US2278009A - Typewriting machine - Google Patents

Description

March 1942- c. F; HANDLEY 2,278,009

TYPEWRITING MACHINE- Filed Sept. 30, 1940 6 Sheets-Sheet 1 FHand/ey INVENTOR or BY ATTORNEYS QNY .NN u mN ww .wwwm

March 3.1, 1942.- s. F. HANDLEY TYPEWRITING MACHINE Filed Sept. 30, 1940 a Sheets-Shet 2 Qmw wa FHancZ/ey INVENTOR ATTORNEYS March 31, 1942. a F. HAND LEY IYPIEIWRITING MACHINE Filed Sept. 30, 1940,

6 Sheets-Sheet 3 gun w March 31, 1942. a. F. HANDLEY TYPEWRITING MACHINE Filed Sept. '30, 1940 6 Sheets-Sheet 4 leg W d mm R VE @m Patented Mar. 31, 1942 TYPEWRITING MACHINE George F. Handley, Glendale, N. Royal Typewriter Company, N. Y a corporation of New York Y., assignor to 1110., New York,

Application September 30,1940, Serial No. 359,119

35 Claims.

This invention relates to typewriting machines, and more particularly to typewriter ribbon itioning and feeding mechanism. Mechanism embodying the invention may be employed advantageously for positioning and feeding typewriter ribbons or strips of various kinds, but is especially'adapted for positioning and feeding narrow carbon paper or like copying strips or ribbons. The construction disclosed herein as an example of mechanism embodying the invention is shown as being used for the positioning and feeding of hektograph ribbon producing negative imprints on matrix sheets which subsequently are used for making positive copies.

Typewriters heretofore available commercially for performing such work customarily have been equipped to feed hektograph ribbon from a supply roll usually containing three hundred feet of ribbon. It has been possible to guide the ribbon along the printing line so that type impressions are made through a ribbon zone on one side only of the horizontal center line of the ribbon. After the entire length of the ribbon has been fed along the printing line, there has remained an unused second ribbon zone on the other side of the horizontal center line of the ribbon. By turning the ribbon upside down or shifting the ribbon guides vertically and running the ribbon past the printing point again, it has been possible to make use of the second ribbon zone, so that the total effective usable ribbon length has been six hundred feet. However, due to the difllculty or impossibility of maintaining the ribbon very accurately positioned at just the right level along the printing line, it heretofore has not been possible to segregate and use separately more than two zones of ribbon of ordinary commercial width.

An object of the present invention is to provide ribbon positioning and feeding mechanism which is capable of maintaining the ribbon very accurately positioned so as to confine typing impressions within a definite and sharply defined zone extending longitudinally throughout the ribbon. By so confining the typing impressions within an accurately and sharply defined zone, it is possible to bring the zones, or the lines of typing in adjacent zones, very close together without danger of overlapping of typing impressions. This makes it possible'successively to make the typing impressions through three separate zones of ribbon of a given width as compared to the two zones of ribbon of the same width available separately when used with equipment heretofore "available. Hence mechanism according to the present invention makes possible the eil'ective use of a total of nine hundred feet of ribbon zone in a ribbon of the same size as ribbons which heretofore could be used with an effective zone length of six hundred feet.

Another object is to provide ribbon feeding mechanism of the character referred to which effects an accurate positioning of the ribbon after the line-spacing operation, so that any displacement of the ribbon incident to line-spacing will be overcome or corrected before the typing of a new line starts.

Another object is to provide mechanism for applying tension to the ribbon after the typewriter carriage has been moved to line-typingstarting position.

Another object is to provide means for imparting a retractive stretching to the ribbon following the line-spacing operation.

Another object is to provide ribbon-positioning mechanism of the character referred to with control equipment for rendering the positioning mechanism incapable of applying tension to the ribbon during certain stages of machine operation, such as tabulating or other non-escapement-controlled carriage movement.

Another object is to provide improved means for feeding ribbon,

Other objects will become apparent from a reading of the following description, the appended claims, and the accompanying drawings, in which:

Figure 1 is a top plan view of a typewriter equipped with mechanism embodying the invention, some conventional. parts being omitted;

Figure 2 is afragmentary front elevation of equipment shown in Figure 1;

Figure 3 is a vertical section on the line 3-3 in Figure 1 and drawn on an enlarged scale, some parts being omitted and others being shown in end elevation;

Figure 4 is a fragmentary top plan view drawn on an enlarged scale as compared to Figure l, and

with some parts being omitted; A

Figure 5 is a vertical section on the line 5-5 of Figure 4; o V

Figure 6 is a detail horizontal section showing pawl and ratchet controlled ribbon rolls:

Figure 7 is a vertical section on the line 1-1 of Figure 4;

Figure 8 is a horizontal section on the line H of Figure 7;

Figure 9 is a fragmentary end elevation looking in the direction of the arrow 9 in Figure 1 and being drawn on an enlarged scale;

hon;

' shownin Figure 12, the ribbonpartly in section, taneously merits by means of a ball race Figure 10 is a distorted sectional view taken on the line "-40 of Figure 9, parts being shown in the positions occupied during feeding of rib- Figure 11 is a detail vertical sectional view showing the relative positions of a hektograph ribbon, regular fabric ribbon; matrix sheet, and conventional typewriter parts;

Figure 12 is a detail top plan view of ribbon positioning and tensioning equipment, drawn on an enlarged scale;

Figure 13 is a front elevation of the equipment being shown with character impressions in'its central zone;

Figure 14 is a detail view of a portion of a ribbon with character impressions in two ribbon zones;

' Figure showing additionally typing third ribbon zone;

Figure 16 is a fragmentary elevational view of a modified form of ribbon feed drive clutch;

Figure 1'7 is a fragmentary sectional elevation of tabulating mechanis showing parts in the positions occupied during tabulating operations;

Figure 18 is a view partly in side elevation and showing mechanism for simuldisabling ribbon tensioning equipment and carriage escapement mechanism;

Figure 19 is a fragmentary vertical section on the line l9-l9 of Figure larged scale and showing ribbon-tensioning parts after having been shifted totension and impressions in the stretch the ribbon;

Figure 20 is a vertical sectional view of a ribbon feed drive clutch, the parts being shown in the positions occupied when the clutch is disengaged;

Figure 21 is a horizontal section onthe line 21-2! of Figure 20; and

Figure 22 is a horizontal section on the line 22-42 of Figure 20.

the invention may be typewriters of various of illustration, 9. prel Mechanism embodying used in connection with kinds. For the purposes ferred embodiment plied to a Royal Standard typewriter including a main frame A and a carriage 13 mounted 'on the frame for letter-spacing and return movea carriage rail 2. A platen C is mounted on the carriage between end plates 3 and 3', and is adapted to be rotated for line-spacing by a combined line-spacing and carriage return lever 4. A spring-powered drum or the frame is connected to the carriage in a known manner by a draw band 6 for moving the carriage in the letter-spacing direction. Such carriage movement is controlled by escapement mechanism including an escapement wheel 'I mounted on an escapement frame 8 to rotate with a pinion 9 adapted to mesh withan escapement rack l carried by a bail including arms II and H pivoted as at l2--l 2' respectively on the carriage end plates. Suitable means for disabling the escapement mechanism to permit free movement of the carriage is provided, and in the form shown includes rack release levers l3 and I3 of a known kind pivoted respectively as at l4l4"on the end plates 3 and 3'. The rack release levers are formed with-guide slots l and I5 respectively adapted to receive pins l6 and i6, and the levers are formed respectively with offset lifting lugs l1 and I1 engageable under the bail arms H and H 4, drawn on an en-,

of the invention is shown apframe rail l and barrel 5 journaled on for lifting the rack '15 is a view similar to Figure 14 but upon depression of either of the levers l3- l3'. Adjustable eccentric rack are mounted on the carriage end plates 3 and 3', respectively, for limiting the downward movement of the rack l0 into engagement with the escapement pinion 9.

