US1522495A - Typewriting machine - Google Patents

Description

Jan, 13, `i 925.

G. W. CAMPBELL TYPEWRITING MACHINE F'iled Jan. 5l, 1922 w 1 Lil Patented dan. 13, 1925.

UNTED STATES 1,522,495 PATENT OFFICE.;

GEORGE W. CAMPBELL, OF HARTFORD, CONNECTICUT, `ASSIG'N'OR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION 0F DELAWARE.

TYPEWRITING MACHINE.

Application lei January 81, 1922. Serial No. 533,027.

T0 all whom t may concern Be it known that l, GEORGE W. CAMPBELL, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification. 1

The present invention relates to means for locking the carriage of a typewriting machine against movement on the main frame of the machine preliminary to en closure of the machine in a casing; and for releasing the carriage from such locked condition for the performance of the normal functions of the machine.

An object ofthe present invention is the provision of means whereby one and the same movable element may serve both to lock the carriage against movement in letterfeed and return directions, and against caseshifting movement.

Another object of the invention is the provision .of means whereby the carriage may v be -released Afor its normal functions by operation of the usual space-bar.

A further object of the invention is the provision of means whereby the space-bar may be operated independently of the locking device when the latter is in its normal, ineffective position, and when the space-bar is used in typewriting; otherwise expressed, this object of the invention is the provision of means whereby the connections between the space-bar and the locking device are effective only when the carriage is locked. C Other features of the invention are the provision of means for setting the locking device to lock the carriage, independently of the space-bar; the provision of means whereby, when so set, the locking device a'cts automatically to lock the carriage against n movement in letter-feed or return direction when the carriage shall have been moved a 'suilicient distance vin the proper direction; the provision of means where y device, in locking the carriage against movement in letter-feed or return direction, also locks the carriage in lower-'case position; and the provision of means whereby the locking device is nornially held against accidental displacement, in ineffective position, and, when setto lock the c-arriage, is spring-held to the latterv until automatic locking takes place.

the locking Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is perspective View, from the front, of a portion of the mechanism of an `Underwood standard portable typeveriting machine, showing the device of the present invention associated therewith.

Figure 2 is a broken view, in side elevation, partly cross-sectional, showing the locking device, and operating connections there for, in the normal or inoperative position of the same with respect to the platen-carriage.

Figure 3 is a view similar to Figure 2, except that the locking device is shown in operative position.

Referring to the drawings, a platen 10 isl shown revolubly mounted in the usual manner upon a carriage-frame 11 which is mounted to have letter-feed and return movements on a shift-frame 12. For easy movement of the carriage on the shift-frame 12, the former is provided at the `rear with rolls 13 which run on a rail 14 of the shiftframe; and, at the front, a plate 15, which connects the side pieces 16 of the platencarriage below the platen, rides on rolls or balls 17 supported on a runway 18 on the shift-frame. rlhe mechanism for actuating the shift-frame is not shown. rlhe shiftframe, however, has three case-positions which correspond to the three types 19 shown on the type-bar 20 in Figure 1.

The mechanism for controlling the carriage is urged in letter-feed direction b a spring-drum, not shown and its letter-flied movement is controlled in the following well-known manner. 0n the carriage 11 is a rack 21 in mesh with a pinion 22 o-n a stub-shaft 23 ivotally mounted in a bracket 24 in the shi -frame. Fast to the pinion 22 is a ratchet-wheel 25, the rotation of which` is controlled by a fixed dog 26 and a loosevdo'g 27, both on aV dog-rocker 28. So long, therefore, as the rack 21 is in engagement with the pinion 22, the carriage can have only such movement in letter-feed direction asis permitted by the dog-rocker v28 when the latter isA actuated upon operapinion 22 to permit the carriage to be moved f ratchet-wheel. e

shift-frame 12, which carries the dog-rocker.

