US1488124A - Typewriting machine - Google Patents

Description

March 25 1924.

1 s. KHALIL TYPBWRITING momma Filed Jan. 24, 1922 2 Sheets-Sheet 1 March 25, 1924. 1,488,124

r S. .KHALIL o TYPEWRITING MACHINE Filed Jan. 24. 1922 2 Sheets-Sheet 2 mi /anion W m y Affo ey Patented Mar. 25, 1924,

UNHTEELE ST --,,TE,S

PATENT @FHCE,

SEYED KHALIL, 03F NE'WARK, NEW! JERSEY, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEVT YORK, N. Y.,

A CORPORATION OF DELAWARE.

TYPENBITING MACHINE.

Application filed January 24:, 1922.

T 0 all whom it may concern:

Be it known that l, Snvnn TTHALUJ, a subject of the Shah of Persia, residing in Newark, in the county of Essex and State of New Jersey, but formerly of Paris, France, and also formerly of Teheran, Persia, have invented certain new and useful Improvements in Typewriting Machines, of which the following: is a specification.

This invention relates to typewriting machines, and more particularly to variablefeed escapement mechanism therefor.

The main object of the invention is to provide improved means whereby the stepby-step feed movements of the typewritercarriage may be varied.

Another object of the invention is to provide means whereby th variable-feed escapement mechanism may be selectively controlled by the typewriter keys.

Heretot'ore, the feeding movements of the escapement mechanism, in a machine in whichthe escapement wheel is controlled by means of a fixed and a loose dog, have been varied by varying the movement of the loose (log and thereby determining the extent of the movement of the escapement wheel when th escapement is actuated.

According to the present invention, there is no variation in the movements oi. the escapement wheel, the variation in the move ments of the carriage being eifected by means in the nature of gear-shift mechanism.

In the present embodiment of the invention, the escapement wheel is provided with crown-teeth, certain of which, one for each tooth at the periphery of the escapement wheel, extend from the periphery to points near the center of the wheel. A. second set of short crown-teeth are arranged in a circle in the middle of the intervals between the teeth of the first set and substantially midway between their ends, and another set of short crown-teeth are arranged in a circle near the periphery of the escapement wheel, th teeth of this set being arranged at regular intervals in: each interval between adjacent teeth of the first-mentioned set. When the escapement wheel is at rest, one of the long crown-teeth meshes with a pinion splined on a shaft extending across the face Serial No. 531,350.

of the escapement wheel, the connection between the pinion and the escapement wheel being such that the pinion may be moved from its normal position in mesh with the long teeth near the center of the escapement wheel to a position to mesh with the second set of crownteeth, and also into position to mesh with the teeth oi: the third set.

A gear on the shaft carrying the pinion meshes with a rack on the carriage, and it will be vident that, for a single-step movement of the escapement wheel, the carriage will be moved one, two or three spaces, in accordance, respectively, with the position of the pinion near the center of the escape ment wheel, the position to mesh with the second set of crown-teeth, and the position to mesh with the third set.

The pinion may be controlled by a substantially horizontal arm of a lever pivoted at one side of the frame, and having a pin ft-Ilf groove connection with the hub of the pinion. The horizontal controlling arm is prevented by a suitable stop from upward movement, and is held in this limiting position by a suitable means, such as a spring. When the horizontal arm is in its normal position, movement of the escapement wheel will cause a one-step movement of the carriage. To vary the movement or" the carriage, however, links are connected with the lever at such distances from the pivot that, in connection with the downward movements of said links, the pinion will be moved into mesh with the second and third sets of crown-teeth, respectively.

The feeding of the escapement wheel is controlled by the keys, and the pinion meshing with the teeth on the face of the escapement wheel may be selectively positioned by the keys in order to effect the variable movement of the carriage. Provision is, therefore, made of three devices, each universal to a set of'keys. Each of these universal devices is connected by suitable means with an arm carrying the usual fixed and loose dogs, so that, upon actuation of any one of the keys, the escapement wheel will be fed one step. Since the pinion is normally positioned with reference to the escapement wheel so that a one-step movement of the carriage will be efl'ected. for each step of the escapement wheel, it is unnecessary to have any connection between the device, universal to the keys which are to produce a onestep movement, and the bar controlling the pinion. Connections are, however, provided between the other universal devices and the two links connected with the controlling bar, so that, when a key of one of the corresponding sets is depressed, the pinion will be shifted to mesh with the second set of crown-teeth, and, when a key of a third set is depressed, the pinion will be shifted to a position to mesh with the crown-teeth of the third set. It will be seen that, upon dcpres sion of a key of one set, the pinion will remain in the same position on its shaft and the escapement wheel will be actuated in the usual manner. Upon depression of a key of the second set, the pinion will be shifted 30 to give a two-step movement of the carriage, and, after this shift has been effected, the escapement wheel will be advanced one step. Upon depression of a key of the third set, the pinion will be shifted to a position to mesh with the crown-teeth of the'third set,

and thenthe escapement wheel will be actuated.