The typewriter mechanism such as to Myers 2,007,611, granted July 9, 1935. comprises a bracket l9 secured of the'main frame A, and,a center stop finger 2O pivotally mounted as at 2| on the bracket 13. A tabulating stop finger 22 pivotally mounted as at 23 on the bracket I9 is adapted to be rocked coniointly with the center stop lever by an adjustable link 24 pivotally connected to the center stop lever as at 25 and pivotally connected to the tabulating finger 22 as at 2B. A column stop frame generally designated 21 is supported between the carriage end plates 3 and 3' and serves to mount a plurality of column stops 23 only one of which is shown. Means for disabling the escapement mechanism and for rocking the center stop lever 20 and tabulating finger 22 for shown includes tabulating It to the rear wall performing tabulating operations includes a tabulating key lever 29 fulcrumed on the main frame as at 30 and having an arm 3i formed with a projection 32 extending behind a rock arm 33 also fulcrumed on the main frame as at 30. A link 34 is connected between the upper end of the rock arm 33 and the lower end of an ex-' tension 35 of the center stop lever 20, the arrangement being such that when the tabulating key lever 29 is depressed the center stop lever 20 will be rocked in a clockwise direction and the tabulating finger 22 will be rocked in a counter clockwise direction as viewed in Figures 3 and 1'1, so as to displace the upper end lever 20 from the path of the usual margin stop (not shown) and move the tabulating finger 22 into the path of one of the column stops 2! previously set in column-determining position.

. a rack-lifting lever 35 pivoted Simultaneously with such movement of the, center stop lever, the lower end thereof will engage as at 31 on the escapement frame 8 and rock it so as to bring an arm 33 of the lever 35 into engagement with the bar 33 of the rack'bail for lifting the rack above and clear of the escapement pinion 9.

As shownin Figure 11, the platen C, mounted on a shaft 40, is arranged in the usual manner with respect to bottom pressure rolls 4|-4I, a paper bail 42, and a paper pan 43. One type bar 44 is shown in printing position.

The line-spacing lever combined functions of transmitting line-spacing movement to the platen and returning the carriage to line-starting position includes a handle 45 and a short arm. 46 pivotally connected as at 41 to one end of a link 48, the other end of the link being pivotally connected as at 48 to a rock arm 50 which carries a pawl 5| engageable with a ratchet wheel 52 secured to the platen. When the lever 4 is rocked in counter clockwise dibailstops- I. and I3" m that disclosed in the patent of the center stop 4 which performs the The parts referred to above may be of known construction and arrangement relative to each other, and, considered alone or in combination with each other, they do not constitute, the invention claimed herein. The invention resides in other parts to be described, and the combinations of such other parts with each other and with parts which previously have been described.

Equipment for positioning, feeding, and tensioning hektograph or similar strip ribbon in accordance with the present invention in general includes means generally designated D for providing a supply of ribbon 51, a positioning and tensioning device generally designated E shown at the right hand end of the carriage B, a ribbon positioning, holding, and preferably feeding device generally designated F and shown as mounted at the left of the carriage, and preferably ribbon take-up mechanism generally designated G and shown as mounted at the left of the frame A. In the operation of the positioning, feeding, and tensioning equipment considered generally, ribbon is drawn from the supply which includes means for yieldably resisting drawing off of the ribbon, and is then directed through the positioning and tensioning device E from whence the ribbon extends along and past the printing line of the platen and through the device F. The ribbon 51 then extends from the device F to the mechanism G, which is adapted to take up ribbon fed along and past the printing line of the platen during movement of the carriage in letter-spacing direction. When the carriage has reached the end of a typed line, the line-spacing lever 4 is operated in the usual manner to effect linespacing of the platen and return movement of the carriage. Through the instrumentality of'means later to be described, this movement of the linespacing lever releases. the holding device F and the positioning and tensioning device E from operative engagement with the ribbon, so as to permit the carriage to be returned to line-starting position without moving the ribbon bodily with the carriage.

When the line-spacing movement has been completed and the carriage returned. the tensionin device E will reengage the ribbon so as to exert a pull toward the right while the ribbon 68 is formed with separable lower and upper -flanges 88 and 81, respectively, and a removable core 88 which is adapted to be constrained to rotate with the lower flange 69 by means of a pin 69 fast with the lower flange and extending into an opening 89 in the core. Ribbon-51 is led from the spool 88 around a flanged guide roll 18 journaled on a swingable bracket arm H pivoted on the bracket 58 as at 12. From the roll the ribbon extends to the positioning and tensioning device E, and thence along the printing line of the platen.

The device E is mounted on a bracket 13 secured as atfi to the carriage B, and includes a plate 15 arranged to shift vertically on pins l8 and" secured to the bracket 13.

slide on a pin it, and a spring finger 19 carried by the plate 15 is engageable selectively with grooves 80 and 8! in the pin 18 for releasably holding the plate 75 in adjusted position. The extension 18 is formed with a horizontal projec-' tion 82 serving as a finger piece for facilitating is held against bodily movement by the take-up mechanism G, which at that time is inactive. When the carriage has been moved to position for the starting of a new line of typing and the line-spacing lever is released, the device F will reengage the-ribbon 51 and the ribbon positioning and tensioning device E will move a short distance toward the right to exert a pull upon and slightly stretch the length of ribbon extending between the devices E and F. Pulling of the ribbon taut at this time realigns the ribbon and removes any lateral shift which may have been imparted to the ribbon during the line-spacing operation, and assures that during the typing of the next line type impressions will be made only in a selected narrow ribbon zone.

Referring more particularly to the ribbon supply means D, a bracket 58 mounted on the main frame A'is provided with a spindle 59 on which is journaled a supply spool 60 held down against a spring friction washer 6| by means of a nut 62. A flat leaf spring 63 is pivoted as at 64 on the bracket 58 and is-held in frictional contact with the roll of ribbon 51 by means of a wrap spring 65. In order that the ribbon. after being used once, may be inverted so as to make a fresh zone available for typing impressions, the spool vertical adjustment of the plate 15. Movement of the plate to selected vertical positions serves to position the ribbon 51' so that it will be guided to present different selected ribbon zones for typing impressions.

A roll-mounting support in the form of a plate 83 is mounted on the plate 15 so as to shift in the direction of carriage movement. At one of its ends, the support 83 is formed with a slot 84 which receives a shouldered stud 85 secured to the plate I5, and at its other end the support 83, is formed with a slot 86 which receives a stud 81 carried by the vertically shiftabl plate 15. A spring 88 interposed between an ear 89 on the plate 83 and an car 90 on the plate 15 urges the plate 83 toward the right. that is, in a direction opposite the direction of letter-spacing and ribbon-feeding movement.

