US1011719A - Type-writing machine. - Google Patents

Description

G. J. BARRETT.

TYPE WRITING MACHINE., A9PLIOAT10N FILED 11113.11, 1911,

1,01 1,719. Patented 1111111251911.

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'I-IJE ATTRNEY G. J. BARRETT.

TYPE WRITING MACHINE.

APPLICATION FILED 111111.11, 1911.

Patented Dec. 12,1911.

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G. J. BARRETT.

TYPE WRITING MACHINE.

APPLICATION FILED MAB. 1I. 1911.

1,01 1,? 19. 'Patented 11110.12, 1911.

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GLENN J. BARRETT, OF GRANI) RAPIDS, MICHIGAN, ASSIGNOR T0 UNION TYPEWILITEB. COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Application filed March 11, 1911. Serial No. 613,778.

My invention relates to typewriting machines and more particularly to carriage escapement mechanism.

Grdinarily in'that class of escapements in which the Let-oft of the carriage is effected at the upstroke of the key, and which escapements are known as ordinary escapements as distinguished from reverse escapements, the extent that the dogs pass through the escapement rack or wheel is proportional to the extent .the key is depressed, and there is often an undue lost travel of the dogs through the wheel and it is necessary to take up this lost travel of the dogs on the return stroke of the key before thecarriage can be let'otf which results in an irregular acting and comparatively slow escapement.

The main object of my invention, generally stated, is to overcome the disadvantages embodied in escapements such as those referred to above and t0 provide a rapid, reliable, positively acting and eiiicient escapement which is 'substantially uniform in its action under diiferent conditions of key stroke and in 'which the key controlled escapement member receives a complete movement in one direction at the first. part of the down stroke of 'the key and receives a complete return movement at the first part of the return stroke of the key so that a letotf, of the carriage is effected almost instantly upon the release of a depressed keyeven though there oe a variation in the extent of dip of the keys. v

To the above and other ends which will hereinafter appear, my invention. consists in -the features of construction, arrangements of parts and combinations of devices set forth 1n the following specification and .particularlyV pointed out in the appended claims. p

In the accompanying drawings wherein like reference characters indicate corresponding partsin the various views, Figure 1 is a vertical, central, front to rear sectional View,` of one form of typewriting machine embodying my invention; only4 a sufiicient number of parts of a typewriting machine being shown to illustrate my invention in its embodiment therein. menta ry, detail rear elevation showing parts of the escapement mechanism; portions of the mechanism being broken. away and parts rammed nee. ia, rari.-

Fig. 2. is a frag-yy being shown in section. Figs. 3, fl and 5 are Y detail side elevations showing portions of the escapement mechanism; these last mentioned figures illustrating4 the parts disposed as they appear at di erent portions of a key stroke.

I have shown my invention embodied in the present instance in a machine resembling the No. 10 Remington machine, although some of the parts are only conventionally represented. It should be understood, however, that so far as my prese-nt invention is concerned, it is immaterial in what style of typewriting machine the invention is 'enr bodied or what character of type actions are employed. It is also immaterial for the purpose of the present invention what characier of feed dogs and rack are used, although the invention is directed more particularly to ordinary escapemenrs 1n which the let-oft 9 of the carriage is elfected at the upstroke of the key.

The frame ofthe machine comprises a base 1, corner posts 2 and a top plate 3. A carriage 4t is mounted on anti-friction balls or rollers 5 to travel from side to side of the machine over the top plate under power transmitted to the carriage from the usual spring drum G, which is connected to the carriage in the ordinary manner. The carriage carries a cylindrical platen 7 against the front face of which upwardly and rearwardly striking type bars S are adapted to strike, -the 4type bars being segmentally arranged on a'type bar segment 9. Actuating links 10 and lland an intermediate sub-lever 1Q are interposed between eachkey lever 13 and the associated type bar. Thel key levers are provided' with linger keys 14, and are returned to normal position by `contractile springs 15.

