US1864540A - Typewriting machine - Google Patents

Description

June 28, 1932. w F HELMQND 1,864,540.

TYPEWRITING MACHINE Filed Aug. 5, 1929 22 47 I? W W Wye/7f:

Patented June 28, 1932 usu'rss STATE PATENTWOFFICE ILLIAM F. Harmonia; or weer iienrronn, oonnnc'rrcn'r; ASSIGNOR ro 'nnminwoon ELLIOTT rrsnnn COMPANY, OFNEW YGR-K, n. Y., A conronnrron or DELAWARE Tyres/ermine MACHINE Application filed August 5, 1929. Serial 1%.3833584.

This invention relates to the carriagemechanism of typewrit ng machines. The

carriage is under control of the space-key typing.

The invention is illustrated as a plied to Underwood typewriting machines. In these .machines the type-key-levers have hooks which co-operate with a transverse rod, to lock-the keyswhen the rod is positioned beneath the hooks by the action of a lever which is-moved by the paper-carriage.

Some of the aims of the invention are to improve the construction and mounting of the lockingrod, and its connection with the carriage-vibrated lever. The locking rod is verylight, and liable to yield under the downward pressure of the keys. It has been the practice to strengthen the rod-strum ture byadding a rock-shaft, from which rise arms that carry the locking rod. By means of the, presentimprovements, however, the lower rod or rock-shaft is eliminated, and

the device ismuch simplified and its cost reduced. ;A novel support for the middle of the locking rod is provided, said support not being attached to the rod, but being secured to a rock-shaft which extends across the base of the typewriter below the key-levers. It is in the form of an idle arm which is secured to said rock-shaft and rises to a point just below the key-locking rod, tofurnish support to the latter when it is pressed down by a key. =Th-elo-cking-rod device consists simply of two arms that are pivoted at their lower ends upon studs projecting from the inner sides of the typewriter-base, and that V i carry said rod at their upper ends. The rod with its arms may be fastened together, forming a bail, which maybe inserted as a unit F studs.

in the machine by springing the rod sufficiently to permit the arms to snap upon the Another the provision of an adjustable operating lug upon the left-hand lock-rodbail-arin, this operating lug. being bent up from the left- .hand bail-arm in, position to be engaged by feature of the invention lies in the tappet which is provided onthelo wer end of the carriage-operated lever. Animproved adjustable. stop is provided for engagement by the right-hand bail-arm.

l Vith a view to adapting the machine for the use of'the aforesaid carriage-supporting idle arm, changes have been made in the mounting of the space] bar or key, which extends alongithe front of the keyboard. The ends of the space-loar are remounted upon two shortened arms which are fixedupon said transverse horizontal rock-shaft lying beneath the line-locking rod. The idle arm or supporting standard on said rock-shaft is provided with a stud, which is connected by a rearwardly-extending link to means for operating the carriage-feeding dog-rocker. The link pulls'the dog-rocker forward, thus effecting an improvement over the usual practice in Underwood machines, .of pushing the dog-rocker from beneath'by means of a long lever of weak construction, and subject to springing and rebounding, and hence apt to re-operate, the dog-rocker devices and effect-double spacing of the car-- riage and work-sheet. By u'singthe novel uprightarmand the" rearwardly-extending link, flexibility is eliminated, and there is no springiness, nor rebounding, 'nor double action of the spacing dogs; while the spacekey touch is very much lightened, The space-key rock-shaft is of heavy construction, and affords a firm support for the keylocking rod, preventing the latter from yield- Thus a substantial key-lever lock-support .is provided that practically costs nothing nd is very eiiicient and not liable to get out of order. a M

Difficulty has been. found with key-locking mechanism, that it is. troublesome. to locate properly in the machine, and apt to i become dislocated and fail to operate. The present key-locking bail is set positively upon locating studs, and cannot be dislocated, and

reliable and durable.

The space-key and spring, and said upstanding idlesupporting arm, are all made as a unit,and assembled I uponfstuds that-extend inwardly from the base; one end of the rock-shaft having abore i 3 a5 its rock-shaft and l iii/ that fits'upon one stud, and the other end of the rock-shaft having a socket extending therefrom and having its end provided with a sma-ll bore to fit upon the other stud. The socket is secured by a set-screw. Vhen loosened, it may be pushed along the shaft,

while the other end of the shaft'is placed upon its stud; whereupon the socket may be thrustoutand placed upon its studand fas- 10 tened-fon the shaft by the screw.

Other features and advantages will hereinafter appear.

In the accompanying drawing,

Figure l is a sectional sideelevation showing the rear portion of the train from the space-key to the typewriter-carriage. Figure2 is a perspective part-sectional view'of-fan Underwood typewriting machine having the present improvements applied "thereto.

Figure 3 is a front-sectional elevation showing the "space-key rook-shaft and the overlying key-locking rod.

