US2341470A - Typewriting machine - Google Patents

Description

Feb. 8, 1944. M. w. NEWB ERRY 2,341,470

' v TYPEWRITING MACHINE 1 Filed April 21. 1942 4 Sheets-Sheet 1 g H \l I a E U H INVENTOR L Alf/6.5 m Mew 5592),

ATTORNEY Feb; s, 1944. M. w. NEWBERRY 2,341,470

' v TYPEWRITING MACHINE Filed April 21, 1942 4 Sheets-Sheet 2 BY &

K ATTORNEY Feb. 8, 1944. M. W. NEWBERRY TYPEWRiTING- MACHINE I Filed April 21, 1942 -4 Sheets-Sheet 3 BY v ATTORNEY Patented Feb. 8, 1944 UNITED STATES PATENT OFFICE,

TYBEW RITING MACHINE Meigs W. Newberry, South Windsor, C0nn., as-

signorto Underwood Elliott Fisher Company, New York, N. 'Y., acorporation of Delaware Appiication April 21, 1942, Serial No. 439,889

' 19 Claims.

This invention relates to key-settable, margingaging mechanisms for typewriting machines, and more particularly to mechanisms of this character having provision for margin release and automatic restoration therefrom for normal line typing.

One of the objects of the invention is to pro vide an improved margin-release device for keycontrolled release ofv the carriage from the normal limits of line-typing to permit typing beyond either margin, and adapted to be automatically reconditioned for gaging the normal typing line limits upon bringing the carriage back within the range of the limits; the improvements being related particularly to margin-gaging mechanisr'ns having key-settable stops uniformthro'ugb out the range of carriagetraveland positioned identically when set for gaging the'margins."

The present invention constitutes mainly an improvement in the margin-gaging mechanism described and claimed in the impending application of Helmond, Serial No. 372,297, filed December 30, 1940. The present improvements afford a more simple structure by eliminating a number of the elements of the earlier mechanism, and otherwise materially simplify the mechanism, without sacrificing any of its practical operating characateristics.

A further improvement over the mechanism shown in said copending application is that of making provision for use of both primary and secondary margin-gaging stops; affording mechanism which. permits of defining two stop positions for the carriage in each direction of travel,

this provision being of practical advantage in 3" typing operations such as involve the indenting or blocking in of the typed matter, paragraphing. marginal numbering of lines, etc.

The improved mechanism, having provision for both primary and secondary margin gaging, further provides means operable at will for rendering the stops for primary margin-gaging ineffective. Thus, the typist may select for continued use at will, either the primary stops gaging a shorter line. or the secondary stops gaging a longer line.

The invention in certain respects constitutes a further improvement on the one described and claimed in the copending application of Helmond, Serial No. 341,420, filed June 20, 1940, now Patent No. 2,316,865, dated April 20, 1943 and is also an improvement on the mechanism shown in the U. S. patent to Dobson No. 2,196,790, dated April 9, 1940.

In the drawings: I

Figure l is a front elevational view of the margin-gaging mechanism of the invention, in

thefcondition of typing a line between prescribed normal margins. 'To facilitate illustration, the view omits certain elements of thestop-restoring mechanisms,

Figure 2 is a sectional view taken on a foreand-aft plane' of the typewriter, showing the margin-stop mechanism in side elevation,

Figure 3 is a' fragmentary exploded perspec tive, as viewed from the rear'of the) machine, showing the counter-stop, the associated'rnarginrelease and restoring mechanism, and the-stopsetting mechanism,

Figures fl, 5, and 6 are fragmentary front. elevations, showing the mechanism in various conditions of operation in releasing from the righthand margin or line end for further typing; Figure 4 being the condition when the carriage is arrested at said margin and the margin-release key is initially depressed; Figuref5, when the release key, has been f ully depressed, and Figure 6, the condition during typing beyond the margin, and

'Figure '7 is a fragmentary elevation of the mechanism as shown in Figure 6 condition but viewed from the rear of the machine.