Gther features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a diagrammatic side elevation, partly in section, showing an Underwood standard typewriter with the invention applied thereto.

35 Figure 2 is front elevation of the escapement wheel.

Figure 3 is a front view of the pinion cooperating with the crownteeth on the escapement wheel, the hub of the pinion bean ing broken away.

Figure 4 is a detail sectional view showing the mounting of the escapement wheel and the pinion which co-operates with the crown-teeth thereon.

15 Figure 5 is a sectional front elevation of the machine, showing more particularly the parts embodying the present invention.

Depression of a type-key 11 will swing a corresponding key-lever12 about its pivot. 13 against the action of spring 14, and this motion will be transmitted by means of a bell-crank 15 to a type-bar 16 to swing the latter upwardly and rcarwardly to type on a platen 17. The platen 17 is jonrnaled in as a platen-frame 18 mounted in a transversely movable carriage 19.

The carriage 19 is slidably supported at its rear on a rail 20 and is drawn to the left by means of a strap 21 connected therewith no at one end and at the other to a spring-drum 22. To control the movement of the carriage 19 under the act-ion of the spring-drum 22, provision is madeof a rack23 carried by arms 24 pivoted on the carriage, and at, mes i with e .pinieafi red on a sh 26, the upper end of which projects into a socket in a bracket 27 projecting forwardly from the rail 20, and the lower end of which extends into a socket in a bracket 28 supported in the machine frame 29.

Held against movement around the shaft 26 by means of a spline 30 is a pinion 31 provided with a sleeve 32 of sufficient length to give a suitable bearing on the shaft 26. The spline 30 extends into grooves in the shaft 26 and sleeve 32, and, while holding the pinion 31 against rotative movement with respect to the shaft 26, permits the pinion to be shifted longitudinally thereof.

Certain teeth 33 of the pinion 31 normally engage a crown-tooth 34 on the face of an escapen'ient' wheel. 35held by means of a shouldered screw 36 in operative engagement with a bracket 37 projecting forwardly from a cross-bar 38 in the rear of the machine frame. The tooth 34 is one of a set of long crown teeth extending from the periphery of the escapement wheel 35 to points near the center and angularly arranged in accordance with the position of escapement teeth 39 projecting from the periphery of the escapement wheel 35. The escapement wheel 35 is provided with a second set of crown-teeth 40 of which the teeth are short and placed in a circle midway between the teeth 34 of the first-mentioned set and substantially midway between the ends of said teeth 34. The escapement wheel 35 is also provided with a set of short crown-teeth 41 arranged in a circle near the periphery of the escapement wheel and arranged with two teeth in each interval between the outer ends of the teeth 34. The teeth 33 of the pinion 31 are tapered on both sides so as to enable them to mesh properly with the inner ends of the long teeth 34 and to enable the teeth 33 to be shifted readily into positions to mesh with the teeth 40 and also the teeth 41, Due to the engagement of the teeth of the pinion 31 with teeth on the face of the escapement wheel 35, there will be, at certain times, considerable force exerted, which will tend to force the escapement wheel 35 out of its proper position. To pre-- vent such displacement, the escapement wheel 35 may be provided with a cylindrical hub 35 which fits closely in a suitable recess in the bracket 37.

The pinion 31, when meshing with the teeth 40, is twice as far from the axis of the wheel 35 as when meshing with the inner ends of the teeth 34, and, when meshing with the teeth 41, is three times the distance from the center as when meshing with the inner ends of the teeth 34. It will be evident that a one-step movement of the escapement wheel 35, when the pinion 31 meshes with the inner ends of the teeth 34, will permit asingle letter=space movement of he. carriag 5-. that, when the p nion; 31

meshes with the teeth 40, the step movement of the escapement wheel will permit a double letter'space movement of the carriage; and that, when the pinion 31 meshes with the teeth 41, a single-step movement of the escapement wheel will permit a triple letterspace movement of the carriage.