Rearwardly extending arms 16 are pivbeing parallel ment Wheel or rack 22 provided with teeth 23 beveled at 24 on the rear faces thereof for purposes which will hereinafter more clearly appear. A dog rocker or carrier 25 hasits shaft 2G mounted on pivot screws 26a received in openings in one set of arms of a1 bracket plate 27 secured to the frame of the machine. The upright arm of the dog rocker is formed with a fixed holding dog 28 provided with a itat working face. A stepping dog 29 is pivoted on a shouldered pivot screw 30 to the upright arm of the dog rocker, the axis of the pivot 30 withk the pivotal axis 26 of the dog rocker. The dog 29 is thus maintained `fixed with reference to the travel of the escapement Wheel but is adapted to turn on its `pivot 30 at right angles to the plane of the escapement Wheel. The dog 29 is normally maintained in the position shown .in Fig. l by a contractile l spring 3l connected at one end `to the dog vspection of Fig. 2 it will .facesof the two dogs l' Pll'llel planes.

rocker and at its opposite end to the pivoted dog 29, and the motlon of said dog 29 under the impulse of said spring is limited by a shoulder of the dog., rocker. From an inbe understood that betweenthedaivoted dog 28, the working belng maintained in The dog rocker 25 issprovided with a forwardly extending substantially horizontally disposed arm 32 slotted there is aV slight drop dog 29 and the fixed -at 33 for purposes which will hereinafter more clearly. appear. An actuating member 34 is operatively connected to the arm 32 of the dog rocker to actuate said dog rocker at each operation of the key. The actuating member 34 in the present instance is in the nature of an angular floating lever7 the upper end of the uprightarm of which is formed as a yoke or loop 35 adapted to straddle the arm 32 of the dog rocker and to form a support for a pivot 36 on which an anti-frictionv roller 37-38 is mounted.

The portion 38 of the anti-friction roller 1s received Within the slot 33 in the dog rocker, Whereas the portion 37 of the roller is adapted to coperate with either one of the two faces 39 and 40 of a spring actuated latch or detent 4l, pivoted at 42 to the dog rocker. Cushion stops 43 and 44 of felt, leather or like material are secured to' one side of the rocker arm 32 by screws 45, one of said stops being provided near each end of the slot 33. The stops are'so positioned that the portion 37 of the antifri'ction roller 374-38 is brought into con.-

tact with either of said stops'just before Y.

4ber 34 on the dog .a loatinglever, is pivoted provided with a laterally projecting pin 4G to which one end of a contractile spring 47 is connected; the opposite end of said spring being connected to a laterally projecting pin 4S on the dog. rocker. The pull of this spring is exerted on the detent 4l to-main tain either of the contact faces 39 or 40 in engagement with the roller 37`38 as the roller passes to 011e side or the other of the apex 49 between the two'inclined contact faces on the detent. The pressure of the detent thus serves to assure a proper positioning of the roller 37-38 in either one or the other end of the slot 33 and prevents an accidental displacement of the roller from such position. It will be understood therefore that the actuating device 34 is adapted to be` connected to the dog rocker at one point or another thereof and that the movement of the roller in the slot carries the actuating device 'farther from lor nearer to' the pivotal `axis lof the dog rocker, so as to vary the leverage of the actuating memrocker.

The variation of the point of connection of the actuating member 34. on the dog rocker is .automatically effected during the operation of the printing key as will hereinafter more. clearly appear. Thus, the actuating device l34, which is in the nature of by a shouldered screw 50 on the swinging end of an arm or lever 51, pivoted at 52 on the bracket plate 27. A contractile spring 53 iseonnected at one end to a pin 54 projecting from the bracket plate 27 and at its opposite end to a pin- 55 projecting laterally from the lever 5l. A depending' two-part link 5G is pivoted at 57 tothe lever 51, the two members of the link being united by a turn buckle 58.

The lower end of the link 56 is pivoted at 59 to an arm GO which projects rearwardly from a universal bar\61. The universal bar extends transversely of the machine beneath theseries of key levers 13 and is supported at its ends on arms 62 connected to a rockshaft 63 mounted to turn in bearings in the base of the machine.

The angular floatinglever S34-has a horizontally disposed arm 64 which extends between two stops 65 and G6 formed 4on or carried by a plate 67 secured by screws 68 to the bracket plate 27. This plate is made vertically adjustable by making the screw.`

holes a little larger than the screws, or by elongating said holes in an up and down direction.

