US1342466A - Typewriting-machine - Google Patents

Description

a. A. s ns. TYPEWRIT'ING mcnms. APPLICATION FILED DEC.6.1918.

,1920. 2 SHEETSSHEET l.

Patnted June 8 4 INVENTUR- WITNESEES.

7 HIS ATTEIRNEY a. A. sue, TYPEWRITING MACHINE. APPLICATION FILED DEC. 6, I918.

Patented June 8, 192m,

2 SHEETSSHEET 2 INVENTUR. MM

WITNESSEE- of HE ATTORNEY pairs GEORGE A. SEIB, or IILION, NEW YORK, ASSIGNOB. T0 REMINGTON'TYPEWRITER COMPANY, OF ILION, NE YORK, A CORPORATION on NEW YORK.

TYPEWRITING-MAOHINE;

Specification of Letters Patent. Patent d J 8 1920 Application filed December e, 1918. Serial Nb. 265,512. r i

To all whom it may concern:

Be it known that I, Gnonen A. Sans, citizen of the United States, and resident of Ilion, in the county of Herkimer and State of New York, have invented certain new and useful Improvements in Typewritlng- Machines of'which the following is a specification. I

My invention relates to typewriting machines and more particularly to carriage controlling devices.

My invention has for its principal object to provide improved means for securing uniformity in the letter space position at which the carriage comes to rest after it has been taken temporarily out of control of the escapement mechanism, as, for example, by operating the carriage release mechanism, or by drawing the carriage back for the beginningof a new line. For example, the margin stop is designed to arrest the carriage always at the same letter space position when it is drawn back to the right to begin a new line of writing, but under certain conditions and modes of operation of the machine the carriage will not come to rest at the usual and intended letter space position but will drop one step to the left, so that that particular line of writing will be indented to the extent of'one letter space. tis the purpose of my invention to improve the machine in respect to this particular fault and related faults.

To the above ends my invention consists in certain features of construction and combinations and arrangements of parts all of which will be fully set forth herein andparticularly pointed out in the claims.

In the accompanying drawings,

' Figure 1 is a fragmentary rear elevation partly in section and showing the escapement and some associated parts of a Remington typewriter together with one embodiment of my invention. 7 I

view showing my improvements. Fig.3 is a plan "iew showing the parts in the position they occupy when the carriage is moving toward the operators right.

Fig. 4 is a view similar to part of Fig. 3

but with the carriage moving toward the operators left.

Fig. 5 is a fragmentary enlarged view looking from the left-hand side of the machine and partly in section and illustrating gages the pinion 7.

Fig. 2 is a front to rearv vertical sectional the engagement with and v disengagement from the feed rack of a certain friction shoe.

Fig. 6 is a perspective view of the margin dog and some of its associated parts Figs. 7 and 8 illustrate a modified form of the invention, the former being a plan View, and the latter an enlarged sectional view on the line w0c of Fig. 7.

Fig. 9 is a front to rear sectional view of the machine, but with many parts thereof omitted, the section being taken near the left-hand side ofthe machine.

In certain models of the Remington typewriting machine the main frame includes a top plate 1 011 which a bracket 2 is secured by means of a screw3, said bracket having, asseen in plan view, a sortof yoke or bail shape; and an escapement wheel shaft 4:, Figs. 2 and 3, is journaled at its ends in'the forward and rear arms or branches of said bracket 2, said shaft having an escapement wheel 5 rigidly mounted on its rear end] A sleeve 6- journaled on the shaftt has a feedpinion 7 rigid on or integral with its front end and at its rear'end it carries a ratchet wheel 8 which is engaged internally bylapawl pivoted to the forward face of the escapement wheel 5. The carriage 9 of the machine carries a feed rack 10 which en- Said ,feedrack is so mounted on the carriage that it can occupy the normal operative position shown in Fig. 2 or can beraised out of engagement with the pinion 7 to release the carriage, the raised positionof the rackbeing shown in full lines in Fig. 5, and the normal position by dotted lines in said figure. The carriage is drawn toward the operators left the usual main 'springll coiled in a drum 11 and connected with the carriage by a band or tape 12. The construction isfs'uchthat when the carriageis moving toward the left under the pull of the tape 12 the pawl and ratchet S constrain the escapement wheel 5 to turn with the sleeve 6, but when thecarriage is pulled back toward the operators right the ratchet wheel 8 can click; idly over its pawl and the escapement wheel 5 -can stand at rest; and also the carriage canbe released from the escapement and movedindefinitely in either direction without turn- .ing the escapement wheel by lifting the Y dated July 2, 1918.

