US1422617A

US1422617A - Typewriting machine

Info

Publication number: US1422617A
Application number: US459902A
Authority: US
Inventors: Phelps Joseph
Original assignee: Remington Typewriter Co
Current assignee: Remington Typewriter Co
Priority date: 1921-04-09
Filing date: 1921-04-09
Publication date: 1922-07-11
Anticipated expiration: 1939-07-11

Description

J. PHELPS. TYPEWRITING MACHINE. APPLICATION FILED APR. 9, 1921.

PatentedJuly l, 1922;.

2 SHEETS-SHEET I.

WIINEEEEE HIE ATTIJRAIEY" 1. PHELPS. IYPEWRITING MACHINE. APPLICATION FILED APR. 9.1921.

L'422,6 l 7 Patented July 11,1922;

SHEETS-SHEET 2.

WITNESS-E5 hENTER 'f 5% 71M HIE ATTRNEY A'ithl'l" @FENCE Josnri Pannes, or NORTH CALDWELL, ifrnw Jnnsnr, Assiettes To REMINGTON TYPWRITER COMPANY, or ILrON, nnwom, A conronaron or NEW YORK TYP'WRITING MACT-IINE.

Liaaeia.

Specification of LettersPatent.

Patented. July lil, 192.2.

Application filed .April 9, 1921. Serial'No. A459,902',

My present invention relates to ribbon v mechanism tor writing machines and the chiel; object ot said invention is to provide new and improved devices for reversing the ribbon feeding mechanism or controlling it as to reverse the direction in which the ribbon is ted. My invention is designed as an improvement on the ribbon'reversing mechanism disclosed in the application ot Edwin E. Barney Sr.. No. 456,907, tiled March 80, 1921.

To the above and other ends which will hereinafter appear my present invention consists in the 'features of construction, combination ot' devices and arrangements ot parts hereinafter described and particularly pointed` out in the claims.

L ln the acompanying drawings which illustrate the preferred form ot my invention,

Fig. il. is a 'fragmentary transverse vertical Vsectional view ot parts-ol1 a typewriting machine embodying my invention.

Fig. 2 is a Jfragmentary vertical sectional vview taken axially through one of the ribbon spools.

Fig. 8 is a horizontal sectioi'ial view taken on a plane indicated bythe dotted line l-l in Fig. 2 and looking downward in the direction oit the arrow at said line.

Fig. 4 is a horizontal sectional view taken on planes indicated by thefdotted line 2 in Fig.- 2 and looking downward'in the direction of the arrow at said line.

Fig. 5 is a horizontal sectional view taken on a plane indicated by the dotted line 3 in fllig, Qand looking d'ownard in the direction oi.' the arrow at said line.

Fig. G is a fragmentary side elevation illustrating some oi' the parts as they appear when viewed from'the right-hand side oit the machine.

The typewriting nia-chine to which my invention is shown as applied corresponds with that disclosed in the aforesaidy application 'of Edwin Barney. and reference may be 'ni-ade to said application li'or a more complete disclosure yotsaid machine', only such parts o' the machine being illustrated herein as are necessary to a proper understanding ot my invention.' The main frame of the machine comprises side trame parts or plates l which are suitably connected together and are surmounted by a top plate comprising sections 4. Above the top plate is arranged a platen 5, diagrammatically illustrated in Fig. l, and which is mounted on a. carriage that is adapted for movement or travel transversely of the machine under the control of suitable mechanism. Printing key loyers 6 are connected with and are adapted to actuate printing instrumentalities (not shown) which co-operate with the front or printing face of the platen 5. Each top plate section 4 is cut out or formed with an opening indicated. Iat 25 which is, bounded by an upturned edging or tia-nge 26, the top edges ot the two lianges being inclined upward and inward toward each other. Said flanges provide housings or cups for ribbon spoolsiQT, each ribbon spool comprising two parallel heads or flanges 28 and a core piece 29. the 'flanges being provided centrally with holes to lit'over the supporting shafts. A. ribbon 30 is wound on the ribbon spools and -trom each is led inward toward the printing point through slotways 8l in the housings 26, the unwound portion of the ribbon being` threaded midway between the spools through -the slots of a ribbon vibrator or carrier 32,