A flanged guide roller 9! journaled on a spindle 92 carried by the vertically shiftable plate 15 guides" the ribbon 51 to the printing line and directs it between two positioning'and tensioning clamping members or rolls 93 and 94 so dis-- posed as to discharge the ribbon along the print. ing line. 95 carried by the horizontally shiftable plate 83, and the roll 94 isjournaled on a spindle 96 supported on a bell crank lever 91 pivoted as at 98 on the plate 83. The arm 91 of the bell crank lever 91 is connected by means later to be described to the escapement-disabling mecha nism, so that the lever 91 will be rocked to separate the rolls 93 and 94 when the escapement rack is lifted. Normally, the clamping roll 94 is held up against the roll 93 by means of a spring 99 interposed between the lever arm 9'! and the horizontally shiftableplate 83. When the plate 83 and the rolls 93 and 94 supported thereon are shifted toward the right at the end of carriage return movement for tensioning the ribbon as previously referredto, the rolls will be maintained in clamping relation by the spring 99, and rotation of the rolls will be yieldably restrained by springs I09 and Ill! interposed respectively between the heads of the spindles and 98 and the associated rolls 93 and 94.

For unclamping the rolls 93 and 94 and positioning them preparatory to effecting the final clamping and tensioning operation; means are provided for shifting the plate 83 to the left, simultaneously moving the roll 94 away from the roll 93 and then bringing the roll 94 back into I The plate is formed with an upper extension 18 arranged to The roll 93 is journaled on a spindle cam lever is formed movement (toward the clam ing position. lever l02 is pivoted as at I03 on the plate 18 and is held in normal position against a stop pin I04 by aspring I05 interposed between the stud 81 and an ear I86 on the cam lever. The with an extended, inclined is disposed in the path of left) of a cam follower nose I08 on the bell crank lever 91. Figure 4 shows the parts in the positions occupied'before the movement of the plate 83 toward the left. As the plate 83 moved toward the left, the cam cam surface I01 which ,follower nose I09 willride up on the extended cam surface I01 so as to move the clampingroll 94 away from the roll 93.. Continued movement of the plate 83 finally will bring the cam follower nose I08 beyond the extended sam surface I01, whereupon the spring 99, by rocking the bell crank lever 91, will move the nose I03 behind the cam surface I01, the parts thus being brought to the relative positions shown in Figure 12 with the roll 94 in ribbon-clamping relation with respect to the roll 93. when, subsequently, the plate 83 is moved to the right for pulling the ribbon taut, the spring I06 will yield so as to permit rocking of the cam lever I02 and uninterrupted movement of the nose I03 without moving the roll 94 away from the roll 93. It will be understood that plate 83 is effected in timed relation to the linespacing operation and the placing of the carriage in line-starting position. The mechanism for effecting the timed relation will be described hereinafter. Y

The ribbon positioning, feeding, and holding device F includes two non-reversible rolls I09-I I 0 adapted to grasp the ribbon 61 extended to the left beyond the platen printing line. The roll I09 is mounted to rotate on a fixed spindle III carried by a plate II2 supported on an extension II3 of the carriage end plate 3. The roll I09 is equipped with a ratchet wheel II4 arranged to cooperate with a pawl II6 held by a spring H6 in the direction of the arrow a in Figure 6 but to prevent rotation in the opposite direction.

- The roll H0 is journaled on a spindle 1 carried by a bracket H3 fast with the line-spacing lever 4. The roll IIO is provided with a ratchet wheel I I9 co-operable with a pawl I urged by aspring I2I into engagement with the ratchet so as to permit rotation of 'the roll H0 in the direction of the arrow 0. iii-Figure 6 but to prevent rotation in the opposite direction. The line-spacing lever 4 and with it the bracket II8 are urged by a spring I22 interposed between the bracket and a stud I29 so as normally to maintain the roll H0 in clamping position with respect to the roll I09. When a line is being typed and the carriage is moving in letter-spacing direction,

the horizontal shifting of the so as to permit rotation of the roll in the form shown. a cam; rection of carriage travel in order to present selected longitudinal ribbon zones at the printin poin a designated I24 18 mounted at the left of the rolls. I09 and H0. This device includes a plate I23 equipped with a crosshead I23 embracing and being slidable upon a flat guide I21 extending down from the plate I22. The plate I25 is .equipped with a U-shaped ribbon guide I23 bethe rolls I09 and H0 will grip the ribbon 51, I

and, since the rolls cannot operate reversely to the directions indicated by the arrows a and a, the rolls will pull the ribbon 51 in the direction of the arrows b, so that fresh ribbon moves up to and beyond the printing point at exactly the same rate as the platen and work sheet 56. When the carriage is being returned to starting position, the line-space lever is rocked so as to hold the roll IIO separated from the roll I09, permitting the carriage to return without causing the rolls I0 9and IIO to ,tear or move the ribbon bodily in the direction of carriage return movement.

For shifting the ribbon transversely to the ditween the upper and ribbon 51 is positioned as shown in Figure '7. For maintaining the'ribbon in adjusted position, a spring detent I29 is secured to the plate.ll2 as at I34, and it is adapted to engage selectively notches HI and I32 formed in an ear I33 on the plate I26. A finger piece I34 on the plate I25 facilitates shifting of the guide I28. Upward shifting movement thereof is limited by engagement of the crosshead I26 with the bottom of the plate H2, and downward'shifting movement i limited by engagement of the crosshead I26 with a screw I35.

Referring now to the mechanism for operating the devices E and F in timed relation to each other and to the line-spacing-and carriage return operations, a link I36 is pivoted at one end as at I31 to an arm I38 on the bracket II8 carried by the line-spacing lever 4.'- The rear end ofthe link I36 is formed with a slot I39 which receives a pin I40 on a rock arm I secured to ashaft I42 .mounted on the rear ends of the carriage end plates 3 and 3'. The pin and slot I43 and I provide a lost motion connection between the line-space lever and the rock shaft I42. The right hand end of the rock shaft is provided with a rock arm I43 which is pivotally connected as at I44 to the rear end of a link I45, the front end of which is pivotally connected at I46 to a bell crank lever I41 pivoted as at I43 on the bracket 13. The bell crank lever I41 has an arm I49 provided with a long pin I50 received in .a slot I5I in the horizontally shiftabie plate 83. The length of the pin I50 is sufficient to assure continued engagement of the pin in the slot I5I when. the plate 15 is shifted'vertically to either of its-two positions for changing the zone of the ribbon to be presented at the printing point.

. In operation, when the line-spacing and car riage return lever 4 is rocked counterclockwise as viewed in Figure 4, the link I36 will be thrust rearwardly from the position shown in Figure 9 until the front end of the slot I39 engages the pin I40. During this idle or lost motion movement of the link I36, the line-spacing pawl 5| will have gone through'its idle movement.

Continued movement of the line-spacing lever will move the link I36 further rearwardly and rock the arm I and shaft I42 concurrently with line-spacing movement of the platen. This rocking of the shaft I42 will rock the arm I43 so as to pull the link I45 rearwardly, thereby rocking the bell crank lever I41 and moving the support plate 83 toward the left as viewed in Figure ,4. During this movement of the plate 33 and the rolls 93 and 94 supported thereon, the roll 94 will move away from the. roll 93. and, ,as previously described, will then return toward the roll 93 so as togrip the ribbon in the manner previously described. By this time the line-spacing movement of the lever 4 will have been completed, and further manual effort exerted on the lever will move the carriage in the return-direction while the rolls I09 and H0 of the device F are disengaged from the ribbon ribbon-shifting device generally lower flanges of which the -to line-starting position, the line-spacing lever 6 will be released, permitting theflspring I22 to return it to the position shown in Figure 4 with the rolls I09 and H gripping the ribbon 51.