Figure 4 sh-ows'the manner of supporting the key-looking rod by means of the standard rising from the spacekey rock-shaft.

Figure 5 is a perspective of the left-hand "endof'the -key-locking frame, showing its bendable operating arm.

In an "Underwood machine, keys are "mounted upon' levers 11 forming parts of trains which operate type-bars'l2 to strike "aplaten l3 mounte'd'upona carriage 14, having a rack-15rmeshing with a pinion 16 to drive 'an'escapement-wheel'17 that "is 'controlled byppacing dogs -1'8,-the latter being mounted upona dog-rocker 19 having a pendent operating arm 20.

Along the front of the keyboardextends a horizontal space bar or 'key'21, fixed-upon latter'exten'ding forwardly from a heavy ftransverse horizontal rockeshaft 23, which is "mounted upon pivot-studs 24 having stems 25 whichare'threaded'into'the sides 26, 27 of "the.typewriterabase Fixed uponthe rock-shaft 23 'is an upright'arm 28 having a'stud 29 that works in a key-*hole-slot 30 formed' in the forward end of a rearwardly-extending link'31, the latter provided at" itsrear end,'at 32, with--a pivota l'fitting 33, intowhich is' threaded the shank 34 of a screw having a head 35, which *s'ervesj as'a hook to operate the pendent arm 5 "20 and" the dog-rocker. The fitting 33 and screw 34" are relatively adjustable: for lengthnin'gor shorteningthe space-key train. The screw 34 slides'in' amount 36, which is threadea through an arm 37 provided upona stautionar'y'frame 38, which carries the dogrocker and the escapement-wheel. Y This I fji e st the initialstroke of'the dog-rockeryand ..this stopmay'be ad usted forwardly or backwardly and secured by a set-screw 40.

'theforward endsof shortenedlevers 22, the r The downward stroke of the space-key is arrested by a stop 41 projecting from the front cross-bar 42 of the typewriter-base. The space-key is returned by a spring 43 and arrested by a stop 44, which is supported on the space-key and catches under an overhanging flange "45 provided upon said crossbar 42.

Line-locking hooks 46, providedupon keylevers, normally clear a lockingbar47. When the line of typing is about done, a lug 48 on the paper-carriage engages a cam 49 and depresses the same, thereby rocking a. transversexrock-shaft 50, from which depends a lever 51. This lever moves the line-locking rod 47 forwardly beneath the key-lever hooks 46, locking the keys. Upon the :bottom :of said lever 51 is carried for this purpose :a tappet 52, which engagesa lug 53 bent out from a left-hand=arm 54 of the locking rod bail; the other-end of-said bail being lfastoned upon a companion arm 55. saidaarms are pivoted upon studs 56, which project inwardly from the opposite side walls 26 and 27 of the base. The tappet 52 strikes the lug 53 and swings the rod 47 forwardly" beneath the locking hooks. The lug '53 is adjustable by bending'forward'ly or backwardly, totsecure proper co-operation between t he carriage-l-u'g48 -and the locking rod47.

The lug 53 is made in one piece with the arm 54, by using a suitable blank iii-which the lug portion ha-s an L form,xas seen'atFigure 5,'the L being bent upwardly at v58, ISO that the long ar-m ofthe-lug extends upwardly alongside of'thearm 54 and can-conveniently be bent forwardly or backwardly. The

arm-55 is provided with a leaf=spring 5.9 to bear against a-wall ofthe front corner post of-the typewriter-frame. Said arm is formed with an upward finger '61 to rest agai-nsta stop '62 in the form ofan extension from a bracket -63, the latter formingpart of the bichrome-ribbon mechanism.

The stop-62 may be bent forwardl-yor backwardly to determine the normal position for the rod 47. Said rod'47, together with its arms and their appurtenances, may be formed as a'unit,-and sprung in place on-the studs 56, as indicated by the dot-and-dash lines, Figure 3; the rodbeing bowed upwardly and the lower ends of the'arms made to converge between said longitudinal studs,

the arms then snappingoutwardly into place thereon. V

Thetappet 52011 the end oflever 51 strikes a cam 64 that is provided upon arbell-striker 65, to raise the striking end 66 of the same said ta-ppet 52 bein pivoted at.67" to permit return of the lever 51 without operating-the bell-striker. imount"36has at its rear end a stop '39, to aring rod" 47,*the rock-arm 28 is exten'ded up- 'wardly at-68'and' formed with'gahead 69-that extends forwardly and irearwardly beneath To aifordasupport for the 'weak key-lock the rod 47, its top edge being concentric with the shaft 23. There is a slight clearance between the edge of head 69 and the rod 47, and the head 69 moves forwardly and backwardly in idleness at the operations of the spacekey; but said head is always in position to intercept and support the rod 47, so that it cannot be bent down by the pressure of the hooks upon the key-levers, Figure 4.