As herein disclosed, the feeding movement of the carriage caused'by depression of one of the keys 11 is a one-step, two-step, or three-step movement according to the particular key depressed, and the control of the escapement mechanism for this purpose is effected by means of nested bails 42, 43, 44, pivoted on a shaft and having their straight portions or bars 46, 47 and 48 eX- tending transversely under projections 49 on the lower edges of the key-levers 12, each of these projections having a straight lower edge 50 which, when the key-lever is in normal position, is substantially horizontal. In order that only one bail may be actuated by a single key-lever 12, the straight portions of the two bails, which are not to be operated, are provided with notches 51 under that key-lever.

The bars 46, 47 and 48 are provided with upwardly-extending links 52, 53 and 54 which project loosely through a plate 55 mounted on arms 56 and 57 secured to a shaft 58 which is j ournaled at one end in the bracket 28 and at the other end in abracket 59. Upon depression of one of the keys 11 therefore, one of the bails 42, 43 and 44 will be actuated and the corresponding link will be drawn downwardly to bring one of the collars 60, 61 or 62, fixed on their respective links, into engagement with the plate 55, thereby depressing the latter and swinging the arms 56, 57 in a counter-clockwise direction (Figure l) This movement of the arm 56 is transmitted through a link 63 to a horizontal arm 64 fixed on a shaft 65 on which is fixed an upright arm 66 carrying a loose dog 67 and a fixed dog 68 by which the movement of the escapement wheel 35 is controlled. It should be understood that the positions of the collars on the links may be varied to compensate for the difl'erent distances of the bars from the pivots 13.

Preferably the shaft 65 is supported by means of screws 65 having tapered ends projecting into recesses in the ends of the shaft, the screws 65 being threaded into uprights 69 on the bracket 28.

\Vhen the upright arm 66 is swung forwardly in this manner, the loose dog 67 is withdrawn from engagement with a tooth of the escapement wheel 35 and the fast or fixed dog 68 moved into engagement therewith, the loose dog, which is mounted, as shown in Figure 5, then being swung about its pivot 70 by means of a spring 71 connected to its lower end and also to a 111 72 projecting laterally from the arm 66. he

movement of the arm 66 is resisted by a spring 66 which serves normally to hold the arm 66 and the plate 55 in their normal positions. Upon the return of the arm 66 to its normal position, the loose dog will then enter the space between the tooth with which it was formerly engaged and the next tooth to the left, thus permitting the escapement wheel to be advanced one step.

Usually there is a one-way driving connection between the escapement wheel of a typewriting machine and the typewriter carriage to enable the carriage to be returned easily, but in the present case no such provision exists, and the loose dog 67 is so controlled as to permit the escapement wheel 35 to be rotated by the carriage in its return movement. The construction is such that, when the loose dog 67 is released from the eseapement wheel, it will be shifted by the spring 71 to aposition in which its lower arm is in alignment with the spring which will cause the loose dog 67 to be moved into the path of the'next tooth 39, when the type-key is restored to normal position, and at the same time will enable the loose dog, upon a reverse movement of the escapement wheel, to be swung to one side by each of the teeth 39.

The pinion 31 is normally held in a position to mesh with the inner ends of a tooth 34 immediately below the center of the escapement wheel, by means of a lever 73 mounted on a pivot 74 on the right side of the machine frame. Connection between the lever 73 and the pinion 31 is effected by means of a pin 75 projecting from the left end of the lever into a circumferential groove 76 in the sleeve 32. The lever 73 is prevented from upward movement by the engagement of its right-hand end 77 with a fixed part of the frame of the machine, the lever being held in this position by means of a spring 7 8 having its lower end connected with the lever and its upper end connected with an overhanging arm 79 fastened to the frame of the machine.

The bails 42, 43 and 44 are used to control not only the movement of the escapement wheel 35, but also to selectively position the pinion 31. The bar 46 of the bail 42 is utilized when a one-step movement of the carriage is to be effected, the bar 48 when a two-step movement of the carriage is to be effected, and the bar 47 when a three-step movement of the carriage is to be effected. Inasmuch as the pinion 31 is normally pcsitioned for a one-step movement of the carriage, no shifting of the pinion is necessary when the bar 46 is depressed by any of the key-levers 12 by which it is designed to be operated. in order to shift the pinion when the bars 47 and 43 are to be actuated, use is made of the links 53 and 54, which are connected to the lever 73 at their upper ends by pins 80 and 81 projecting from the lever 73 into slots 82 and 83 in the respective links 54 and 53.