Referring now to the drawings, and more particularly to Figures 1 and 2, the typewritin ma chine forming the illustrative embodiment of the invention includes a carriage It! having end members H rigidly connectedby means including a cross memberor carriage rail I2. mounting the carriage for line-typing movement on trackways l3 supported on the main irame of the machine. The usual typing instrumentalities may be provided, of which type keys, not shown, are

arranged to actuate type bars- 4 to strike a work sheet on platen 15 on the carriage. The carriage is actuated in the letter-feed direction by-the usual spring drum, not shown, under control of an'escapement mechanism It, wheel I! ofwhich may be reared to the carriage by a pinion l8 and carriage rack I9. The carriage may be advanced stey by step in the conventional manner by the type bars l4 engaging and actuating a'universal bar 23] connected to .a'rockable bail 2llpivctedat 22 and operatively connected at23 to an escapement dog carrier 24"cocperative with the wheel I! in the well-known manner; In consequence of each type-key operation and the resultant type-barstroke, the carriage is advanced aletter space in line-typing direction so; that the type characters are successivelyimprinted in a typing line on the work sheet on the platen.

A series of margin stops 25, which may be organization may be of any suitable arrangement such as that shown in my Patent No. 2,146,821, dated February 14, 1939.

Stop setting The stop to be set is positioned at a setting station just to the left of the counterstop in its normal position, the stop being located at said station by appropriately positioning the carriage in its range of travel. A stop setter 28 has a setting finger 29 overlying-a stop at said station, to set said stop when the setter is actuated by either of two key levers including a left-hand stop-setting key lever 30 and a right-hand stopsetting key lever 3|. Whether set for leftor right-hand margin gaging, the stops are identically positioned, to move in a common path during travel of the carriage. In that only a single counterstop is employed for gaging both the rightand left-hand margins, means is provided by which any one stop being set may be adapted to gage either the n'ghtor left-hand margin, depending on which of the key levers 30, 3| is operated. This is accomplished by causing the counterstop to be positioned at the appropriate side of the stop to be set, preparatory tosetting the stop. This principle of operation in stop setting is described and claimed in the aforesaid application Serial No. 341,420, and, in combination with other features, forms part of the subject matter of the aforesaid application, Serial No. 372,297. Said mechanism is described herein in that it is combined with and forms part of the margin-release and restoring mechanism forming the subject matter of the present invention.

The shifting of the counterstop leftward of the stop-setting stations, preparatory to setting a right-hand or line-end stop, is effected by mechanism including a shift member 33. Adjacent its upper end, the counterstop 21 presents a broad portion 34 slidably retained between two lugs 35 of the shift member. A bracket 36, secured to the rear trackway 3 or other fixed portion of the machine, supports a pivot 31 on which the shift member 33 is pivoted intermediate its ends. The upper end of said shift member provides two laterally projecting lugs 38 which movein a slot of a cover member 39 on a housing 4!! and cooperate'with the ends of said slot to limit the extent of swinging movement of the shift member. The limits of counterstop shifting, determined by limiting the swing of the shift member, are such that a set stop, whether moving leftwardly or rightwardly toward the counterstop, is arrested at the same point. A spring 4| yleldably holds the shift member and, therefore, the counterstop 28 in the rightward position.

Leftwarddisplacement of the counterstop is effected, as aforementioned, by correspondingly on a rod 44 in a comb bar 45, see Figure 2, and are articulated at their rear ends to levers 46, 41, respectively, pivoted at 48 on a bracket 43 held on said comb bar. As shown best in Figure 3, lever 46 is articulated to the stop setter 28 and has a pin 5! projecting beneath lever 47, which lever carries the roller 42.

It will now be seen that when either key lever 30, 3| is actuated, the stop-setting finger 29 is pulled down and sets the stop 25 positioned at the setting station. Actuation of key lever 3% cperates the stop setter directly through lever 46. Actuation of key lever 3| operates lever 41 which engages pin 5|! and thus operates the stop setter 28. When key lever 30 for setting a left-hand stop is actuated, the counterstop remains stationary; that is, its position rightward of the setting station is maintained, so that the stop being set is set at the left side of the counterstop. However, when key lever 3| for setting a right-hand stop is actuated, the resultant movement of roller 42, coacting with cam 43, swings shift member 33 and thus causes the counterstop 21 to be shifted to the left of the setting station before the stop is actually set; so that when the stop is set, it is on the right side of the counterstop 21. In this manner, a stop being set may be adapted to gage either the left-hand or right-hand margin according to which of the key levers 30, 3| is operated.