A manufacturing unitis formed by the space-key 21, arms 22, shaft 23, arm 28*and spring 43, which may be assembled and then inserted bodily into the machine. At its lefthand end the shaft is made under length, and a movable extension in the .form of a socket 70 is slipped upon the end of the shaft. This socket has a bore in its closed end, to fit upon the left-hand stud 24. The socket is slid to the right to afford clearance to ermit the shaft to be placed upon the righthand stud 24. Then the socket is slipped to the left to mount it upon the left-hand stud 24, whereupon a set-screw 71 may fasten the j socket to the rock-shaft.

Variations maybe resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim: V

1; In a typewriting machine having a carriage, a feeding mechanism therefor, a system of type-key-levers provided with hooks, and a rock-shaft extending across the system of key-levers beneath the same and having forwardly-extending arms and a space-bar mounted upon said arms, the combination of a light rod extending across the system of key-levers and over the same to cooperate with said hooks to lock the keys, and having arms fixed to the ends thereof pivotally supported by the frame of the machine, a support on said rock-shaft and independent of said rod to project up between the key-levers for supporting the middle portion of the keylever-locking rod, the middle support clearing said rod when rocked by the shaftbut intercepting the rod when it is sprung down by a locked key-lever, and a connection with the carriage-feeding mechanism including a stud on said middle support and a link connecting the stud with the carriage-feeding mechanism.

2. In a type-writing machine having a traveling carriage, a system of type-keylevers provided with hooks, a space-bar having a supporting rock-shaft extending across the system of key-levers and beneath the same, a light rod'independent of said shaft and extending across and over the key-levers and rockably supported at each end by the frame of the machine, and means operated by r the travel of the carriage to rock the rod into co-operation with the hooks, to prevent the depression of the keys, the combination of means mounted upon said shaft to support the middle section of the key-lever-locking rod when said means-is rocked; by thespacethe same, a light rod independent of said shaft and extending across and over the key-levers and rockablysupportedat each end upon the frame of the machine, and means operated by the carriage to rock the rod intoco-operation with the hooks to prevent the depression of the keys, the combination of means mount= ed upon said rock-shaft to'support the middle section of'said rod, to preventzthe-springing thereof to feed the carriage when any carriage-locked key is depressed,

4. In a typewriting machine having a carriage, carriage-feeding. dogs,'.a system -'of type-key-levers to operatesaid dogs and pro? vided withlhooks, a shaft extending across the system of keys-levers beneath the same and rockably'supported at each end by the frame of the machine, said shaft having forwardlyextending arms with a space-bar mounted thereon to rock said shaft, and a light rod independent of the shaft'and extending across the system of key-levers to co-operate with said hooks to lock the key-levers, and 'sup ported at each end by arms pivoted to the frame of the machine, the combination of a support for said key-lever-locking rod, said too support mounted on said shaft to project up v between the key-levers and support the middle portion of said rod without interfering with the rocking thereof by the shaft, but preventingthe springing of the rod by the depression of the locked keys, and a link intermediate the middle support and the dogs, operable to feed the carriage independently of the key-levers when said levers are locked by said locking rod.

5. In a typewriting machine having a car- 'riage, a carriage-feeding mechanism, a sys-' tem of type-key-levers to operate said feeding mechanism and provided with hooks, a spacebar having a supporting rock-shaft extending across the system of key-levers andbeneath the same, a light rod independent of said shaft and extending across and over the key-levers and rockably supported at each end upon the frame of the machine, and means operated by the carriage to rock the rod into eo-operation with the hooks to prevent the depression of the keys, the combination of means mounted upon said rock-shaft riage when anycarriage-lockedkey is depressed, the locking means including an arm risingrfnom said shaft toapass; between the key levers and under saidnod'. i

6; Inatypewriting)machine having a carriage, a carriage-feeding,mechanisrn asys tem of typea-key levers to operate said feeding meehanisni and: provided=with hooks, a space bar having a supporting. rock-shaft extendiing: across the' system of key'-levers; and beneat-h the. same, alight red independent of said shaft and extending across and over-the key-levers and rockably supported at eachend upon the: frame of the machine; and means operated by the carriage to'rockthe rod: into cooperationwith the:- hooks to prevent the depression-"ofthe keys the combination of means mounted upon said; rock-shaft'to sup port the middle; section ofi said rod; to prevent the springing thereof to; feed the carriage: when: any 'carriage locked key is depressed; the locking means: including an arm rising from said shaft to pass between the key-levers: andunder said rod; said arm havingaone-way connection tosoperatethe car riage-feed-inm mechanismnby the depression ofthe space:- arwithout removing the middle: support from: the key-locking rod.

' WlLLlAMo F. HELMOND.

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