US1950725A - Ribbon feed and reverse mechanism - Google Patents

Description

LEEWEE Mwah H3, R934. M. GARBELL.

EiEEoN FEED AND REVERSE MECHANISE Filed Jan. 1o, i928 5 sheets-sheet l uw. um

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@mh is, 1934. M. GRBELL' 1,95032'5 RIBBON FEED AND REVERSE MECHANISM 5 sheets-shem-I 2 Filed Jan. 10, 1928 March 13, 1934. M. GARBELL.

RIBBON FEED AND REVERSE MECHANISM Filed Jan. 10, 1928 5 Sheets-Sheet 5 witness:

www5 March 13,1934; M. GARBELL RIBBON FEED AN Filed Jan. 10, 1928 D REVERSE MECHANISM 5 Sheets-Sheet 4 llarch 13, 1934. M. GARBELL RIBBON FEED AND REVERSE MECHANISM Filed. Jan. 10, 1928 5 Sheets-Sheet 5 Patented Mar. 13, 1934 RIBBON FEED 'AND REVERSE MECHANISM Max Garbell, Chicago,v Ill., assigner to \Vctor Adding Machine Company, Chicago, Ill., ay corporation of Illinois ApplicationJanuary 10, 1928, Serial No. 245,790

21 Claims.

My invention relates to typewriting machines and it has particular relation tothe ribbon feeding and reversing mechanism in such machines.

More particularly my invention has for its 5 object the provision of an automatic feed and reversing mechanism so associated With other novel assemblies and elements in my machine that a smoothly working and accurately timed mechanism is produced. Moreover, I provide my mechanism with means whereby it may be hand reversed, if the same is desired.

My invention with its advantageous objects will be better understood by reference to the accompanying drawings, in which:

Figure 1 is a plan View of so much of a typewriting machine embodying my invention as is necessary to disclose a complete operative embodiment or reduction to practice thereof;

Fig. 2 is a fragmentary elevational view disy closing themeans of operating the universal bar and its'associated ribbon feed; Fig. 3 is an elevational view partially in section of one of the feeding elements ofJny mechanism;

Fig. 4 is a plan view, taken approximately on une 4 4 of Figa;

Fig. 5 is a somewhat condensed plan viewfof the ribbon `spools and their immediately associated elements, in a machine embodying my in- Vention Fig. 6 is an elevational view utilized in my invention;

of one of th units Fig. 'l is a perspective view of said unit stripped of certain parts to better disclose the construction thereof;

Fig. 8 is an elevational View of another portion of the mechanism;

withthe elements thereof in the position which` they assume when the ribbon on the spool associated with the aforesaid unit is substantially exhausted and just after said mechanism has been thrown into operation to wind the ribbo of the spool associated therewith;

Fig. l() is a view similar to Fig. 9 but with the parts in the position they assume when the ribbon spool has been lled and when said ribbon is being withdrawn from said spool by' positive pull exerted thereon from the other ribbon spool; Fig. l1 is an elevational perspectivev view of the elements of my ribbon feeding and reversing mechanism when it is desired to Lassociate a hand reversing mechanism with described;

the device heretofore Fig. 12 is an elevational view of the same elements shown in Fig. 11;

Fig. 13 isa plan view partially in section of the same elements;

Fig. 14 is a fragmentary elevational View showing thewmounting of one of the members of my invention; and,

Fig. 15 is an elevational view partially -in section showing another important element of my combination.

Referring now more particularly to the drawings, and alluding first to the operating mechanism for actuating the feeding of theribbon from the spool at one side of the machine past the printing point Ato the spool at the other` side thereof, attention is directed to Figs. 1 and 2 wherein an intermediate lever 20 is disclosed, which lever is pivoted, along'with the other intermediate levers of the machine, on a pivot Wire 21. It is understood, of course, that said levers comprised in the action of the machine are depressible through the action of key levers (not shown). This action, however, is more fully described in my copending applications Serial No. 720,255, 'led June 16, 1924, and No. 237,392, led December 3, 1927 and it will therefore suffice to point out that a member on the key lever engages in a slot 22 of the intermediate lever and depresses the same so that a foot portion 23 contacts with universal bars 24 and 25. The bar 24 may be designated the escapement bar since the depression thereof by the feet 23 of the intermediate levers, actuates the escap'ement mechanism, as described in the aforementioned applications, Whereas, bar 25 may be designated the ribbon universal bar since depression of said latter bar serves to operateboth the ribbon vibrat- .ing' mechanism, more fully described in my copending applcations SerialNo. 37,085, filed June 15, 1925, and No.,245,791, led January 10, 1928, and the ribbon feeding mechanism.

