US1606999A - Paper-feed mechanism for typewriters - Google Patents

Description

Nov. 16 1926. 1,606,999

o. A. HOKANSON PAPER FEED MECHANISM FOR TYPEWRITERS 1,606,999 o. A. HoKANsoN 'PAPER FEED 'MECHANISM FOR TYPEWRITERS Filed AugsiI :5, 1926 v nation and arrangement of parts shown in n sr rl OTTO A. HoKANsoN, or 4vvoonsrooi, ILLiNois,flAs'sreNoa fro wo'onsfrocr TYPE- WRITERCOMPANY, or Woonsrocfinsmeren con-reafirma criminels. y

PAPER-FEED ivrncnAnrs-M non rrnwarrnns.

Application led August v3, v1926. lserial No. 126,904.

This invention relates to mechanism co` voperating with the plate of` a typewriter for facilitating feeding of the paper'thereon and has for-'its object the provision of such mechanism n which is adapted to various lengths of Vtypewriter platens, including those of eXtra lengths, and which shall be of 'improved construction and convenient and efficient in operation. l

The invention is exemplified in the combit-he accompanying drawings and,` described in the following specification,l and it is more particularly pointed out in the appended claims. c f C i 4 In the drawingsN g Fig. `l'is a fragmentary top plan view of a portion of a typewriter .carriage having one Y embodiment ofthe present 'invention applied thereto; y Q Y, f Fig. 2 is a verticalsection on line 21-2 of y Fig. 1;

Fig. 3 is a top plan View ofthe paper feeding rollersand mountings therefor with parts removed; i y i F'g. 4 is a'vertical section substantially lon line4-4ofFig. 3; and 'L Fig. 5 is a vertical section taken substan tially on lline 5-5 of Fig.V 3but showing parts ofjthe mechanismpnoti'llustrated'in thatfigure,l i v.

In the embodiment of the invention illustrated, the numeral designatesa typewriter nplaten -journaled inV end platesv v11 which are connected by links l12 to theplaten carriageiframe 13, the links l2 permitting vertical casel shift movement of the platen. The carriage is mounted on the usual rune ways* 14 having rollerb'e'arings 15. A shaft 16Ais carried by 'the plates l1 andisfiXed against yrotation therein.- Brackets 17 are,v

fixed upon the shaft 16 and thereon by screws 18. y Y

Adjusting-screwsl) are threaded in projections 2Q on .the brackets `17 and support compression springs 21 which supply resilient pressure Yfor holding feed rollers 22 and 23 against the platen :10.Y The feed held in place rollers 22l and 23-are supported at the ends` ofthe'rocker arms24which are journaled at 25 on arms 26 projecting forwardly from a shaft27. The shaft 27 is journaled in `the end plates 11 and the arms. 26 areprovided withv spaced perforated ears 28 and 29 'for `receivin'g the v.Shaft .27. The .bearing years 28 and 29 are connected .by va bridging member `30 bent over from the ear 29 which is ing face 31 than the unopened portion of the Y perforations in the years 28 and 29 so that a slight angular play `of the arms 26 on the shaft 27 ispermitted.

. Theupper ends of the springs 21 engage y lateralv projections33V on the arms 26 and vpress the arms upwardly to hold the rollers 22 and 23 against the platen 10. vThe arms 26fare held; against movementalong the shaft 27 by screws 34 threaded into the shaft 27 and having heads of a sufficient diameter to substantially fill the space -between the ears 28and 29. f

Any 4desired number of pairs canbe employed, dependingfupon theV length of the platen.l The rollers y'22v and 23 are provided' with pintles 35 at theirv ends which enter pivotalopenings' in the rocker arms 24 to permit rotation of the rollers. The rocker arms24 are spaced from one another by ,spacing bars 36 having pintles 37 at the ends thereof which` formV pivotal. supports for the rocker arms 24 and which extend through openings'in the supporting arms 26,. The brackets 1'7v atl intermediate pointson theshaft are made double, as shown :in-Fig.