parts,'are more fully shown and described in the patent to E. E. Barney, No. 1,270,918,

One form of dog rocker and feed dogs isv shown in Fig. 1, these parts. as well as' the balance of the escapement mechanism rocker 13 and the stepping dog 16 is pivoted to saiddog rocker on a fore and aft pivot 17 and is capable of vibrating between the two stops 18" and 20. A light spring 19 is provided to throw the dog over against the stop 20 when it is not held by a tooth ofthe'escapement wheel against the stop '18. The loose dog is normally in engagement with the escapement wheel and normally againstthe stop 18, as shown in Fig. 1. The dog rocker is vibrated by means of any suitable connections from the universal bar and'space key acting through one or more pins or studs 21 on the lower endofan arm 22, which arm projects below i the pivots 14, said arm being secured to the dog rocker by a screw 23 and adjustable by means of a screw 24, all in themanner more fully set forth in my pending application above referred to. a

"My invention, in the forms shown in Figs. 1 to'6, includes a third dog 25 in addition to the two dogs 15 and 16 that are mounted on the dog rocker. This third dog 25 I sometimes call a margin dog becauseone of its functions'is to control the escapement in such a way as to insure an even left-hand margin to the Writing. The dog 25 is in the nature of a bell crank including a horizontal arm lying in right and left-hand direction and'terminating in a tooth 26 adapted to engage one of theteeth 27 of the escapement wheel 5. In the present instance, and'preferably, the margin dog engages thesanie tooth 27 that is engaged by the feed dogs 15 and 16 or is in position to be engaged thereby, and which is accordingly sometimes called the zero.tooth. The dog 25 is pivoted on a vertical, headed stud 28 secured at its lower end in a base plate 30 'which in 'turn is secured to the top plate 1 by two screws 31 passing through elongated holes or slots in the. plate 30; said slots'providing for adjustment of said plate toward and from the escapement wheel. In order to provide a long pivot forjthedog 25 said dog has an arm thereof bent up into a yoke piece 32 and again bent horizontally to form an ear 33 so that the dog is pivoted on the stud 28 at two points I spaced wide apart. A spring 34 coiled around the stud 28 tends to turn the dog 25 into engagement with the escapement .Wheel; that is to say, it tends to move the end of said dog toward the rear of the machine. The motion of the dog is limited in that direction by the escapement wheel itself'and in the other direction by a pin 35 projecting from the base plate 30.

The dog 25 has a forwardly projecting arm 36 to which a spring friction shoe 37 is secured by rivets 38. This shoe may be made of spring metal lighter than the balance of the dog and its forward end bent upward and thence forward into such position as to come into frictional contact with the under edge of the feed rack 10; and the contacting part of the shoe is enlarged and appropriately shaped to answer its purpose. The manner of the engagement or contact of'the shoe ,37 with this rack 10 is indicated in Fig. 5 which in full lines shows the rack in its elevated or carriage-releasing position in wh1ch 'position the shoe 37 does not touch the rack; but when the rack drops down to its normal position shown in dotted lines it comes against the shoe 37 bending it down:

slightly and thus putting said shoe under light spring tension against the rack. The spring shoe 37 is considerably stiffer than the spring 34, the latter being quite a light sprin with the'result that when the car- 2: riage is at rest or is moving in letter space 7 direction as shown in Fig. 4, the friction of the rack 10 on the shoe 37 more than overcomes the spring 34 and retains the dog 25 out of engagement with the wheel; al though during the return motion of the carriage for the beginning of a new line,