A yieldable device is provided in the mechanism for setting a right-hand stop, to prevent damage to said mechanism by forceful operation, in the instance where a stop already set is adjacent the counterstop 21 at its left side, thus blocking proper shifting of the counterstop. This. yieldable device is also included in the subject matter described and claimed in the copending application Serial No. 372,297. The device includes a spring 5| which urges lever 41 rightward; that is, in a direction opposite that in which roller 42 tends to move said lever because of the reaction of cam 43 thereon. Lever 41 has an elongate slot 52 cooperating with pivot 48,

' spring 5| tending to keep the leftward end of the slot against said pivot. When key lever 3| is operated and shifting of counterstop 27 is blocked by a set stop 25, as described, shift lever 33 is thus rendered immovable but roller 42 is allowed to ride down cam 43, nevertheless, in that spring 5| yields to allow lever 4'! to shift leftwardly on its pivot. Upon release of key lever 3|, spring 5| causes the elements to return to normal position, Figure 1. Spring 5| is of greater force than spring 4| so that in normal operation spring 4| will yield during actuation of shift lever 33, while spring 5| retains lever 47 in its normal rightward position.

Stop restoring The mechanism for restoring any set stops to ineffective position may be of any known kind. In the embodiment illustrated, a key lever 53 is fulcrumed at its rear end on a bracket 54, see Figure 2', and, intermediate its ends, is articulated to a second lever 55 pivoted at 56 on a bracket 57 and flexibly connected to a stop-restoring member 53. The restoring member 58 is slidably retained in the cover plate 39 and is arranged so that its upper end engages set stops positioned at or adjacent to the setting station. Upon actuation of key lever 53, the restoring member 58 is raised to restore the set stop. A spring 59, Figure 1, restores the mechanism to quiescent condition.

M r i msr mech ism An improved margin release mechanism is herein provided to release the-carriage formovement beyond the margins defined by the set stops. Upon actuation of a margin-release key lever 60, the counterstop 2! is retracted to a position in which it is clear of the set stops Z5 and, thereafter, a holding device is rendered effective to retain the counterstop retracted. When the typing beyond the margin. is completed and the carriage isagain restored to, position for typing between the margins, this carriage movement brings a set stop into coaction with the holding device andcauses the'latter to release the counterstop so that sameresumes its effectiveposition in the path of the set steps.

This holding device comprises mainly a cam 6?. which, as shown best-in Figure 3, is'rotatably mounted on the shiftlever- 33 by-a stud 53..jour naled in abearing t l. Cam 62 has a series of cam faces at its lower portion, that cooperate with a roller-65 carried on the counterstop 2l-to hold the counterstop retractedor release same into the path of the stops 2-5. In the" various phases of operation, the cam 62 mayv assume any one of three positions'in each-of which one of three cam teeth 51; 68, and-'mthereonis projected upwardly substantially in alignment with. the upper end portion of the counterstop, see Figures 1 and 6.

Two detent arms H, 72, acting mainly as a centering device for cam 62, are pivoted on the shift member 33 and-are urged toward each other by a spring it. A pin i on the. cam 62 projects between said arms which, underthe force of spring l3, yieldablyhold the cam in a medial position, Figure 2, with the pin i l-pressed between .ilats at the upper arm ends. When the cam 62- is angularly displaced, either leftwardly or rightwardly to a position defined by engagement of either tooth El, 68 with thecorresponding lug 35, the cam pin it seats in. a notch '65 of the corresponding detent arm, see Figure 7. Under'such condition, the other detentarm acts only to hold the spring is, said arm resting on the bearing 64. The notches l5 are shaped so as to allow pin 14 to move with the cam to displaced position, without tending to re-center the cam after it has been initially displaced from itsmediallposition an appreciable degree.

The margin-release key lever it is pivoted intermediate its ends on the comb bar 41. and is articulated at its rear end to a second lever it pivoted at 48, a pin ll on the second lever engaging the counterstop 2] in a slot 18 thereof. Said counterstop is slidably. retained at its-upper portion, between the lugsttiagainst lateral displacement and, between the restoring member at the front and cam 62 at the rear, against fore-and-aft displacement. As shown in Figure 1, lever it projects through a slot in a side member of the machine main frame and bottoms in said slot in quiescent position, a spring to urging lever l5 and key lever 69 to quiescent position. A spring 35, anchored on the bracket 35, urges counterstop 2'7 upwardly to its normal position projecting into the path of the set stops, in which position the bottom of slot i8 is against pin ll, lever it being at rest against the bottom of the main frame slot.

The mentioned faces of the cam 62 include a medially disposed recess 8i and left and right, oppositely. inclined faces 82, 83. The recess 8| is so spaced from the cam axis 63 as to allow the counterstop to project into the stop path. The inclined faces 82, 83 are spaced farther from the carry. axis so as to hold the. counterstop re: tracted; when the, cam 52 has been swungto either sideu fdts medialposition. A high point. is pro vided between: each cam face, 82,: 83, and the recess ill to=,.function as a, detent for the cam, in cooperation with roller 65.

