US1800543A - Typewriting machine - Google Patents

Description

April 14, 1931' A. cs. F KUROWSKI TYPEWRITING MACHINE Filed Dec. 18, 1926 Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE ALFRED G. F. KUROW SKI, OF BROOKLYN, NEW YORK, ASSIGN'OR T UNDERWOOD ELLIOTT FISHER COMPANY, OF NEVT YORK, N. Y., A CORPORATION OF DELAWARE TYPEWRITING MACHINE Application filed December 18, 1926. Serial No. 155,609.

This invention relates to typewriting machines of that class where a platen-lever is operable'to sweep the platen forwardly or rearwardly greater distances than the usual line- 7 spacing mechanism.

This novel device is adapted for application to standard typewriters, and includes an adjustable platen-sweep handle on the platenframe and operatively connected to the platen by means of a pawl which is resiliently held in engagement with a ratchet-wheel. This pawl may be locked in permanent engagement by means of a dog, so that the platen-sweep handle will rock the ratchet-wheel and the platen tlperewith, during the return movement there- 0 7 It is practicable for an operator to first insert a card or a sheet into the machine, at the rear of the platen, and then operate the handle to sweep the platen and work-sheet to the printing line, then type a line of printing, and finally return the handle to the starting point, thereby rolling the platen rearwardly with the typed work-piece, which is carried back out of the machine.

When the handle is restored to its normal position. the locking dog and pawl are released from said ratchet-wheel, and the platen may be rotated freely by the usual platen-knob, or line spaced by the usual linespace mechanism, making it possible to operate the t ewriter for ordinar work such yp y the pawl in its released position and illusas letter writing.

One of the features of this invention is that the locking dog is not only effective to positively lock the pawl in tooth-interlocking position to swing the ratchet-wheel therewith during the return movement of the handle, but is also effective to positively prevent overthrow of the platen when the handle is operated forwardly against a stop.

It will be understood that this device can be used for performing two kinds of special work-sheet feeding work in addition to the regular line-spacing of the worksheet. Moreover, the same equipment can be applied to different machines and perform one kind of work in one machine and another kind in another machine, thus making it unnecessary to carry a stock of two kinds of platen-controlling attachments.

In order that the device may be used for typing a connected series of forms of uniform lengths, the locking dog is provided with a handle whereby it may be automatically released at the end of the forward stroke of the sweep-handle, so that throughout said return stroke thereof the platen will remain stationary, the pawl riding freely back over Figure 3 is a conventional cross-sectional view showing some of the mechanism displaced for the purpose of illustration.

Figure 4 is a diagrammatic view showing the driving pawl in its locked position, so as to carry the platen in forward and return movements of the handle.

Figure 5 1s a d1agrammat1c view showing trates how the handle may be moved back without moving the platen therewith.

This device may be employed for handling cards or singlework-sheets to be inserted at the rear of a platen 10, rotatably mounted in end frames 11 of a platen-frame. A handle 12 is moved forwardly to thereby sweep the '2 work-sheet to the printing line. The handle is pivotally mounted upon a stud 13 fast to a supporting side plate 14: and carries a pawl 15 designed to engage a ratchet-wheel 16 loosely mounted to rotate about the stud 13. The

pawl is mounted upon a screw 17 fast to the handle, and is held in engagement with the teeth of the ratchet-wheel by means of a spring 18 which serves also as a means for operating a locking dog 19 mounted upon the .718 fast were plate 14.

9 "desired. 1 v

handleby mea ns of a pivot-screw 20,. The ratchet-wheel 16isoperative to drive aspurgear 21 and a pinion-22 fast to the 'free end of" a' platen-axle 23;