It will be seen that the pin 80 is substantially twice as far from the pivot 74 as the pin 81, so that the extent of the actuation of the lever 73 by the link 54 would be only about half that produced by actuation of link to substantial y the same extent. It will be seen also that the pin-and-slot connections between the links 54 and 53 and the lever 7 3 enable independent actuation of the lever by said links. Preferably, the slot in each of the links 54 and 53 is made of sutlicient length only to permit actuation of the lever 7 3 by the other link without interference, and, inasmuch as the link turns the lever 73 through twice as great an angular distance as the link 54, the slot 82 is made of substantially double the length of the slot 83.

It will be evident that, for spacing purposes, the type-keys 11 are divided into three groups. Upon the operation of a type-key of the group for which one-step movement of the carriage is to be eifected, the bar 46 will be depressed, and, as the key approaches the lowerend of its movement, the collar 60 will engage the plate 55 and actuate the fast and loose dogs to withdraw the loose dog 67 from the escapement wheel and move the fixed or fast dog 68 into engagement with the escapement teeth 39 just disengaged by the loose dog 67, and, upon return of the type-key to its normal position, the loose dog will be moved back into engagement with the escapement wheel, but will engage the next tooth 39 to that previously engaged and the carriage will be permitted to advance one step. Inasmuch as the link 52 has no connection with the lever 7 3, the pinion 31 will not be shifted from its normal position shown in Figure 5.

Upon depression of a key for which a two-step movement of the carriage is necessary, the bar or universal member 48 will be depressed by the corresponding keylever, and the link 54 will be drawn downwardly to swing the lever 73 sufficiently to cause the pinion 31 to mesh with the teeth 40. It will be seen that the movement of the lever 73 begins in'imediately upon the beginning of the movement of the bar 48. After the movement of the lever has been substantially completed, the collar 61 on link 54 will engage the plate 55 and actuate the fast-and-loose dog mechanism to advance the escapement wheel 35 one step. Since, however, the pinion 31 has been shifted into position to mesh with the short teeth 40, a single-step movement of the escapement wheel 35 will produce a movement of the carriage which is double that produced by depression of a key which actuates the link 52.

In the same manner, upon depressing a key to type a character which requires a three-step movement of the carriage, the universal bar 47 will be depressed to pull on the 11111 53 to lower the lever 73 into a position such that the pinion 31 will mesh with the teeth 41, and, just prior to the completion of this movement, the collar 62 will engage the plate 55, and, by means of the fast-and-loosc dogs 63 and 67, respectively, will cause the escapement wheel to be fed one step which, as the connection between the escapement wheel 35 and pinion 31 has been suitably varied, will produce a three-step movement of the carriage.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting. machine, in combination, a carriage, escapement mechanism therefor comprising an escapement wheel having a regular, step-by-step movement, and a gear-shift connection between the escapement wheel and the carriage to enable the movement of the carriage relative to the escapement wheel to be varied, character keys, and means actuable by. said keys for selectively controlling the gear-shift connection in accordance with the keys 'depressed. g

2. In a typewriting machine, in combina tion, a carriage, character keys, escapement mechanism comprising anescapement wheel, and an upright pivoted arm having a fixed dog and a loose dog at the upper end thereof, the latter being normally in engagement with a tooth of the escapement wheel, an arm projecting substantially horizontally from the pivot ofsaid arm and connected with the latter so as to move therewith, a member connected with said horizontal arm to actuate the same, and separate connections between said member and different groups of the keys to actuate said member to a uniform extent, and meanscontrolled by said separate connections for varying the action of the escapement mechanism.

3. In a typewriting machine, in combination, a carriage, an escapement mechanism for controlling the movement thereof, comprising a rotatable disk having on one face long crown-teeth extending from its periphery to points near its center and arranged at regular intervals and a set'of short crown teeth arranged in a circle in the intervals between the long crown-teeth and inter mediate the ends thereof, and means for controlling said disk so as to give a step-bystep movement thereof corresponding to the angle between successive teeth of the long set, a pinion movable across the face of the disk and normally in mesh with one of the long teeth near the inner end thereof, a connection between said pinion and said carriage, and means to move said pinion from its normal position to a position to mesh with the set of short teeth, so that upon a one-step movement of the disk the carriage will be given a movement double the normal movement.