When the marginn-elease key lever 65] is pressed, theextent of the. resultant retraction of counterstop. 21 is limited by engagement of lever 76 with an, adjustable stop such as a screw T!)- on the mainframe, Figure 1. This retraction, although suflicient. to put. counterstop 2 out of the stop path, does not, however, bring-roller 66 entirely out of recess 8!, for reasons hereinafter made. clear.

Operation of margin release When margin release is desired, the carriage is usually at either margin limit, as defined by the set stops. When the carriage is at its rightward limit or line-start position, the left margin stop is engaged with the counterstop, the latter remaining in its normal position, Figure 1. In releasing the carriage from line-start position, after retracting the counterstop .by pressing key lever til, the carriage is moved further rightward, as is the usual practice, to position same in readiness to begin the typing at the newlinestart. During this additional carriage movement to the new line-start position, the left-hand set stop 25 movesrightwardly past the retracted counterstop. and, enaging the medial tooth ll] of cam 62, causes said cam to be rotated an initial degree. In that roller 65 has been only partlywithdrawn from recess-SI, the high point of the cam face, adjacent said recess now cams the roller further downwardly until said high point is beyond the aXis of said roller. The roller 66, under influence of spring 28, now 00- acts with inclined face 83 0f the cam and causes further cam rotation until the cam tooth 68 engages. the right-hand lug 35. In that stop screw 19 preventsfull withdrawal of the roller 68 from the recess 8i. said roller, after riding over the high point of the cam, will move upwardly with the counterstop 27 under influence of spring and will therefore coact fully with the cam face 83 to complete the cam rotation. In other words, the stop 19 limits counterstop retraction to such an extent that roller 66 cannot be lowered, by the release key lever, below the position thereof shown in Figurefi. The additional movement necessary to allow the high point-of the cam to pass over the roller, is afforded at the pin-and-slot connection ll, 18;

The operation of the mechanism to release from the right-hand or line-end margin is illustrated in Figures 4, 5, and 6. When the carriage is at its leftward; limit, that is, at the normal line end defined by the right-hand margin stop, the

counterstop 2,1, the shift lever 33, and the cam 62'thereon have. been shifted bodily leftward to th position shown in Figure 4, limited by lug 38 having engaged the end of the slot in cover member 39. When the margin release key lever 69 is actuated, counterstop 21 is thus retracted and slides down the set stop 25 with which it is engaged. Just prior to sliding ofi said stop, the condition of the mechanism is that shown in Fig ure; 4, it being noted that the medial cam tooth Til remains in engagement with the stop. As soon as counterstop 21 rides oif the stop, the mechanism assumes the condition shown in Figure 5, that is the counterstop and shiftmember 33 have been swung rightward. bodily by sprin 41 until the other lug 38 engages the opposite end of the slot in cover member 39. During this swinging movement, however, tooth 10 has remained in engagement with the stop, and, therefore, the relative displacement of the cam pivot 63 by the rightward shifting of member 33 has caused cam 62 to be initially rotated to the Figure 5 position. It will be observed that the carriage is now released and typing beyond the line end may now be done. The key lever 60 may now be released in that the counterstop is now held down by the high point of the cam being engaged with the roller. The subsequent typing beyond the normal line end further rotates cam 62, rotation of which is completed to the Figure 6 position by the coaction of roller 66 with the cam face 82, assisted by the detent arms I! 12.

Primary and secondary stops The description of the margin-gaging mechanism, thus far, has been concerned only with two set stops defining, respectively, the line-start and line-end limits of the carriage movement, or the leftand right-hand margins of a normal typing line. For clarity, these stops will now be referred to as primary stops, indicating that they define the first arrest positions of the carriage at either line limit. As aforementioned, the mechanism has provision also for operation of secondary stops which may define second carriage-stop positions beyond each line limit. These primary and secondary stops are indicated in the drawings by numerals 25 and 25", respectively.

It will be noted that during the rotative displacement of the cam 62 occurring as a result of the margin-release operation at either line limit, the corresponding cam tooth Bl, 68 is brought up into the path of the stops where it now serves as the secondary counterstop, as shown in Figure 6. This condition, resulting after release from the left-hand margin or the normal line end, as defined by the right-hand stop 25, is that obtaining when the secondary stop 25 becomes effective. In said view, it will be observed that the stop 25" will come into engagement with tooth 88 and, after the shift member 33 and associated parts have been shifted to the leftward limit, will arrest the carriage at the second line end, corresponding to the position at which the secondary stop 25" has been set.