said vibrator normally nmiutaining in the printing portion of' the ribbon below the printingpoint on the platen but being adapted at'each printing operation to rise and interpos'e the ribbon between the platen and the operated type bar. Each ribbon spool is detachably mounted on a ribbon spool' shaft 42 that is supported on a detachable bracket or casting 43. There are two ot'these brackets or castings arranged one at each side ot thel machine inside the side plates to which said brackets are secured by pairs ot screws 44. The brackets 43 herein illustrated differ from the brackets of theatoresa'id Barneyl application. Sr. No.

.456907. in that they are symmetrical to a vertical line or axis passing midway between the attaching screws 44. as will be clear trom an inspection of Fig. 6. The advantage ot this symmetrical construction over the prior construction is that the brackets herein are interchangeable; that is. the bracket' shown at the lett may be applied to ates with the bearing opening in the the right-'hand side of the machine, and the right-hand bracket may be applied to the left-hand side of the machine without interfering with the proper functioning of the ribbon mechanism, the brackets being eX- actly alike and the parts being mounted on them in identically the same way. On the other hand, with asymmetrical brackets, as in the prior construction, it is always nec'- essary to apply the brackets at the sides of the machine for which they were intended, thel left-hand bracket not being adapted to the right-hand side of the machine, and the rightfhand bracket not being adapted to the left-hand side of the machine. Each of the present interchangeable brackets 43 comprises an inclined body portion 46 and

projections

47 and 48, the upper projections being formed with bosses 49 perforated to provide bearing openings for the associate ribbon spool shafts 42. The lower portion `42a of the shaft 42, which` portion co-oper boss 49,

is of lesser diameter than the upper portion .and is formed with a shallow circumferential groove 42b which receives the pointed or inner end of a headed screw 42c that lis threaded into the projection 47 from the side (Fig. 5). The length of said screw is such that whenit is fully screwed in, its inner end while it. will enter to some extent the groove or depression 42b it will not contact with the bottom of said groove. The construction is such, in other words, that while the spool shaft may turn freely in its bearing it cannot be displaced endwise or withdrawn from said bearing until the retaining screwl 42C is unscrewed to an extent suiiicient to clear the groove 42h. When the screw is thus withdrawn, however, the shaft 42 and the parts mounted or supported y thereon readily be withdrawn or de- `cated at 55. the

tached. Said parts include for each shaft the associate ribbon spool itself, said spool .being detachably secured to the shaft by devices comprising a latch or lever 54. Said latch is arranged in a slot or cutaway indil pivot 56 of said latchbridginggsaid slot. [The upper portion of the slot passescompletely through the head of .the shaft and receives lugs 28ll projecting inward from the upper flange of the ribbon spool,the lower end of the latch 54 co-oper- `ating with'the lower flange of the ribbon spool to prevent upward displacement of the spool relatively to the shaft. The latch is maintained in operative position by a coiled spring acting against it below its pivot. A ttached to the spool shaft 42 below the ribbon spool is a circular support or plate 58 secured to the top face whereof is a rib- Said sp,r1ng .comprises a body portion or main. arm thc-end of which is riveted or other- .Wise .Secured te the supportS near its. pe-

riphery, the opposite end of the body portion being formed with an eye or annulus which loosely embraces the associate ribbon spool shaft. Projecting from the eye 60 diametrically opposite from the arm 59 is an angular extension or tongue 59a which is off-set downward and terminates in an outward projecting tip 59". The tendency of the