the spring 34 can and will move the dog 25 into engagement with the escapement wheel as shown in Figs. 3 and 6. Moreover,

the carriage be released from the escapement by raising the rack 10 the frictional contact betweensaid rack and the shoe'37 V is broken and'the dog 25 isthen free to be thrown into the wheel by the spring '34. Even when the carriage is drawn back toward the right without raising the rack 'it isstill the spring 34 that moves the dog into engagement rather than the frictionof more quickly than the carriage. When said carriage is started back toward the right therefore the rightward motion of the rack the shoe 37 because said spring acts much 10 permits the. dog to move into the wheel 2 rather than causesit to do so. If the spring 34 were eliminated then of course the friction of the rack 10 on the shoe37 would movethe dog 25 into engagement with the escapement wheel on the return movement of the carriage and when; the dog-is kicked out then thefriction keeps to the control of the escapement. Otherwise evenwhen the escapement was operated the carriage would be held by the dog 25. To this end said dog 25 is formed with a depending arm 40 and a device operated by the escapement mechanism is adapted to strike against this ear 40 and move the dog 25 toward the front of the machine out of engagement with the wheel 5. In the present instance said device consists of an adjustable screw 41 screwed through'the upper part of the dog rocker. It will be perceived that this motion of the-dog is effected both against the tension of the spring 34 and also against the friction between the shoe 37 and the rack 10, and that-said friction will prevent the dog from coming back into engagement with the wheel. When the carriage is drawn back to begin a new line therefore, the dog 25 comes into action, but

it is thrown out of action by the first operation of the dog rocker and it remains out of action as long as the writin'g'operation continues in that line, comlng into actlon again whenever the carriage is moved.

toward the right or is released from its escapement by the lifting of the rack.

A margin dog of the general sort here set forth has preferably associated therewith a detent dog to prevent backward turning of the escapement wheel at least beyond a certain fraction of a tooth space,- and 'I have provided such a dog andmounted it on the same base plate 30 as my margin dog. Said base plate, which is here shown constructed of sheetmetal, has a bracket'42 bent upward therefrom and,'in order to1: revent backward rotation of the escapement wheel, a gravity detent dog 43 is pivoted to said bracket on a horizontal stud 44 projecting toward the front of the machine from the bracket, said dog having ears 45 by which it is pivoted. The left-hand end of the dog 43, as viewed in Fig.1, engages the second tooth 27 from the so-called zero tooth and said dog is prolonged toward the right in said figure to form a counter-balance .47, the weight of which restores the dog into engagement with the wheel. The downwardmotion of th1s counter-we1ght 1s conven iently limited by the upper end of the pivot 28 and the motion of the dog in the other direction is limited by a pin 46 projecting forward from the bracket 42. Any other suitable form of detent can be employed but the one shown is eflective and convenient especially'as it is mounted on thesame base as the margin dog so that this entire apparatus can-beput on the machine and removed therefrom asla unit. With'the two dogs 25 and 43 both in action it will be perceived that the escapement wheel is held in its proper position whether or not it is under control of the loose dog 16 at the time. 7

In Figs. 7 and 8 I have illustrated a modi-.

fication of my invention which performs some, but not all, of the functions of the form shown in Figs. 1-6. In this simpler form of the invention the margin dog 50has a tooth 49 adapted to engage the zero tooth 27 of the escapement wheel in the same manner'as the dog 25 of the other form,"and

said dog 50 also has a depending ear 51 adapted to be struck by the screw 41 to'move the dog out of engagement. The dog 50, like the dog 25, is of bell crank form having a forwardly directed arm 52' having frictional connection with the carriage, the frictionalcontact'in this instance, however, being not with the rack 10 but with the tape 12. The arm 52 extends beneath said tape in such position as to bend-the tape upward enoughto produce the desired friction. In