19 are-held ininefl'ective positionsby means of stop- pins 24 and 25 carried by a stop-plate 26 which is pivotally mounted upon the stud 13 andmay .b'e adj ustalolyv positioned and held y in place by means o-falockingpawl'27, which nori'nalllyengagestheteeth of afi'Xed toothed;

plate 28'and is itself carried by the stoppl'ate v 26ibymeans of a stud 29. The normal or ineffective position of, the handleis shown in Figure Q. "When the handle '12 is pulled for-' wardly'to rotate the platem the pawl is released from the stop 25, andithe "fspr'ingi8. becomeseffective to throw the pawl'into en- 1 'gagement withthe ratchet-wheel; as shown -=in-;Figure 4:,4 The handle is-then i'moved. all

the way forwardly until it; is arrested by ;a stop or rod 30.? This determines the position 7 of the 1 card at the printing line, and, 7 after typing, the-handle may be moved backwardly to its normal position, thereby ejecting the card. It is the variableirelation between the stationary stop-pin" 30 andlthe adjustable carrier-plate 26' and itsIpinS that definitely determines the handle throw and-platen-rotation, Thenumberofline-spaces that'the platen is rotated during' va' complet e mo'vement' of the handle i'sindicated'by a gradu- -:ated scale 31 whichlco-o'perates with aninj j dex 32se'cured on the stop-plate26. The scale j: On the other hand,'in order that this dei vice may'be'used for the handling or contin-' H nous "forms which requirethe feeding of? the V platen forwardly a ,predetermined'uniform number of line-spaces, the locking dog 19 is provided with a handle '33 which 7 serves as a means for disengaging"the dog. from the: iawlto'thereby permit 'a sliding return-mov inent of. the pawl over the ratchet teeth durin the return movement of the handle. This.

condition'is illustrated in Figure 5, i'nwhich 1' it will-be: oticedthatthe locking dog'is'held against '-a-pin:3't by means of the thumb while or the handle'iscontrolledby the otherfingersi jof thehandf j'lhe handle is held its-inef fectivei position by means 'of-a s'pring 351611 circlinga spring-drum "36 carried a I handle-hub or 'sjleevejs'r. one end ofthe spring is secured' to the drum bylmeans' of a -pin i38 l The other'end of the spring is .an-v

choredon a pirr 39 jcarried by the plate'll.

' Thehandleg l2 is5-offcourse,'operativeinde pendently byits I grip or finger piece 49, with out engaging ifinger piecejfifi except When This advice'i's preferably made theiforin I of an att'achment to astaudard typewri.ter {11o thi'sflendfand'to the end-that the device mayi be 'lca'rried in stoek'as a unit, all the- Inechanism is permanentlytassembled and released position? varlatlons may adjusted between the plate 14 and the toothed plate 28 which iplates are held together by means of a tie-rod 40 and the stopwith an extension 41 which servesa's a bearingfor a short shaft 42; The latter carries side of the plate28 so that when a screw 46 [which securesthe pinion 22 to the platenvaxle is loosened the pinion and the finger; iwheel Inay be takenofithe platen-shaft of the machine together with the other mechanism; '-It will 1 be particularly notedfthat I 7 rod 30. Thetoothed plate 28is provided v jNorinally the pawl 15' and the lockingdog there is also-disclosed-a factory assembled' and; factory adjusted, self contained, plfatendriving mechanism attachable ias an 'assem bled unit to'any Underwoodtypewriting machine; that the ,footi47 of one side plate 14L may be attached to the carriage by two displaceable screws 48 entering factory threa'dr ed holes inthe carriage-end'll, andthehub U of thepinion 22 engaging the. short =p'roje'cting end of the platen-shaft 23 by' thefsc'rew 46 becomes a coupling effective to axially connect the original platen-shaft 231 with the auxiliary shaft li and lengthen the original Q platen-shaft, so that the platen may be driven by the pinion22 or rotated by the fingerwheel 43; that the lengthening of the platen- ,shaft 23' the means providedin the at- 'taohment, removes the necessity for replae' ing the original platen-shaft by-a'neirv. and longer one piecef shaftfandwhich displacement is] especially objectionable where the platen 'i s providedwith a factory 7 assembled frictionalflline-spacing mechanism; and that; 1