spring

59, 60 is to stand away from the supporting disk 58 as illustrated in Fig. 2, but when the ribbon spool is in place this tendency is overcome andthe spring is held substantially flat against the support, the spring at this time maintaining the lower flange of the spool pressed up into engagement with the lower end of the latch 54. vWhen said latch is operated to release the

ribbon spoolthe spring

59, 60 becomes effective to lift the spool far enough to carry its upper flange above the top edge of the cup or housing 26, thus enabling the operator readily to grasp the spool and remove it from the cup. It will be observed from Figs. 2 and 3 that the eye portion 60 of the spring is slightly bent at diametrically opposite sides on a line passing through the axis of the shaft, as indicated at 60a. The bends or edges 60a being slightly above the upper plane face ofthe spring will cause contactive action of the spring against the spool along said edges so that the lifting force of the spring will act substantially axially of the spool shaft, this construction tending tol promote an even lifting or raising ofthe ribbon spool from its seat or bed. The lifting

spring

59, 60 has also an additional function to be hereinafter referred to. The plate 58 is perforated to fit-over the hub 62 of -a small gear wheel 63 comprised in the ribbon feeding mechanism, said gear wheel being secured to the spool shaft by a pin 64 which passes through the hub 62 at one side of the opening therein, and so as to cut into the face of the spool shaft at one-side of its axis as will be clear from Fig. 2. This permits the slot 55 to be extended downward below the plane of the cross pin without cutting the latter. The slot, as will be observed from Fig. 2, is thus left clear and unobstructed through fthe full width of the gear wheel 63 and its vupper end of a feed shaft 67, said shaft bearing near its upper end in the projection -47` i of the associatefbracket 43. The feed ,shaftflextends vdownward 'and near its lower ii (l adam* and are fixed thereto.

end bears in the projection 4:8, which is slottef as indicated at 68 to receive a collar 69 fixed to the shaft to prevent endwise displacement thereoi" but without interfering with its rotation. Each shaft 6'? carries at its lower end a beveled pinion T1 which is d to co-operate with one of a pair of beveled driving' pinions mounted on a transver ribbon driving or power shaft 74, saiil` shaiit beingsT horizontally disposed and zd in the lower part oi the main Associated with each driving` pinion a worin T6 comprised in the ribbon re L me 'hanisnr Said driving` pinions so disposed along; the shaft 74: that they adapted for alternative enga-gement with their associate beveled pinions 71 so that when one of said drivingv pinions is operativc the other pinion will be inoperative, as shown in Fig. 1. As appears therefrom, the turning;` movenient ot the driving` shaft 7a will be transmitted to the lett-hand ribbon spool, causing' the ribbon to wind thereon, corresponding amounts being drawn on or unwound trom the right-hand spool. ln order to rcv'erse the Vteedina` of the ribbon the shalt 74 is moved endwise toward the right to cause disconnection or the lett-hand drivin g pinion and a connection or operative engagei'nent ot the right-hand driving pinion with the associatie train of spool turning devices. The ribbon driving` shalt 74; is autoinaticall y turned to iced 'the ribbon by impulses communicated by the printinglrey levers through a train of connections including a shaft 61, arranged parallel with vand below the shatt Tal.. said shaft 81 being supported on stationary brackets 82 which receive bushings Sil in which the end portions ol" the shaft S1 bear. A collar or hub ST, pinned to the outwardly projecting richt-hand end portion of the shaft 81, has

