ribbon spools in alternation. The other elementof'each clutch 22 is in the form of aglev er 23 having an annular central portion 24.which surrounds the shaft 7 and is fulcrumed'upon two opposed fulcrum screws 25 screwed into the ends of a lever supporting yoke 26 keyed or otherwise secured to the shaft 7.
At one end of the lever 23 is a tooth 27' designed to engage the teeth of the ratchet 21 and the opposite end 28 of the lever is of wound portion of the ribbon and designed to follow in toward the axis of the ribbon spoolas the ribbon is unwound therefrom for the purpose of presenting the reversing cam 29 into position to be engaged by the end'28 of the adjacent lever 23. When the cam is in such position, the rotation bf the shaft 7 will move the lever 23 along the cam which will swing the lever into engagement with the adjacent crown ratchet and thus clutch the adjacent driving gear to the shaft 7 to establish a driving connection between the depleted spool and the ribbon feeding mechanism.
The controlling device 30, consisting of the cam arm 29, follower arm 31 and connecting piece 32, is mounted to swing from a pin '33 having a knurled head 34 and mounted to rotate in a'bea-ring bracket 35 secured to the bottom of the carriage deck 2, a spring36 serving to swing the controlling device toward its active position as the resistance opposedto such movement by the ribbon wound on the adjacent spool is gradually withdrawn. The two clutch levers 23 are connected by a reversing bar 37 mounted to move in a longitudinal channel 38 in the shaft 7 and bent to. form a. lateral projection 39 engaging a. cylindrical shifter 40 mounted on the shaft 7 to rotate therewith but shiftable longitudinally thereof to move the reversing bar endwise in one direction or the other for the purpose of engaging one lever 23 and disengaging the ot ier.
The shifter 40 is formed with an annular groove 41 to receive a yoke 42 carried by the down-turned end 43 of a reversing rod 44 slidable in bearings 45 suspended from the deck 2. The outward end of the reversing rod 44 is formed with a handle or. head 46 exposed at one side of the machine for convenient manipulation by the operator when it is desired to effect the reversal of the ribbon feed by hand. To positively retain the clutch levers 23, the reversing bar 37 and shifter 40 in the position to which they are moved either by the automatic operation of the controlling devices or by the manual operation of the reversing rod, a. retaining device is provided. This device comprises a retaining spring 47 screwed orotherwise secured to t 1e shifter 40 and bent to form a catch 48 designed to engage either of two annular grooves it) formed in a collar 50 fixed to the shaft 7; To prevent reverse rotation of the shaft 7, the latter is provided with a. fixed ratchet 51, the teeth of which are spaced to correspond with the spacing of the carriage and engaging a pawl 52 carried by memes a relativelyfixed part, as shown in Figure 3.-
It'will now-be seen that as the carriage advance's, the engagement'of-the rack 8 and pinion 9, the formerbein stationary and the -latterincivable' with"t 'e"carria'ge, Wlll. effect the rotation of the ribbon feed shaztt 7 through the medium of the interposed gear ing and thus drive the ribbonspool whose clutch lever23 isin engagingposition', the opposite or disengaged spool being rotated independently by the ribbon being with-- drawn or unwound therefrom. Also, it will be seen that as such ribbon is unwound, it will permit the follower 31 of the adjacent controlling device 30 to approach the axisot the spool until the reversing cam 29 of said device is presented in position to be engaged by the tail 28 of the disengaged clutch lever 23.. During the next few advances of the carriage after this relation of the parts has been established will be accompanied by a continued feeding of the ribbon and by the shifting of the disengaged clutch lever into engagement, the simultaneous disengagement of the other clutch lever 23 being, of course, effected by the reversing bar 37. When the carriage is retracted, the ribbon feeding shaft 7 will not rotate because in the line of gearing between the feed pinion 9 and said shaft is interposed the pawl and ratchet 1 6 and 17. Therefore, while the pinion 9, shaft 10 and gears 13 and 14 will be rotated backward during the retraction of the carriage, the pawl 16 will move idly back over the ratchet 17' to avoid reverse rotation of any of the parts beyond the pawl. 'Any tendency of such parts to rotate will beefiectually resisted by the pawl 52.
It is also desirable to throw the ribbon feeding mechanism out of action and to thus discontinue the feed of the ribbon whenever the carriage is released from the carriage feeding mechanism, as, for instance, in jumping or skipping' the carriage from one point to another as in tabulating. This end is obtained by providing ribbon release mechanism which, in the present embodiment of my invention, is operated by the carriage release mechanism.