This return movement of the line-spacing lever 6 will releasethe holding action of the lever 2,278,009 r v i driving spring barrel or drum meshes with a.

gear I16 fast on a shaft I11 journaled on a bracket I16 secured as 'at I19 to the mechanism frame "I. A bevel gear I60 fast on the shaft I11 meshes with a bevel gear I6I secured to a shaft I62 journaled-on the mechanism frame "I, and a bevel gear I63 fast on the shaft I62 meshes 1 with a bevel gear I36 secured by a setscrew I65 to the mechanism frame "I.

I61 upon the shiftable plate 63 so as to permit 93 and 96 carried thereby toward the right, thus effecting the desired flnalstretching of the ribbon preparatory to typing a newline.

Means are provided for releasing the rolls I09 and H0 of the device F and the rolls 93 and 96 of the device Ewhen the carriage escapement mechanism is disabled. In the form'shown, this means includes an arm I52 pivoted as at I53 on the carriage end plate 3, and projecting over the bail bar 39. Fast with the arm I52 is a vertically extending arm I56 provided with a pin I65 received in a slot I56 in the link I36. An arm I51 pivoted on the carriage endplate 3' as at I56 extends over the bail bar 39 and is formed with a vertically extending handle I59 which is pivoted as at I60 to one end of a' link I9I, the'other end of which is pivoted at I62 to the arm 91 of the bell crank 'lever.91. Lifting of the escapement rack I0 by depression of one of the rack release levers I3-I3' or by de-' pression of the tabulating key 29 will liftthe arms I52 and I51. Lifting of the arm I52 will rock the extension I56. causing the pin I56 to push the link I36 rearwardly, thus rocking the shaft I62 and shifting the plate 63 and rollers facilitate introduction of the ribbon between them without separating the rolls I09 and I I0.

The take-up mechanism G, considereddn its most general nature; is similar to the take-up mechanism disclosed in the co-pending application of George'F. Handley filed July 20, 1939, Serial No. 285,598. As embodied in the present construction, the take-up mechanism G receives the ribbon which passes from the positioning guide I26 around a flanged guide pulley I63 mounted on an arm I66 which is swingable. about a pivot I65 on a bracket 866 supported on the main frame. tends around a flanged guide roll I61 supported bya bracket I66 carried on the bracket I66. The ribbon extends downwardly from the roll I61 and around a flanged roll I69 journaled on a bracket I10 supported by a take-up mechanism frame I11 attached to the main frame as at I12. The ribbon extends from the roll I69 to a take-up roll spool I13 mounted to turn freely on a shaft I16 journaled in the mechanism frame I1I.

Connections interposed between the take-up roll I13 and the carriage B provide for driving the take-up roll during letter spacing movement of the carriage but not during return movement From the roller I63 the ribbon ex the spring 66 to pull the plate 63 and the rolls 7 a sleeve m. M shown in Figure 20 the sleeve I36 extends through a bracket I61 mounted on A clutch element I36 secured to the sleeve I66 by a set screw I69 cooperates with the gear 136 for holding the sleeve I66 against axial movement. A shaft I90 isprovided with a reduced upper end portion I9-I which is received for free rotation within the sleeve I66. A shoulder I92, at the juncture of thebody portion of the shaft I90 and the reduced end portion I9I, and acollar I93, at the top of the reduced end portion I9I, engage opposite ends of the sleeve I66 for holding, the shaft (90 against axial movement,

A toothed ratchet clutch element I96 is mounted to slide on the shaft I90 but is constrained to rotate therewith by means of a pin I95 received in a slot I96 formed in a collar I91 secured to the shaft I90 by means of a set screw I96. A spring I99 interposed between the collar I91 and the clutch element I96 urges and normally maintains is urged by a spring 209 into yielding engagement with a serrated wheel 2I0 secured to, the

' take-up spool I13. When the carriage is moved in letter spacing direction, drive will be transmitted, through the gearing and clutch device I96-200-I96 to the shaft I16, causing the arm 206 and pawl 206 carried thereby to rotate in a direction tending to rotate the take-up spool I13 in the direction of the arrows c in Figures 3, 9, and 10. The ratio of the gearing between the carriage and the shaft I16 is such that the shaft tension so that the ribbon will be wound snugly thereof. A gear I15' secured to the carriage-J5 upon the take-up roll. The teeth on the wheel 2I0 have the same angle or inclination on each side, the angle being such that there is no positive drive connection between the pawl 206 and the serrated wheel. The serrations or teeth provide for greater frictional driving contact between the pawl and the teeth than would be provided if the periphery of the wheel 2I0 were smooth. Thus the pawl 206 drives the take-up spool frictionally to maintain the ribbon 51 taut, yet the pawl can be cammed up by the'inclined tooth or serration surfaces to permit relative slipping between the pawl and serrated wheel end thrust is exerted upon the spool.

During carriage return movement the clutch elements I99 and 299 will rotate reversely with the element 299 slipping idly over the teeth of the element I94 and transmitting no drive thereto. To prevent reverse rotation of the take-up spool drive clutch. The parts shown in this modiflcation are the same as those forming the clutch shown in Figures 10 and with the exception that the clutch disc I99 in the modification is formed with rigid teeth I99 instead of being provided with a spring clutch pawl 299 as spool I13 a back check pawl 2II pivoted as at 2I2 on the mechanism frame I1I is urged by a spring 2I3 into engagement with a fine toothed ratchet 2I4 secured to the take-up spool.

In order that the ribbon may be removed from the take-up spool I13 after it has been completely wound thereon and returned to the supply spool 99 preparatory to feeding the ribbon along the writing line again with a fresh ribbon zone presented for typing, the take-up spool I19 is formed with separable spaced discs 2 I9-2I9 and a removable winding core 99 fitted over the hub 2I9 of the disc 2I9. The core is constrained to rotate with the disc 2I9 by means of a pin 2" extending into the opening 99 in the core. A collar 2I9 held fast to the shaft I14 by a set screw 2I9 is formed with an annular groove 229 adapted to receive a pin 22I carried by a spring 222 secured to a finger knob 223. Preferably, the knob 223 is secured to the'disc 2I9, so that, when the pin 22I is withdrawn from the groove 229, the

' knob 223 anddisc 2I9 may be removed as a unit,

after which the core 99 and the ribbon wound thereon may easilybe removed and transferred to the supp y spool 60.

As previously described, the rolls of the devices E and F are released from the ribbon when the tabulator key 29 is "depressed so as not to feed ribbon during the tabulating operation. In order to prevent the take-up spool from drawing ribbon from the supply during tabulating operations', means are provided for disengaging the clutch elements 299 and I94 when the tabulating key is depressed. A rock shaft 224 is journaled On the frame A as at 229 and 229 and is provided at one end with an arm 221 which is pivoted at 229 to a link 229 the lower end of which is formed with a loop 239 which receives in the embodiment previously described.