'a forwardly projecting' cranlt'arm 88. Ar-

ranged on the shatt 61 near its ends are a pair ot parallel crank arms, the right-hand one ot said crank arms being shown in Fig'. land numbered S0, said crank arms being provided with hubs 90 that lit over the shaft rThe crank arms S9 are connected at their tree ends bya cross bar 92 which is adapted to be operated from he printingv key levers, said cross bar servinn' as a universal bar both -lier the ribbon teedingy mechanism and also tor the ribbon vil 'atingA mechanism. lt will be understood that when a lzev lever is depressed, the universal bar 92 will be swung rearward, communicating a limited extent ot rotary movement to the shalt 81 and swingingg'upward the rank arm El@ on said shaft. Said crank arm has pivoted to it a pawl arm 9B provided with a laterally extending tooth 93a that (io-operates with the teeth of a ratchet wheel 164 iised to the ribbon driving' shaft Til near its right-hand end, said ratchet A'200. The extension or wheel beingturned. to a limited extent by the action olf the pawl, this moven'ient being participated in by the ribbon driving shaft 7i and its driving pinions rlhe engaged one et the pinions. the lett-hand pinion in Fig. l. will Jrransmit such moven'ient to 'its associate beveled pinion .71 which in turn will effect a rotation of the upstanding feed shaft 6'?, causingthe pinions carried by said shaft at its upper end to turn the associate gear wheel 63 and the counter or spool shaft l2 together with the ribbon spool mounted thereon. Said spool as it turns winds on it a portion ot the ribbon and advances the unwound portion oit the ribbon le'ttwardly, altering to some extent the printing portion et the ribbon which is to receive the next type impression. lt will be understood that at each printingoperation an impulse will be communicated to the train of ribbon feedinn' mechanism in the manner described, the result beiner that the ribbon will be automatically ted or advanced longitudinally irom one ribbon spool to the other, and that this automatic feeding` or advance may be continued for the tull length et' the ribbon.

The automatic. reversing` mechanism is elfective to move the ribbon drivingl shaft Til longitudinally baclr and forth, the sha-itt being' held in predetermined longitudinal positions by a detent device comprising a collar 162 fixed to the shaft, said collar being provided with circumferential grooves 165 and 166. @lo-operative with said collar is a coiled spring or detent spring 16S housed in a two-

part box

169, 170. The automatic ribbon reversing` mechanism proper, wherein my present invention more particularly resides, ,is controlled by plies ot the ribbon, said mechanism comprising' a reversing device or member designated as a whole by the numeral 200. Said device is preferably formed of a single piece oit sheet metal and comprises an uprightvor ribbon engaging; portion Q01 having' parallel angulari;Y disposed sides 202 which extend downward below the bottom edge of the central part 201 and are perforated to receive the pivotal support of said member F200. One of the sides 202 is i'ormed with horizontally disposed inwai'd extension 20S which is curved or oils-set toward the rear as viewed in Fig. ll. thus bringing' the end portion oif the arm ror extension 205 in a plane about central ot' the device Q00. Sai-d device is received in an openingor cutout indicated at 20d in the plate the sides ot said opening' 20d; beings` provided with downward extensions or ears 205 which receive a pivot pin 206. said pivot pin passing through the perforated lower ends oi the sides 202 and providing` a pivotal suppiiirt tor the member arm Q03 ot said member projects inward past the axis ot the spool shaft 1-2 through a slot or cutout indicated at 207 formed in the hub 62 of the gear wheel 63. The cutout 207 extends downward into the top of the gear wheel 63 and connectsl with the lower end of the slotway 55 in the ribbon spool shaft, thus providing a continuous opening, affording freedom of motion for the arm 203 about the pivotal center 206; As clearly appears from Figs. 2 and 3 the tongue 59LL extends between the side walls 202 of the member 200 and the tip 59b underlies the bottom edge of the body or central portion 201 of said member. Owing to the inherent tendency of the

spring device

59, 60 to rise, the tip 59b will press upward against the bottom edge of the portion 201 when the ribbon spool is removed and will maintain the device 200 in the position illustrated in Fig. 2. Urdinarily, however, the

spring device

59, 60 is held out of commission by the bottom flange of the ribbon spool, and theV

