US1543193A - Typewriting machine - Google Patents

Description

June 23, 1925.

C E. SMITH TYPEWRITING MACHINE Filed Nov. 9, 1924 2 Shgets-Sheet 1 WITNESSES ATTORNEY June 23-,- 1925 1,543,193

' C. E. SMITH Y TYPEWRITING MACHINE Filti Nov. 8, 1924 2 Sheets-Sheet 2 INV'ENTOR WITNESSES a f ATTORNEY to recondition them again for use.

Patented June 23, 19255.

nnrrs' stares PATENT easier.

CHARLES E. SMITH, OF BROOKLYN, NEEV- YORK, ASSIGNOR T0 REMINGTON TYPE- WP/ITEB COMPANY, OF ILION, 3513B?!- YQEK, A. CORPORATION OF NEVT YORK- TYLPEWRITING MACHINE.

Application filed November To all whom it may concern:

Be it known that LCHAnLn's' E. SMITH, a citizen of the United States, and resident of the borough of Brooklyn, city of New York,

in the county of Ixings and State of New York, have invented certain new and useful In such machines it is common to condition them to prevent injury to parts thereof while they are being carried or transported, and In some such machines it is possib'l e'to operate'the printing instrumentalities to strike the platen or the'paper thereon before the machine has been fully conditioned for use. This may result in destroying or marring the work sheet before the operator observes that the machine is not fully conditioned to proceed with the work.

The main object of my invention is to provide, in such a machine, improved means for overcoming this objection, and to compel a complete conditioning of the machine for use before the operator is enabled to operate the printing instrumentalities.

'To the above and other ends-which will hereinafter appear, my invention consists in the features of construction, combinations of devices and arrangements of parts hereinafter described and particularly pointed out in the claims.

In the accompanyingdrawings, wherein like reference characters indicate corresponding parts in the different views,

Figure 1 is a rear elevation with parts in section of a Remington Portable machine embodying my invention, the machine being 7 shown enclosed within its carrying case.

Figure 2 is a fragmentary vertical foreand-aft sectional view of the machine with parts omitted, the machinebeing shown only partly conditioned for use- Figure 3 is a detail fragmentary bottom plan view of the machine with parts omitted.

Figure 4 is a detail A erspective view of the key locking lever modified in accordance with my present invention.

Figure 5 is a detail fragmentary perspec: tive view showing a portion of one of the printing key levers and the locking bar with s, 1924, Serial No. 748,515.

which it .coacts to lock the printing instrumentalities against printing operation.

Figure 6 is an enlarged detail fragmentary sectional view taken on the line 66 of Figure 2 and looking in the direction of the arrows at said line.

I have shown my invention embodied, in the present instance, in a Remin 'ton Portable machine, in which. the invention may be readily included with but avery slight change in the existing structure.

In the Remington Portable machine in order to condition the machine for use, the type bars must first be expanded by one operation to a position where they are free to strike against a platen, and the center lock for the carriage must be hand released and the escapement rendered effective, by another operation. 1 It sometimes happens that the operator will expand the type bars and forget to hand release the center lock and render the escapement effective to restrain the movement of the carriage. The operator may then proceed to write and not discover that the carriage cannot. be fed until the work sheet is marred, mutilated or destroyed. In accordance with my invention, as it is exemplified in the present instance, this difficulty is overcome by automatically locking the printing keys whenthe hand controlled center lock is rendered effective and the carriage is centered and the escapement is rendered inefiective'to restrain the carriage, and by automatically releasing said keys when the center lock is rendered inefiective and the escapement rendered effective to restrain the carriage. It follows,l.therefore, that the printing keys cannot be actuated if the center lock is hand positioned to lock the carriage and render the escapement ineffective to restrain the car iage, thereby notifying the operator that the machine mustbe further conditioned for use by releasing the center lock and re-establishng the escapement inoperative condition. I j I Various parts of the presentconstruction are disclosed and claimed in the application of Joseph B. Holden, filed Oct. 9, 1924, Sr. No. 742,528, the claiins of this case being restrictedtol features not disclosed in said Holden application. 7