ykey-lever is provided with a shoulder 31,

adapted, when a key 32 is depressed, to engage and depress a universal bar 33 forming part of al bail 34 fast to a rock-shaft 35v which is mounted in brackets 36 on the main frame 37 Also fast to the rock-shaft 35 is an arm 38 directed rearwardly and then upwardly, and which at its upper end carries a rearwardly-extending arm or pin 39. The pin 39 projects through a slot 4()v in a yoke 41 forming part of the dog-rocker 28. Behind the yoke 41 the pin 39 is provided with a head 42 for engagement with the rear face of the yoke 41. Thedog-rocker 28 is pivotally mounted by means of pivot-pins 43 on ears or brackets on the shiftframe. The upper of these ears orbrackets 44, only, is shown in Figure 1. The dog-rocker is thus adapted to swing in a rhorizontal plane around its vertical pivots 43 to move the dogs in and out 'ofengagement with the The slot 40 permits the to be moved between case-positions kwith respect to the pin or draw-rod 39 on the arm 38, which latter is pivoted lto the main e the path frame. 4

When a type-key is depressed, the universal bar 33 is depressed and the arm 38 rocked forward, to cause the head 42 on pin 39, by engagement with the rear face of the yoke 41, to swing'the dog-rocker 28 around its pivots 43, thus moving the loose dog 27 rearward out of engagement with the ratchet-wheel 25 and bringing the vfixed dog 26 into 'engagement with thetooth ofthe ratchet-wheel previously engaged by the loose dog. A spring 45 attached to the lo'sel dog and to the rocker thereupon throws the loose dog up to position forengagement with the next tooth of the ratchet-wheel; and, when the type-key is released, va leafspring 46, which bears against oneof'the arms of the bail 34, causes the universal bar 33 and key-lever to return to normal position, and also causes the arm 38to"return to normal position, thus permitting the dogi rocker 28 to be swung on .its pivots forward out of engagement with the ratchetwheel, and to bring the loose do 27 into of the succeeding toot on the ratchet-wheel; whereupon the limited movement of the loose dog on its'pivot ermits of a letter-feed movement of the carriage under the tension of the spring-drum.

For eecting 4letter-feed movement of the carriage from the space-bar 47, theN latter is secured by arms 48 to a rock-shaft 49 supported in fixed arms 50 on a cross-piece 51 by al spring, not shown, to move the fixed dog" of the main frame; on which rock-shaft is also xedly secured an arm 52 connected to a link 53, which, in turn, is pivotally connected at 54 to a plate 55 pivoted at 56 onv a bracket 57 o-n the frame piece 37. Fast to, or forming part of, the pivoted plate` is an upwardly-projecting arm 58 oset at 59 to project behind the yoke 41 of the dog-rocker 28. The space-bar and its connections just mentioned lare held in the normal, Figure 1, position by a spring A60 connected to the rock-arm 52 and fixed arm 50 at the front of the frame. Upon depression of the space-bar against the` resistance of the spring 60, however, the link 53 is drawn forward, the plate 55 rocked for ward, and the offset 59 behind the yoke 41' of the dog-rocker thereby swung forward to cause the dog-rocker to swing on its pivots 43 in the same manner as when swung through the operation of a type-key. It vwill he noted that a. sufficient clearance is provided between the boss 42a on the :upper end of the arm 38 in which the pin '39 is mounted and the head 42 on the pin`39 to permit the dog-rocker to be swungY forward when the space-bar is operated without rockingl the arm 38 andthe connections thereto from the universal bar and the typ-bars.