this instance the dog 50 is staked on a hub f 53 which is pivoted on a stud screw 54 screwed into a base plate 55 which is secured to the top plate by screws 56 andmade ad'-' justable in the same manner as the base which the screws 56-pass. A'stop pin 57 is provided similar to the pin 35. In these Figs, 7 and 8 I have shown' a different form of detent consisting of a light spring 60 lying on the top plate 1 and having its free end in position to engage the tooth 27 next behind the zero tooth of the escapement wheel. This is a well-known form" of detent and is here shown provided as usual with a guard 61 consisting of a stiffer piece of sheet metal lying on topof the detent 60 plate 30 by elongating the holes throughfor the greater part of its 'length. This guard and detent are here shown as securedto the top plate 1 by the same screws 56 as the plate 55,said plate 55 beingmount'edon top of the guard 61. V It willbe perceived that this form of the margin dog is not provided with any spring like the spring34 but is moved into engagement with the escapement wheel by the friction of the band 12' when the carriage is moved toward the operators-right. It is thrown out of engagement at the firstoper- I ation of the dog rocker by the screw41 acting on the ear 51 and it is retained out of action by the friction of the band 12, as

well as by the fact that there is nothingin particular to cause it to .come back into action. In this form-of the invention it will i so end ofthe lever lying beneath the feed rack ate with a stationarystop 74 pivoted at 7 be perceived that the margin dog engages the wheel whenever'the carriage is moving -,toward the, rightwhether or notsaid carriage, is released by raising the feed rack 10. This form of the invention, is effective to cure the faults found with, the left-hand margin of the writing and in all other instances where the carriage is actuallymoved backwardtoward therright by any means; butjitis not effective when the carriage is .moved toward the operators left, that is to say, in letter feed direction, when said carriage is released from the esca'pementmechanism asfor example in an ordinary tabulating operation. In this respect and pere V haps in other respects the first form of the invention is superior to this one.

.Inorder to make the relation of my 1mproved mechanism to the remainder of the machine more apparent I have illustrated in Fig. 9- some of the parts of one form of typewriting machine in which my invention 7 which defines the left-hand edge of the is shown embodied; In this machine the 1 top plate 1 is supported on corner posts 64 risinglfrom a frame base 65. Thecarriage Sis; supported'by' ball hearings on rails '66 'mounted on the top plate 1. At each end of said carriage a releasefkey lever 67 is pivoted on a screw 68, the key 70being at the forward end of said lever and the rear 10,-which'feed rack is mounted ion arms pivoted to the carriage but which arms do not show in the drawing. 7 The carriageand its appurtenances shown are of the kind heretofore used in the Remington machine. A margin stop'7l is mounted on a bar 72 at the front of the carriage and it is adjustable in a right and left-hand direction by 'means of-a handle 73. The stop 71 shown in the drawing is the left-hand-margin stop paper and at the right side of the carriage is a sim lar stop which controls the line lock mechanism; Both of said stops cooperto the forward rail 66 at the middle of said rail. V 1

Themachine is. shown equipped with a column selecting tabulator comprising a column'stop bar 7 6 mounted on arms 77 wardly projecting. ends of said levers beingpivoted to the rear ends of horizontal links I 86 which at their forward ends are pivoted to levers 87 which leversare fulcrumed .ona transverse rod or shaft .88 in the base 65.

The levers 87 are operated by sliding keys 90 at the back of the keyboard. At its upper part the frame or casing 81 contains ,stop mechanism such as is shown in my patent No. 1,132,286 granted March '16, 1916. As is fully explained in said patent ,this stop mechanism is capable of arrest ing the carriage when the latter is traveling either toward the .left in letterfeed direc-' tion or toward the right.

