US1127931A - Type-writing machine. - Google Patents

Description

A. W. SMITH.

TYPE WRITING MACHINE.

APPLICATION FILED JUNE 17, 1913 Patented Feb. 9, 1915.

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HEATTEIR'NEY A. W. SMITH.

TYPE WRITING MACHINE.

APPLICATION IILED JUNE 17, 1913.

PatentedFeb.9,1915.

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Y M M HISATTEIRNEY A. W. SMITH.

TYPE WRITING MACHINE.

APPLIOATION FILED JUNE 17, 1913.

Patented Feb. 9, 1915.

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HIEATTURNEY lug ARTHUR W. SMITH, OF NEW YORK, N. Y., ASSIGNOR TO REMINGTON TYPEWRITER COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEXV YORK.

TYPE-WRITING MlACI-IINE.

Application filed June 17, 1913.

To all whom it may concern:

Be it known that I, ARTHUR W. SMrrn, citizen of the United States, and resident of the borough of Manhattan, city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in 'lype-Vriting Machines, of which the following is a specitication.

My invention relates to typewriting and similar machines, and more particularly to the ribbon mechanism of such machines.

My invention has for its principal object to provide improved ink ribbon mechanism, including a ribbon vibrator mechanism for a visible typewriter, ribbon feed mechanism and guiding means. The ribbon vibrator preferably acts also as a type guide but this fact is not essential to some of the other features of the invention.

One object of my invention is to provide an automatic reverse for the longitudinal feed of the ribbon.

Another object is to produce ribbon mechanism that shall be simple and inexpensive to manufacture but thoroughly good in point of durability and satisfactory inoperation.

T o the above and other ends my invention consists in certain features of construction, and combinations and arrangements of parts, all of which will be fully set forth herein and particularly pointed out in the claims.

In the accompanying drawings I have shown enough of a front strike typewriter to illustrate the embodiment of my invention therein.

In said drawings, Figure 1 is a fore and aft vertical section of the machine. Fig. 2 is a top plan view of the rear part of the machine with the upper flange of one of the ribbon spools sectioned away. Fig. 3 is a front elevation of the machine in vertical section. Fig. 4 is a plan view of the ribbon feed mechanism as it would appear with the top plate sectioned away from above it. Fig. 5 is a top plan view of part of said feed mechanism and of the automatic reverse mechanism but taken in section a little lower than Fig. 4; that is to say, a certain reciprocatory plate and its Specification of Letters Patent.

Patented Feb. 9, 1915.

Serial No. 774,133.

guides shown in Fig. 4 are sectioned away in F ig. 5. Figs. 6 and 7 are views similar to Fig. but showing parts of the mechanism in dilierent positions. Fig. 8 is an isometric view of one of the spools with its upper flange sectioned away and showing also certain associated devices. Fig. 9 is a section through the top plate and the ribbon feeding and reversing mechanism about on the line of Fig. (3. Fig. 10 is a vertical section through the axis of one of the ribbon spools. Figs. 1--l are on a reduced scale and Figs. 5-9 are on an enlarged scale.

My invention is applicable or adaptable in whole or in part to various sorts of typewriters and other machines that print from an ink ribbon. The machine shown in the drawings has a main frame comprising a base part 1, corner posts 2, side bars 3, one on each side of the machine and connecting the front and back corner posts at their tops, a forward top plate 4 and a rear top plate 5. Each of the side bars 3 has a depressed part 6 forming a U-shaped opening for the carriage 7. Said carriage has a main body bar 8 grooved at its front and rear edges to constitute rails which, through the instrumentality of balls or rollers 10, are adapted to travel back and forth on stationary grooved rails 11 and 12. These latter are supported by the depressed part 6 of the side bars3 so that the rails, both stationary and traveling, are depressed below the level of the top plates 4 and 5. The carriage is fed across the machine by a spring drum 13 having a cord 14 wound thereon and running upward over a pulley 15 and connected at its free end to the underside of the rail 8. The step-lcy-step travel of said carriage is controlled by escapement mechanism not shown and which can be of any suitable sort. The rail 8 has end pieces secured thereto and designated specifically in the drawings by the reference numeral 7 and in which there is journaled the axle 16 of a roller platen 17.