Thusl far the mechanism described is mechanism which has' heretofore been found l in the Underwood standard portable typewriting machine ,and its description here 1s givensimply for a clear understanding of the manner in which the presentinvention, now to be described, is associated therewith for the purpose of locking the carriage against accidental displacement when the casing-is tobe applied. l e

The` locking element of the present invention consists of a finger in the form of an arm 61,v pivotally mounted at 62 on a bracket 63 secured by screws 64 to the under face of the'cross-piece 37 of the main frame, and carrying at its upper end a dog with a detent flange 65 adapted, incertain positions of the platen-carriage, to register with, and "to enter into, a notch or recess 66 in the front edge of the carriage-cross-plate 15. Normally, or in writing position of the parts, position, held forward away from the car-- riage-plate 15b5r means of a leaf-spring 67 `l be secured to the cross-plate. 37 `It w1 noted, lsee Figure 2, that the finger 61 is extended below' its pivot-point 62 to provide a tooth 68 adapted V-shaped pocket""69 formed. by the leafspring 67 .y When it is desired to lock the carriage, piece 70 at the upper end thereof, is pushed forward, causing the tooth 68 to' snap over the inverted V 71 formedj in the end of the spring 67; lso that, as shown in Figure 3, the spring 67 will cause the finger 61 to be the finger 61,-by means of a {ingerthe linger 61 is in the Figure 2 v f to snap in and out;l of a pressed against the front edge ofthe car- I ria-ge-plate 15. If, while the. finger 61 is thus pressed against the carriage-plate 15 by the spring 67, the carriage be moved sufciently far toward central position from` riage against movement tothe r.right or the left.

yAs hereinbefore stated, not only is it desirable. to lock the carriage against movement to the right or to the left, but it is also desirable to lock the 'shift-frame 12 down against movement to middle or upper case-positions, when the casing is to be applied. Such locking of the shift-frame may be effected by thedetent when overlying the shift-'frame 152, as in Figure 3, and also by means of a toe or detent 72 adapted, as shown in Figure. 3, to overlie the front edge of the carriage-plate 15 and act directly on the carriage when the arm 61 is thrown rearward aga-inst said plate 15. Inthe Figure 3 position of the parts, therefore, -the carriage is not only locked against longitudinal ymovement on the machine, but is locked down; and, being thus locked down, holds or locks down the shift-frame reprey sented by the rail 14 on which the carriage runs.

A feature of the invention' has been stated to be ameans for unlocking the carriage and the shift-frame by an operation of the space- Vbar when the machine is to have its normal functions. For effecting such unlocking of the carriage and the shift-frame, the link 53,

- which, it will be remembered, is drawn forward, upon depression of the space-bar, carries a pin 73 which projects laterally across the path of movement of the locking'arm 6'1. When the locking arm 61 is in efective position, see Figure 3, the pin 7 3 is just behind the same. If, therefore, when the parts are in this position, the link 53 is drawn' for# lward by depression of the space-bar, the pin '73 will cause the lockingarm 61 to be` swung forward out of engagementwvith the carriage-plate 15. A This forward, releasing, movement of the'locking arm 6l causes the C tooth 68 at the lower end of the latter to snap into the recess 66 in the spring 67, and

I to be held bythe latter in normal, ineffective,

position;

It will be noted that the connections between the space-bar` and the locking device are such that it is only when the locking device is in'carriage-locking position that the space-bar acts upon the same. This one-way acting connection between the space-bar and the locking device permits the space-bar to have its normal functions'unencumbered by connections to the locking device, and precludes1 actuation of the latter bythe spacebar when the carriage is not to be locked. Variations may be resorted to within the scope of the invention, and portions of the improvements maybe used without others.

` Having thus described my invention, I claim:

1. In a typewriting machine, a platen, a'

` platen carriage movable in letter-feed and return directions, an escapement mechanism t'o control the vletter-feed movement of the carriage, `a space-key and connections therefrom to operatethe escapement mechanism, means for locking the carriage against movement. in letter-feed and return directions, and means 'controlled b yqthe space-key for releasing the carriage-locking means.