In the ordinary operation of a typewriting machine it is necessary at times for an operator when making corrections to crowd in ill several characters in a space formerly occupied by fewer characters. This is sometimes done by releasing the carriage by the ordinary release key and moving the carriage by one hand to, and holding it at, the desired fractional letter space point to insert a character, while the operator, with the other hand, stri res the appropriate key to print the desired character to be inserted at the point in question, and so on with the remaining characters to be inserted. The

main object of the present invention is to accomplish the general ends hereinbefore pointed out and yet enable crowded insertions to be made in the manner indicated above, as will hereinafter more clearly appear.

In the accompanying drawings 1 have shown only so much of a Remington Portable machine as is necessary to arrive at an understanding of my invention in its embodiment therein.

The machine comprises an outer sheet metal frame 1 and an inner frame 2, which latter supports most of the working parts of the machine. Each type action comprises a key lever 3 fulcrumed at L and provided with a key 5. Each key lever is connected through a link 6, sublever 7, second link 8, and second sub-lever 9 with a type bar 10. Operative connection is established between each sublever 9 and the associated type bar by segmental rack sections 11 and 12. The type bars are all mounted on a pivot wire 13, on which the" are adapted to be turned from a collapsed locked position to the effective position for use, shown in Fig. 2, when ordinarily they may be actuated to strike downwardly against the top face of the platen always maintained in the path thereof. The means for effecting this conditioning of the type bars for use or for transportation of the machine, comprises a rock shaft 14, controlled by a hand actuated crank arm 15. This rock shaft also carries crank arms 16, pivoted to links 17; the latter being pivoted at their upper ends to a vertically shifta-ble support 18, having a pad 19 on which the type bars rest.

The non-folding carriage of this machine is mounted on its support in the usual manner to travel from side to side of the machine, and to shift with the support fore-and-aft of the machine in the case shifting movements of said support; the carriage alwayssupporting the platen in position for use. That portion of the case shift frame on which the carriage support is mounted, and the means for shifting it to change the case position of the platen, are of the usual construction, but are not shown in order to avoid confusion and afford a better illustration of other parts of the construction. The carriage comprises a body plate or portion 20 to which end plates 21 are secured. The plate 20 is formed with hearing port-ions 22 and 23 in-which crossed bearing rollers 2e are received. Said rollers bear against com- Janion tracks 25 and 26 on the carriage support 27, and thus support the carriage for traveling movement and always maintain it in operative position. A platen spindle 28 is mounted to turn and to slide longitudinally in hearings in the end plates 21, the spindle being provided at oneend with a finger wheel 29. A platen is mounted on the spindle 28 to turn therewith and permita longitudinal shi fting movement of the spindle independently of the platen, byreason of a pin and slot connection (not shown) between the platen and shaft. This feature, and the co-Operation of the spindle with the center lock for the carriage, and the release of the carriage by the center lock, to be hereinafter described,

are fullydisclosed and are claimed in the co-pending application of Joseph B. Holden, Sr. No. 547,128, filed March 27, 1922.

A hand controlled lever 31 is pivoted at 32 on the left-hand end plate 21 of the carriage. This lever comprises three arms, one of which constitutes alocking finger or member 33, whereas the second terminates in a inger piece 3st, and the third terminates in a locking finger or member 35. The looking finger 33 passes into a transverse slot in the hearing member 21 for the left-hand end portion of the platen spindle 28. In one position of the finger 83, it extends across the bore of said slotted bearing member 21 and in the path of the spindle, to prevent a longitud nal displacement of the latter and the finger wheel 29 from the dotted to the full line position shown in Figure 1. From an inspection of this figure,