the path of the arm 64 of the actuating de"- vice 34 in the bodily or floating movement ofthe latter and the stops are operative to effect a turning" of the floating lever on its fulcrum 50 to either one of the two po-' sitions shown in Figs. 3 and 4. This results in moving the vupright arm of thel floating lever nearer to or farther from the' The stops 65 and 66 extend inv l ing the point of connection between the floating lever and the dog rocker and vary- -in the leverao'e accordinofl b 2D l In the operation of the machine a depression of a finger key is effective'to move the associated type bar to the' printing point and to depress the universal bar 61 and lever 5l. The operation of my devices during jne down stroke of the key may be divided into tWo parts. During the first part of the deression of the arm or lever 51, the'fioating ever 34 moves bodily from the normal position shown in Fig. 1, Where the arm 64 is in Contact with the abutment 65, to that indicated in. Fig. 3 Where said arm is in contact with the abutment 66. This movement turns the dog rocker from the position shoivn in Fig. l, vvliereithe dog 29 is in engagement with t-he escapement Wheel, to that indicated in Fig. 3, Where the fixed dog 28 is -in engagement, without disturbing the position of the ioating lever at its point of connection with the dog rocker in the outer end of the slot 33. The extent of key depression necessary to bring about this movement of the dog rocker, is indicated in a general ivay by a comparison of the position of the lever 5l in Fig. 3 with the broken line a in said figure which line indicates the normal position of said lever 51. The movement of the dog rocker just described is effective to carry the `dog 29 out of contact with the escape-y nient Wheel and to bring the flat Working face of the fixed dog 28 into contact with the same tooth of the wheel that was engaged by the dog 29 as shown in Fig. 3. This movement is effected Without affording an advance 4of the escapement Wheel except the very slight advance movement due to the drop of the engaged Wheel tooth from the dog 29 to the fixed dog 28. The partial vdepression of t-he finger key thus far rcferred to is effective to bring about a complete movement of the dog rocker in one direction. A further depression of the finger key is effective to move the parts from the ositious shown in Fig. 3 to those indicated in Fig. 4. During this further depression of the key the actuating device 34 is turned on its pivot 50 by the action of the stop G6 on the arm 64. This turning of the device 34 moves the roller 37*38 to the inner end of the slot 53 as shown in Fig. 4, Without materially moving the dog rocker from the position shown in Fig. 3. In the first part of its motionalong the slot, the roller 37,

' 38 forces the detent 41 upwardly against the tent assist in moving said roller to pull of its spring 47 until said roller passes the apc-x 49, after which said spring and dethe inner end of the slot or that nearest the pivot of the dog. rocker, yieldingly retaining it against accidental displacement therefrom as inditited in-Fig. 4.' -It will be not all that the pivoted dog is drawn out of the Wheel and the fixed dog is drawn in early in the down stroke of the universal bar and that during the remainder ofgsuch down stroke said dogs remain substantially stationary, the fixed dog never being drawn deeply into engagement. As soon as pressure upon the -depressed key is released the lever 5l will.

move upwardly under the pull of the spring 53. The operation due to the up stroke ofthis lever may be divided into two parts, the

'first part being that from the posit-ion shown rocker, one side of the engaged tooth of the escapement Wheel contacts With the inner edge of the dog 29, holding said dog against the the dogs. A slight further movement of the dog rocker is effective to disengage the dog 28 from the engaged tooth of the escapement wheel, allowing it'to pass through the space between the tivo dogs 28 and 29. As soon as the engaged tooth of the escapement Wheel is thus'released, the pressure of the spring 31 ybeing a bodily movement. At the first por- -tion of the return movement of the dog pressure of its spring 31 andtlius separating v iooy is effective to move the pivoted dog 29 int'o the path of the next oncoming tooth of the escapement Wheel, as shown in Fig. 5, to arrest the escapement- Wheel after a letter space movement of' the carriagehas taken place. Tt will be understood, therefore, that vthe let-off of the carriage is effected by a return movement of the lever 51 from the dotted line position indicated at in Fig. 5,

to that indicated by the dotted line o in said figure, and by a corresponding extent Aoi return movement of the finger key, so that the carriage is released or let off almost instantly upon the release of the finger key.

A further upward movement of the finger key affords a further upward movement of the lever 51 from the position indicated by the broken line 0 in Fig. 5, back tothe normal position indicated by the broken line a in said figure. During this second part of the, lreturn movement of the lever 51, the floating lever 34 is turned on its pivot 52 from the position shown in Fig. 5 to that indicatedin Fig. 1, by reason of the engagement of the arm 64 of the floating lever With the upper stop'65. The edectof this turnvingmovenfient of the iioating lever on its fulcruin, is to shift the point of connection between the oating levei' andthe dog rocker,