2. In a typewriting machine, a platen, a platen carriage movable in letter-feed and return directions, an escapement mechanism to contr l the letter-feed movement of the carriage, a space-key and connections therefrom lto operate the escapement mechanism,

a finger lfor locking the carriage against` movement in ltter-feed and return directions and against case-shift movement, means controlled by the space-key for releasing the carriage-'locking finger, said carriage-locking iinger movablebackward and forward of the machine into and out of engagement with a slotted rail of the carriage when the carriage shall have been moved to 'cause such slot to register with the finger, and a spring for causing the Yfinger to enter the slot when such registration occurs. 'i -3.\In a typewriting machine, a platen, a platen carriage movable'in letter-feed and return directions, and shiftable between case positions, an escapement mechanism to con? Ltrol the letter-feed movement of the carriage, a. space-key and connections therefrom to operate the escapement mechanisn'n means for locking the carriage against case-shifting movement, and means controlled by the spaceakey for releasing the locking means.

4. In a typwriting machine, a platen, a pla-ten carriage movable in letter-feed and Hreturn directions, and shiftable between case lon operate the escapement mechanism, means. for locking the carriage against movement.

letter-feed or return direction, and against case-shifting movement, and means controlled by the space-keyv for releasing the locking means. Y 1

(3. In a typewriting machine, a platen, a platen carriage movable inwletter-feed and return directibns, and shiftable between case positions, an escapement mechanism to 'control the letter-feed movement of the carriage, a space-key and connections therefrom to operate the escapement mechanism, means for locking the carriage against movement in letter-feed or. return direction, and against ,case-shifting movement, and means controlled by the space-key for releasing` the locking means, said locking means comprising a finger having a detent thereon for engagement with'a notchin the carriage and adaptedin part to overlie the carriage Qvhen in effectlve posi/tion.

ln a typewriting machine, a platen, a

Y platen carrlage movable in letter-feed and Cal return directions, a case-shift' frame on which said carriage travels` an escapement mechanism to controlthe letter-feed movevment of the carriage, a space-key and connections therefrom to" operate the escapement'mechanism, means for locking the carriage against movement. in letter-feed or re- (urn direction, -and against case-shifting movement, and means controlled by the space-key for releasing the locking means, ysaid'locking vmeans comprising afinger having a detent thereon for engagement with a notch in the carriage, and a toe or stop adapted in part to overlie the case-shift frame when in effective position. g

8. ln a typewriting machine,A a platen, a platen carriage movable inletter-feedand return directions, and shiftable between case positions, an escapement. mechanism to control the letter-feed movement of the carriage, a space-key and connections therefrom to operate the escapement mechanism, means for locking the carriage against movement in letter-feed or return-direction, and against case-shifting movement, means controlled by the space-ke)Y for releasing the .locking means, said locking means` comprising Aa finger having a detent Athereon for engagement Awith a notch in the carriage and adapted in part to overlie'the carriage when in effcctive position, and means for settingpthe locking means so that the detent will automa-ticallyengage in the notch upon movement of the carriage a sufficient distance in the' proper direction.

9. ln a type-Writing machine, a platen, a platen carriage movable in letter-feed and return directions, a case-shift frame on which said carriage travels, an escapement mechanism to control the letter-feed movement of the carriage, a` space-key and con- Varmagnac nections therefrom to operate the escapement mechanism, means for locking the carriage against movement in letter-feed or return direction, and `against case-shifting movement, l and means controlled by the space-key for releasing' the locking means, said locking means comprising a vfinger having a detent thereon for engagement with a notchvin the carriage, a toe or stop to overlie the carriage,

and a. stop to overlie the case-shiftl frame,

when the finger is in effective position, with f the carriage in lower-case position. A

10. ln a typew-riting machine, a platen, a platen carriagev movable in letter-feed and return directions, and shftable between case positions, an escapement mechanism to control the letter-feed movement of the carriage, a space-.key and connections 'therefrom to voperate the escapement mechanism, means ,for locking the carriage against movement in letter-feed or return direction, and against case-shifting movement, means controlled by the .space-key for releasing the 'locking means, said locking means comprising a finger having a detent thereon for engagement withoa notch inthe carriage and adapted in 'part to overlie the carriage when in effective position', and means for setting the locking means under spring tension so that the detent will automatically engage in the notchupon movement of the carriage a sufficient distance in the proper direction. ,11. In a typewriting machine, a platen, a platen carriage, an escapement mechanism comprising a dog-rocker to cont-rol the letter-feed movement of lthe carriage, a' spacekey, a rod or link, having forward and backward movement, connecting the dog-rocker to the space-key, a device `movable to and from the carriage to lock and release the L latter, and a detent `carried by said rod to engage said locking device to release the carriage when the space-key is depressed.