3,; and provided with two sets of projections 20, .one for each larm 26 .supportingadjacent ends of-contiguous feed irollers.l The- When itis desired to free the platen from n theV pressure of the feed rollers the shaft 27 is partially rotated. lin 'a counter-clockwise y direction, as viewedin Fig. 5. rllhis move- `of arms 26 ment of the. shaft is'secured by a lever 38,

Fig. l2, which is pivoted at y39 on the plate 11 and which carries aflinkv 40 connected with an arm 41 secured'to the shaft 27.v

A pin 42 cooperates with a slot 43'in the' lever 38 tolimitJthev movement of thelever.

W'hen'the leverY 38 is moved to its eXtremeV forward position the pivotal connection 44':-

betweeiithe:` link land lever4 40 will'p'ass the' vcompress the springs 2l and -free therplaten -frointhe 4feed rollers.

kThe slight lost inotion 'between the shaft 27 and the arms 26 Y willperniit the rollers to adjust themselves relatively to one another so that each' set of rollers is subjected to its ownV springs and no roller'is heldout ofy Contact with the platen due to any. inequality inthe platenvitself' orthe inountings for the feed rollers. The pressure ofthe rollers can be adjusted asdesired by the screws 19. The shaft 27 may be held against bending intermediateits length by braces 45 connected with the brackets 17 by the 'screws 18.

A defies-tor plate 46 s-supported beneath. the platen l0 for guiding the lower edge of the paper aroundthe platen, This plate is: carriedby arms 47 which are mounted on the shaft 27 by means of perforatedears 48 and screws 49n in a manner similar to the arms 26. rllherarms 47 are freely rotatable upon the shaft 27 and are not constrained to more therewith as are the arms Y 26. Ears 50 on the lower face of the plate are pivoted at 5i on the ends of the.

arms 47. Springs 52 surround the shaft 27 and bear upon screws 53 threaded in the projections 2O for adjusting the pressure of the vdeflector plate against the platen. The springs 52 are provided with laterally bent portions54 for engaging the lower edges of the arms 47. rlhe front portion of the plate 46 is shaped to lit the outer periphery of the platen, as shown at 55, and the rear edge is curved outwardly, as illustrated at 56, to receive the edge of thepaper. The paper is directed between the feed 'roller 23 and the platen by-a paper table5'8f pivotallyV supported at 59 on the platen carriage and havingY a stop' 60 which bears against a shaft Gl?. for limiting the outward move# nient of the paper table.Y Fingers 62 project downwardly fromthe arms 47 and un derlie the projections 33 on the arms 24 so that when the arms are swung downwardly to release the paper'feed'rolls they willengage the fingers 62 andrelease the pressure of the deiiector plate A55K againstthe .platen,- thus facilitating adjust-ment vofthe paper on the platen. A single deflector plate may-be used for a plurality of sets of feed rollers andy it` is suitably recessed to permit the rollers to projectI through the plate t'oA engage the platen. The linger 62 may in some cases be omitted entirely so.` that only the feed rollers-are released when therpaper is to bev adjusted.

l c-lainiz-` L; Paper feed mechanism i; for typewriters sing; a plurality of; pai-rs1 of; rollers the -fafce of a 1 platen, spacing arms., A p vofallyfk sap-porting said@ rollersL at 0 pair having pivotal means journaled in their 'respective spacing arms and separate from thepivotal means for the rollersof the other pairs, means for pivotally supporting said arms intermediate said rollers, springs for engaging said supporting means to press f said rollers against said platen, and a device common to said supporting means for compressing said springs and freeing said rollers from the pressure thereof, said device thefother `pairs,-arms pivotallyconnected with said spacers intermediate the ends thereof, sprii'igs^ engaging saidV arms for forcing said rollers against the platen,- a shaft onv whichsaid,supporting arms are carried and with which said arms have va slight lost motion connection for rotary movement, means for holding said arms against longitudinal movement onf said shaft, and ineanslfor imparting a rotary movement to lsaid shaft to compress: said springs and release said rollers.