Types 18 on the free ends of type bars 20 are adapted to strike against the front face of the platen 17. Said type bars arepivoted at 21 in a shiftable segment 22 mounted on arms 23 which are pivoted at 24170 posts 25 constituting, in a way, extensions of the side bars 3. The bars 23 are connected by a cross bar 26 in which are pivoted a series of sub-levers 27 which are connected by links 28 with the type bars 20. Said sub- .levers 27 are connected by vertical push links 30 with key levers 31 of the first order having printing keys 32 on their forward ends. Said key levers are pivoted on rods 33 mounted at their ends in a frame 34 secured in the base of the machine, and said key levers are provided with returning springs 35. The tv e action above briefly described, is not claimed herein but is claimed in another pending application of mine. As far as the present invention is concerned, said type action can be of any other suitable character.

A universal bar 36 lies above the key levers 31 back of their pivots 33, said universal bar being supported at its ends on two arms 37, which are secured to a rock shaft 38, which rock shaft is journaled in brackets 40 secured, as by screws 41, Fig. 1, to the base 1 of the main frame. At the middle of the machine a third arm 42 is provided, connected at its rear end with the shaft 38 and having the bar 36 also passing through said arm, and said arm 42 extends forward from the universal bar, as shown in Fig. 1, and it has a link 43 connected to its free end. The upper end of said link is pivoted to a lever 44 of the first order, which lever ispivoted at 45 to a bracket 46 extending toward the rear of the machine beneath the carriage and beneath the rail 11. The bracket 46 is a rearward extension of a block 47 which is secured by screws 48 to the front face of the stationary rail 11. Said block has two ears 50 into which are threaded two pivot screws 51, which pivot screws pass through suitable cars 52 of a ribbon vibrator 53 so that said vibrator is pivoted to said block on said screws 51. The lever 44 has its forwardly extending arm connected by means of a link 54 with an ear 55 bent off from the depending arm 56 of the vibrator 53. The lever 44 and the link 54 are so related as to constitute the elements of a toggle. such that when the universal bar 36 is moved upward-by the operation of one of the printing keys the rear arm of the lever 44 is moved upward by the link 43 and the forward arm of said lever is moved downward. The toggle 4454 is normally bent upward, as shown in Fig. 1, and it is straightened by the operation of a key. The construction is such that the operation of the vibrator takes place almost entirely in the first part of the key stroke, or at least in the first part of the movement of the universal bar 36, and that during the last part of the key stroke the vibrator is either entirely or substantiallv stationary on account The construction is toggle does not sensibly change the position of the vibrator. This fact is of advantage in a ribbon vibrator but it is of especial importance in the vpresentinstance for the reason that said vibrator is used not only as a vibratory ribbon carrierbut it also constitutes a guide for the type bars 20 and types'18. Said vibrator at its upper part is forked, as shown in Fig. 3, each of the branches 57 thereof having an inclined ribbon guiding slot 58 therein, and an opening 59 into said slot, and each of said branches is formed also with a forwardly projecting car 60, and said ears are beveled or inclined to constitute a center guide for the type bars. The opening between said ears is wide in front and tapers until it is just the width of the type block on the end of the type bar so that it steers the type bar to printing position with precision. As the type bars near the ends of the segment do not swing in the same plane as the vibratory ribbon and type guide, it is desirable that said guide remain substantially stationary until the type bar has got out of it, a condition that is brought about by the toggle mechanism described. It will be noted that the guiding cars 60 for the type bars are in front of the horizontal part of the ribbon 61 so that it is the sides of the type blocks themselves that are guided by the ears 60, and this is so whether the segment be in one of its three shifted positions or another.

The ribbon guiding means includes a plate 62 of sheet metal which is secured to the forward face of the rail 11. Said plate 62 is situated between the block 47 and the front face of said rail and is, therefore, held in position by the same screws 48 as said block.