53 indicates the carriage release lever (sec Figure 1) fulcrumed in a bracket 54 suspended from the deck 2 adjacent to its rear edge and having at one end a connection 55 extending to the carriage release key not shown. The other end 56 of the carriage release lever (see Figure 2) is bent rearwardly to engage and operate the holding dog of the carriage escapement in a manner explained in my Patent No. 1,203,519 of October 31, 1916. cent to the connection 55, the carriage release lever 53 overlies the laterally deflected end 57 of the ribbon release lever. 58 fulcrumed in a bracket 58 dropped from the deck 2. The opposite end of the lever 58 is cohnected to one arm of a bell crank cam shifter Ad a- 59 fulcrumedi-n a bracket 60 and having-its other arm bifurcated'to engageanannular groove 61 formedin'fla cam 62 oi'atruncatedcone shape, mountedto slide longitudinallyontheshait and designed'to engage :anin cliiiedyfinger 63- extending-droniaplate. 64- secured to one side face of thepawl 16am]:
extended inwardly, or -toward the axis" of riage is released from the escapement by the operation oft he carriage release lever 53,
the ribbon releaselever 58 will be'swung to operate the cam 61 which will force the cam 62 under the finger 63 and thus lift the pawl 16 out of the engagement'with the ratchet 17. As long as the cam 62 is'retained'in'this position, the pinion 9, 1'3. and -14 will rotate idly with the pawl 16 ineffective and the finger 63 traveling upon the face of the cam 62. The ribbon feed shaft '7, of course; remains stationary and any feeding movement- 'of the ribbon is discontinueduntil'the operator relieves the pressure on the carriage release mechanism and permits the retraction there of and of the ribbon releasemechanism at which time the withdrawal of the cam 62 from the finger 63 will permit the pawl 16 to re-e-ngage the ratchet 17 and restore the ribbon feeding mechanism to 'operative condition.
What I'claim is 1. In a typewritenthe"combination with a movable carriage, ribbon spools'movab'le therewith and a feed "-shaft 'common'tosaid-k either spool with the shaft and ribbon release mec-hanlsm operative to render the gearing effective orinefl'ective todrive the shaft.
2. In a typewriter, the combination with a movable carriage," ribbon spoolsmounted; thereon, and a ribbon feed-shaft comm'onto both spools, of a'relatively fixed rack}. gearing between the 'shaft and raekavhereby the movement of the carriage will efi'ect'theroftation of the shaft, means for operatively connecting either oi -said spools with the shaft, ribbon release mechanism for rendering the ribbon feeding mechanism inoperatrve and carriage release mechanism ar ranged to operatedthe ribbon release mechanism to release the ribbon when the carriage is released for free movement.
tions, and servin 3. In a typewriter, the combination w th a movable carriage, ribbon spools and a ribbon feed shaft, of a relatively fixed rack, gearing between the rack and shaft and 1nl d ratchet ermittin reeluding a Paw an P g a able carriage and ribbon spools movtraction of the carriage without driving the shaft, a cam carried by the shaft to disconnect the pawl and ratchet, a cam shifter, a ribbon release lever for operating the shifter anda carriage release lever arranged to operate the ribbon release lever.
4. In a typewriter, the combinationwith a movable carriage, of a pa r of ribbon spools, ribbon feeding mechanism operated by the movement of t e carrlage and r1bbon controlled ribbon reversing mechanism also operated by the movement of the carriage 5. In a typewriter, the combination with a movable carria e and ribbon spools m ovable therewith, of ribbon feeding mechanlsm operated by the movement of the carriage, ribbon reversing mechanism also operated by the movement of the carriage and controlling means fo the ribbon reversing mechanism, said controlling means being in turn controlled by the ribbon wound on the ribbon spools.
6. In a typewriter, the combination with a movable carriage, of ribbon spools movable therewith, I'lbbOIl feeding and ribbon reversin mechanism movable with the carria e ans operated by the movement thereof an automatic means controlling the. operation of the reversing mechanism, and both manual and automatic devices controlling the operation of the ribbon reversing mechanism. i I