3. Paper feed mechanism for typewriters feed mechanism for typewriters comprising a stationary shaft extendida longitudinallyfof the typewriter carriage, a rotary shaft arranged parallel with said 1ste.- tionary shaft, laterally projecting arms mounted on said rotary shaft and. having perforations vthrough .which said rotary shaft extends, said perforations having flat tened` portions for engagingY a flattened face of said shaft, said engagingportions providing a slight lost-'motion vof rotation, a plurality of ypairs of: rocker arms veach pivoted between its ends )on one, of said laterallyextending arms, paper feed rollers journale'd betweeny the ends of each. pair 'of rocker arms, springs engaging saidv laterally extendingv arms and supported by said fixed shaft for pressing .saidfeed `rollers against the platen, and means for'nioving'said@ rotary shaft tocompress said springsand free said feed rollers. v

4. Paper feed mechanism comprising a rotary shaft, a plurality of'arms mountedon said shaft,- paper feedrollers carried by-saidV arms to. engage aplateir, separate arms also 'ect on' Sli-ete a pmfaiity ser?? Yof sets of paper feed rollers Vcarried by said arms, a deiiector plate carried by other arms freely rotatable upon said shaft, spring means for each of said arms to move theV parts supported thereby toward said platen, means for rotating said shaft to release said feed rollers, and means for connecting said deflector plate supporting arms with said feed roller supporting armsto release the pressure on said deflector plate when said shaft is rotated.

6. lPaper feed mechanism comprising a platen carriage having a platen journaled,

pivotally mounted on said rotary shaft for- -`supporting said defiector plate, and springs bearing upon said brackets for pressing 'said last-mentioned arms toward said platen.v

V7. Paper feed mechanism comprising a shaft, supporting arms mounted on said shaft, paper feed rollers carriedv by said arms, said arms having spaced bearing members connected with one another. and surrounding said shaft, and screws interposed between ysaid bearing members to prevent movementrof said arms along said shaft.

8. Paper feed mechanism comprising a shaft, a 'plurality of supporting arms ex# l and spacer barsfor saidrocker arms having pintles thereon forming a pivotal connection between said rocker ing arms.

9. Paper feed mechanism comprising a shaft, supporting arms having lost motion connection e therewith Vextending laterally vbars and said support- `.from said. shaft, rocker bars having paper,

feed rollers pivoted thereon, spaced bars for said rocker bars having pintles lat the ends thereof extending through openings in said rocker bars and said supportingarms to provide a -pivotal connection therefor, springs for pressing said supporting arms to hold said feedv rollers in operating position, and

means for rotating said shaft to compress said springs and free said rollers.

10. The combination with a platen carriage and a platen journaled thereon, of a fixed shaft extending parallel with said platen, a rotary shaft extending parallel with said platen, arms having a lost motion connection with said rotary shaft and pro- Y j ecting laterally therefrom, brackets on sai-d fixed shaft, springs interposed between said arms and brackets, rocker bars pivoted intermediate their ends upon sald arms, paper feedrollers journaled at the ends of said rocker bars, a deflector plate having` the front portion thereof shaped to conformv to the periphery of said platen but having the Vrearportion thereof spaced from the rearj platen, arms pivotally connected with saidv deiiector plate and journaled on said'rotary shaft, springs for urging said arms toward said platen, means for rotating said shaft to freesaid feed rollers from said platen, and means lfor moving said deflectorplate away Vfromvsaid platenwhen said feed rollers are V'freed therefrom. v 'Y 4 tending laterally from said shaft, lrocker .arms having feed rollers journaled therein,

In testimony whereof I have signed vmy name'to this .specification on this 30th day ofy

Images