4. In a typewriting machine, in combination, a carriage, and an escapement mechanism for controlling the movement thereof, comprising an escapement wheel, means for controlling the escapement wheel so as to give a uniform step-by-step movement thereof, and a variable driving connection between the escapement wheel and the carriage comprising two rotatable members having a driving connection between the periphery of one and a face of the other for varying the step movement of the carriage by varying the position of the periphery of the first member radially on the face of the other.

5. In a typewriting machine, in combination, a carriage normally urged in one direction, and step-by-step escapement mechanism for controlling its movement, comprising a wheel having a set of comparatively long crown-teeth extending radially with reference to the wheel and separate circular sets of short crown-teeth arranged in the intervals between the long teeth, the number of teeth in the sets of short teeth varying with their distances from the center of the wheel, a pinion co-operating with the wheel and normally connected therewith by one of the long crown-teeth when the parts are in normal position, and shifting means whereby the pinion may be positioned to mesh with the long teeth near the center of the wheel, or at such distances from the center of the wheel to enable it to mesh with the short teeth of different sets, thereby changing the gear ratio between the wheel and the pinion in proportion to the distance of the pinion from the center of the wheel.

6. In a typewriting machine, in combination, a carriage normally urged in one direction, and step-by-step escapement mecha nism for controlling its movement, comprising a wheel having a set of comparatively long crown-teeth extending radially with reference to the wheel and separate circular sets of short crown-teeth arranged in the intervals between the long teeth, the number of teeth in the sets of short teeth varying with their distances from the center of the wheel, a pinion co-operating with the wheel and normally connected therewith by one of the long crown-teeth when the parts are in normal position, shifting means whereby the pinion may be positioned to mesh with the long teeth near the center of the wheel or at suitable distances from the center of the wheel to enable it to mesh with the short teeth of different sets, thereby changing the gear ratio between the wheel and the pinion in proportion to the distance of'the pinion from the-center of the wheel, and means for controlling the step-bystep movement of said wheel and consequently of said pinion.

7. In a typewriting machine, in combination, a carriage normally urged in one direction, and step-by-step escapement mechanism for controlling its movement, comprising a wheel having a set of comparatively long crown-teeth extending radially with reference to the wheel and separate sets of short crown-teeth arranged in the intervals between the long teeth, the number of teeth in the sets of short teeth varying with their distances from the center of the wheel, a pinion co-operating with the wheel and nor mally connected therewith by one of the long crown-teeth when the parts are in normal position, shifting means whereby the pinion may be positioned to mesh with the long teeth near the center of the wheel or at distances from the center of the wheel to enable it to mesh with the short teeth of different sets, thereby changing the gear ratio between the wheel and the pinion in proportion to the distance of the pinion from the center of the wheel, and means ineluding a fast dog and a loose dog for controlling the step-by-step movement of said wheel, the loose dog being so mounted as to permit backward movement of the carriage.

8. In a typewriting machine, in combination, a carriage, and escapement mechanism therefor, comprising a rotatable element including a wheel having peripheral escapement teeth to determine different positions thereof, and at one side a crown-gear comprising long radial teeth, one of which is vertical when the rotatable element is at rest, and additional short. teeth arranged in a circle and uniformly spaced between the long teeth, so as to co-operate therewith to provide teeth at regular intervals, a vertical shaft adjacent said crown-gear and operatively connected with said carriage, and apinion slidable on said shaft but connected thereto so as to rotate therewith, said pinion co-operating with said crown-gear and being shiftable along the long teeth of said crown-gear, so as to vary the gear ratio between the crown-gear and the pinion.

9. In a typewriting machine, in combination, a carriage, type-keys, and variable escapement mechanism for the carriage, comprising a wheel having a set of comparatively long crown-teeth extending radially with reference to the wheel and separate circular sets of short crown-teeth arranged in the intervals between the long teeth, the number of teeth in the sets of short teeth varying with their distances from the center of the wheel, a pinion co-operating with the wheel and normally connected therewith by one of the long crown-teeth when the parts are in normal position, and shifting means, selectively controlled by said typekeys, whereby the pinion may be positioned to mesh with the long teeth near the center of the wheel or at distances from the cen ter of the wheel to enable it to mesh with the short teeth of different sets, thereby changing the gear ratio between the wheel and the pinion in proportion to the distance of the pinion from the center of the wheel.