it will be seen that when the finger wheel 29 is drawn out to the dotted line position for use, it extends into the path of a side wall of the carrying case as and "ants the cover from being closed. The oprator is compelled therefore to shift the lever 3 from the aosition where the finger thereon lcks the spindl 28 against longitudinal movement to the Fig. 2 position before the finger 1 9 wneel 29 can be shifted from its obstructing position. In this last mentioned position the spindle with finger wheel is free to be shifted from the dotted to the full line position in Figure 1. lVhen thus shifted, the spindle extends across the path of return movement of the locking linger 33, effected by a spring 37, and locks the lever 31 in the Fig. 2 position. The effect. of this is to leave the carriage free from restraint of its escapement mechanism and to maintain the lock effective. Thus it will be seen that the finger piece is bent riage and constitutes a support for the feed rack 41 of thecarriage escapement mecha msm. The plate, controlling member, or rack-support 40 is pivoted at 42 for independent movement on bracket arms 43 see cured to the body plate of the'carriage. Springs 44 bear against the plate and normally hold the plate at the limit of its forward movement with the teeth of the feed rack engaging the feed dog 45. Vhen the dog 45 is thus engaged, a printing operation is efi ective, through a train of connections not shown, tolower the feed dog 45 and bring the holding dog 46 into engagement with the rack, and during thereturn movement of the dogs the carriage advances one letter space. is locked in the Fig. 2 position the finger piece 34 co-acting with the carriage release lever 38 holdsthe feed rack 41 disengaged from the normally engaged feed dog 45, as shown; This trees the spring-propelled carriage'trom the restraint of its escapement mechanism and relieves the feed dogs and rack from any injury that might result from shocks or are from the carria e in trans ortin the b 23 machine in its case. Since the carriage is treetrom restraint ofits escapementmechin em at this time, it is desirable to provide other means for holding the carriage. I The center lock, one member of which is formed the locking finger 35, is provided for t1 is purpose. hen the lever 31 is moved to and locked in the Fig. 2 position, as explained, the locking finger 35 is projected down through a slot in the carriage plate 20 and into effective position. In this position the lower edge of thelocking finger 35 has a path of movement with the carriage in the normal line of travel of the latter which will bring it into co-operat-ion with one or the other of two oppositely beveled faces 47 on the upstanding part of a companion spring locking member 48, secured by a, screw 49 to the bottom of the carriage support 27. A locking slot or notch 50 is located be tween the two bevel edges 47 on the locking member 48. When the finger 35 is locked in its projected, Fig. 2, position, and the carriage is moved in either direction to cen ter it in its line or travel, the finger 35 will be seated in the locking notch 50 when said centered position is reached, thus holding the carriage against movement either to right or left. The machine will thus be maintained with the feed rack released and the carriage centerdocked as long as the finger wheel remains in the compacted, full line position, shown in Fig. 1. This condilVhen, however, the lever 31 of the inner frame 2 of the machine.

in Fig. 4.

tions the "machine for enclosure and transportation within its carrying case after the type bars have been collapsed. To recondition the machine for use, it is merely necessary to expand the type bars, as shown in Fig. 2, and pullthefinger wheel 29 to the dotted line position in Fig. 1, thereby freeing the lever .31 and bringing about a release of the center lock and a re-engagement of the feed rack with the feed dog 45. However, it sometimes occurs that the operator in conditioning the machine for use will expand the type bars but will forget to pull out the finger wheel 29 before attempting to write; on the machine. In the Remington Portable machine the printing keys are free to belactuated at this time to cause thetype bars to strike the platen or the paper thereon even though the carriage cannot be moved from its centered position. In accordance with the present invent-ion this objection is overcome by locking the printing keys against actuation until the center lock has been released and. the rack re-engaged with the feed dog 45. This com- ,pels the operator to pull out the finger wheel 29. to efi'ect this result before the printing keys can be actuated. The act of pulling out the finger wheel 29 and producing the above mentioned result is efiective to automatically release the locked printing keys, as will nowappear. 1 V