. lVheneverone of the keys 90 is pressed the carriage is released from' the escape.- ment, the means for this purposecomprising a universal bar 91 mounted by means of arms 92 on therod or shaft 88in such posi tion that said universal bar is pushed toward the rear every time one of thexlevers 87 is operated. Said universal bar is connected by meansof links v93, one at eachend rock shaft 95 mounted inbrackets 96 in the base part 65. At near its middle said rock shaft has another arm 97Iwhich is, con.-

. tliereof with arms=94 depending from a 7 nected by means of along link 98, with the" rear endof a:lever1100 of the first order pivoted ontop of the top plateland having its forward end beneath the rack 10. The

constructionis such that the rear end of said lever is pulled downward when a tabugla'tor keyis operated and its forward end lifts the rack 10 out of thepinion 7. I

have not deemed it necessary to bring out 100 all of the details of this mechanism in this drawing because they are well known in the J art and are shown in my patent above referredtoyand n pract1ce this lever 100 carries a retarder devlce throughwhichthe feed rack is lifted-as in the regular Remington machine.

The carriage can be moved backward'one letter space pos1t1on at a time by means of a back spacing'key 101, the keylever 1020f which is pivoted at the rear of the machinc on a pivot rod 103 which rod. also serves: as

a pivot for the printing key levers; and the lever 102 is normally held up by a sprinn 1041 connected at its upper end to a cross bar 105 1 which cross bar also carries similar springs connected; with the printing key' levers. The lever 102 is connected by means of a link 106 with an arm 107 projecting from a rock shaft 108 journaled in theupper part of the machineand having projecting rearward therefrom another arm 110 certain certain devices 111 terminating in a back spacer pawl 112 which pawl takes hold of the ratchet wheel 8 and turns itin the direction the reverse of its letter feed direc-' tion, thus'moving the; carriage backward or toward the right through the instrumen- 'tality of the. pinion 7 and rack 10; This back spacer mechanism is fully shown and with the rear end of which are connected I described in the patent to E. E. Barney,No.

1,270,918, granted July 2, 1918. r

The printing mechanism includes front strike type bars 113 pivoted to .a segment 11% and connected in any suitable way. with printing key levers not shown. All of said type bars however operate a segmental universal bar 115 having arms116 projecting therefrom toward the rear of the machine, their rear ends being supported by arms 117 rising from a rock shaft pivoted at 118' to brackets 120 depending from the top plate 1. A link .121 is connected with one of the arms 117 and extends thence toward the rear of the machine where it is connected with one of the pins or studs 21 on the dog rocker arm 22. The details of this universal bar construction and its connections withthe dog rocker are all more fullyshown in my prior application Serial No. 118,607, hereinbefore referred to.

A space bar 122 may be mounted in any suitable way and connected with the dog rocker by any suitable means.

The line lock mechanism includes a channel bar 123, adapted to engage and lock a hook 121 on the back spacer key lever 102, and similar hooks on the printing key levers. The locking bar 123 is pivoted at 125-; and at its left-hand end has an arm 126 from which a link 127 rises, said link being controlled, through connections not shown, by a'transverse sliding motion of the stop 741;

It is new as far as I am aware to provide a margin dog with means whereby it is thrown out of action by the operation of the printing keys or a space key and with means whereby it continues out of action during the i operation of writing and comes into action again only when it may be needed. In this respect my device works according to a new mode of operation and a new principleand it is therefore my intention to claim this improvement broadly.

It is believed that a better or clearer understanding of the scope of my improvements will be had by describing how more in detail the important features thereof and their peculiar functions or modes of operation under the varying conditions which from time to time arise in the operation of the typewriter. V v

,The dog carrier or rocker is always free I to be rocked or vibrated, whether the carriage is in transit back orforth. Hence every time a letter key or the space key is operated the dog carrier is moved and the stepping dog passes out of engagement with the escapement wheel and steps to the left while said wheel is held by the rigid dog. If this action should take place while the carriage is arrested in its leftward travel or if it should take place during a retraction of the carriage, a letter space would be lost when the carriage is arrested at the end of its rightward travel but for the presence of my improvements, because eventually in either instancethe stepping dog will return to the wheel in a one-tooth advanced position. Hence when the carriage return move ment has ceased and the spring drum' is again effective to exert its propelling power on the carriage the feed rack, the feed pinion and the escapement wheel will move and the stepping dog will be carried back by the 1 wheel to normal position againstits rightcapement wheel and will make its leftward step as usual, but owing to the engagement of the carriage with the margin stop there will be no stepping of the carriage at this time. Immediately, however, the retraction of the carriage is started the margin dog or hook is caused to'engagewith a tooth of the escapement wheel and thus hold it from moving or stepping as long as this margin.