Hereafter therefore, in referring to the actuation of the universal bar, it will be understood that for the purposes of this application I am referring 'to the ribbon universal bar, or bar 25. Incidentally, it may also be mentioned that typebars are connected to teeth 26 on the .intermediate lever so that, throughsaid geared connections, the typebars are thrown to the printing point at about the same time as the universal bars are depressed to operate the associated mechanism.

A ribbon feed` pawl supporting-bracket 27 is swung between arms 28 and'29 extending rearwardly from the bar 25. The aforesaid arms are lpivotally"mounted at 28a and 29a respectively,

and extend further rearwardly and terminate in ends`28b and 29h respectively, whereby the movement of the bar 25 in a vertical direction is limited by stop portions 28o and 29e respectively. These stop portions are adjustable to predetermine the oscillation distance of the bar 25, all as more fully described and claimed in my copending application Serial No. 229,439, filed October 28, 1927. The aforesaid bracket 27 has mounted 'thereupon spring biased pawls 27a and 27h.

A shaft 30 is supported in the frame of the typewriter in a swivel joint 31, which latter is fixed at approximately the center of the transverse distance betweenutherribbon spools ofthe machine. Said shaft 30 is provided with a spherical enlarged portion 32 which works in the spherical bearing 31 to permit oscillation of the shaft 30 about its midpoint, as indicated by the dotted lines in Fig. 4.

A gear or ratchet wheel 33 is rigidly secured to the part 32 of the shaft so that 'rotation of said wheel 33, by the depression of the keys, rotates the shaft 30. Referring to Fig. 3, it will be seen that when the bar 25 is depressed the pawls 27a and 27h Will engage the teeth of ratchet wheel 33 and thereby rotate shaft 30. When said universal bar 25 rises, the pawls 27a and 27h will, through the action of springs 27e and 27d associated therewith, return to a position to engage the next succeeding tooth on the gear 33 upon the next depression of the universal bar 25.

Referring now to the ribbon supporting and feeding mechanism proper, attention is first directed to side walls 34 and 35 comprising portions of my machine frame, these said portions rising from a bottom member 36 of said frame. The frame per se and its associated parts are more fully described and claimed in my copending application Serial No. 239,335, filed December 12, 1927, and reference should, therefore, be had to the said application for a more detailed description of these elements. y

At this point I wish tojemphasize one particular feature of my linvention which is of marked advantage so far as it relates to the benefits dev,Iived from the combination herein described. That is, I initially mount a large portion of my supporting and feeding mechanism in a unitary 'assembly which .is secured 'on what may be aptly termed a, unitary ribbon mechanism bracket. This bracket, with its associated mechanism, is then 'secured to the side frame of the machine and by `reason of the unitary feature thereof, a marked advantage is obtained in the assembly of the machine in the course of manufacture. Not only, however, is such an advantage obtained in the actual manufacture of the'machine, but the repair thereof is greatly facilitated by the aforesaid unitary treatment of each ribbon spool -bracket and I Wish it to be understood that this feature of my invention and the manner of its association in the machine is hereinafter claimed `as novel and I believe contributes markedly to the advantages of the device hereinafter claimed.`

The form of the aforesaid bracket may be best seen by referring to Figs. 6, 7, 9 and 10. In these figures I have in each instance illustrated the particular bracket, and its mechanism, which is positioned at the left side of the machine `(assuming that the front `of the machine in Fig. 1 is at the bottom of the figure) but it is to be understood, of course, that the mechanism at the other side of the machine comprises the same assembly as that which I shall-herea`fter describe in connection with the left side of the machine, but with the elements thereof necessarily reversed.