upright portion

201, 202 of .the device 200 is maintained upright by the inner ply or plies of the ribbon 30 as illustrated at the left-hand side in Fig. 1. In this position the upright ribbon engaging portion 201 of the device 200 is maintained within the core 29 of the ribbon spool, said core being provided with a slot indicated at 29nfto afford play or swing of said portion 201 in and out about its pivotal axis 206. When there are one or more plies of the ribbon wound on the spool core 29 the inner ply bridging the slot 29L will co-operate with the upright portion or arm 201 of the device or lever 200 and hold it within the slot, thereby maintaining the extension or arm 203 in the position illustrated at the left-hand side of Fig. 1, and also in Fig. 2. Said arm 203 co-operates`with` the head 208 of a slide pin 209 which is received in' a bore or perforation formed axially in the lower portion 42a of the shaft 42. The head 208 of the slide pin underlies the arm 203 and has a limited play in the lower portion of the slot 55, while the pin proper 209 has a limited sliding movement in the bore of the ribbon spool shaft. The lower end of said pin projects below the lower end p0rtion of the shaft 42a and is rounded at its tip, the rounded tip being adapted to cooperate with a reversing device or gravity operated lever member designated as a whole by the numeral 210. Said lever member 210 is preferably formed of a .single piece of sheet metal and comprises a cent-ral or pivotal portion 211 extended at 212 to provide a contact arm, the sides of the pivetal portion being bent at right angles to provide parallel bearing ears 213, one of said ears being extended and spread in a general triangular or plate-like shape to form the gravity arm 214 of the lever member 210.

Said gravity arm is off-set or bent so that itsfree portion lies substantially in the central plane of the member 210. The ears 213 loosely embrace a lug 47;L formed on and extending from the lower side of the projection 47, said ears being perforated to receive a pivot pin 215 which bears in an opening in the lug 47 a, saidpivot pin being headed at its ends to prevent accident-al displacement. lWhen thus pivota-lly supported the arm 212 of the member 210 underlies and (3o-operates with the pointed tip of the pin 209. The gravity arm 214 is perforated near its outer end to receive the upper offset or hook portion 216 of a reversing pin 217, said pin being thus pivotally supported on the gravity arm and dependent therefrom, the lower end portionof said pin being guided in a hole formed in the projection 48 of the bracket 43. The lower end or ti of the pin 217 is beveled or pointed as indicated at 218 and is adapted to co-operate with the associate worm 76, the pointed end V218 being normally suspended, however, above the Vposition at which it mayvengage with said worm. It will b e understood that there are two trains of vreversing devices, each comprising a pivoted device 200 which in effectoperates as a bell crank lever, a headed

slide pin

208, 209, a gravity operated lever 210 and a reversing pin 217. The

lco-operating worms 76 are so disposed along theY ribbon driving shaft 74 that only one of them at a time is positioned for engagement with its-associate reversingpin 217 as will be understood from Fig. 1. Normally, the

pivoted reversing device or bell crank 200 is maintained by the ribbon plies in the position illustrated at the left-hand side of Fig. 1, in constant opposition to the force of gravity exerted chiefly through the lever 210. In said position the arm 203 of said device or member 200 acting against the head 208 of the slide pin will maintain said head in its lowermost position in contact with the top of the gear wheel 63. When the slide pin is thus held its rounded tip will h old down the arm 212 of the member 210 with the result that the gravity arm 214 is maintained in its uppermost position, holding the suspended pin 217 up above the operated field of the associated worm 76. It will be understood that owing tothe weight of the lever arm 214 the tendency of the arm 212 is constantly to rise and lift the pin 209, the head of said pin pressing upward against the arm 203 and tending to maintain the lupright port-ion 201 pressed outward against the ribbon ply bridging theslot 29% When the ribbon has been wholly unwound from the ribbon spool uncovering the slot 29a, the upright `portion 201 of the bell crank will swingoutward through the slot 29a, the arm 203 will swing upward, and the pin 209 will'rise, thus freeing the lever 210,