dog or hook is engaged with said wheel, and

it will remain thus in engagement until a letter key or space key is again struck. Hence when the carriage is fully retracted and arrested by its margin stop and the carriagespring is 'againffree to exertits influence' the carriage is unable to make thefalse step referredto byreason of the fact that the margin dog is still holding the escapement wheel against rotation; andat this time it will be noted that the stepping dog is-over against its left-hand stop and ready to be vibrated against its right-hand stop the moment the escapement wheel is permitted to rotate. Thus it will be seen that when the returned carriageis brought back against its margin stop, which for example we may say is set at 5? .on'the scale, the carriage will be arrested at 5 and the nextletter printed will take place at 5 in stead of at 6 as would be the case were it not for the margin dog, though the stepping dog is out of its normal holding position. The first key struck at 55 will vibrate-the always free rocker and this movement of the rocker will force or kick back the'margin dog or hook, and thus allowthe escapement wheel to turn upon relief of the type key from pressure, this turning of the wheel permittingthe stepping dog to be brought up against its right-hand stop again and permitting also the feed pinion, the rack and the carriage to move one step in printing direction. Thereafter, until anotherretractive However, thehook or margin dog is adapted to en- Q gage with the escapement wheel'and hold it,

and through itthe rack, the pinion and the carriage, from making a false step whenever the rack and pinion may be separated, either by an operation of the carriage release key or by an operationof any tabulator key. The momentsuch a rack-and-pinion separation occurs the margin dog is caused automatically to engage a tooth of the escapement wheel and hold it insubstantially the same way that it does when the carriage is retracted] without separating the rack and pinion. The margin dog in both instances referred to is caused to engage a tooth of the escapement wheel by the action or recoil of the spring 34:, which is prevented normally from causing the margin dog thus to act by the friction of the carriage rack on one arm of the pivoted margin dog device, this friction having at all times, excepting when the carriage is being returned, a tendency to force or hold said friction arm in the direc tion of the letter feed movement of the carriage, and this tendency or action serves to maintain the. hooked or margin dog arm of the device in forward or non-operative posi tion. As soon, however, as the friction operates in the opposite directionby the return push or pull of the carriage, then the spring is free to operate immediately upon the margin dog and swing it rearwardly so as to engage the operative face. of one of the teeth of the escapement wheel andthus hold it I indefinitely or until the next vibratory riage controlling mechanism, the combination with an escapement wheel and vibratory means for controllingthe step by step rota movementof the dog rocker is effected by a subsequent action of one of the type keys or the space key. Of course when the feed rack is raised there is. then no friction upon the margin dog device to hold it in inoperative position and then the spring acts immediately to move the hooked end of the device into engagement with the escapement wheel, and there it will remain even though the rack'and' pinion be reengaged until the dog rocker is again vibrated gin dog holding device, and that: once the spring has been "permitted to act, the margin dog cannot be restored to non operative position by friction between the said parts but only by a positive movement of the dog carrier, and that when that takes place the aforesaid friction may again predominate and the margin dogv will be held out of service until the friction is either wholly removed or reduced in powerbelow that of the tension of the spring. In the innnediately preceding" description it will be understood that some of the modes of operation or functions performed do not take place'inthat modification of my invent on shown in Figs. 7 and 8 where the'carriage strap or tape is used to obtain the frictlon for the margin dog instead of the rack as in other figures, and for this reason the construction shown in Figs. 1 to 6 inclusive and Fig. 9 is the preferred construction.

' Various-changes may be made in the de tails of construction and arrangement without departing from my invention.

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

1. In a typewriting machine and in carriage controlling mechanism, the combina- I tion with an'escapement wheel and key controlled feed dogs cooperating therewith, of a third dog for engaging and holding said wheel against stepping, and means for maintainingsaid third dog out of action during the operation of writing.