When the carriage has been moved to the left considerably beyond the position shown in Figure 1, the ribbon 91 will extend from the framemounted guide roll 19 in front of the axis of the platen C and beyond the right-hand end of the platen. -If the platen-rotating knob were secured to the platen shaft 49 to rotate about the same axis as the platen, as is customary, the knob would be disposed immediately behind and close to the ribbon 91. In such position it would be diflicult for the operator to manipulate the knob without disturbing the ribbon and, even if the operator were careful not to touch the ribbon with the fingers, the operators sleeve or cut! would be apt to brush against the ribbon. In ac- .cordance with the invention, this dimculty is terposing driving connections between the knob and the platen shaft. In the form shown the shaft 49 is provided with an axial extension 49' whichis journaled as at 24924I' on an extension 242 of the bracket 13. A gear 243 fast with the platen shaft extension 49'- meshes with an idler gear 244 carried by a pintle 249 supported by a pin 231 on the tabulating key lever 29. An

arm 232 secured to the rock shaft 224 is pivotally connected at 233 to the front end of a link 234,

the rear end of which is pivotally connected at 239 to a lever 239 fulcrumed as at 231 on the mechanism frame "I. The lever 299 carries a pin 239 which extends above the flange I94 of the clutch element I94. A spring 239 connected to the lever 239 normally holds the lever in position with the pin 239 elevated so as to relieve pressure on the flange I94 and permit the spring I99 to hold the clutch element I94 in operative engagement with the clutch pawl 299. When the tabulating key lever 29 is depressed, the pin 23I will engage the bottomof the loop 239 so as to move the link 229 downwardly and rock the arm 221, the shaft 224, and the arm 232 so as to pull forwardly on the the lever 239 and cause the pin 239 carried thereby to push downwardly on the flange I94 so as to move the clutch element I94 to the Figure 20 position out of engagement with the clutch pawl 299. Thus, movement of the carriage in the letter-spacing direction during tabulating operations will not transmit drive to the take-up spool I19.

Figure 16 shows a modified form of take-up the bracket extension 242. The idler gear 244 meshes with a gear 249 fast with a shaft 241 which carries the platen rotating knob 249. As

showninFigure5the knob 249isdisposedwell above the ribbon 91 and may be manipulated readily without danger of disturbing the desired precise alignment of the ribbon.

Operation To prepare the machine for operation the brackets H and I94 are swung to position the flanged guide rolls 19'and I93 as shown in Figure 1. Ribbon 91 from the supply spool 99 is lead around the flanged rolls 19 and 9I. The handle I99 is pushed rearwardly to rock the bell crank lever 91 and move the roll 94 of the device it away from the roll 99 after which the ribbon is threaded between the rolls 94 and 93 and is trained along the printing line of the platen.

,The line spacing lever 4 is moved just suiflciently ribbon is threaded through the U-shaped guide link 234. This will rock I29, thence successively around the flanged rolls I93, I91, and I99 and thence to the take-up spool I13. The latter may be given several turns manually in order to secure the end of the ribbon to the core 99 and to provide initial tensioning of the length of ribbon extending between the take-up spool and the feeding device F. Movement of the ribbon toward the left effected by manual rotation of the take-up spool I13 can take place without opposition by the mils I99- H0, since these are free turn in the directions of the arrows a and a in Figured. One of the carriage release levers I9 01'. I9 is depressed to raise the rack i9 and thus free the escapement mechanism,.at the same time separating the rolls of the devices E and F. The

carriage is then moved freely in the letter-spacing direction to test the retarding drag on the spool 90, which should-be sufficient to prevent the take-up spool I19 from being driven to draw ribbon from the supply spool. The proper ad- Justment is eflected by tightening the thumb nut 92 until the supply spool 90 will hold the ribbon 51 and the take-up spool 'I 19 with sufiicient force to cause the driving pawl 209 to slip on the ratchet 2i 0.

Typing is thenperformed in the usual manner,

. and as'the carriage moves in the letter-spacing direction the rolls I09 and I I of the device F, being unable to rotate reversely, will pull the ribbon 91 along with the platen. The ribbon extending to the left beyond the device 1'' will be maintained under tension and rolled up by the take-up spool I13 as previously described.

If,' during the writing of a line, a tabulating operation is performed, depression of the tabulator key lever 29 will move rolls 94 and I99 respectively away from the rolls 93 and H0 and, at the same time, will interrupt the drive to the take-up spool I19, thus permitting the carriage to move freely without feeding ribbon past the passed beyond the cam surface extension I91,

whereupon the roll 94 will move back to return movement of the device E, together with the -carriage, will impart a preliminary tensioning to the ribbon. When the line-spacing lever 4 is released and returned to its normal position by the spring I22, the spring 99 of the device E will pull-the plate 99 toward the right from the printing point while no type impressions are being made, thereby avoiding waste. Movement of the carriage in either direction with the escapement mechanism disabled in the manner previously described will not effect any feeding of the ribbon 51. If the carriage is being moved in the return direction, the clutch pawl 200 will slip idly over the clutch element I94 so as not to rotate the shaft I90 and the shaft I14. When the carriage is moving freely in the letter-spacing direction .with the Iescapement mechanism disabled, the shafts I90 and I14 will be driven from the spring drum 6 and connecting gearing and clutch 209-494, but the take-up spool I13 will be held against turning by the friction exerted on the supply spool '90, so that the take-up spool will remain stationary while the pawl 209 slips idly over the ratchet wheel 2I0. If at any time it is desired to move the carriage in the return direction without imparting line-spacing movement to the platen, any fixed part on the carriage, such as the platen-rotating knob 248, may be pressed toward the operator's right. This will not separate the roll I I0 from the roll I09, but the ribbon 51 nevertheless will not be torn because the rolls I09 and H0 are free to rotate in the directions of the arrows a and a shown in Figure 6.

When the typing of the line has been completed, the line-spacing lever 4 is rocked so as to effect line-spacing 'movement of the platen and return movement of the carriage in the usual manner. Movement of the line-spacing lever will first move the roll IIO of the device F away from the roll I09 and disengage the roll IIO from the ribbon. Further movement of the lever 4 will effect line-spacing of the platen and will push the link I39 rearwardly to rock the shaft I42, pull the link I45 rearwardly, rock the bell crank lever I41, and shift the plate 93 from the position shown in Figure 4 toward the left. During this movement of the plate 89 the roll 94 of the device E will be moved away from the roll 95 until after the nose I09 of the lever 91 has position shown in full lines in Figure 12 to the position shown in dotted lines in Figure 12 andin full lines in Figures 1 and 4. This final movement. of the plate "and rolls 99 and 94 will exert a final pull on the ribbon 51. which is held against bodily movement at the left-hand end of the platen, so that the ribbon will be stretched slightly and straightened out, thus correcting any disturbance of the alignment of the ribbon caused by line-spacing movement of the platen and work sheet 59.

Because of the very accurate aligning of the ribbon preparatory to the starting of each new line of typing made possible by the final tensionlng of the ribbon described above, typing may be performed separately in three distinct, narrow, longitudinal ribbon zones, I, II, and 111, without danger of overlapping of type impressions. When a new ribbon is used, the ribbon guiding device E may be set as indicated in full lines in Figures 5 and ,13. wherein the vertically shiftable plate 16 and parts carried thereby are in their lower positions. The ribbon guide I24 at the left of the carriage also will be set in its lower position, as shown in full lines in Figure 7.