The plate 62 at its upper part is bent off toward the rear of the machine, as shown in Fig. 1. At its middle said plate has riveted thereto a cross plate 63 made in the form of a T, the upright part of which is riveted to the plate 62, and the transverse arms of which are bent forward as shown in Fig. 1, the forward edge of said arms being foldedaback, as shown at 64. The ribbon 61 runs horizontally across from one of the inclined guides 58 to the other back of the arms 57, thence forward through said guides and downward underneath the transverse arms of the plates 63, and thence backward beneath the platen 17 and above the carriage bar 8 and the rails 11 and 12. It will thus be seen that the ribbon runs back through the carriage to the ribbon spools 65 and 66. These spools are arranged horizontally side by side, being mounted on spindles or stud shafts 67 projecting upward throu h the back top plate 5 in which said shafts are journaled. As shown in Fig. 10, each of these stud shafts has a flange 68 that rests on the top of a bushing 70 secured in a hole in the top plate 5. Below said bushing each of the shafts 67 has a reduced part 71 on which fits a toothed wheel 72 which is secured in position by a headed screw 73 threaded into the lower end of the shaft. The upper end of said shaft has a reduced part 74 forming a shoulder from which at one point a pin 75 projects upward to act as a spline or tooth to cause the spool to rotate with the shaft. Each of said spools comprises an upper and a lower flange, and, as will be seen, the hole through the'lower flange is larger than the hole through the upper flange so that said lower flange fits over the large part of the stud shaft 67 and the upper flange fits over the reduced part 71, being formed with a notch into which the pin 75 projects. It will be seen that this spool when in position on the machine is positively connected to turn with the shaft, but the spool can be instantly removed by simply lifting it off of said shaft. The two flanges are secured together by four posts 76 shouldered and riveted to the flanges and preferably a core 77 is loosely inserted just inside the posts and in such position that it will surround the stud shaft 67. This socalled core may consist simply of a strip of sheet or ribbon metal cut off to a suitable length and rolled into a cylindrical form. The function of said core is to prevent the ink ribbon, in case it bulges in between the posts 76, from getting into such position as to be caught on the stud shaft 67 when putting the spool on to the machine.

It will be perceived that the ribbon on the spools has its edges up and down, whereas when it passes under the guide 63 it is flat vertically and its edges are right and left so that each line of ribbon running forward from one of the spools must have a quarter twist in it. In order to make such a twist run true the horizontal guide for the ribbon should stand pretty exactly on a level with the m ddle of the coil of ribbon on the spool. To this end a wire guide 78 is provided, said guide consisting of a yoke-shaped piece of wire having two forwardly and upwardly extending arms, the rear ends of which are secured by screws or rivets to the top plate 5 and the upper surface of the cross wire lying as has been described, that is to say, in a plane parallel with the planes of the upper and lower flanges of the ribbon spools and midway between said planes. The ribbon is led forward from the spools over this wire 78, thence forward and downward beneath the guide 63, thence upward in front of the arms 57 of the vibrator, and thence horizontally between said arms at the back of the vibrator.

The ribbon feed mechanism is mostly mounted on the underside of the top plate 5. Said mechanism comprises a sliding plate 80, Figs. 4 and 9, which plate has its upper surface lying against the lower surface of the plate 5 and which is guided for a back and front sliding motion by means of guide plates 81 secured as by rivets 82 to the under side of said plate 5, said plates 81 having ears that lie beneath the plate 80. In Figs. 4, 5, 6 and 7 the parts are shown in top view with the plate 5 sectioned away and in the last three of these figures the plate is itself sectioned away, its outline only being indicated by broken lines. A double driving dog or rack 83 is pivoted to the forward end of the plate 80 by means of a post 84, which post is doubly shouldered as shown in Fig. 9, the lower reduced end of the post passing through the dog 83 to which it is secured by riveting. The middle section of the post passes with freedom to turn through the plate 80. Said post projects upward through a slot 85 in the front part of the plate 5 for reasons associated with the automatic reversing of the ribbon feed, as will more fully appear hereinafter. In order to hold the rear end of the dog 83 up against the plate 80, said dog is formed with an arc-shaped slot 86 through which a headed rivet 87 projects downward from the plate 80. The rear part of the dog 83 lies between the two toothed wheels 72 and it is formed with teeth constituting two short racks 88 and 89, the first for cooperation with the right-hand and the second for cooperation with the left-hand one of the wheels 72. The dog can be rocked about its pivot 84 to engage it with one or the other of these wheels and when it is in engagement with one of the wheels the front and back reciprocations of the plate 80 will cause that wheel to be rotated, leaving the other one free. In order to press the dog yieldingly against either one of the wheels 72, a centering dog or pawl 90 is pivoted at 91 to the underside of the plate 80 and said dog has a rounded part that is pressed toward the front of the machine by a spring 92 having one end inserted in a suitable hole in the dog 90 and the other end connected with a rivet 93 projecting from the plate 80. The rear end of the dog 83 is formed with a point 94, and the dog 90 engages on one side or the other of this point according to the shifted-position of the dog 83. In the drawings said dog 83 is shown in position for operating the right-hand ribbon spool 66.