7. In a typewriter, the combination with a movable carriage and ribbon spools movable therewith, of ribbon feeding mechanism, ribbon reversing mechanism, a controlling device, movable to different posiin one position to cause the operation of t e ribbon reversing mechanism through the movement ofthe carriage. 8. In a typewriter,the combination wth a movable carriage and ribbon spools movable therewith, of ribbon feeding mechanism operated by the movement of the carriage, ribbon reversing mechanism operated by the carriage to disconnect one of the ribbon spools fromthe ribbon feeding mechanism and to connect the other spool to said ribbon feeding mechanism, and a controlling device coacting with the ribbon reversingmechanism in one position and having its position controlled by the ribbon wound on one of the spools.
9. In a typewriter, the combination with a movable carriage and ribbon spools movable therewith, of a ribbon feedin shaft rotated by the movement of the carnage, gearing between the ribbon feedin shaft and the spools, ribbon reversing mec anism including'clutches in the line of said gearing and resales able therewith, of ribbon feeding mechanism operated by the movement of the carriage, clutches controlling the operation of the respective spools by the feeding mechanism and-reversing cams coacting with the clutches through the movement of the carriage.
11. In a typewriter, the combination with a movable carriage and ribbon spools mov-.
able therewith, of means for driving theribbon spools through the movement of the carriage, clutches controlling the operation of the respective spools, reversing cams coacting with the clutches through the movement of the carriage to determine the spool to be driven and means coacting with the ribbon to determine the positions of the cams.
12. In a typewriter, the combination with a movable carriage and ribbon spools movable therewith, of a ribbon feeding shaft rotated by the movement of the carriage, a driving connection between each ribbon spool and the shaft, said driving connection including a clutch, one member of which is constantly rotatable with the shaft and a reversing cam movable into and out of position to be engaged by said clutch member as the feeding shaft rotates. v
13. In a typewriter, the combination with a movable carriage and ribbon spools movable therewith, of a ribbon feeding shaft rotated by the movement of the carriage, a pair of connected clutch members carried by and movable with the shaft, other clutch members geared to the ribbon spools and adapted to be engaged alternately by the clutch members first named and cams alternately coacting with the clutch members carried by the shaft and by reason of the rotation of said shaft.
1 1. In a typewriter, the combination with a movable carriage and ribbon spools movable therewith, of a ribbon feeding shaft movable with the carriage and operated by the movement thereof, clutches between said shaft and the ribbon spools, two of the clutch members being connected and mounted on the feeding shaft to rotate therewith and to move relative thereto into and out of engaging position, and a pair of independent ribbon controlled reversing cams each of which is movable into position to coact with one of the connected clutch members to move said member to' its engaging position as said member is caused to traverse the cam by the rotation of the shaft.
15. In a typewriter, the combination with a movable carriage and ribbon spools mov- Meeueo of clutch levers pivotally mounted on the shaft, a reversing bar connecting said levers, a pair of ratchet gears geared to the ribbon s 001s and disposed to be engaged by the c utch levers and a pair of controlling devices each including a reversing cam adapted to coact with a clutch lever and a follower coacting with the ribbon to determine the position of the cam.
16. In a typewriter, the combination with a carriage and ribbon spools, of bearings, clutch members rotatable on the bearings and geared to the spools, a ribbon feeding shaft journaled in the bearings, clutch mem bers mounted on the bearings, means for moving the last named clutch members into and out of enga 'n position and means for driving the she. t t rough the movement of the carriage.
17. In a typewriter, the combination with a carriage and ribbon s ools, of a ribbon feeding shaft, clutches or connecting the shaft to the spools, a 'reversing bar connecting the clutches and carried b the shaft, a shifter also carried ,b the s aft to move said-bar, driving mec anism for the feeding shaft and means carried by the shaft and controlling the connection of the driving mechanism therewith.
In testimony whereof I afix my signature in the presence of two witnesses.
HARRY ARTHUR FOOTHORAP. Witnesses: v
- J. F. Convnnwnm, MARSHALL H. DEAN.
US250314A 1914-12-14 1918-08-17 Ribbon mechanism for typewriting machines Expired - Lifetime US1459199A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US87721614A true 1914-12-14 1914-12-14
US250316A US1383096A (en) 1914-12-14 1918-08-17 Typewriting-machine
US250314A US1459199A (en) 1914-12-14 1918-08-17 Ribbon mechanism for typewriting machines
US250315A US1378672A (en) 1914-12-14 1918-08-17 Ribbon-spool for typewriters