2. In a typewriting machine and in carriage controlling mechanism, the combination withian escapement wheel and vibratory means for controlling the step by step rotation of said wheel, of a margin dog for engagement with said wheel to hold the latter against stepping, said margin dog beingmovedout of engagement with said wheel by said vibratory means, and means for 'maintaining said margin dog out of action during the operation of writing;

3. In a typewriting machine and 111 cartion of said wheel, of a margin'dog for en gagement with said wheel to hold the latter against stepping, said margin dog being moved out of engagement with said wheel by said vibratory means, and means for mainta ning said margin dog out OffiCtlOIl during the operation of wr ting and for bringing said dog into; action during the means for controlling the step by step rota:

tion of said wheel and a carriage'release mechanism, of a margin dog capable of holding said wheel against the force of the carriage spring in caseof a false operation of said vibratory means, said dog being moved out of engagement with said wheel by said vibratory means, and meansjfor moving said dog into engagement, with said wheel when said carriage release mechanism is operated.

5. In .atypewriting machine and in .car-

riage controlling mechanism, the combination with escapement mechanism and carriage release mechanism, of a""margin dog capable of holding the carriage against the force of its drivingspring in-case of a false operation of said escapement mechanism,

and means whereby said margin dog is.

brought into action by an operation of said carriage release mechanism. I

6. In a typewriting machine and in carriage controlling mechanism, the combination with an escapement mechanism and carriage release mechanism, of a margin dog capable of holding the carriage against the force of its driving spring in case of'a false operation of saidescapement mechanism, means whereby said margin dog is brought into action by an operation of said carriage release mechanism, and means whereby an operation of said escapement mechanism throws said margin dog out of action.

7. In a typewriting machine and in carriage controlling mechanism, the combination with carriage escapement mechanism, of a margin dog, means whereby said margin dog is thrown out of action by an operation of said carriage escapement mechanism, and means whereby said margin dog is brought into action by the act of restoring the carriage toward the right.

8. In a typewriting machine and in carriage controlling mechanism, the combination with carriage feed mechanismincluding a releasable feed rack, of amargin dog having frictional connection with said rack, such frictional connection being broken by the act of releasing said rack.

9. In a typewriting machine and in carriage controlling mechanism, the combination with carriage escapement mechanism and carriage release mechanism, of a margin dog, means whereby an operation ofsaid carriage escapement mechanism throws said margin dog out of action; and 'means whereby the return motion of the carriage and also an operatlon of sa1d carriage re lease mechanism throws said margin dog into action. w

10. In a typewriting machine and in carriage controlling mechanism, the combination with carriage escapement mechanism and carriage release mechanism, of a margin dog, frictional means for maintaining said dog out of action during the letter feed movement of the carriage, and springmeans for moving said dog into action when said carriage release mechanism is operated.

11. In a typewriting machine and in carriage controlling mechanism, the combination with escapement mechanism and a feed rack, of a bell crank, onearm of said bell crank having frictional connection with said feed rack, and the other arm acting as a margin dog, and'means whereby said margin dog 1s thrown out of action by an operation of sa1d escapement mechanism.

12. In a typewriting machine and in carriage controlling mechanism, the combination with escapement mechanism, of a margin dog for holding the carriage against the force of its driving spring, sa1d margin dog having frictional connection wlth the carria 'e and means whereb said mar in do t3 7 b 23 and feed dogs for controlling the said wheel, of a margin dog in the form of a bell crank,

one arm of said bell crank adapted 'for engagement with said wheel and the other arm.

having frictional connection withthe car riage; and means whereby anjoperation ofsaid feed dogsmoves said margin dog outof engagement with said wheel.

15. Ina typewriting machine and in an escapement mechanism, the comblnatlon of a carriage,a releasable feed rack, a margin dog, and means for enabling the margin dog automatically to engage the "escapement mechanism whenever the rack is released and to maintain its said engagement "after the rack is restored to normal position. 7 16. In a typewriting machine and in an escapementmechanism, the combination of acarriage, a releasable feed rack, a margin dog, and a spring for causing .the margin dog automatically to engagethe escapement mechanism whenever the rack' is released.

and to maintain its said engagement after the rack is restored to normal position.