The plate 80 is reciprocated back and forth by means of a long lever 95 pivoted at 96 to the under side of the plate 5 and near the right-hand side of the machine, as will be understood from Fig. 4; and said lever extends across the machine beneath the wheels 72 and the slide 80 and other parts that have just been described, the lever 95 terminating near the left-hand side of the machine where it is provided with a depending post or arm 97 to the lower end of which is connected a cord or chain 98 which, as shown inTFig. 1,'extends forward from the post 97 to a pulley 100 journaled on a screw 101 secured to the side bar 3. From said pulley the cord 98 extends downward where it is led over a small drum 102 constituting a sort of hub or sleeve of the spring drum 13 that drives the typewriter carriage. The hub or drum 102 and the spring drum 13 are journaled on an axle or shaft 103, Figs. 1 and 3, which at one end is pivoted in the "base part 1 of the typewriter and at its inner end is pivoted in an arm 104 projecting toward the rear of the machine from the frame 34. This shaft 103 is or may be connected with means, not shown, whereby it can be turned and held in adjusted position in order to regulate the tension of the spring in the drum. Said cord 98 can have its ends secured to the drum in any suitable manner. As here shown a sort of pawl or clutch device 105 is pivoted to the Side of the drum 13 at 106 in suchposition that if the cord 98 be drawn under this dog and the dog pressed toward the drum 102, the cord will be caught and wedged in between the end of the dog and the surface of the drum and thus held rigidly in position. The cord 98 is wound on the drum 102 in a direction the opposite of that in which the cord 14 is wound on the drum 13. The construction is such that when the carriage is moving toward the left the cord 98 is unwinding from the drum 102 and the left-hand end of the lever 95 is at liberty to move toward the rear of the machine and, as will presently appear, to carry with it the slide 80 and connected devices and thus to turn a ribbon spool.

The lever 95 is moved in the manner just described by means of a stiff spring 107 connected at one end to an arm 108 of the lever 95 and at the other end to a. post 109 dependingl from the plate 5.

he means by which the lever 95 pushes the slide 80 and connected parts toward the rear of the machine when the typewriter carriage is moving toward the left, consists of a post 110, Figs. 6 and 9, which is riveted into the slide 80 and depends therefrom.

Said post is cut away at its upper part to.

accommodate the dog 90 and spring 92 and it is formed with a shoulder 111, Fig. 9, against which the rear edge of the lever 95 is adapted to strike and it is also formed with a flange or car 112 that projects forward beneath said lever to prevent the latter from dropping downward. At the time when the parts are moving toward the rear the dog 83 is held in engagement with one of the wheels 7 2 by means of the dog 90.

The means whereby the lever 95 moves the slide 80 and its connected parts toward the front of the machine, consists of a pin 113 projecting downward from the dog 83 into an opening 114 in the lever 95. The rear part of this opening is formed with two V- shaped notches 115 and 116 leaving a sharp point between them so that when the lever moves toward the front of the machine, as indicated in Fig. 6, the inclination of one of these notches causes the pin 113 and the dog 83 to be moved toward the right or toward the left as the case may be to move said dog out of engagement with the wheel 72 before the slide 80 begins to move toward the front of the machine. In Fig. 5 the lever 95 is shown moving toward the rear and driving the right-hand wheel 72, and it will be seen that the pin 113 stands at the right of the center of the notch 116. When the lever starts toward the front of the machine there is a little lost motion between the post 110 and the pin 113, the taking up of which moves said pin to the left to the position shown in Fig. 6 so that the dog 83 moves toward the front of the machine entirely out of engagement with the wheel. lVhen the lever starts back toward the rear, however, the centering action of the notch 116 ceases and the dog 83 yields to the dog 90 and is moved back into engagement with the wheel, as shown in Fig. 5. As the two notches 116 and 115 are at the right and left-hand sides respectively of the center position of the pin 113 the dog 90 will always restore the dog 83 into engagement with the same wheel until the dog shall by some means have been moved past the center position into position for cooperation with the other wheel. This can obviously be done by hand and I have also provided automatic means for the purpose.

It will be perceived that the special ribhon-feeding spring 107 is put under tension by the return motion of the carriage, that said spring feeds the ribbon during the lettor-feed movements of the carriage, and that any excess of power in said spring over and above what is required to feed the ribbon, acts through the cord 98 and drum 102 to assist in propelling the carriage.