rall under the impulse of the force of gravity, acting chiefly through the lever memfree to swing downward permitting the reverse-pin 2i? to slide down into working position. The position then occupied by the train reversing devices that illustrated at the right-hand side of Fig. 1. After the lowering of the pinV 217 and its engagement with the associate worm T6 further rotary movement communicated to the driving shaft /lthrough actuations of the printing keys will cause said shaft as it isrotated to be wormed along or moved longitudinally to effect the `disconnection of one ribbon spool from the driving shaft andl the operative engagement or connection of the Aother spool therewith so that subsequent impulses from the printing keys will be, transmitted to the newly connected spool, causingfitto turn to wind the ribbon thereon, corresponding amounts being drawn from the looseor disconnected spool. 'lWhen the latter spool has thus been emptied of ribbon the reversing mechanism again will become autoniatically effective in the mannerdescribed. 'lt will be understood that the spring detent mechanism comprising. the collar 16,2l and the detent 168 is effective not only to main-v tain the driving shaft in predetermined longitudinal positions but will alsobassist by reason of the cam action of the sides of the grooves in the collar 162 to complete the reversing movement of the driving shaft.

From what has been said it will be plain that the

spring

59, 60 has a double function, viz., not only does it lift the ribbon spool when the spool latch 5e is operated but ythe tongue 59a, 591, co-operating with the member 200, ill hold it against swinging outward and in substantially the position in which it is normally maintained by the yribbon plies. The bottom edge of the portion 201 serves as a stop to -limit the upward movement of the lifting spring away from the plate 58. The body or

upright portion

201, 202 is shaped so that the corners are smooth and rounded and its top or ,tip curved inward as illustrated, all to facilitate and promote cci-operation with the ribbon. From Figs. l and 2 it will be apparentthat the inwardly curved tip of the upright portion of the member 200 is well within the core of the spool when the member 20() is normally maintained so that when a ribbon spool is replaced there is sufficient margin of safety to insure vthat said tip shall pass easily inside the inner ribbon plies, permitting the unobstructed restoration or replacing of said ribbon spool. i

It will be observed that by my present invention the ribbon reversing mechanism has been greatly simplified, a large number of parts employed in the prior construction having been rendered unnecessary and eliminated. My improved ribbon reversing mechanism is readily assembled and has been found highly efficient in the practical operation of the machine, respondin l promptly as soon as the parts arerelease by the ribbon pliesk and acting without subjecting the ribbon itself to any undue strain or ull.l

i arious changes may be made without departing from my invention.

lhat I claim as new and desire to secure by Letters Patent, is,

1. In ribbon reversing mechanism for typewriting machines, the lcombination of a ribbon spool, `a reversing device controlled by thev ribbon on said spool, a gravity operated lever, la slide pin connecting said lever with said device, a 'reversing pin suspended from said lever, a ribbon driving shaft, and a worm connected thereto, said reversing pin (3o-operating with said worm.

2. In4 ribbon reversing mechanism for typewriting machines', the combination of a'ribbon spool, a reversing device controlled by the ribbon on said spool, a gravity operated lever, a slide pin connecting the light arm of said lever with said'device, a reversing pin pivotally suspended fromA the heavier arm of saidy lever, aco-operating worm, and a ribbon driving shaft with which said worm is connected.

3. In ribbon reversing mechanism for typewriting machines, the combination of a ribbon spool, 'a pair of gravity operated levers, one controlled by the ribbon on said spool, connections between said levers, reversing pin supported by one of said levers, a ribbon driving shaft, and a device on said shaft lco-operative with said reversing pin. i

Il. In ribbon reversing mechanism for typewriting machines, the combination a ribbon spool, a pair of gravity operated levers, one controlled by the ribbon on said spool, a slide pin connecting said levers, a reversing pin supported by one of said levers, a ribbon driving shaft. and a device on said shaft `(Jo-operative with said reversing pin. l

5. In a reversing mechanism for the ribbon spools of typewriting4 machines, the combination of a ribbon spool shaft, a slide pin, said shaft providing a bearing for said pin, a pair Vof gravity operated levers c onnected by said pin, one of said levers being controlled the ribbon on said spool. a reversing pin supported by oney of said levers, a ribbon driving shaft. and a device on said shaft o o-operative with said reversing pin.