The operation of the mechanism to render effective the secondary stop 25" set adjacent the other end of the carriage and defining a second line-start position, is substantially similar to that described for the line-end secondary stop. In this instance, however, the shift member 33 and associated parts remain in their normal, rightward position and cam tooth 61 is disposed in the path of the set stops, the cam 62 having been rotated leftwardly, With tooth 68 stopped at lug 35, following margin release from the primary line-start stop 25'.

Restoration from margin release When the carriage is restored to Within the line limits defined by the primary stops 25', the counterstop 2'! is automatically released so that it is again projected into the stop path, between the two primary stops. Assuming the condition shown in Figure 6 to be present, the desired typing beyond the primary stop having been completed, the carriage is now returned to line-start position. During this carriage movement, the primary stop 25', moving rightwardly, comes into Using secondary stops only When it is desired to type a number of successive lines of the greater length defined by the secondary stops 25", the primary stops 25 may be maintained inefiective for as long as desired by locking down the margin release key lever 6! In the present embodiment the key lever is locked down by swinging a cam lever 86 rightward to the dotted position shown in Figure 1, said lever having a cam which cooperates with the key lever 60 to cam and hold the latter in depressed position. The cam lever 86 may be pivotally mounted as at 81 on a comb plate adjacent the keyboard of the machine.

When the margin release key lever 60 is held down, the primary counterstop 21 is held in retracted position, and, therefore, the primary stops 25' will not cause arrest of the carriage at the margins defined thereby, but will move past counterstop 21 and, by cooperating with tooth 10 of cam 62, cause rotation of said cam to bring the corresponding secondary counterstop 61, 68 into the path of the stop 25". In this manner, carriage arrest will occur at the limits of the longer line, as defined by the secondary stops 25". As the carriage travels the longer range, the primary stops 25' merely cause the cam 62 to be intermittently rotated to and from the three positions thereof, the mechanism operating in substantially the same manner as that previously described for the operation during margin release.

When the margin release key lever 60 is unlocked, the primary counterstop 21 will be allowed to return to its effective position unless key lever 60 is released when the carriage is beyond either margin position defined by the primary stop 25, in which case counterstop 21 will be held down momentarily by cam 62 but will be automatically restored as soon as the carriage is moved to within the line length defined by stops 25'. That is, under the stated condition, counterstop 21 will be rendered effective automatically by the mechanism which operates, under this condition, in substantially the same manner as during restoration from margin release.

Linelocking As the carriage approaches the line end, the resultant shifting of the counterstop 2! and shift member 33 leftwardly actuates a line-locking mechanism so that when the carriage is arrested at lin end, the machine is locked against further typing. In the embodiment illustrated, this is accomplished by obstructing movement of the letter-feed universal bar 20, thus blocking full swing of the type bars l4. As best shown in Figures 2 and 3 the rockable bail 2| has an arm 38 secured thereon, which arm vibrates with the bail during each type-bar stroke. A locking lever 89 pivoted intermediate its ends on the bracket 36, Figure 2, is articulated at one end to the counterstop 21, being engaged in a slot thereof. The opposite end of said lever terminates at the arm 88. When the counterstop 21 is in the position shown in Figure l, as'during the usual typing, the locking lever 89 has its forward end to one side of the arm 88; but upon shifting the counterstop incident to arresting the carriage at line end, the lever 89 is moved into position abutting arm 83 and thus obstructs vibration of the universal bar 20. Upon returning the carriage or in operating the margin release, in either case allowing the counterstop 2i and shift member 33 to return to the rightward position, the locking lever is accordingly swung to a position clear of arm 88.

Although in this application there is specifically described one embodiment which the invention may assume in practice, it will be understood that same is shown 'for the purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What is claimed is:

1. In a typewriter having a carriage movable in letter-space increments; a margin-gaging mechanism including a group of uniform stops on the carriage, arranged at slightly spaced intervals and selectively settable to corresponding effective positions in alignment with each other; a first set stop and a second set stop of said group being adapted to determine successive stopping points for the carriage; a first counterstop arranged in relation to the set stops to bar travel of the carriage at the first point; means adapt ed to efiect a change in the relationship between the first counterstop and the first set stop to permit movement of the carriage beyond the first point; a second counterstop arranged in relation to the set stops to permit travel of the carriage; and means, operable during carriage travel beyond the first point, to effect a change in the relationship of said second counterstop and said second set stop to bar travel of the carriage at the second point.