"As above intimated, the mechanism is in large part initially mounted on brackets which are secured to the sidewalls 34 and 35. The form of these brackets, which may be' stamped to facilitate low cost and ease of production, is observable in the figures hereinbefore indicated. The brackets comprise a securing portion 37 which yis spot welded, or otherwise secured to the side wall 34, as seen in dotted lines in Fig. 7. The brackets also comprise a top plate 38 and a face portion 39,

which latter is appropriately contoured and promember 42 is provided at the upper end of said 4 shaft 40, which member is secured to the shaft and is positioned in a depressed portion 38a of the top plate of the bracket. A reduced part 40a at the upper end of the shaft 40 is adapted to receive an ordinary ribbon spool 43 and by reason of the tight t rotates said spool when the shaft 40 is rotated.

Ribbon spool cups 44, with their accompanying lids 45, are secured to the plate portion 38 to function in the usual manner. 'Ihe cups in my machine are provided with cut-out portions 46 positioned opposite each other and at the upper edge of the cups to permit easy removal of the spool from the shaft. This is a simple feature but has contributed markedly to the commercial. acceptance of my machine.

A ribbon 43a is reeled on the spool-43 and passes out through an aperture 44h in the side of the cup 44. Said cup 44 is also provided with a slot 44c through which slot an arm 47 extends intocontactive. relation with the reeled ribbon 43a. Said arm 47 is rigidly secured at 48 to the upper end of an oscillatory shaft 49, the latter being journaled at 50 in the plate 38 at its upper end and in a lug 51 at its lower end, a collar 52 holding the shaft 49 in position. In this connection, it should be observed that the lug 51 is a part of the unitary bracket and is bent out from a stamping, as shown.

Mounted rigidly on the bottom of the shaft 49 is an arm 53 which is provided at its outer end with a hook 54, the purpose of which latter will be later explained. The said arm 53 is one lof the vital elements of the ribbon reversing mechanism and is constantly biased in such direction that the ribbon-engaging arm 47 is kept constantly in contact with the periphery of the ribbon and follows said ribbon as the radius of the reeled ribbon decreases. A spring 55 provides said bias by being connected between .the arm 53 and a. right-angled lug 56 having an elongated slot 57 therein. Here again, it will be observed that the lug 56 is bent from. a stamping. l

A shaft 30 is provided with an eccentric cam. 58 which is rigidly-mounted upon said shaft through -the medium of a collar 59 so that when the shaft 30 turns the aforesaid cam 58 turns with it. A gear supporting bracket 60 has two arms 61 and 62 which are apertured to permit the passage therethrough of the extreme end portion of the shaft 30. A collar 63 is positioned between the arms 61 and 62 and serves to properly hold a gear wheel 64, .the latter being secured to the shaft 30. Said gear wheel 64 is beveled and meshes with a companion gear 65 mounted on a shaft 66 disposed vertically and journaled in the upper part of the bracket 60. Another spur gear 67 is secured to the upper end of the shaft 65.

As best seen in- Figs. 9 and l0, an oscillation in a horizontal plane of the shaft causes the bracket to carry the gear 67 into mesh with a larger gear 68 secured to the shaft 40, which shaft, as hereinbefore described, carries the ribbon spool on its upper end. In order to insure rectilinear movement of the bracket 60, as well as to prevent any tendency of the said bracket t0 turn as the shaft 30 turns, an extension 69 projects from the bracket and through a slot 70 into the lower portion of the f rame of the bracket 39. Moreover, as hereinbefore indicated, the shaft 30 passesthrough the elongated slot 57 so that it.

may be properly and accurately shifted in a horizontal direction when occasion requires.