dog rocker has been effected. It follows therefore that the forward movement of the dog rocker effected at the down stroke of the nger key is produced under a long leverage on the dog rocker', with the floating lever maintained connected with the dog rocker in the position shown in Figs. 1 and '3, whereas the return movement of the dog rocker is effected under a short leverage of the Heating lever on the dog rocker connected at the inner end of the slot as shown 'in Figs. l and 5. It likewise follows that the shift ofthe dog rocker at the down stroke under a long leverage is slower than the return of the dog rocker under a short leverage, thus affording a quick return and quick let-off of the carriage and that there is no lost travel of the dog in the return stroke of the key before the carriage is let off In this construction the entire extent of movement of the dog rockerin one direction is indicated by its movement from the position shown in Fig. 1 to that indicated in Fig. 3, whereas the entire extent of return movement is that indicated by the movement of the dog rocker from the position shown in Fig. l to that indicated in Fig. 5. Moreover, it will be understood that although a change in the relation of the parts by which the key actuated escapement member is controlled is automatically effected, said member is always under control of the keys' in both the down stroke and up stroke of each key. Otherwise stated, there is a constantly maintained operative connection between the linger keys .and the dog rocker notwithstanding the change in the relation between the intermediate connections, and the dogs in their back and forth movements 4through the rack are therefore always under control of the keys and a reliable and positive control of the escapement by the keys is provided and nevertheless a quick let-off of the carriage is 'effected at the first part of the return movement of a key whether the dip of the key be deep or shallow. The escapement therefore is 'rapid in operation, positive in its control of the carriage and efficient in use and is well adapted `to operators having leither a long following stroke, or a sho-rt quick stroke and it isI reliable in its action under. different conditions of use.

The rear beveled faces 24 on the teeth of the escapement wheel cooperate during the backward vmovement of the escapement wheel with a corresponding bevel on the rear side of the feed dog 29 to force said dog to one side out of the ath of the teeth of the escapement wheel w en the carriage is being moved from left to right so that the escapement affords no' obstruction to` the vmovement of the carriage in said direction.

`escapement wheel; that there are intermediate connecting devices between the key controlled escapementl member or dog rocker and the finger ke s; that said intermediate connections inclu e automatically actuating leverage changing mechanism to vary the speed between the movement of the key controlled escapement member in a down-stroke of the key and in an upstroke of the key; that by reason of this automatic change of leverage it requires less movement of a key to effect a complete return movement of the dog rocker than is required to effect a complete movement of the dog rocker from normal position; that there are provided means for automatically shifting the point of connection between a key controlled actuating member and the dog rocker and for moving the point of such connection either nearer to or farther from the pivotal axis of rocker; that the lever 34 constitutes a fioating lever for actuating one of the escapethe dog ICE ment members under control of the keys;

and that said floating lever is cooperative with stops vby which the leveris turned on its fulcrum to vary its position with reference to the member which it controls and with reference to the pivot of the dog rocker.

I believe that I am the first to have-provided automatically operating variable leverage connections between the finger keys and one of the escapement members, the variable leverage mechanism affording a different leverage on the escapement member at the upy stroke of the key from what it does on the down stroke, and while I have shown one form or embodiment of 'my invention it will be understood that various changes may-be made without departing from the spirit and scope of my invention..

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

l. In a typewrting machine, the combination of finger keys; a power-driven'carriage; and escapementmechanism therefor,

said escapement mechanism comprising cooperative escapement members, and automatically operating variable leverage connec-tions between said finger keys and one of said escapement members, the variable leverage mechanism being such to allord a different leverage on the escapementmember at the up stroke of the key from what it does on the down stroke to thereby vary the speed at which said last mentioned member is moved at the up and downv strokes ot' a key.

2. ln a t-ypewriting machine, the combination of linger keys; a power driven car- 'iage; and esca peinent mechanism therefor, said escapement mechanism comprising a dog rocker, and connections from said finger keys to said dog rocker, said connections including automatically operating means for varying the point. of operative connection between said connections and the dog rocker with reference to the pivot of the latter so as to afford a movement of the rocker by a. relative long leverage on the 'down stroke ot the key and a movement of the rocker by relative short leverage on the up stroke et' the ken lr a typewriting machine, the combination of finger keys; a. power driven carriage; and escapement mechanism therefor,I said escapement mechanism comprising a dog rocker, constantly maintained operative actuating connections between said tin.-

Cluding means by which a faster movement of the dog rocker is effected in one direction than in the other.