In a typewriter having a carriage movable in letter-space increments; a margin-gaging mechanism including a group of uniform stops on the carriage, arranged at slightly spaced intervals and selectively settabie to corresponding effective positions in alignment with each other; a first set stop and a second set stop of said group being adapted to determine successive stopping points for the carriage; a first counterstop arranged in relation to the set stops to bar travel of the carriage at the first point; means adapted to effect a change in the relationship between the first counterstop and the first set stop to permit movement of the carriage beyond the first point; a second counterstop arranged in relation to the set stops to permit travel of the carriage; and means, operable by the first set stop during carriage travel beyond the first point, to effect a change in the relationship of said second counterstop and said second set stop to bar travel of the carriage at the second point.

3. In a typewriter having a carriage movable in letter-space increments; a margin-gaging mechanism including a first stop and a second stop on the carriage, adapted to determine successive stopping points for the carriage; a first counterstop arranged in relation to the stops to bar travel of the carriage in one direction at the first point; means adapted to effect a change and the first stop to permit travel of the carstop arranged in relation to the stops to permit travel of the carriage; means, operable during the carriage travel beyond the first point, to

maintain the changed relationship of the first counterstop and first stop, and to eifect'a change in the relationship of said second counterstop and the second stop to bar travel of the carriage in the one direction at the second point; the last 'said'means being operable, upon travel of the carriage in an opposite direction past the first point, to restore the original relationships between the first counterstop and the first stopand between the second counterstop and the second stop.

4. In a typewriter having a carriage movable in letter-space increments; a margin-gaging mechanism including a group of uniform stops on the carriage, arranged at slightly spaced intervals and selectively settable to corresponding effective positions in alignmentwith each other; a first set stopand a sec'ond set stop of said group being adapted to determine successive stopping points for the carriage; a first counterstop arranged to engage the first set stop to bar travel of the carriage at a first point; means to render said first counterstop inefiective to permit carriage travel beyond said'first point;"a second counterstop arranged to clear the set stops; and means, actuatable by the first setstop during travel of the carriage beyond the first point, to render said second counterstop effective for engagement by said second set stop to bar carriage travel at the second point.

5. In a typewriter having a carriage movable ,in letter-space increments; a margin-gaging mechanism including a first stop and a second stop on the carriage, adapted to determine successive stopping points for the carriage; a first counterstop arranged to engage the firststop to bar travel of the carriage in one direction at a first point; means to render said first counterstop ineffective to permit carriage travel beyond said first point; a second counterstop arranged to clear'the stops; means, actuatable by the first stop during travel of the carriage beyond the first point, to maintain said first counterstop ineffective and to render said second counter-stop effective for engagement by said second set stop,

to bar carriage travel in the one direction at the second point; the last said means being operable, upon travel of the carriage in an opposite direction past the first point, to render said first counterstop again efiective and condition said second counterstop to again clear the stops.

6. In a typewriter having a reciprocatory carriage; a margin-gaging mechanism including a first stop and a second stop on the carriage, de fining successive stopping points for the carriage; a first counterstop arranged to engage the first stop to bar carriage travel at a first point; a second counterstop arranged to clear the stops; and key-controlled means to disable the first counterstop, and conditionable by the first stop during carriage travel in one direction, to render the second counterstop effective and to hold the first counterstop disabled; said key-controlled means being conditionable by the first stop, during carriage travel in an opposite direction, to disable said second counter-stop and restore said first counterstop for stop-engagement.

7. In a typewriter having a reciprocatory carriage; a margin-gaging mechanism including a first stop and a second stop on the carriage defining successive stopping points for the carriage;

a first counterstop arranged to engage the first stop to bar carriage travel at a first point; a second counterstop arranged to clear the stops; key-controlled means to disable the first counterstop, and conditionable by the first stop during carriage travel in one direction, to render the second counterstop effective and to hold the first counterstop disabled; said key-controlled means being conditionable by the first stop, during carriage travel in an opposite direction, to disable said second counterstop and restore said first counterstop for stop-engagement; means yieldably holding said key-controlled means in nonoperative condition; and means to hold said keycontrolled means in operative condition.