The ribbon reversing mechanism comprises two arms 117 and 118 projecting toward the left and right respectively from the post 84 above the level of the top plate 5 and in fact at such a level and in such position that the ribbon, in passing from the spools over the wire 78, is just above these arms. It will be noted that the said arms 117 and 118 are in a convenient position for manipulation by hand and they are also in position for operation by automatic means comprising two hooks 120, one at each end of the ribbon and, therefore, one associated with each of the ribbon spools. These hooks can be variously constructed and variously connected with the ribbon. As here shown said hooks are not connected primarily with the ink ribbon but each one is connected with a loop of tape 121, which loop passes around one of the posts 76 of the ribbon spool and the two ends of the tape are fastened together and to the hook by means of ears 122 bent back from the sheet metal from which the hook is made and compressed over the ends of the tape. Projecting beyond the ends of said tape said piece of sheet metal is formed into a pointed hook 123 over which the end of the ribbon 61 is adapted to be caught. It is by this means that the end of the ribbon is fastened to the spool and it will be seen that the hook 120 therefore remains connected permanently with the spool.

When the ribbon is exhausted from one of the spools the parts assume the position shown in Figs. 7 and 8 in which the lefthand hook 120 is run out until it. is caught under the arm 117. It will be seen that the hook catches the arm from the back so that said hook can act on the arm only when the slide 80 is moving toward the rear. At this time the dog 83 and connected parts stand either in the position shown in Fig; 6, which is the position they occupy at the beginning of a backward motion, or else in the position shown in Fig. 5. In either case, when by the backward motion of the slide 80 the arm 117 is brought into engagement with the hook 120, the pin 113 is not seated in the notch 116 where it would be hard to dislodge but is held in its right-hand position only by the action of the dog 90 under the control of the light spring 92. At this time a very light pull on the arm 117 is sufficient to throw the dog 83 and pin 113 to the lefthand side of the center and thus bring the dog 83 into action on the left-hand wheel 72. At the particular time when the reverse takes place the resistance to the rocking of the dog is so slight that no harm is done by the pull on the ribbon.

The teeth of the wheel 72 and of the racks 88 and 89 can be varied to a certain extent in form. As here shown they have the form of rather sharp ratchet teeth and as a matter of fact in the machine they are, if anything, somewhat sharper than shown in the drawings. The ratchet teeth of the wheels are set, however, in the reverse of the ordinary direction, that is to say, the faces of the teeth of the racks 88 and 89 cooperate, not with the abrupt faces of the teeth 72, but with the inclined faces of said teeth. This is in order to facilitate the reverse of the feed. It was found that with the abrupt faces of one set of teeth engaging the abupt faces of the other set of teeth that a considerable frictional resistance was offered to the pulling of the rack teeth out of engagement with the teeth of the wheel. By the arrangement shown this frictional resistance is entirely done away with. At the same time the inclined faces of said teeth are sufficiently steep so that the racks do not slip but turn the teeth with certainty. In the machine from which these drawings were made the inclined faces of said teeth are perhaps, as indicated above, somewhat more nearly radial than shown in the drawlngs.

In threading the machine the spools can be simply set on the shafts leaving a loop of ribbon between them. This loop is led forward over the Wire 73 and beneath the platen and the paper feeding devices asso ciated therewith and is drawn toward the front of the machine as a loop or fold. The right-hand branch of this loop is caught under the right-hand arm of the plate 63 and the left hand branch under the lefthand arm of said plate. The loop is then led upward and is slipped in through the openings in the inclined guides 58 into the position shown in the drawings. It will be perceived that the ribbon can very readily be removed from the machine by slipping it out of said guides 58 and out from under the cross guide 63 and lifting the spools off of their shafts. Another pair of spools with a fresh ribbon or with another ribbon of different sort of ink or a different color of ink can then be substituted. The spools can be thus removed and replaced without any change in the winding and so that when the same ribbon is put back into the machine the use of it can proceed from the point where it was left 03 last time, Or approximately so.

Various changes can be made in the details of construction and arrangement without departing from my invention.

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

1. In a typewriting machine, the combination of a carriage, a spring drum for operating said carriage, a smaller drum connected with said spring drum, a cord adapted to be wound onto and unwound from said smaller drum as the carriage moves back and forth, a reciprocatory part controlled by said cord, and a ribbon spool driven by said reciprocatory part.