4. In a typewriting machine, the combination of finger keys; a. power driven carriage; and escapement mechanism therefor, said escapement. mechanism comprising a dog rocker, a key controlled actuating member cooperative with said dog rocker, and automatically operating means for moving said member nearer to the? pivot of the dog rocker at the down stroke of the key and after the dog rocker has completed its movement in one direction.

5. In a typewriting machine, the combi'- nation of linger keys; a power driven carriagc; and escapement mechanism therefor, said eseapement mechanism comprising a dog rocker, a key controlled actuating member copeiative with said dog rocker, and automatically operating 'means 'for moving said member nearer to the pivot of the dog rocker at the down stroke of the key and after the dog rocker has completed its movement in one direction and for autoimiticallyA moving said member away from the pivot of the dog rocker at the up stroke of the key and after the dog rocker has completed its return movement.

G. VIn a typewriting machine, the combination of linger keys; a power driven car-r riage; and escapement mechanism therefor, said escapement mechanism comprising two cooperative escapement members one being movable back and forth relatively to the other under control of said keys, the said key controlled member moving in one direction at the down stroke of the key and moving in the opposite direction at the up stroke of the key, and variable leverage means by which less movement of the key is eii'ect-ive to aiord a complete movement of the said key controlled member in o'ne direction than is required of said key to eiiect a complete movement of the key controlled member in the opposite direction,

7. ln a typewriting machine, the combination of finger keys; a power driven carriage; and cscapement. mechanism therefor, said escapement mechanism comprising two cooperative escapement members, intermedi, ate constantly maintained operative connections between the finger keys and said key controlled member of the escapement to control said member by the keys at the up stroke as well as the down stroke of eachkey, and automatically operating means for changing the relation between the parts of said connections so that less return movement of a finger key is required to return the key controlled member to normal posi- 4tion than is required to move the said memdog rocker to control said dog rocker bythe keys at the up stroke as well as at the down. stroke of each key, and automatically operating means for changing the relation between said connections and said dog `rocker in such a manner that less return movement ot' a finger key is required to rey turn the dog rocker to normal position than is required. to move the rocker tothe limit of its movement from normal position.

9. ln a ty pewriting machine, the combination of tingcr keys; a power driven carriage; and escapement mechanism therefor, said escapen'icnt mechanism comprising a dog carrier, parallel actuating arms between said dog carrier and keys, a member that connccts said parallel arms, and automatically operating means for shitting the point of connection between said member and one of said arms so that the member will have one point ot' connection with an arm during the movement of the carrier in one direction and will. have another pointof connection with said arm during the movement of the carrier in the opposite direction.

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10. In 'a typewriting machine, the combination of :linger keys; a power driven carriage; and escapement mechanism therefor, said escapement mechanism comprising a dog carrier, parallel actuating arms between said dog carrier and keys, a member that connects said parallel arms, automatically operating means for shifting the point of connection between said member and one of said arms so that the member will have one point of connection with an arm during the movement of the carrier in one direction and will have another point of connection with said arm during the movement of the carrier in the opposite direction, and an automatically operating detent to hold the member against accidental displacement 'from either of the two points at which it may be connected with vthe arm.

1l. In a typewriting machine, the combination of finger keys; a power driven carriage; and escapement mechanism therefor, said escapement mechanism comprising a dog rocker,y a key controlled member for actuating said dog rocker, automatically actuated means for shifting said member from .nation of finger keys; a power driven carone point to another on the dog rocker, and a spring actuated detent for assuring the movement of the member from one point to another on the dog rocker and for holding the member against accidental displacement from either of the positions to which it may be shifted on the rocker.

12.v In a typewriting machine, the combination of linger keys; a power driven carria e; andv escapement mechanism therefor, sai escapement mechanism comprising a dog 'rocker having a slotted arm,r a key, actuated member having a roller working in the slot of the dog rocker, automatically ac tuated means for shifting said member to bring the roller in one end or the other of said slot, and a spring actuated detent operating on said member to assure a movement thereof to bring the roller to one end. or the other Iof said slot and to hold the member .against accidental displacement from the position` to which it has been shifted.-

13. In a typewriting machine, the com bination of finger keys; a power drlven carriage; and escapement mechanism therefor, p

rthe dog rocker, the construction and relasaid escapement mechanism comprising a dog rocker, a key actuated bodily movable lever coperative with said dog rocker to actuate it, and automatically acting means for turning said leverl on its pivot to vary the point of connection between said lever and the dog rocker.