8. In a typewriter carriage, a margin-gaging mechanism including; a first stop and a second stop on the carriage near each end thereof, defining successive stopping points for the carriage during its travel in either direction; a first counterstop arranged for engagement by the two first stops to bar carriage travel in either direction at the first points; key.- controlled means to disable said first counterstop to permit carriage travel beyond one or the other first point; said key-controlled means including secondary counterstop means ineffective to bar carriage travel and conditionable by the first stops during carriage travel beyond either first point to hold said first counterstop disabled and to render said secondary counterstop means effective to engage one or the other second stop depending on the direction of carriage travel, to bar carriage travel at a second point; said keycontrolled means being conditionable by the first stops, during carriage travel back from beyond the first point, to disable said secondary counterstop means and restore said first counterstop for stop-engagement.

9. In a typewriter having a reciprocatory carriage, a margin-gaging mechanism including; a first stop and a second stop on the carriage near each end thereof, defining successive stopping points for the carriage during its travel in either direction; a first counterstop arranged for engagement by the two first stops to bar carriage travel in either direction at the first points; keycontrolled means to disable said first counterstop to permit carriage travel beyond one or the other first points; said key-controlled means including having a reciprocatory secondary counterstop means ineffective to bar carriage travel and conditionable b the first stops during carriage travel beyond either first point to hold said first counterstop disabled and to render said secondary counterstop means ef fective to engage one or the other second stop, depending on the direction of carriage travel; means yieldably holding said key-controlled means in non-operative condition; and means to hold said key-controlled means in operative condition.

10. In a typewriter having a reciprocatory carriage; a margin-gaging mechanism including; a first stop and a second stop on the carriage, defining successive stopping points for the carriage; a first counterstop arranged to engage the first stop to bar carriage travel at a first point; means to disable said first counterstop to permit carriage travel beyond the first point; and a rotatable member actuatable by the first stop and adapted to releasably hold the first counterstop disabled, said rotatable member including a second counterstop position to clear the stops; the arrangement being such that rotation of said member, during carriage travel in one direction beyond the first point, effects holding of the first counterstop disabled and positioning of the second counterstop to engage the second stop, and rotation of said member, during carriage travel in the opposite direction from beyond the first point, efiects release of the first counterstop and return of the second counterstop to stop-clearing position.

11. In a typewriter having a reciprocatory carriage; a margin-gaging mechanism including a first stop and a second stop on the carriage, defining successive stopping points for the carriage; a first counterstop arranged to engage the first stop to bar carriage travel at a first point; means to disable said first counterstop to permit carriage travel beyond the first point; and a rotatable cam actuatable by the first stop and adapted to hold said first counterstop disabled, said cam including a second counterstop positioned to clear the stops; travel of the carriage in one direction beyond the first point causing said cam to hold the first counterstop disabled and to position the second counterstop for engagement by the second stop, and travel of the carriage in the opposite direction from beyond the first point causing release of the first counterstop and return of the second counterstop to stop-clearing position.

12. In a typewriter having a reciprocatory carriage; a margin-gaging mechanism including a first stop and a second stop on the carriage, defining successive stopping points for the carriage; a first counterstop arranged to engage the first stop to bar carriage travel at a first point; means, yieldably held in non-operative condition, to disable said first counterstop to permit carriage travel beyond the first point; and a rotatable member actuatable by the first stop and including means, rendered efiective upon rotating said rotatable member, to hold the first counterstop disabled, said member including a second counterstop positioned to clear the stops; the arrangement being such that travel of the carriage in one direction beyond the first point causes said member to hold the first counterstop disabled and to position the second counterstop for engagement by the second stop; means being provided to hold said disabling means in operated condition, whereby the first counterstop may be held disabled So that the carriage may travel past the first point, to be stopped at the second point.

13. In a typewriter having a carriage movable in letter-space increments; a margin-gaging mechanism including a first stop and a second stop on the carriage, defining successive stopping points for the carriage; a first counterstop urged to position to intercept the first stop to bar carriage travel at a first point; means to retract said counterstop to clear the stops to permit carriage travel beyond the first point; a cam follower on said counterstop; and a rotatable cam cooperable with said follower and having portions engageable by said stops; said cam being adapted, upon being rotated, to hold said counterstop retracted; said cam presenting a second counterstop positioned to clear said stops and adapted to be positioned, upon rotating said cam for holding the first counterstop, to intercept the second stop and thus bar carriage travel at the second point.