The ribbon will then be so positioned as to present the central zone I along the printing line, as indicated in Figure 13. When the central zone of the ribbon has been used completely, the

' core 69 is removed from the take-up spool I13 and placed in the supply spool 90 without being inverted, and the ribbon again is threaded through the guides which, however, are now moved to their upper positions as indicated in dotted lines in Figures 5 and 7, respectively. The ribbon will then be guided so that the zone designated II will be fed along the printing line. After zone 11 has been used completely, the core 68 with the ribbon thereon again is removed from the take-up spool I13 and returned to the supply spool 90, but this time it is inverted on the supply spool and is threaded through the guides so that the zone designated III will be presented along the printing line.

The ribbon positioning; feeding, and tensioning mechanism disclosed herein may be applied easily to a standard machine to adapt the machine for use in hektograph or photo-offset work.

A machine equipped with the mechanism can be conditioned or adapted quickly for ordinary typing without the removal of any parts. The

- mechanism disclosed herein embodies the invena carriage mounted thereon for letter-spacing and return movements; a platen mounted on the carriage; means for mounting a ribbon supply on the frame and for directing ribbon from the supply along the writing line of the platen to be ifed in the direction of carriage letter-spacing movement; a pair of rolls journaled ,on the carriage to move in advance of the platen during letter-spacing movement, said rolls being adapt-- ed to grip the ribbon; a reverse-rotation-preventing device connected to at least one of said rolls to' hold said rolls from turning when the carriage is moved in letter-spacing direction whereby said rolls will pull the ribbon along with the carriage and platen during letter-spacing, said device permitting tree rotation of said rolls during carriage return movement and with the rolls in gripping engagement with the ribbon; and ribbon take-up means for preventing movement of the ribbon in carriagereturn direction.

2. In a typewriter or like machine, a frame;

a carriage mounted thereon for letter-spacing and return movements; a platen mounted on the carriage; means for mounting a ribbon supply on the frame and for directing ribbon from the supply along the writing line of the platen to be fed in the direction of carriage letter-spacing movement; a pair of rolls journaled'on the carriage to move in advance of the platen during letter-spacing movement, said rolls being adapted to grip the ribbon; a pawl and ratchet device connected to at least one of said rolls tohold said rolls from turning when the carriage is moved in letter-spacing direction whereby said rolls will pull the ribbon along with the carriage. and platen during letter-spacing, said device permitting free rotation of said rolls during carriage return movement and with the rolls in ppin engagement with the ribbon; and ribbon take-up means for preventing movement of the ribbon in carriage return direction.

3. In a typewriter or like machine, a frame; a carriage mounted thereon for letter-spacing and return movements; a platen mounted on the carriage; a carriage return lever; means for mounting a. ribbon supply on the frame and for directing ribbon from the supply along the writing line oi the platen to be fed in the direction of carriage letter-spacing movement; a pair, of rolls joumaled on the carriage to move in advance of the platen during letter-spacing movement, said rolls being adapted to grip the ribbon; means movable in response to operation of the carriage return lever for shifting one of said rolls away from the other roll to release the ribr bon; a reverse-rotation-preventing device connected to at least one of said rolls to hold said rolls from turning when the carriage is moved I in letter-spacing direction whereby said rolls will pull the ribbon along with the carriage and platen during letter-spacing, said device permitting free rotation of said rolls during carriage return movement and with the rolls in gripping engagement with the ribbon; and ribbon take-up means for preventing movement of the ribbon in carriage return direction.

4. ma typewriteror like machine, a traveling carriage; a platen thereon; means mounting a ribbon supply and training a, length of ribbon along'the writing line of the platen; means for feeding ribbon along said writing line in one direction; and means operable after movement of the carriage to line-typing starting position and stopping of the carriage in such position for applying tension to the ribbon extending along the writing line oi the platen.

5. In a typewriting or like machine, a frame; a carriage mounted for letter-spacing and return movements thereon; a platen mounted on the carriage; means mounting a ribbon supply on the machine; and means for positioning, guiding, and tensioning ribbon along theiwriting line of the platen including a device at oneend of the machine adapted to prevent movement of the ribbon toward the other end of the machine, and a device at said other end of the machine operable after movement of the carriage to linetyping starting position and stopping of the carriage in, such position for pulling toward said other end the ribbon extending between said two devices.

6. In a typewriting or like machine, a frame; a carriage mounted for letter-spacing and return movements thereon; a platen mounted on the carriage; means mounting a ribbon supply on the machine; means for positioning, guiding, and tensioning ribbon along the writing line of the platen including a device at one end of the machine adapted to prevent movement of the ribbon toward the other end of the machine, and a device at said other end of the machine-operable after movement of the carriage to linetyping starting position and stopping or the carriage in such position for pulling toward said other end the ribbon extending between said two devices; and means for shifting said ribbon positioning, transversely to the direction of extent of the ribbon between said twodevices.

7. In a typewritlng or like machine, a frame; a carriage mounted for letter-spacing and return movements thereon; a platen mounted on the carriage; manually operable means for effecting return movements of the carriage; means mounting a ribbon supply on the machine; means for feeding ribbon from said supply and for preventing reverse movement or the ribbon; and

means operable in response to releasing of said manually operable means after positioning of the carriage at rest in line-typing starting position for stretching the ribbon while it is held by the reverse-movement-preventing means.

8. In a typewriting or like machine, aframe; a carriage mounted for letter-spacing and return movements thereon; a platen mounted on other end of the machine and between which the ribbon extends; and means for shifting said clamping members in a direction to exert a pull on that length of ribbon which extends from the clamping members to said non-reversible means.- l

9. In a typewriter or like machine, a traveling carriage; a platen thereon; a linespacing actuator connected to said platen; means mounting a ribbon supply and training a length of ribbon along the writing line of the platen; means for feeding ribbon along said writing line in one direction; and means responsive to releasing and returning oi the line-spacing actuator to inactive position for applying tension to the ribbon extending along the writing line of the platen.

l0. In a typewriter or like machine, a carriage mounted for letter-spacing and return moveguiding, and tensioning means aaraooe ments; a platen mounted on the carriage; mechnism for imparting line-spacing movements to a work sheet positioned in cooperative relation to said platen; a ribbon supply; means for feeding ribbon in cooperative relation to the platen; means for maintaining the ribbon under tension during carriage return movement; and means responsive to line-spacing operation of said mechanism and return thereof to inactive position for applying increased tension to the ribbon.

11. In a typewriter or like machine, a carriage mounted for letter-spacing and return movements; a platen mounted on the carriage for line-spacing movements; a line-space actuator connected to the platen; a ribbon supply; means for feeding ribbon in cooperative relation to the platen; means for maintaining the ribbon under tension during carriage return movement;

and means responsive to movement of the linespace actuator for applying increased tension to the ribbon after completion of carriage return movement.

12. In a typewriter or like machine, a carriage mounted for letter-spacing and return movements; a platen mounted on the carriage; a ribbon supply; means for feeding ribbon toward one end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a,

clamping device mounted on the carriage at the other end of the machine; means for effecting disengagement of said-device from said ribbon; and means foreflecting operative clamping engagement of said device with said ribbon and effecting movement of said device aiter completion of carriage return movement for pulling on and tensioning a length of ribbon extending past the platen.

13. In a typewriter or like machine, a carriage mounted for letter-spacing and return movements; a platen mounted on the carriage; a ribbon supply; means for feedingribbon toward one end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a support movably mounted on said carriage; a pair of separable clamping members carried by said support and between which the ribbon extends; means for selectively effecting separation and clamping engagement of said clamping members; means formoving said support and the separated clamp-r ing members with respect to the ribbon in the direction of ribbon feed; and means for moving the I support and engaged clamping members in the opposite direction for pulling the ribbon in said opposite direction.