10. In a typewriting machine, in combination, a carriage, type-key levers, an escapement mechanism including an escapement wheel, fast and loose dogs to co-operate therewith, and an operative connection between said escapement wheel and said carriage, a plurality of universal members extending transversely beneath the key-levers and beingso shaped that only one of said members will be actuated by a single keylever, an actuating device for said fast and loose dogs, a connection between each of said universal members and said device, and means whereby all but one of said universal members may vary the operative connection between said escapement wheel and said carriage and thereby vary the feed movements of the carriage.

11. In a typewriting machine, in combination, a carriage, type-keys, an escapement mechanism for said carriage including an escapement wheel, a fast-andloose dog-device for controlling the same,'and an operative connection between said escapement wheel and said carriage, a plurality of members to which said device is universal for actuation thereby, each of said members being universal to the keys of one of a plurality of sets, and a device actuable by the keys of all but one of said sets for selectively varying the connection between the escapement wheel and the carriage to vary the movement of the latter in accordance with the sets to which the depressed keys belong.

12'. In a typewritingmachine, in combination, a carriage, type-keys, an escapement mechanism for controlling the movement of the carriage, comprising an escapement wheel controlled for step movements of uniform length, and a variable connection between the escapement wheel and the carriage, comprising two rotable members having a driving connection between the periphery of one and a face of the other whereby the step movements of the carriage may be varied by varying the position of the periphery of the first member radially on the face of the other, and means to vary the position of the first member, comprising a horizontal lever, two depending links, the point of attachment of one of these links being substantially twice as far from the fulcrum of the lever as the point of attachment of the other, and two elements, each univer- "sal to the keys of one of a plurality of sets,

of that effected by the link nearest the ful-' crum.

14. In a typewriting machine, in combination, a carriage, type-keys, escapement mechanism for the carriage including an escapement wheel, a connection between the escapement wheel and the carriage, and means to control the escapement wheel comprising a plate normally in horizontal position, a plurality of members each universal to a plurality of said keys, links extending upwardly from said members through openings in said plate and having collars thereon, so that, upon actuation of one of said keys, the collar connected with the corresponding universal member will actuate the plate to feed the escapement wheel just before the depressed key reaches its lowest position, and means controlled by all but one of said links for controlling the connection between the escapement wheel and the carriage to vary the step movements of the latter.

15. An escapement wheel for a typewriter,

having escapement teeth at regular intervals around the periphery thereof, one edge of each tooth being substantially radial with reference to the wheel, said wheel having on one face long crown-teeth extending radially from its periphery adjacent the radial edges of said escapement teeth to points near thecenter of the wheel, and a set of short crown-teeth arranged in a circle in the intervals between the long crown-teeth and intermediate the ends thereof.

16. An escapement wheel for a typewriter having escapement teeth at regular intervals around the periphery thereof, one edge of each tooth being substantially radial with reference to the wheel, said wheel having on one face long crown-teeth extending radially from, its periphery adjacent the radial edges of said escapement teeth to points near the center of the wheel, and a plurality of sets of short crown-teeth arranged in circles in the intervals between the long crownteeth and intermediate the ends thereof.

17. In a typewriting machine, in combination, a carriage, a feed-rack on said carriage, a vertical shaft having a pinion in mesh with the feed-rack, an escapement-wheel adjacent said vertical shaft, said escapementmovement of the carriage may be varied,

and a bracket to support said escapement- Wheel, provided With a recess to receive the hub on the rear of the escapement-Wheel to hold the escapement-Whcel firmly against the pressure on the forward :tace thereof.

18. In a typeWriting machine, a carriage, character keys, key-levers for said keys, an escapement-mechanism for controlling the movement of the carriage, means for operating the escapement1necl1anis1n, comprising a substantially horizontal member pivoted at its rear, links extending through suitable openings in said pivoted member and connected at their lower ends With bails selectively operable by the character" keys, collars on said links above said pivoted memher, so that depression of the character keys will rock the pivoted member and actuate the escape1nentmechanism, and means connected to two of said links to vary the extent of feed-movements of the carriage resulting from operation of the character keys.

19. In a typewriting machine, an escapement-wheel having teeth on the periphery thereof, different sets of crown-teeth on one face thereof, and a hub projecting at the back thereof, a supporting bracket for said escapement-Wheel havin a recess into which said hub fits, and a shouldered screw passing through said hub and threaded into said bracket.

SEYED KHALIL.

Witnesses:

CATHERINE A. NEWELL, EDITH B. LIBBEY.

Images