2. In a typewriting machine, the combi nation of a carriage, a spring drum for operating said carriage, a smaller drum connected with said spring drum, a cord wound on said smaller drum, a lever operated in one direction by said cord, a spring for operating said lever in the other direction, and a ribbon spool operated by said lever.

3. In a typewriting machine, the combination of a carriage, a spring drum for operating said carriage in one direction, a smaller drum connected 'with said spring drum, a cord wound on said smaller drum in such a way that said cord is unwinding from said drum at the time when the carriage is being moved by said drum, and is wound on said drum by the return motion of the carriage, a spring put under tension by said cord when said cord is wound on the drum, and a ribbon spool driven by said spring. v

4. In a typewriting machine, the combination of a carriage, a spring for feeding said carriage in letter space direction, ribbon feed mechanism including a special spring for driving the ribbon feed, and means connecting said special spring to the carriage and whereby the return motion of the carriage puts said special spring under tension, the connection between said special spring and said carriage continuing during the letter feed movement of the carriage, whereby any excess of power in said special spring over and above-what is required for the driving of the ribbon,-tends to assist in the driving of the carriage in letter feed direction.

5. In a typewriting machine, the combination of a carriage, a spring for driving said carriage in letter feed direction, ribbon feed mechanism comprising a reciprocatory part so connected to the carriage that the return motion of the carriage operates said part in one direction, a spring connected with said part and put under tension by such motion of-said part due to the return of the carriage, and means operated by said part when said part is driven by said spring for feeding the ribbon,'the connection between said special spring and said carriage continuing during the letter teed movement of the carriage, whereby any excess of power in said spring over and above what is required to feed the ribbon, tends to assist in the letter feeding move ient of the carriage.

6. In a typewriting machine,the combination of a carriage, a spring drum for operating said carriage in one direction, a cord wound on said drum and connected with said carriage, a smaller drum connected with said spring drum, a cord wound on said smaller drum so as to act contrary to the first mentioned cord, a lever to which said second cord is connected, a spring acting on said lever and tending to move it in the direction opposite to that ofsaid cord, and a ribbon mechanism driven by said lever.

7. In a typewriting machine, the combination of two ribbon spools having toothed wheels disposed edge to edge, a dog lying between said wheels and having two racks to engage said wheels alternatively, a carriage, means for moving said dog in wheel-turning direction continually during the travel of the carriage from right to left in letter feed direction, and means operated by the return movement of the carriage for returning said dog idly in the other direction.

8. Inatypewriting machine, the combination of a carriage, two ribbon spools having toothed wheels disposed edge to edge, a rack-toothed dog adapted for engagement with said wheels alternatively,and means for reciprocating said dog in unison with the reclprocatlons of said typewriter carriage, the dog moving in spool-turning direction cont nually while the carriage is moving from right to left in letter feed direction and moving reversely when the carriage is bemg returned.

9. In a typewriting machine, the combination ot a typewriter carriage, two ribbon spools having toothed wheels, a rack-toothed dog adapted for engagement with said wheels alternatively, means for reci rocating sald do in unison with the reciprocat10n of said typewriter carriage, the dog movmg one way when the carriage is moving in letter feed direction and the other way when the carriage is being returned, and means for moving said dog into engagement with one of said wheels while the carriage is moving in letter feed direction and for holding said dog out of engagement while the carriage is being returned.

10. The combination of a pair of ribbon spools and their wheels, a dog shiftable to engage either one of said wheels, a recipro catory device for reciprocating said dog, means whereby said device when moving in one direction moves the dog out of engagement with whichever wheel it is operating, and means for moving said dog back into engagement with the same wheel when said device is moving in the other direction.

11. The combination of two ribbon spools and their wheels, a dog shiftably mounted between said wheels so as to engage either one of them, a reciprocatory device, and means connecting said reciprocatory device with said dog and comprising the pin 113 and the notches 115 and 116 coiioperating with said pin whereby upon the return stroke of said device said dog is moved out of engagement with one of said wheels by the co-action of said pin with one of said notches or from the other of said wheels by the co-action of said pin with the other of said notches as the case may be.

12. The combination of a pair of ribbon spools and their wheels, :1 dog shiftable into engagement with either wheel, a reciprocatory device, and lost motion connections between said device and said dog whereby said device operates said dog and one of the wheels when moving in one direction and moves said dog out of engagement when moving in the other direction.

13. The combination of two ribbon spools and their wheels, the slide 80, the dog 83 pivoted to said slide and the actuating device 95 having lost motion connection with the slide and dog, the lost motion being utilized to move the dog into and out of engagement.