14. In a typewriter or like machine, a carriage mounted for letter-spacing and return movements; a platen mounted on the carriage; a ribbon supply; means for feeding ribbon toward one end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a support movably mounted on said carriage; a pair of separable clamping rolls carried by said support and between which the ribbon extends; means for selectively effecting separation and clamping engagement of said clamping rolls; means for moving said support and the separated clamping rolls with respect to the ribbon in the direction of ribbon feed; and means for moving the support and engaged clamping rolls in the opposite direction.

for pulling the ribbon in said opposite direction. 15. In a typewriter or like machine, a carriage mounted for letter-spacing and return movements; a platen mounted on the carriage; a ribbon supply; means for feeding ribbon toward one end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a support movably mounted on said carriage; a pair of separable clamping rolls carried by said support and between which the ribbon extends; means for selectively efiecting separation and clamping engagement of said clamping rolls; means for moving said support and the separated clamping rolls with respect to the ribbon in the direction of ribbon feed; means for moving the support and engaged clamping rolls in the opposite direction for pulling the ribbon in said opposite direction; and means for yieldably restraining rotation of one of said rolls.

between which the ribbon extends; means for selectively effecting separation and clamping engagement of said clamping rolls; means for moving said support and the separated clamping rolls with respect to the ribbon in the direction of ribbon feed; means for moving the support and engaged clamping rolls in the opposite direction for pulling the ribbon in said opposite direction; and a spring contacting one of said rolls for yieldably restrainingrotation of said rolls.

1'7. In a typewriter or like machine, a carriage mounted for letter-spacing and return movements; a platen mounted on the carriage; a ribbon supply; means for feeding ribbon toward one end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a clamping device mounted on the carriage at the other end of the machine; means for efiecting disengagement of said device from said ribbon; and spring means for eflecting operative clamping engagement of said device with said ribbon and effecting movement of said device after completion of carriage return movement for pulling on and tensioning end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a support movably mounted on said carriage; a pair of sep-' arable clamping members carried by said support and between which the ribbon extends; releasable manually operable means for separating said members and movingthe support and the members with respect to the ribbon in the direction of ribbon feed; a spring for then eflecting clamping engagement of said members with said ribbon; and means responsive to releasing of the manually operable means for moving the support and the clamping members in the opposite direction with the ribbon clamped between said clamping members.

19. In a typewriter or like machine, a carriag'e mounted for letter-spacing and return movements; a platen mounted on the carriage; a combined line-spacing and carriage return lever mounted on the carriage and being connected to the platen; a ribbon supply; means for feeding ribbon toward one end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a support movably mounted on the carriage; a pair of separable clamping members carried by said support and between which the ribbon extends; operative connections between said lever and said support for moving the support in the direction of ribbon feeding when said lever is moved to efiect line-spacing; means for separating said clamping members during said movement of said support and said members; means for effecting clamping engagement of said members after said movement of said support and members; and means operable in response to releasing of said lever for moving said support and said clamping members in the opposite direction to exert a pull on said ribbon.

20. In a typewriter or like machine, a carriage mounted for letter-spacing and return movements; a platen mounted on the carriage; a combined line-spacing and carriage return lever mounted on the carriage and being connected to the platen; a ribbon supply; means for feeding ribbon toward one end of the machine in cooperative relation to the platen and for preventing bodily movement of the ribbon in the reverse direction; a plate movably mounted on the carriage; a pair of separable clamping rolls carried by said plate and between which the ribbon extends; operative connections between said le- 1 ver and said plate for moving the plate in the direction of ribbon feeding when said lever is moved to effect line-spacing; a cam device for I separating said clamping rolls during said movement of said plate and said rolls; a spring for effecting clamping engagement of said rolls after said movement of said plate and rolls; and a spring operable in response to releasing of said lever for moving said plate and said clamping rolls in the opposite direction to exert a pull on said ribbon.

21. In a typewriter or like machine, a frame; a carriage mounted thereon for letter-spacing and return movements; a platen mounted on the carriage; a combined line-spacing and carriage return handle mounted on the carriage; a ribbon supply mounted on the frame; means for guiding ribbon from one end of the machine along the printing line of the platen; means at the other end of the machine for feeding ribbon and for preventing reverse movement of the ribbon; a support mounted on. the carriage at said firstnamed end of the machine for movement relative to th carriage in the directions of carriage travel; a first roll joumaled on said support; a lever pivoted on said support; a second roll journaled on said lever and being adapted to clamp the ribbon against said first roll; connections between said handle and said support for shifting the support in the direction of ribbon feeding in response to line-spacing movement of said handle; a cam for rocking said lever to separate said rolls during such movement of the support; a spring connected to said lever for rocking it to bring said second roll to ribbon-clamping position after said movement of the support; and a spring effective in response to return'of the handle to normal position for moving said support oppositely to the direction of ribbon feed-' and return movement's; aplaten mounted on the carriage; a combined line-spacing and carriage return handle mounted on the carriage; a ribbon supply mounted on the frame; means for guiding ribbon from one end of the machine along the printing line of the platen; means at the other end of the machine for feeding ribbon and for preventing reverse movement of the ribbon; a support mounted on the carriage at said firstnamed end of the machine for movement relative to the carriage in the directions of carriage travel; a first roll journaled on said support; a roll-carrying lever pivoted on said support; a second roll journaled on said roll-carrying lever and being adapted to clamp the ribbon against said first roll; connections between said handle and said support for shifting the support in the direction of ribbon feeding in response to linespaoing movement of said handle, said connections including a bell crank lever pivotally mounted on said carriage and having one arm connected to said support, a rock shaft mounted on said carriage and extending in the direction of carriage movement, rock arms secured to opposite ends of said shaft respectively, a link connection between said handle and one of said rock arms, a

and a link connection between the other arm of said bell crank lever and the other of said rock arms; a cam for, rocking said roll-carrying lever to separate said rollsduring such movement of the support; a spring connected to said rollcarrying lever for rocking it to bring said second roll to ribbon-clamping position after said movement of the support; and a spring effective in response to return of the handle to normal position for moving said support oppositely to the direction of ribbon feeding.

23. In a typewriter or like machine, a frame;

a carriage mounted thereon for letter-spacing and return movements; a platen mounted on the carriage; a combined line-spacing and carriage return handle mounted on the carriage; a ribbon supply mounted on the frame; means for guiding ribbon from one end of the machine along the printing line of the platen; means at the other end of the machine for feeding ribbon and for preventing reverse movement of the ribbon; a support mounted on the carriage at said first-named end of the machine for movement relative to the carriage in the directions of carriag'e travel; a first'roll journaled on said support; a lever pivoted on said support; a second roll journaled on said lever and being adapted to clamp the ribbon against said first roll; connections between said handle and said support for shifting the support in the direction of ribbon feeding in response to line-spacing movement of said handle; -a cam lever pivotally mounted on said carriage and having an extended cam surface; a cam follower nose on said roll-carrying lever adapted to ride said cam surface during such movement of said support to separate said rolls; a stop for holding said cam lever stationary while said nose is riding said cam surface; a spring for yieldably holding said cam lever against said stop; a spring for moving said roll-carrying lever to bring said nose behind the extended cam surface after said nose has passed beyond it and thus to rock said roll-car, rying lever to bring said second roll to ribbon clamping position; and means for moving said support, said roll-carrying lever, and said rolls oppositely to the direction of ribbon feeding, said cam lever being rocked by and moved out of the path of said nose to permit the movement of aaraooa said rolls to take place without separation of means; frame-mounted means for supplying ribbon at one end of the machine; frame-mounted means at the other end of the machine for taking up ribbon from the supply; pairs of ribbon-clamping rolls mounted 'on the carriage at opposite ends of the platen for training the ribbon along the writing line of the platen; means for normally maintaining the rolls of each pair in ribbon-clamping relation to the other rolls of the respective pairs; and means for separating the rolls of each pair in response to opera- "tion of the carriage-returning means.