V The'detail construction thus far described is part of the regular equipment of the Remington Portable machine. In addition said machine is equipped with line lock mechanism coinprising'a locking bar 51 having arms 52 at the ends thereof. These arms have ears 53 3G1f01flt6d. to receivepins 5.4 which project inwardly from the side plates In this manner the locking bar is pivotally mounted to 'swin ioreand-aft of the m..- chine. The lower edge of this bar is bent rearwardly to form a flange 51 which, when the bar is in'locking position shown in Fi 2, extends beneath the forwardly extending bills 55v of the hook-like projectionson the printingkey levers. While the locking bar does not prevent all depressions of the key levers, it does, when in effective position, prevent a full depression of any of the key levers and-prevents a movement of any type bar to printing position. A link 56 extends fore-and-aft of the machine and is connected at one end to a perforated ear 57 on the locking bar, and at the other end to one arm of a bell crank lever 58. This lever is mounted on a bracket arm 59 secured to a fixed part of the machine. j The other arm of the lever 58 is connected to one end of a link 60 that extends transversely of the machine,and at its-other end projects through an opening 61 ina lever 62, shown in detail A nut 63 is received on the inner threaded end portion of the link and bears against one side of the car 64 of the lever 62. A coiled expansion spring 65 surrounds the link 60 and bears at one end against the ear 6%, and at its other end against a nut 66 on the link 60. Motion is transmitted from the lever 62 to the link 60 and the parts controlled thereby through the spring 65. The lever 62 is pivoted at 67 on the carria e support 2? and extends rearwardly of its fulcrum .where it is slotted at 68 to receive a headed screw 69 threaded into a supporting bracket 70, and operating to limit the motion of the lever 62. The rear end of the lever 62 is provided with an off-set arm 71 that terminates in an edge 72, with which the usual adjustable line lock actuating member (not shown) on the carriage co-acts to turn the lever 62 when the carriage reaches the end of a line. This motion is transmitted through the intermediate train of connections to the locking bar 51 to move it to the locking position, shown in Fig. 2. V i

The key locking construction as thus far described constitutes part of the usual line lock equipment of the Remington Portable machine. In accordance with my invention, as shown in the present embodiment thereof, 1 have provided a forwardly extending finger 73 on the outer end of the arm 71, said finger terminating in a rounded contact 74. This contact, as will be seen from an inspection of Fig. 3 is located to one side of avertical fore and-aft plane extending through the body portion of the lever 62 and the pivot 67 thereof. The contact 74 is located, inthe present instance, in the rear of and normally free from-contact with, the plate or feed rack support 40. The feed rack support 40 is provided or formed with a rearwardly extended rounded proturberance, contact, actuating projection, or interponent 75. his contact is located about midway of the rack support and has a path of travel with the carriage which will bring it into alignment or register with the contact 74; when the carriage is centered in its line of travel, and where the center lock is effective to hold the carriage centered. At all other points or letter space positions in the travel of the carriage the contact 75 is out of register with the contact 7%. The construction and arrangement of the parts are such that when the contacts 74 and 75 are out of register the release of the feed rack, by either the release key 38 or the center lock key 34, will be ineffective to actuate the lever 62 and the key lock controlled thereby. When, however, the carriage is centered or in position where the center lock is effective to lock the carriage, the interponent 7 4 will be brought into register with the contact 75. A forward movement of the center lock key 34 at this time is efiective to move the locking finger 35 down into the slot 50, to move the rack support or member 40 rearwardly to disengage the rack from the dog 45, and through the registering contacts 74 and Y5 actuate the member 62 to cause it to turn onits pivot in the direction of the curved arrow in Fig.

3, and to move the locking bar 51 to efie'ctive position. The parts will remain in this condition as long as the feed rack is maintained disengaged from the feed dog 45. When the rack is returned to its normal position to re-engage said dog 45, the lever 62 and the locking bar 51 will be returned to normal position by a returning spring 76 connected to the bell crank lever 58.