In order to insure the accurate meshing of gears 67 and 68, an `extreme outer end 71 of the shaft 30 is adapted to be engaged by cooperating por-I ltions 72 and 73 (Figs. 6 and 7) on a pivotally mounted bracket 74. The said bracket is mounted on a spindle-75, which latter is pivoted at 76 on a lug 77 turned out from the'unitary stamping of bracket 38. A stop member 78 is likewise turned out from the aforesaid bracket and obstructs the movement of member 79 attached to said bracket 74 so that when said bracket is urged in a counterclockwise direction by springf80 its limit of movement will be defined. Said spring 80 is connected to a lug 8l formed integral with the member 74, as best seen in Figs. 1 and 6, the aforesaid biased bracket 74 operates through the medium of the rounded lug 73 to insure the'correct positioning of the driving gears in either operating or non-operative position; the end 71 of the shaft 30 being beveled as shown, wherefrom it is constrained to move its full distance on each oscillation of the same to cause reversal of the ribbon feed. l

Referring nowparticularly to Figs. 1, 9 and 10, it will be assumed that the ribbon spool mounted on shaft 40 at the right of the machine has been reduced to itsminimurn, or inl other words, nearly all the ribbon has been fed off therefrom and it is desired to cause said spool at the right to reverse its direction of movement and positively pull the ribbon from the left-hand spool. As the arm 53, because of the gradual ekhaustion'of the ribbon on the spool associated with said arm, is swung inwardly by the action of spring 55, the hook 54 gradually comes closer and closer to engaging the cam 58. Just as the ribbon is substantially exhausted, the hook 54 comes into the path of the cam 58 and, as shown in Fig. 9, the aforesaid cam will then engage said hook when the long side of the cam comes toward the back of the machine. Inasmuch as the arm 53'is xed, the engagement of the cam 58 and the hook 54 will result in moving the shaft 30 about its center point, whereupon the'gear 67 will be moved into engagement with the Vgear 68 attached tothe shaft 40 carrying the ribbon spool, the ribbon on which is exhausted.

The engagement of the gears then causes such a rotation cf the shaft 40 that the ribbon is positively rewound onto the exhausted spool. understood, of course, that when the gears are thrown into mesh at one end of the shaft they are thrown out of mesh at the other en d thereof `so that the ribbon is being positively pulled off a full spool and reeled onto an empty spool. The arm 47 is gradually pushed outwardly from the center of thespool upon which the ribbon is being wound so that the arm 54 leaves the path of the cam,58, and finally the same operation is repeated at the other end wherefrom a desirable reversal for the ribbon feed is automatically effected.

I have already described in connection with Figs. 3 and 4, the manner in which the feed shaft 30 is gradually rotated by the depression of the key levers and it is this motion that is transmitted through the associated gears 67 and 68 to feed the ribbon first in one direction and then in the rimer.

The elements here described are very simple in character and nearly all of them may be manufactured by stamping or punching operations. The bracket which I have heretofore described and referred to as my A,unitary ribbon bracket is produced by stamping and all the lugs and slotted portions thereon are formed by bending properly contoured parts from said stamping so that a minimum of labor is required to produce this very important unit of my ribbon feed mechanism. The advantages of having a shaft ocillatable about its mid-point are very marked since a positive feed may be imparted thereto'by the feeding pawls irrespective of which end ofthe shaft is in operative engagement with a ribbon spool.

In Figs. 11 to 15 inclusive, I have illustrated the manner in which my improved -oscillatory shaft ribbon feed and reversing mechanism may be adapted for hand reversal. The bracket used is much the same as that heretofore described with. the exception that a resiliently mounted stop bracket 80 is pivotally secured to a lug81 which, in turn, is secured to the lower portion of the frame 39. The shaft 30 extends through the side plate 34 of the machine and is provided with a knurled graspable portion 82. Said shaft is maintained in either operating or non-operating position by a. beveled lug 83 on the resiliently mounted bracket 80. 4Stop portions 84 and 85 are also formed on the member 80 to hold the shaft 30 in either its operating or non-operating position, as the cas'e may be. A portion 85 is likewise provided on the bracket 80 and serves to limit the movement of said bracket 80 under the infiuence of 'a spring 86 which' is attached to a lug 87 on the bracket 80 and a companion lug 88 on the unitary bracket 39. When, therefore, the knurled portion 82 is pushed horizontally in the slot 82a, the shaft 30 rides up on one side of the bevel 83v and pushes said bracket 80 downwardly, which results in the shaft 30 snapping over into non-operative position as shown in the dotted lines in Fig. 15.

I find thehand operation Iof my device very advantageous and satisfactory, and the same advantages as to economy of manufacture and accuracy of operation will be realized in connection with the hand reverse as with the` automatic reverse.