14. In a typewriting machine, the combination of,I finger keys; a power driven carriage; and escapement mechanism therefor,

said escapement mechanism comprising a;

dog rocker, a key actuated bodily movable angular lever having one arm operatively Lonnie connected with the dog rocker, and stops in the path of the other arm of said lever t`o turn the lever on its ful'crum and thereby change the point of connection between said lever and the dog rocker.

15. In a typewriting machine, the combination of finger keys; a power driven carriage; and escapement mechanism therefor, said escapement mechanism comprising a dog rocker, a key actuated bodily movable angular lever having one arm operatively connected Vwith the dog rocker, and stops in the path of the other arm of said lever to turn the lever on its fulcrum and thereby change the point of connection between said lever and the dog rocker, the `construction and relative arrangement of the parts being such that the lever is shifted on its fulcrum in one direction at the last portion of thedown stroke of the key and after the dog lrocker has completed its movement in one :direction and is shifted in the opposite. direction on its fulcrum at the last portion of the up stroke of the key and after the' dog rocker has completed its return movement.

16. In a typewriting machine, the combiriage; and'espapement mechanism therefor,

Asaid eseapem'ent mechanism comprising a dog rocker, a key actuated bodily movable llever coperative with said dog rocker to actuate it, and automatically acting means for turning said lever on its pivot to vary, the point of connection between said lever and-the dog rocker, the-shifting of the point of connection between Said lever and the dog rocker being towardandaway from the pivot of the latter to vary the leverage on the do rocker.

17. n a typewriting machine, the combination of'finger keys; a power driven carriage; and escapement mechanism therefor, said escapement mechanism comprising a dog rocker, a key actuated bodily movable lever coperative with said dog rocker to actuate it, and automatically acting means for turning said lever on its pivot to vary the point of connection between said lever and the dog rocker, the shifting of the point vof connection between said lever and the dog rocker being toward and away from the ivot of the latter to vary the leverage on nation of finger keys, a power'driven car-- riage; and escapement mechanism therefor, said escapement mechanism comprlsmg a dog rocker, a fioatmglever connected therevkey controlled lever -connected to .isaid ioating lever, and automatically op f said floating -dog rocker.

erating means for turning-said floating lef Veron its fulcrum during its float-mg move-v ment to vary the point ofconnection between the oatng lever and the dog rocker. 419.' In. a typewriting machine, the combi l"nation of finger keys; a power driven car- 'dog rocker, a key actuated lever pivoted on an. axis parallel with the axis of the dog rocker, a floating lever pivoted on said key actuated lever and connected with said dog rocker, .the axis of the pivot which connects the key actuatedlever and the ioating lever being parallel with. the axis of the dog gi-[the rocker,l and stops which are interposedl in pat-h of a part of the floatinglever to turn it on its pivot and thereby shift the -poiht of connection between the floating lever and the dog rocker.

[nation of a power driven carriage; fingerl 21.' In a. typewriting machinethe combikeys; and escapement mechanism for the carriage, said escapement mechanism comprising an escapement rack, a dog carrier,

intermediate actuating connections between the finger 'keys and the dog carrier including an actuating member, and an abutment in the path ofsaid actuating memberand which shifts it from one point on the dog carrier to another at the .depression of a finger key. y l

22. In aptypewriting machine2 the combination'of a power driven carriage; finger keys; and @carriage escapement -mechanism comprisingl coperative escapement members, a floating key actuated pivoted actuating device operatively connected with one of said escapement members, and automatically operating means for turning said pivoted actuating device on its pivot atthe 4down stroke of a key to vary the-point 'of connection between said actuating device` and the escapement member with which it is connected.

23. In a typewriting machine, the combination of finger keys; a power driven carriage; and escapement mechanism therefor comprising a feed rack, a dog rocker, feed dogs carried thereby, a key actuated bodily movabley actuating member operatively connected with said dog rocker, and an abutment with which said actuating member cooperates in its bodily movement to shiftv it ,relatively to the dog rocker, the construction and relative arrangement ofthe parts being such that said. actuating member is shifted inone direction after the do rocker has moved one dog out and the ot er dog into the rack at the down-stroke of a key and is shifted in the opposite direction after one dog has moved out of and the other dog has moved .into the rack at the up stroke of the key.

vSigned at Grand Rapids, in the county ofl Kent, 'and State of Michigan, this sixth daf of March A. D. 1911.-

GLENN J'. BAinaETfr.v

Witnesses: l

HELEN M. NEWTON, LULU B. VALENTINE.

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