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US250316A US1383096A (en) 1914-12-14 1918-08-17 Typewriting-machine
US250314A US1459199A (en) 1914-12-14 1918-08-17 Ribbon mechanism for typewriting machines
US250315A US1378672A (en) 1914-12-14 1918-08-17 Ribbon-spool for typewriters

Publications (1)

Publication Number Publication Date
US1459199A true US1459199A (en) 1923-06-19

Family

ID=27500352

Family Applications (3)

Application Number Title Priority Date Filing Date
US250315A Expired - Lifetime US1378672A (en) 1914-12-14 1918-08-17 Ribbon-spool for typewriters
US250316A Expired - Lifetime US1383096A (en) 1914-12-14 1918-08-17 Typewriting-machine
US250314A Expired - Lifetime US1459199A (en) 1914-12-14 1918-08-17 Ribbon mechanism for typewriting machines

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US250315A Expired - Lifetime US1378672A (en) 1914-12-14 1918-08-17 Ribbon-spool for typewriters
US250316A Expired - Lifetime US1383096A (en) 1914-12-14 1918-08-17 Typewriting-machine

Country Status (1)

Country Link
US (3) US1378672A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633362A (en) * 1946-12-31 1953-03-31 Armour Res Found Magnetic record player
US2775412A (en) * 1952-10-16 1956-12-25 Rca Corp Demountable film reel
US3508718A (en) * 1968-05-24 1970-04-28 Eastman Kodak Co Spindle for cartridge-loading motion picture projectors
US3568945A (en) * 1968-11-12 1971-03-09 Burroughs Corp Tape reel

Also Published As

Publication number Publication date
US1383096A (en) 1921-06-28
US1378672A (en) 1921-05-17

Similar Documents

Publication Publication Date Title
US1459199A (en) Ribbon mechanism for typewriting machines
US1127931A (en) Type-writing machine.
US933186A (en) Ribbon mechanism for type-writing machines.
US1570220A (en) Ribbon-feeding mechanism for typewriting machines
US933652A (en) Ribbon mechanism for type-writing machines.
US1417908A (en) Ribbon operating and guiding mechanism for typewriting machines
US896539A (en) Writing-machine.
US2068348A (en) Multiple copy typewriting machine
US1286573A (en) Ribbon mechanism for type-writing machines.
US1069149A (en) Type-writing machine.
US2304216A (en) Typewriting and like machines
US705523A (en) Ribbon-feeding mechanism for type-writing machines.
US1227847A (en) Type-writing machine.
US1839108A (en) Rotary platen typewriting machine
US1250408A (en) Type-writing machine.
US891047A (en) Type-writing machine.
US616888A (en) Type-writing machine
US1163580A (en) Type-writing-machine ribbon feeding and operating mechanism.
US1357194A (en) Typewriting-machine
US933181A (en) Ribbon mechanism for type-writing machines.
US470273A (en) George b
US2225340A (en) Typewriting and like machine
US886759A (en) Type-writing machine.
US1938728A (en) Reversible ribbon feeding mechanism
US938562A (en) Type-writing machine.