In the foregoing description I have discussedv my invention as embodied in amore or less specific form of mechanism. Itis to be understood,

of course, that such specificv embodiment is for illustrative purposes only and is in no sense in-y carried into'andfout of operative relation with the art of the most feasible manner of utilizing my invention, I have described in some detail the mechanisms associated with my invention and have, for illustrative purposes, discussed certain particular forms of such mechanisms. Here again I do not intend to be restrictive in any sense, since I wish it understood that the cams and the hooks associable therewith to effect a ribbon reverse are, from one point of view, an important part of my invention and may be associated with any other mechanism which would perform equivalent functions with those heretotofore described.

Briefly, therefore, I wish to emphasize that while my invention has, of necessity, been described in connection with a particular embodiment of the said contribution to the art, it is not to be confined to the hereinbefore description, and while I have described but two embodiments 'of said invention, it is obvious that those vskilled in the art may practice the same with other elements without departing from the spirit of the present invention, and therefore, I desirel that my invention be limited only by the scope of the appended claims or by the showing of the prior art.

I claim: y

1. In a typewriter, ribbon feed mechanism comprising two ribbon spools receiving a ribbon adapted to be unreeled from one spool and reeled upon the other spool, a rotatable and rockable shaft extending across the machine and carrying at its opposite ends means for driving the respective spools, an arm continuously pressed against the outermost turn of ribbon wound upon each spool, and means comprising alternately engaging cams associated-with said shaft and hooks respectively connected to said arms and moved thereby in accordance with the amount of ribbon on the corresponding spools for effecting a rock of said shaft and a reversal of the ribbon feed under the influence of an actuating force supplied'directly by the rotation of said shaft.

.2. In a typewriter, ribbon feed mechanism comprising two,ribbon spools receiving a ribbon adapted to be unreeled from one spool and reeledV upon the otherv spool, a rotatable and rockable shaft extending across the machine and carrying at its opposite ends means for driving the respecj tive spools, an arm continuously pressed against -the outermost turn of ribbon wound upon each spool, and-means comprising alternatelyV engaging cams associated with said shaft and hooks for effecting a rock of said shaft and a reversal 'of the ribbon feed under the influence of an actuating force supplied directly by the rotation of said shaft, said hooks being respectively con- `nected to said arms and thereby controlled as to position by'the ribbon as it is fed.

3. In a typewriter, a ribbon feed mechanism comprising a rotatable main driving shaft extending across the machine, two rotatable ribbon spool shafts, an arm continuously pressed against the outermost turn of ribbon wound upon each spool, and means comprising hooks controlled by the respective arms for engaging and alternately effecting tilting of the ends of said driving shaft and the spool shaftsrelatively to 4. In a, typewriter, a ribbon feed mechanism comprising a rotatable main driving shaft. extending across the machine and rockable about its center, two rotatable ribbon spool shafts, an arm continuously pressed against the oui :rmost turn of ribbon wound upon each spool, and means ble about its center and two ribbon spool shafts driven by the rotation of said driving shaft, and means comprising ribbon-controlled hooks and cammembers associated with and rotatable by .the rotation of said driving shaft and adapted for engagement by said hooks at predetermined points during the feed `of said ribbon, said hooks being associated with each of said ribbon spool shafts to cause said driving shaft ends and said ribbon spool shafts to tilt relatively toward each other to effect selective driving cooperation `therebetween.

6. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted to be alternately operatively associated with said shaft, means for oscillating said shaft about its center` to provide said alternate association, an arm, the position of which is controlled by the ribbon, and a cam on said shaft engageable thereby at a predetermined time during said ribbon feed.

7. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted to be alternately operatively associated with said shaft, means for oscillating said shaft aboutits centerto provide said alternate association, an arm, the position of which is controlled by the ribbon, and a cam on said shaftengageable thereby at a predetermined time during .said ribbon feed, said cambeing continuously rotatable and said arm being gradually swung into engagement' therewith as the ribbon is exhausted;

8. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted to be alternately ,operatively associated withl said shaft, means for oscillating said shaftabout its center to provide said alternate association comprising a gear at each end of said rotatable shaft, ribbon spool rotating gears associated with each ribbon spool and adapted to beaIternately brought into operative engagement with said gears at the ends of said shaft by the oscillation of the latter, and means including a ribbon-operated arm and a cam engageable therewith at each end of said shaft for oscillating said shaft.