14. The combination of a pair of ribbon spools having ratchet-toothed wheels connected therewith, a dog for engagement with either of said wheels, and means for shifting said dog from one Wheel to the other, said dog engaging the oblique faces of said ratchet teeth.

15. The combination of a pair of ribbon spools, ratchet-toothed wheels connected therewith, a dog having two ratchet-toothed racks for engagement with said wheels, and means for shifting said dog from one wheel to the other, the rack teeth engaging the oblique faces of the teeth of the wheels.

16. The combination of a pair of ribbon spools and wheels connected therewith, a reciprocatory slide, a dog pivoted to said slide and shiftable into engagement with either one of said wheels, means for yieldingly holding said dog in either of its two shifted positions, a reciprocatory device for operating said slide and dog, means whereby said evice moves said slide in one direction, and means whereby said device operates said dog and through it the slide in the other direction, the last recited means including means whereby said device moves said dog outof engagement.

17. The combination of a pair of ribbon spools mounted side by side on parallel axes,

means for turning said spools, and means for guiding the ribbon from one spool to the other, said guiding means including a bar parallel with the planesof the flanges of said spools and situated halfway between said planes whereby the ribbon is given a quarter twist between each spool and said bar.

18. Ina typewriting machine, the combination of a carriage comprisinga longitudinal frame bar, a platen mounted in said carriage, ribbon spools mounted behind said carriage, a ribbon vibrator in front of said carriage, and means for conducting said ribbon from said spools to said vibrator through said carriage.

19. In a typewriting machine, the combination of a main frame comprising depressed stationary carriage rails, a carriage traveling on said rails, a platen mounted in said carriage, ribbon spools behind said carriage, and means for guiding the ribbon from said spools between said rails and said platen and to the front of said platen.

20. In a typewriting machine, the combination of a main frame, a depressed stationary rail, a carriage traveling along said rail, a platen, a ribbon vibrator pivoted to said rail and having means for guiding an ink ribbon to the front of the platen, ribbon spools at the back of the carriage, and means for guiding the ribbon from said spools to said vibrator above said depressed rail and below the platen.

21. In a typewriting machine, the combination of a ribbon vibrator, and operating means therefor comprising a toggle which is straightened in the latter part of the operation of said means whereby said vibrator is substantially stationary in the latter part of the operation of said operating means.

22. In a typewriting machine, the combination of a ribbon vibrator, a series of type bars, a center guide for said type bars formed on said vibrator, and means for op erating said vibrator at each stroke of a type bar, said operating means including a toggle that is straightened in the latter part of said stroke whereby in the last part of the stroke of the type bar toward the platen and in the first part of its return stroke said vibrator and type guide are substantially stationary.

23. In a typewriting machine, the combination of a series of type bars, a vibratory guide for said type bars, and means for operating said guide at each stroke of the type bar, said operating means including a toggle that is straightened in the latter part of the operation of said operating means whereby said center type guide is substantially stationary at the time when it is engaged by a type bar.

24. In a typewriting machine, the combination with spool-turning mechanism including a stud shaft, of a ribbon spool capable of being placed on and removed from said shaft at will, said spool comprising two flanges, posts connecting said flanges and around which the ribbdn is wound, and an annulus or core loosely mounted inside of said posts and surrounding said shaft and serving to prevent the ribbon, where it bulges in between said posts, from catching on said shaft.

25. In a typewriting machine, the combination of ink ribbon mechanism comprising a ribbon spool, said spool having two flanges each with a hole through it and one of said holes larger than the other, spool-turning devices comprising a shaft on which said spool is detachably mounted, said shaft having a relatively large part for cooperation with the larger one of said holes and a relatively small part at its end for cooperation with the smaller of said holes, and means to cause said spool to turn with said shaft when mounted on it, said means, however, allowing the spool to be lifted freely off of the shaft.

26. In a typewriting machine, the combination of a pair of ribbon spools mounted side by side, a lever arranged to vibrate in a plane parallel with the faces of said spools and said lever extending transversely of the lever to vibrate in unison with the bac forth motion of said carriage, and means whereby said lever drives said spools.

Signed at the borough of Manhattan city of New York, in the county of New Y and State ofNew York, this 16th day of means for causin said June, A. DJ. 1913.

ARTHUR W. SMITH.

and

Witnesses CHARLES E. SMITH,

ork, ETHEL M. VVELLs.

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