17. In a typewriting machlneand in an escapement mechanism, the combination of a carriage, a releasablefeed rack, a -margin dog, a spring for causing the margin dog] automatically to engage the escapement mechanism whenever the rack 'is'released, and friction devices for holding said margin dog non-engaged when the rack is in working position.-

18. In a typewriting machine and in an escapement mechanism, the combination of a carriage, a releasable feed rack, a margin dog, a spring for causing saidmargin dog automatically to engage the escapement mechanism whenever the rack is released, means carried by the escapement mechanism for disengaging said margin dog whenever a keyis operated, and friction means connected with a moving part of the carriage for holding said margin dog normally disengaged.

19. In a typewriting machine and in an escapementymechanism, the combination of a carriage, a margin dog, friction devices for holding said margin dog in normal nonoperative position, and a spring for causing said margin dog to move to operative posi- ,tion when said friction is removed or re-' duced.

20. In a typewriting machineand in escapement mechanism, the combination of a carriage, a margin dog, friction devices connected with the carriage for keeping sald margin dog normally in non-operative osition and a s rin for throwin said a o b dog into 'operatlveposltion during a requiescent but adapted to move and hold the I escapement wheel after thestepping dog has made a false step and to maintain said hold on said wheel until a space key or character key is operated.

Y 22. In a typewriting machine, the combi:

nation with an ,escapement mechanism com-. prising'an escapement wheel, a stepping dog and a holding dog, of a normally quiescent margin dog adapted to move and engage and hold said escapement Wheel until :and

after the carriagehas been arrested in its return stroke, and means connected with the. keyboard for restoring said margin dog to normal position. t

23. In a typ'ewriting machine, the combi nation with an escapement mechanismcomprising an escapement wheel, a stepping dog andv a holding dog, of a, normally quiescent margin dog adaptedto be moved into, engagement with said wheel and holdit at the commencement of the retractive movement of the carriage and to maintain'its hold 011 said wheel after the retractive movement of the carriage has entirely ceased and is in condition again to commence its forward or leftward movement by operating the printing keys. 4

Q LIn a typewriting machine, the combination of an escapement mechanism comprising anescapement wheel, a dog rocker carrying a steppingdog, and a normally quiescent margin dog adapted to be moved to engage said wheel without interfering withthe free vibration of said dog rocker whereby said wheel-and the carriage are held from thus making a false step although the stepping'dog may be caused to make such a step. I v

.25. In a typewriting machine, the combination ofia carriage, an escapement mechanism comprising an escapement wheel, a dog rocker carrying a stepping dog, said rocker being free to be vibrated after the forward movement of the carriage has been arrested by 1ts margin stop, whereby said stepping dog may be moved to a false posltion, a margm dog caused to engage said wheel lmmediately the carriage is started to the right and tohold said wheel against turning until a character has been printed, whereby the errorwhich would have been occasioned by the false stepping of the stepping dog is corrected-by the holding of the escapement wheel.

26. The combination with an escapement wheel and two cooperating feed dogs, one of which is a stepping dog capable of assum! ing a false position, of a third dog normally inactive but adaptedto' take the place of said stepping cdog, means for movingsaid third dog into action when the carriage 1s retracted, and means for moving said third dog out of action at the: next succeeding operation of a character key or space key.

27. The combination. with a carriage, can escapeinent' mechanism, and a releasable feed rack, of a dog capable of holding the carriage against stepping motion, means whereby said dog is normally held out of action by said feed rack, and means whereby said dog, when in action, is thrown out of action by an operation of said escapement mechanism. t V Signed at Ilion, in the county of Herkimer and State of New York, this-2nd day of December, A. D. 1918.

V GEORGE AI'SEIB.

Witnesses? 7 I LINNIE BURNETT, THERESA CRoUsE.

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