9. In a typewriter, a ribbon feed mechanismv comprising a rotatable shaft, ribbon driving means adapted to be alternately operatively associated with Asaid shaft, means for oscillating said shaft about its center to provide said alternate association comprisinga gear 'at each end of said rotatable shaft, ribbon spool rotating gears associated with each ribbon spool and adapted to be alternately brought-into operative engagement with said gears at the ends of said shaft by the oscillation of the latter, and means including a ribbon-operated 4arm and a cam engageable therewith at each endof sai'd shaft for oscillating said shaft, the engagement of said arm and said cam occurring when said ribbon is substantially exhausted from the spool associated with the arm and said cam compelling said shaft gear to move horizontally into mesh with said ribbon spool gear.

10. In a typewriter, aribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted to be alternatelycperatively associated with said shaft', means for oscillating said shaft about its center to provide said alternate association comprising a gear at each end of said rotatable shaft, ribbon spool rotating gears associated with each ribbon spool and adapted to be alternately brought into operative engagewith said gears at the ends of said shaft by the oscillation of. the latter, and means including a ribbon-operated .arm vand a cam engageable therewith at each end of said shaft for oscillating said shaft, thev engagement of said arm and said cam occurring when said ribbon is substantially exhausted from the spool associated with the arm, and said cam compelling said shaft gear to move horizontally into mesh with said ribbon spool gear, said gear and cam being on said shaft, and all of the remaining ribbon mechanism for each spool being mounted on a unitary assembly bracket.

11. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted -to be alternately operatively associated with said shaft, means for oscillating said shaft about its center to provide said alternatel association comprising a gear at each end of Vsaid rotatable shaft, ribbon spool `rotating gears associated with each ribbon spool and adapted to be alternately brought into operative engagement with said gears at the ends of said shaft by the oscillation of the latter, and means including a ribbon-operated arm and a cam engageable therewith at each end of said shaft for oscillating said shaft, the engagement of said arm and said cam occurring when said ribbon is substantially exhausted from the spool associated with the arm, and said cam compelling said shaft gear to move horizontally into mesh with said ribbon spool gear, said bracket being formable by stamping so that all the supportingparts there-- of may be bent therefrom.

12. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted to be alternately operatively associated with said shaft, means for oscillating said shaft about its center to provide said alternate association, said means comprising an arm adapted to follow the ribbon as the same is excomprising a rotatable shaft, ribbon driving,

means adapted to be alternately operatively associated with said shaft, means for oscillating said shaft about its center to provide said alternate association, said means comprisingan arm adapted` to follow the ribbon as the same is exhaustedfrom, or fed onto, a spool, a hook con trolled by said arm, an eccentric cam on said shaft, a ribbon spool driving gear, a gear operated by said shaft, said hook being positioned in the path of said cam' to pull said shaft gear into mesh with said spool driving gear at a predetermined time during the ribbon feed, aV bracket loosely associated with said shaft and carrying said shaft gear, and means insuring the horizontal movement of said bracket and gear when said shaft is pulled around its center by said cam and hook.

'14. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted to be alternately operatively associated with said shaft, means for oscillating said shaft about its center to provide said alternate association, said means comprising an arm adapted to follow the ribbon as the same is exhausted from, or fed onto, a spool, a hook controlled by said arm, an eccentric cam on said shaft, a ribbon spool driving gear, a gear operated by said shaft, said hook being positioned in the path of said cam to pull said shaft gear into mesh with said spool driving gear at a predetermined time during the ribbon feed, a bracket loosely associated with said shaft and carrying said shaft gear, means insuring the horizontal movement of said bracket and gear when said shaft is pulled around its center by said cam and hook, and

means insuring a snap movement of said shaft gear from operative to inoperative position.