14. In a typewriter having a reciprocatory carriage; a margin-gaging mechanism including a first stop and a second stop near each end of the carriage, defining successive stopping points for the carriage during travel in one direction or the other; a first counterstop urged to stop-intercepting position and arranged between said first stops to limit carriage travel in either direction at a first point; means to retract said counterstop to a position clear of the stops to permit carriage travel beyond the first point; a cam follower on said counterstop; and a rotatable cam actuatable by either of said first stops and cooperable With said follower; said cam being adapted, upon being rotated in one direction or the other, depending on the direction of carriage travel, to hold said counterstop retracted; said cam presenting two second counterstops each positioned to clear said stops and adapted to be positioned, upon rotation of said cam in one direction or the other, to intercept one or the other second stop, depending on the direction of carriage travel, and thus bar carriage travel at 'a second point.

15. In a, typewriter having a reciprocatory carriage; a margin-gaging mechanism including a stop on the carriage; a retractable counterstop ed to effective position for intercepting the stop to gage a normal line end of carriag travel; means to retract said counterstop to clear'the stop, to permit carriage travel beyond the normal line end; a cam follower on said counterstop; a rotatable cam having a series of faces on which said follower is seatable, the faces being differently spaced from the cam axis to gage the counterstop at stop-clearing and stop-intercepting positions; said cam being actuatable by the stop during carriage travel in one direction or the other, to rotate the cam to the different counterstop-engaging positions; and means limiting actuation of said counterstop-retracting means substantially to an extent preventing movement of said follower beyond its position for gaging the counterstop at stop-clearing position.

16. In a typewriter having a, reciprocatory carriage; a margin-gaging mechanism including two stops on the carriage, one near each carriage end; a retractable counterstop urged to effective position for interceptin the stops to gage the normal line ends of carriage travel; means to retract said counterstop to clear the stops to permit carriage travel beyond either normal line end; a cam follower on said counterstop; a rotatable cam having a series of faces on which said follower is seatable, including a medial face to gage the counterstop at stop-intercepting position and two offset faces, one at each side of said medial face, for gaging thelcounterstop at a stop-clearin position; said cam being actuable by the stops during carriage travel in one direction or the other to rotate the cam to the different counterstop-gaging positions; means limitin actuation of said counterstopretracting means substantially to an extent preventin movement of said follower beyond its position assumed in gaging the counterstop at stop-clearing position.

17. In a, typewriter having a carriage; a margin-engaging mechanism includinga first stop and a second stop near one carriage end; a first counterstop urged to effective position for intercepting the first stop; means to retract said counterstop to clear the stops; a rotatable. cam having a series of faces cooperable with the counterstop, the faces being offset from each other to gage the counterstop at stop-clearing and stop-intercepting positions and having a, high and v point therebetween; said cam being actuable by the first stop during carriage travel in one direction or the other, to rotate the same to the different counterstop-gaging positions; said cam including a second counterstop arranged to clear the stops when the cam gages the first counterstop at stop-intercepting position, and positioned for interception of the second stop when the cam gages the first counterstop at stop-clearing position; and means limiting actuation of said qounterstop-retracting means substantially to an extent preventing movement of said counterstop beyond its stop-clearing position.

18. In a typewriter having a reciprocatory carriage, a margin-gaging mechanism including; a

' plurality of settable stops arranged at slightly stop to stop-clearing position to permit carriage travel beyond either first point; means mounting the counterstop for shifting in the direction of carriage travel between limits close to each side of the setting station; a member shiftable with the counterstop; a cam actuatable by either of the said first stops and rotatably mounted on said member; said cam, when rotated to a leftward or rightward position incident to carriage travel beyond a first point, being adapted to hold the counterstop in stop clearing position; and normally ineffective second counterstop means on said cam, rendered effective upon rotating said cam incident to the carriage travel beyond a first point, to intercept the corresponding second stop.

19. In a typewriter having a reciprocatory carriage, a margin-gaging mechanism including; a plurality of settable stops arranged at slightly spaced intervals along the carriage; key-actuatable means operable at a station to individually set any of said stops positioned at the station; a first stop and a second stop set near each carriage end defining successive stopping points for the carriage in each direction; a first counterstop arranged for engagement by the two first stops to bar carriage travel at the first points; keyoperable means to move said counterstop to stopclearing position to permit carriage travel beyond either first point; means mounting the counterstop for shifting in the direction of carriage travel between limits close to each side of the setting station; a member shiftable with the v counterstop; a cam actuatable by either of the said first stops and rotatably mounted on said member; said cam, when rotated to a leftward or rightward position incident to carriage travel MEIGS W. NEWBERRY.

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