25. In a. typewriter or like machine, a frame; a carriage mounted thereon for letter-spacing and return movements; carriage -returning means; frame-mounted means for supplying-ribbon at one end of the machine; frame-mounted means at the other end of the machine for taking up ribbon from the supply; pairs of ribbonclamping rolls mounted on the carriage at onposite ends of the platen for training the ribbon along the writing line of the platen; means for normally maintaining the rolls of each pair in ribbon-clamping relation to the other rolls of the respective pairs; means for separating the rolls of each pair in response to operation of the carriage-returning means; and a pawl and ratchet device associated with one of the rolls at the end of the platen adjacent the ribbon-feeding means for preventing reverse rotation of'said rolls.

26. In a typewriter or like machine, a frame; a carriage mounted thereon for letter-spacingand return movements; carriage escapement mechanism; means fOr disabling the escapement mechanism; frame-mounted means for supplying ribbon at one end of the machine; framemounted means at the other end of the machine for taking up ribbon from the supply; pairs of ribbon-clamping rolls mounted on the carriage at opposite ends of the platen for training the ribbon along the writing line of the platen; means for normally maintaining the rolls of each pair in ribbon-clamping relation to the other rolls of the respective pairs; and means responsive to operation of the-carriage escapement disabling means for separating said rolls.

27. In a typewriter or like machine, a frame; a carriage-mounted thereon for letter-spacing and return movements; carriage escapement mechanism; means for disabling the escapement mechanism; carriage-returning means; framemo'unted means for supplying ribbon at one end of the machine; frame-mounted means at the other end of the machine for taking up ribbon from the supply; pairs of ribbon-clamping rolls mounted on the carriage at opposite ends ofthe platen for training the ribbon along the writing line of the platen; means for normally maintaining the rolls of each pair in ribbon-clamping relation to the other rolls of the respective pairs; means for separating the rolls of each pair; and connections between said roll-separating means, said escapement disabling means, and said carriage-returning means for operating said rollseparating means in response to operation of either the escapement-disabling means or the carriage-returning means- 1 28. In a typewriter or like machine, a frame; a carriage mounted thereon for letter-spacing and 1 return movements; carriage escapement mechanism; means for disabling the escapement mechanism; carriage-returning means; framemounted means for supplying ribbon at one end of the machine; frame-mounted means at the other end of the machine for taking up ribbon from the supply; pairs of ribbon-clamping rolls mounted on the carriage at opposite ends of the platen for training the ribbon along the writing line of the platen; means for normally maintaining the rolls of each pair in ribbon-clamping relation to the other rolls of the respective pairs; means for separating the rolls of each pair; and connections between said roll-separating means, said escapement-disabling means, and said carriage-returning means for operating said rollseparating means in response to operation of either the escapement-disabling means or the carriage-returning means, said connections including lost motion means for transmitting movement' from said carriage-retuming means to said roll-separating means without producing effec: tive operation of said escapement-disabling means and for transmitting movement from said escapement-disabling means without producing eifective movement of said carriage-returning means.

29. In a typewriter or like machine, a frame; a carriage mounted thereon for letter-spacing and return movements; tabulating mechanism; frame-mounted means for supplying ribbon at one end of the machine; frame-mounted means at the other end of the machine for taking up rolls of each pair in response to operation of th tabulating mechanism.

30. In a typewriter or like machine, a frame;

a carriage mounted thereon for letter-spacing and return movements; frame-mounted means for supplying ribbon atone end of the machine;

of each pair in ribbon-clamping relation to the' other rolls of the respective pairs; and means for simultaneously rendering the ribbon take-up means inactive and separating the rolls of each pair.

31. In a typewriter or like machine, a frame; a carriage mounted thereon. for letter-spacing and return movements; carriage escapement mechanism including a liftable rack; a platen mounted on the carriage; a combined line-spacing and carriage return handle mounted on the carriage; a ribbon supply mounted on the frame; means for guiding ribbon from one end of the machine along the printing line of the platen; means at the other end of the machine for feeding ribbon and for preventing reverse movement of the ribbon; a support mounted on the carriage at said first-named end of the machine for movement relative to the carriage in the directions of carriage travel; a first roll journaled on said support; a lever pivoted on said support; a second roll journaled on said lever and being adapted to clamp the ribbon against said first roll; connections between said handle and said of the support; a spring connected to said lever for rocking it to bring said second roll to ribbonclamping position after said movement of .the support; a spring effective in response to return of the handle to normal position for moving said support oppositely to the direction of ribbon feeding; and connections between said roll-carrying lever and said escapement rack for rocking said lever to separate said rolls in response to lifting of said rack and independently of movement of said support.

32. In a typewriter or like machine, a frame; a traveling carriage thereon; a platen on said carriage; means for training ribbon along the writing, line of the platen and for frictionally opposing feeding of the ribbon; a ribbon take-up spool; and operating connections between the carriage and the take-up spool for impositively driving the latter, said connections including a toothed or serrated wheel element and a cooperating slip pawl element, one of said elements being connected to said take-up spool and the other of said elements being adapted to be frictionally and impositively driven only in one direction in response to carriage movement.

. said take-up spool and the other of said elements being adapted to be frictionally and impositively driven only in one direction in response to carriage movement.

34. In a typewriter or like machine, a frame; a carriage mounted thereon for letter-spacing and return movements; a platen on the carriage; means mounting a supply of ribbon on the frame; means training ribbon from said supply along the platen to extend from the supply in the direction of letter-spacing movement; a pair of non-reversible rolls on the carriage f0; grasping ribbon and drawing it along with the platen during letter-spacing movement; a take-up spool mounted on the frame for taking up ribbon extended from the supply past the platen and said ribbon-grasping rolls; and means providing impositive friction drive connection between the carriage and take-up spool for driving the latter during letterspacing movement.

35. In a typewriter or like machine, a frame; a carriage mounted thereon for letter-spacing and return movements; a platen on the carriage; means mounting a supply of ribbon on the frame; means training ribbon from said supply along the platen to extend from the supply in the direction of letter-spacing movement; a pair of 1 non-reversible rolls on the carriage for grasping ribbon and drawing it along with the platen during letter-spacing movement; means for rendering said ribbon-grasping rolls ineffective; a takeup spool mounted on the frame for taking up ribbon extended from the supply past the platen and said ribbon-grasping rolls; means providing impositive friction drive connection between the carriage and take-up spool for driving the latter during letter-spacing movement; and means for frictionally resisting drawing of ribbon from said supply with suflicient force to prevent rotation of the take-up spool when said ribbon-grasping rolls have been rendered ineffective and said carriage is moved in letter-spacing direction.

- GEORGE F. HANDLEY.

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