V the operating handle '12jcarriesiaTone-way "platen-driving pawl 7 15 and further a eas a manually-operated pawl-controlling trip 19' effective" to] render the one-way driving fserting and a paper-ejecting operationio'r'to rotate the platen forwardly :foria p-aper-in pawl effective to rotate the platen" forwardly v sertingoper'ation only, and-permit theipawlr 15 to drag idly" over, the; platen-driving toothediwheel 16', back to aq-norinal-iplatenbe resorted to' within the l s'copeof the. invention, and portions of the I claim: w-i

1'. a platen-sweeping mecllanism for 'feedinga work-sheet into a 'typewriting ma improvements maybe used without others; 1

i Having thus described. my invention, f

chine, theicombination with a pinion on the an operating lever; and'ja pawl on said Javelndrnially "disengaged; from said ,ratchet- V platen-shaft a gear in,traintofdriveg said ,pln on, a ratchetrwheel, to drive saidge'aig' ratchet-wheel and rotate said platen-shaft, of pawl-locking means" mounted upon said operating lever and rendered effective by the release of said pawl to lock said pawl in engagement with the ratchet-wheel, and a spring connecting said pawl with its locking means and effective to throw the pawl into engagement with the ratchet-wheel and throw the locking means into interlock with the pawl, said locking means also having a pawl-releasing device manually operable at the end of the forward sheet-feeding movement of the platen to forcibly release the locked pawl and allow the operating lever to be returned to normal position, and independently of the platen.

2. In a platen-sweep mechanism attachable as a preassembled unit of mechanism to one carriage-end and to the projecting end of a platen-shaft without disassembly of the unit, said unit including a pair of spacedapart side plates, one plate secured to the carriage-end with replaceable screws, the other plate forming a bearing for an extension-shaft maintained in said hearing between a coupling connectible to the platenshaft end and a finger-wheel, said coupling formed with a pinion to be driven by a train of connected mechanisms, including a piniondriving multiplying gear, a toothed wheel for driving said gear, an operating handle, a oneway pawl on said handle spring-pressed in the direction of the toothed-wheel, a backstop rockably mounted upon the axis of the handle and operative to disable the pawl at normal position against its spring, mechanism operable to set the back-stop to predetermine the extent of platen-rotation to a fixed stop on the frame, a drum fixed to rotate with the handle, a spring having one end fixed to the drum and the other end fixed to the frame and assembled under a tension operative to restore the operating handle to its normal pawl disabling position when re leased by the handle after a forward platen sweeping operation, and means pivotally mounted upon the operating handle and spring-pressed into co-operation with the one-way pawl to render the pawl effective as a locked-up two-way pawl to drive the toothed-wheel forward and back to rotate the platen in two directions, said means being engageable with the same back-stop and jointly disabled with the pawl at the normal position of the operating handle.

3. In a platen-sweep mechanismattachable as a preassembled unit of mechanism to one carriage-end and to the projecting end of a platen-shaft without disassembly of the unit, said unit including a pair of spaced-apart side plates, one plate secured to the carriage-end with replaceable screws, the other plate forming a bearing for an extension-shaft maintained in said baring between a coupling connectible to the platen-shaft end and a finger-wheel, said coupling formed with a pinion to be driven by a train of connected mechanisms, including a pinion-driving multiplying gear, a toothed-wheel for driving said gear, an operating handle, a one-way pawl on said handle spring-pressed in the direction of the toothed-wheel, a back-stop rockably mounted upon the axis of the handle and operative to disable the pawl at normal position against its spring, mechanism operable to set the back-stop to predetermine the extent of platen-rotation to a fixed stop on the frame, a drum fixed to rotate with the handle, a spring having one end fixed to the drum and the other end fixed to the frame and assembled under a tension operative to restore the operating handle to its normal pawl-disabling position when released by the hand after a forward platen-sweeping operation, and means pivotally mounted upon the operating handle and spring-pressed into co-operation with the one-way pawl to render the pawl effective as a locked-up two-way pawl to drive thetoothed-wheel forward and back to rotate the platen in two directions, said means being engageable with the same back-stop and oint- 1y disabled with the pawl at the normal position of the operating handle, said means also including a disabling arm operative to release the locked-up pawl at the end of the forward stroke of the handle to provide an idling sweep of the pawl to its back-stop position. ALFRED G. F. KUROWSKI.

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