By this arrangement'the carriage release key may be actuated at any one of, say, 84 r of the 85 letter space positions of the carriage without actuating the key look, so that characters may be crowded in in the manner hereinbefore described. Yet said key lock will be actuated by 'a throwing out of the feed rack by the center lock key at the only point in the travel of the carriage where the key lock under control ofthe center lock is necessary for the purpose of the present 111- vention;-that is to say, when the carriage is centered in position to be held by the center look, at which time it is also desired to lock the rack released.

From an inspection of Fig. 6, it will'be seen that the'co-acting faces of the contacts 7e and 75 are rounded. It will be under stood therefore that if the operator should actuate the key 8% when the carriage is at either side of its centered position, and run the carriage to such position to center lock it, the following operation will result: An actuation of the key 34 while the carriage is off-centered will not result in actuatingthe key lock. Vhcmhowever, the carriage is moved to its centered position while pressure is maintained on the key 3%, the pro jected contact 7., will act with a camming effect on the contact 74 and actuate the key look just asthe carriage reaches the centered position and the center lock engages.

It will be understood therefore that the oper ation of the key lock by the center lock or the carriage release key 18 dependent-on the position of the carriage in its line of travel and that at only one point in this line can nearest letter space position to the left there of if the insert is in a fractional space position. If the insert is to be made at the exact letter space position in question the operator has merely to operate the desired printing key alter the engagement of the If the insert s to operator in such position with one hand the other hand may actuate the requisite printing key to insert the character to be printed. The backward movement of the carriage to the right referred to above may be efiected either by an end pressure exerted on the carriage or by an operation of the usual back spacing key. It will be understood, however, that it is only when the carriage is at this one point in its line of travel that it is necessary to effect an insert in this manner. At all other points an insert may be effected by a direct movement of the carriage thereto and while the carriage release key is held in its actuated position as previously described. a

From the foregoing it will be understood that whenever the carriage is centered, and the lever 31 is locked inthe Fig. 2 position to release the feed'rack and render the center lock effective, as shown, the printing keys will be locked against printing actuation, even though the type bars be expanded ready for use. Then, however, the finger wheel 29 is pulled out to the dotted line position, this will release the locked lever 31 and it will be returned by its spring 37 to normal position. The effect of this is to release the center lock, returnthc feed'rack to dogengaging position and move thekey locking bar 51 to releasing position, so that the machine is fully conditioned for use, assuming that the type bars have been moved to expanded position. has thus been fully conditioned for use, the type bars cannot be actuated to print on the work sheet.

From the foregoing description it will be 7 understood that by my present invention I have provided, with but slight. change, a construction which embodies a train of operative connections intermediate both finger pieces 34 and 38 and the key lock, and that i such connections include an interponent 7 5 But until the machine that I claim as new and desire to secure by Letters Patent is r 1. In a typewriting or like 'machine, the combination of a carriage, printing keys, a lock for preventing a printing actuation of said keys, a finger piece for actuating said lock to render it effective, and means which render said finger piece effective-to thus actuate saidlock only when the carriage 1s at agiven point in its travel.

2. In a typewriting or like machine, the' combinationof a carriage, printing keys, a lock for preventing a prlntlng actuation of said keys, a finger piece, and means which" render sald finger piece effective to actuatev said lock only when the carriage is centered in its line of travel.

3. In a typewriting or like machine, the combination of a carriage, a center lock for locking the carriage centered in its line of travel, printing keys, a key lock for locking said keys against printing actuation, and means by which the center lock, isrendered efiec'tive to control the key look only when the carriage is centered torender the center lock active.