15. In a typewriter, a ribbon feed mechanism nate association, said means comprising an armv adapted to follow the ribbon as the same is exhausted from, or fed onto, a spool, a hook contrlled by saidvarm, an eccentric cam on said shaft, a ribbon spool driving gear, a gear operated by said shaft, said hook being vpositioned in the path of said cam to pull said shaft gear into mesh with said spool driving gear at a predetermined time during the ribbon feed, a bracket loosely associated with said shaft and carrying said shaft gear, means insuring the horizontal movement of said bracket and gear when said shaft is pulled around its center by said cam and hook, and means insurin a snap movement of said shaft gear from operative to inoperative position comprising a biased beveled member engaging a. beveled end of said shaft.

16. In a typewriter, a ribbon feed mechanism llo comprising a rotatable shaft, ribbon driving i means adapted to be alternately operatively as-v sociated with said shaft, means for oscillating said shaft about its center to provide said alternate association, said means comprisingan arm adapted to follow the ribbon as the same is exhausted from, or fed onto, a spool, a hook controlled by said arm, an eccentric cam on said shaft, a ribbon spool driving gear, a gear operated by said shaft, said hook being positioned in the path of said cam to pull said shaft gear into mesh with said spool driving gear ata predeterminedtime during the ribbon feed, a bracket-loosely associated with said shaft and carrying said shaft gear, and means comprising an extension on said movement of said bracket and gear when said shaft is pulled around its center by said cam and hook.

' bracket Working in a slot insuring the horizontal 17. In a typewriter, a. ribbon feed comprising a rotatable shaft, means for mounting said shaft for oscillation about its center, cams carried by said shaft, and two individually mounted unitary assemblages of elements each including a ribbon spool, means for transmitting rotation thereto, an arm continuously Vpressed against thev outermost turn of ribbon Wound upon said spool, and means controlled by said arm and engageable with one of said cams for controlling the oscillation of said shaft whereby operative relation is alternately established between said shaft and the rotation-transmitting means of rst one and then the other of said unitary assemblages, said oscillatable shaft mounting being lindependent of said unitary assemblages.

18. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, means for mounting said shaft for oscillation about its center, cams carried by said shaft, and two individually mounted unitary assemblages of elements each including a ribbon spool, means for transmitting rotation thereto', an arm continuously pressed against the outermost turn of ribbon wound upon said spool, means controlled by said arm and engageable with one of said cams for controlling the oscillation of said shaft whereby operative relation is alternately established between said shaft and the rotation-transmitting means of first one and then the other of said unitary assemblages,

and a unit bracket for each of said assemblages permitting the initial mounting of all of said assemblages thereupon prior to incorporation into the main typewriter .,assembly, said oscillatable shaft mounting being independent of said unitary assemblages;

19. In a typewriter, a ribbon feed mechanism comprising" a rotatable shaft, ribbon driving of said assemblages permitting the initial mounting of all of said assemblages thereupon, prior to incorporation in said machine, said bracket having a top horizontal portion carrying a ribbon spool, a ribbon spool shaft-supporting portion, a governing arm support, and a part defining the said feed shaft movement, al1 of the same being bendable from a unitary stamping.

20. yIn a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving means adapted to be alternately operatively associated with'said shaft, and means for oscillating said shaft about its center to provide saidalternate association comprising a graspable portion at each end of said shaft and also comprising an arm continuously pressed against the outermost turn of ribbon wound upon each spool, cams carried by said shaft and cooperating hooks respectively connected to said arms and moved thereby in accordance with the,a1nount of rib- 95 bon on the corresponding spools for effecting automatic reverse of such feed independently of said graspable portions.-

21. In a typewriter, a ribbon feed mechanism comprising a rotatable shaft, ribbon driving'100 means adapted to be alternately operatively associated with said shaft, means for oscillating said shaft about its center to provide said alternate association comprising a graspable portion at each end of said shaft and also comprising an arm continuously pressed against the outermost turn of ribbon wound upon each spool, cams carried by said shaft and cooperating hooks respectively connected to said arms and moved thereby in accordance withlthe amount of ribbon on the corresponding spools for effecting automatic reverse of such feed independently pf said graspable portions, and gears onvsaid shaft adapted to be thrown into operative'ergagement 1 with the ribbon spools when said graspable portions or said ribbon-governed means are operated 'to oscillate said shaft about its center.

- MAX GARBELL.

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