6. In reversing mechanism for the ribbon spools of typewriting machines, the combination of a ribbon spool shaft, a slide pin, said shaft providing a bearing for said pin, a pair of gravity operated levers connected by said pin, one of said levers being controlled by the ribbon on said spool, and havino` an arm extending through a slot in the b n spool shaft transversely across the axis iis ` thereof, said arm contacting with said slide pin, the other of said levers having a platelike arm; a reversing pin pivoted to said plate-like arm; and an element on which said ypin acts. i

7. In ribbon reversing mechanism for typewriting machines, the combination of a ribbon spool; a pivoted reversing device controlled by the ribbon wound on said spool; and vofravity operated devices constantly opposing the controlv of said pivoted device by said ribbon, said gravity operated devices comprising a lever, aslide pin between said lever and said pivoted device, and a reversing pin supported by said lever.

8. In ribbon reversing` mechanism for typewriting machines, the combination of a pair of ribbon spools, pivoted reversing devices associated with said spools and' controlled by the ribbon wound thereon, and trains of devices constantly opposing the control of said pivoted devices by said ribbon, said trains of devices each comprising a gravity operated lever connected with its associate pivoted device. e

9.v In a typewriting machine, the combination of a ribbon driving shaft; worms thereon; a pair of ribbon spoolsg'pivoted reversing devices associated with said spools and controlled by the ribbon wound thereon; and trains of gravity operated devices constantly opposing the control of said pivoted devices by said ribbon, said trains of devices eachl comprising a lever, a slide pin between said lever and said pivoted device` and a reversing pin pivotally suspended from said lever in position to co-operate with one ofv said worms.

- l0. In a typewriting machine,the combination of a. ribbon driving shaft; worms thereon;A a pair of ribbon spools; pivoted reversing devices associated with said spools and controlled by the ribbon wound thereon; trains of gavity operated devices constantly opposing the control of said pivoted devices lby said ribbon, said trains of devices each comprising a lever, a slide pin between said lever and said pivoted device and a reversing pin pivotally suspended from said lever in position to cooperate with one of said worms; and separate trains of ribbon feeding devices for connecting` said spools with said drivingshaft.

11. In a typewritinginachine, the'combination of a ribbon spool shaft, ribbon spools thereon, latching devices for said spools,

reversing devices associated with said spools,

and Vspring means for controlling said reversing devices when saidspools are detached and also for assistingsuch detachment, said spring means comprising for each spool a spring arm-provided with an annulus loosely embracing the associate sociate shaft and co-operating with the ribbon spool in a direction axially of the shaft, said annulus having a radially projecting tongue contactive with the associate reversing device.

13. In ribbon mechanism for typewriting machines, the combination of a pair of unitary vstructurescomprising two brackets detachably secured to the frame of the machine, one at its left-hand side and one at its right-hand side, and ribbon feeding and reversing devices including a spool or carrier mounted on each bracket, said brackets being interchangeable` so that they may be removed from andsecured at either side of the frame without interfering with the proper operation ofthe ribbon feeding andv reversing devices or disturbing the spools. 14. In ribbonmechanism for typewriting machines, the combination of a pair of unitary structures comprising two brackets,

and ribbon feeding and lreversing devices mounted on each bracket, and e securing screws for each bracket, said securing screws being threaded into the bracket symmetrically to its aXis and detachably securing the bracket tothe frame of the machine at one side thereof, said brackets being interchangeable so that each may be screwed to eitherside of the machine frame.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York, vthis 8th day of April, A. I). 1921..

, JOSEPH PHELPS. Witnesses:

CHARLES E. SMiTH, E. M. WELLS.