4. In a typewriting or like machine, the combination of a carriage, escapement mechanism therefor, printing keys, a lock for locking said keys against printingactuation, carriage releasing means for freeing the carriage fnom restraint of the escapement mechanism, and means which enable the carriage releasing means to control said look only when the carriage is at a given point in its travel.

5. In a typewriting or like machine, the

combination of a carriage, escapement mechanism therefor, a center lock for locking the carriage centered in its line of travel, printing keys, a'key lock for lockingsaid keys against printing actuation, means which enable the center lock to free the carriage from restraint of its escapement mechanism, and means. which enable said center lock to control said key lock only when the carriage is centered in its line of travel.

6. In a typewriting or like machine, the combination of a carriage, printing keys, a lock therefor, a finger piece displaceable from normal position for rendering said lock effective, and means dependent on the position of the carriage in its line of travel to determine the'effectiveness orineffectiveness of said displaceable finger piece to actuate said lock to render it effective.

7.*In a typewriting or like machine, the combination of a carriage, printing keys, a lock therefor, a finger piece, and a train of operative connections intermediate said,

finger piece and lock including an interponent moved by the carriage at a given point in the line of travel of the latter to a position that renders the train of conliil) nections effective to transmit movement from said finger p1ece to said lock to actuate it and thereby prevent printing actuation of said keys.

,8; In a typewriting or like machine, the combination of a r" ge, printing keys, alock therefor, 1 piece, and a train of operative connections intermediate said lin er piece and lock including a member carried by the carriage. to travel therewith and receive an independent movement thereon and which is git V uch independent movement by said ling piece, saio member carrying a contact that registers with a coacti member only at given point in the travel of the carriage and only at such point transmits the independent movement of the carriage carried member to its coacting member to actuate the lock.

9. In a typeivriting or like machine, the combination of a carriage, printing keys, a lock therefor, a key carried by the carriage and operative to release it from restraint of its feed mechanism, and means capable of being controlled by said key at only one point in the line of travel of the carriage for actuating said lock.

10. In a typewriting or like machine, the combination of a carriage, cscapement mechanism therefor, a ccnte lock for locking the carriage centered in its line of travel, printing keys, ocking means for locking said keys t printing actuation, a controlling key, and means controlled there by for releasing the carriage from the restraint of its escapement mechanism, for rendering said center lock etlectlve and for actuating said key locking means to pre vent printing actuation of the printing keys, the construction and arrangementof the parts being such to render said controlling key capable of actuating said key locking means at only one point in the travel of the carriage.

11. In typeivriting or like machine, the combination of a carriage, escapement mechanism therefor comprising a releasable rack, which when released frees the carriage from restraint of its escapement mechanism, printing keys, locking means for preventing printing actuation of said keys, and means for actuating said locking means to lock the keys when the rack is released and the carriage is centered in its line of travel but inefiective to actuate the locking means at other points in the travel of the carriage.

12. In typewritin or like machine, the combination of a carriage, escapement mechanism therefor, a center lock for locking the carriage centered in its line of travel, printing keys, locking means for locking said keys against printing actuation, a controlling key, and means controlled thereby for releasing the ce-trria 'e from the restraint of its escapement mechanism, for rendering said center lock effective and for actuating said key locking means to prevent printing actuation of the printing keys, a return movement of said controlling key to normal position restoring the carriage to control of its es capement mechanism, rendering the center lock ineffective and releasing the printing keys from restraint of their locking means, the construction and arrangement of the parts being such that the elfectiveness of the said controlling key to actuate the key. lock is determined by the position of the carriage in its lineyof travel.

13. In a typewriting or like machine, the combination of a carriage, escapement mechanism. therefor including a releasable feed rack for freeing the carriage from restraint of the escapement mechanism, printing keys, andlocking means for said keys operative by the releasing movement of said feed rack only if the carriage is centered in its line of travel.

l i. In a type'ivriting or like machine, the combination of a carriage, escapement mechanism therefor, printing keys, an'da lock for locking said keys against printing actuation including a controlling member carried by the carriage support and a second hand-actuated controlling member carried by the carriage and co-operative with said first mentioned controlling member at only a given point in the travel of the carriage to actuate the lock and also operative at the same time to free the carriage from restraint of its escapement mechanism.