` 12. In a typewriting machine, a platen, a platen carriage, an escapement mechanism comprising a dog-rocker to control the letter-feed movement of the carriage, a vspace-key, a rod or link, having forward J and backward movement, connecting the dog-rockerto the space-key, a device movable to and-from the carriage to lock and release thevlatter, and a detent carried by said rod to engage said locking device to release the carriagewhen the space-key is depressed; the locking devicebeing free of said detent in locking' operation.

13'. In a typewriting machine, a platen, a platen carriage, an escapementmechanism comprising a dog-rocker to control the, letterfeed movement of the carriage, a space-key, a rod or link, having forward and backward l'novcment, connecting the dog-rocker to the space-key, an arm pivoted to have movement to and from the carriage, a carriagelocking element on said arm, and a pin or.

ISU

lug on said rod projecting across the path` [platen carriage, an escapement mechanism comprising a dog-rocker to control the letterfced movement of the carriage, a space-key, a rod or link, having forward and backward movement, connecting the dog-rocker to the space-key, an arm pivoted to have movement to and from the carriage, a carriage-locking element on said arm, a pin or lng on said rod proJectmg across the path of movement of said arm to strike and .throw the latter to carriage-released position when the space-key is depressed, and means for effecting a setting of said arm whereby the locking element may act antomatically, and independently of said rod, to lock the `carriage when the latter has been moved to desired position.`

15. In a typewriting machine, a platen, a platen carriage shiftable between casepositions, and escapement mechanism comprising a dog-rocker to control the letter-feed movement of the carriage, a space-key, a rod or link, having forward and backward movement, connecting the dog-rocker to the space-key, an arm having a detent thereon for engagement with a notch in the carriage ytolock the latter against movement in letterfeed and return directions, and a toe or stop thereon to overlie in part, and lock, the carriage against case-shift movement, and means on said rod for moving said arm to release the carriage. y

16. In a typewriting machine, a platen` a platen carriage movable in letter-feed and return directions, and shiftable between ease positions, an escapement mecl'ianism to control the letter-feed movement of the carriage, a space-key and connections therefrom to operate the escapement mechanism, means for locking the carriage against caseshifting movement, and means controlled by the space-key for releasing the locking means, said locking means being disconnected from the space-key in its movement to effective position.

17. In a typewriting machine, a platen, a. platen carriage movable in letter-feed and return directions, and shif'table between case position, an escapement mechanism to control the letter-feed movement of the carriage, a space-key and connections therefrom to operate the escapement mechanism, means for locking the carriage against case-shifting movement, and means controlled by the space-key for releasing the locking means, said locking means being also releasable independently of the space-key.

18. In a typewriting machine having a keyboard and a traveling carriage mounted for case-shiftrnovement, a device for locking said carriage against traveling and caseshift movement, and a key in said keyboard for releasing said locking device.

19. In a typewriting machine, the combination with a traveling carriage comprising a bar having a notch therein, of a locking member co-operativc with the notch to lock the carriage stationary in a cent-ral position for shipment, a spring-detent engaging the locking member to detain it in effective or ineffective position, and a cam on the locking member co-operating with .the spring-detent, the cam and detent being so constructed and arranged that the detent urges the locking member toward position to seat in the notch when the locking member is moved against vthe bar with the carriage away from central position.

20. A locking device for use in typewriting machines, comprising an arm pivoted on the machine-frame and having a detentfiange to interfit with a notch on the carriage-rail, a beak to overlie the carriage-rail and hold it down, and a finger-piece for swinging said lever to effective position.

GEORGE W. CAMPBELL.

Witnesses:

L. W. DoBsoN, L. C. GULLBERG.

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