15. In a typewriting or like machine, the combination of a carriage, a center lock for locking the carriage centered in its line of travel, printing keys, a lock for locking said keys against printing actuation, a linger piece carried by and movable on the carriage, and means controlled by said finger piece for rendering said center lock effective and for actuating said key lock to prevent a printing operation of saidkeys, the construction and arrangement of the parts being such that said finger piece is effective on said key lock only when the carriage is centered in its line of travel. 7

16. In a typevvriting or like machine, the combination of a carriage, escapement mechanism therefor, a center lock for locking the carriage centered in its line of travel, printing keys, a lock for locking said keys against printing actuation, a finger piece carried by and movable on the carriage, and means controlled by said finger piece for rendering said center lock effective for actuating said key lock to prevent a printing operation of said keys and for freeing the carriage from restraint of its escapement mechanism, the effectiveness of said linger piece to actuate the key lock depending on the position of the carriage in its line of travel.

17. In a typewriting or like machine, the combination of a carriage, a plate carried by and extending lengthwise 1n the direction of the travel of the carriage and movable independently thereon, means for controlling the independent movement of said plate, escapement mechanism for the carriage, printing keys, a lock for locking said keys against printing actuation, and means that enable the independent movement of said 18. In a typewriting or like machine, the

combination oi a'carriage, a plate carried by and extending lengthwise in the direction of the travel or the carriage and movable thereon, a center lock for locking the carriage centered in its line of travel, printing keys, and key locking means controlled byv said plate only when the carriage is centered in its line of travel.

19. In a typewriting or like machine, the combination of a carriage, a plate carried by and extending lengthwise in the di ection of the travel of the carriage and independently movable thereon, an actuating pro jection at a given point in the length of said plate, escapement mechanism for the carriage releasable to free the carriage from restraint thereof by an independent movement of said plate, a center lock for locking the carriage centered in its line 01 travel, printing keys, and key locking means controlled by said actuating projection.

20. In a typewriting or like machine, the combination of a carriage, a plate carried by and extending lengthwise in the direction of the travel 01": the carriage and movable independently thereon, an actuating projection carried by said plate substantially midwayin the length thereof, escapement mechanism for the carriage including a feed rack carried by said plate and which frees the carriage from restraint of such escapement mechanism by the independent movement of said plate, a center lock for locking the carriage against movement in either direction in its line of travel, printing keys, and key locking means controlled by said actuating projection, whereby a movement of the center lock to effective position is operative to release the carriage from restraint of its escapement mechanism but is operative to render the key lock effective only in the event that the carriage is centered in its line of travel.

21. In a typewriting or like machine, the combination of a carriage, a platen carried thereby, a finger wheel for said platen movable into and out of compact position, a center lock for locking the carriage in its line of travel and which includes a finger piece for moving it to effective position, means by which the finger wheel is prevented from being moved to the compact position when said center lock is inefiective and which retains the center lock efiective when the finger wheel is in compact position, printing keys, a lock therefor, and means for operatively connecting the center lock and key lock only when the carriage is centered in its line of travel so that at this time only is the center lock effective on the key lock.

22. In a typewriting or like machine, the

combination of a carriage, printing keys,

line lock mechanism "for locking said keys against-printing operation when the carriage reaches the end of a line, a center lock for locking the carriage centered in its line of travel, and means by which said center lock is rendered effective to actuate said line lock mechanism only in the event that the carriage is centered in its line of travel, whereby said keys will be maintained locked as long as the center lock is effective and will be released when said center lock is released.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York, this 30th day of October, A. D. 1924.

v CHARLES E. SMITH. Witnesses:

E. M. WELLS, L. NELSON.

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