US1812855A - Typewriting machine - Google Patents

Description

July 7, 1931. R. E. BENNER TYPEWRITING MACHINE Filed April 29. 1929 2 Sheets-Sheet l WITNESSES ATTORNEY July 7,1931.

R. E. BENNER TYPEWRITING MACHINE Filed April 29, 1929 2 Sheets-Sheet INVENTOR ATTORNEY Patented July 7, 1931 narra STATES PATENT OFFCE RUSSELL E. BENNER, OF MIDDLETOWN, CONNECTICUT, .ASSIGNOB TO REMINGTON TYPE- WRITER COMPANY, GF ILION, NEW YORK, A CORPORATION OF NEW YORK YTYPnirriirriive MACHINE Application filed .April 29,

mrplaten in the carriage with great accuracy and firmness or freedom from looseness or play in its bearings. Y Y

Another object of the invention, generally stated, is to provide highly efficient means of the character specified by which the platen may be readily detached and removed, when desired, without `removing the line spacing wheel and platen clutch from the carriage.

A further object of the invention is to provide eiiicient means whereby the platen, when remounted, will be effectively correlated and centered with reference to the line spacing wheel and platen clutch, and will be rmly and eectively connected with a lmember of the latter. Y

A still further object of my invention is to provide a construction 'such as indicated above which may be readily incorporated in existing machines, such for example as the Y No. 6 Remington-Noiseless machine, withoutA modifying, or materially modifying, the existing structural features of the line spacing mechanism and the platen clutch mechanism. I

To the above land other ends'which will hereinafter appear, my invention consists in the features of construction, arrangements of' parts and combinations of devices set forth in the following description and particularly pointed out in the accompanying claims.

ln the drawings, wherein like reference characters designate corresponding parts in,

the dierentl views Fig. 1 is an enlarged, detail, fragmentary, longitudinal sectional view taken centrally 5 through the left hand portion of the platen and associated parts; the view' showing the parts assembled and the platen mounted in place and connected to the line spacing wheel. Fig. 2 is an enlarged, detail, transverse sectional View taken on th@ lill@ -Qf Fig' i929. seriai No. 359,106. y

and looking in the direction of the arrows at said line; the view showing the manner of supporting the right hand end of the platen in the carriage.

Fig. 3 is an enlarged, detail, longitudinal sectional view taken through the right-hand end portion of the platen.

Fig. a is a view showing in perspective and separated, various parts that enter into the construction.

Fig. 5 is an enlarged, detail, fragmentary view, partly in section, of the left-hand end of the platen and some of the coacting parts, shown as they appear when the platen is disconnected from the platen clutch and is about to be removed from the carriage.

Fig. 6 is an enlarged, detail, transverse sectional view taken on the line 6 6 of Fig. 1 and looking in the direction of the arrows at said line.

l have shown my invention in the present instance incorporatedin the No. 6 Reming-I ton-Noiseless machine, in which said inven tion may be readily embodied without modi fying, or materially modifying, the existing structural features of said machine. It should be'understood, however, that the invention isnot limited to embodiment in such machine but may be employed in typewriting and like machines generally, wherever found available.

' The platen clutch disclosed herein is like that now in use in the #6 Remington-Noiseless machine and is disclosed in the patent to George Gr. Going, No. 1,595,463, dated Aug. 10, 1926.

In the Remington-Noiseless machine, more so than in other typewriting machines, it is highly essential, where a removable platen is employed, 'that its replacement, or the replacement of a substitute platen, in the machine shall be effected with the utmost eX- actness, since the, slightest variation in the position of the platen in the carriage may operate to a distinct disadvantage by reason of the pressure imprint of the type actions employed in this machine. lt is one of the objects of the present invention, therefore, to provide means for eecting a ready removal and replacement or .Substituting @t a platen,

in such a manner that the replaced or substituted platen will be firmly and accurately seated in the carriage as when originally installed at the factory and will be as firmly and accurately connected with its associated parts asin theoriginal facto-ry installation.

The carriage comprises a' cross bar 1 formed with oppositely grooved race-ways 2 A .to receive anti-friction rollers by whichy the carriage is supported on the case shift frame.V

whole bay-the reference numeral 8 comprises a tubular body port-ion or shell 9, which inV the present instance is Ymade of metal althoughithe ordinary wooden core may be employed, if desired. Thebodyportion 9 is'surrounded by the usual rubber sheath 10. rThe right-hand platen head 11 has an inwardly extending circular flange 12 that is received i in the yright-hand endof the tubular member 9,1 and is connected thereto with a drive fit.

Y This platen head has a long hub, hollow7 trunbOf - prevents'y av displacement thereof' along the nion or sleeve-like extension 13 which Vpasseslthrough the. bearing opening 7 inthe'end plate V4 of thecarriage and extends outward beyond said end plate. Surrounding the .hub 13 isfbearing sleeve or bushing'14 having a circumferentialV flange Y15 adapted to bear against the outer face of the end plate 4and limit theinward' movement ofthe bushing. Said bushing -is preferably taperedA towards its-inner end,` as indicated at 16, andisundercut within its bore, at 17,' to receive a; metal ringlSseated in a circumferential groove 19in the hub 13, for purposes which will hereinafter appear. Y When the bushing 14 is moved (within the platen) from right to. lefty in its bearing opening 7, itv is automatically centered therein by the taperedportion 'of the bushing and effects a Vfirm seating ofV the bushingfin thecarriage, and preventsrthe withdrawalof the hubV 13 up through Vthe open-mouth ofthe bearing opening 7. lVhen,

however, the platen'is shifted to the right the ring 18 causes the bushing 14 to be carried to the right out ofthe bearingv opening 7, and the hub 13, which-is smallerin diameter than themouth ofthe bearing opening 7, may

then bev lifted'up outofrsuch opening. A

21abuts the'outer end of the bushing 14" and hubl3'tothe right when the platen isflXed against longitudinal displacement..

' A spindle' or rod 23Y extends through the borecof'thehub 13.*andis squaredat itsouter", elle, as iedicatefllat 245e The Quterendofathisj spindle is tapped with an internal thread, at 25, to receive a headed screw 26. A bearing member 27 hasV a square bore 28 to fit the squared outer end 24 ofthe spindle, so that the member 27 and the spindle 23 are connected to turn together. Two oppositely disposed depressions or pivot bearings 29 arel provided in the outer side of the member 25 to receive square pivots 30 on a fiat semi-circular nger piece 31. This pivotal connection between the spindle-23 and the finger piece 31 connects the two, so that the finger piece is effective, when in operative position, to turn the spindle in the hub 13 and also enables the linger piece to be turned on its pivots 30 from its operative position shown in dotted lines in Fig. 3to theinoperatlve position, shown ink full lines in the same ligure. Whenthe finger piece is inthe expanded, dottedeline positionV it may be employed to'turn the spindle 23 independently of the platen but when not in use may be folded to a compact position adjacent to and parallel with the finger wheel 20. By reason of this folding of the finger piece 31, the machine may be received in the standard packing case now employed to ship the machines. Y Y

ln order to retain the linger piece 31 against accidental displacement from either'of the said positions to which it may be shifted, I haveprovided-a spring washer 32 that bears against one pair of flat faces or another 'ofthe' square pivots-3 0 andthus retains the fingery piece in eitherl of the said pivotal positions to which 'it may be shifted. An outerretaining member 33 has -a reduced shank 34 which eX tends through the central opening in the spring washer and is receivedin the central recess 35 in the member 27, and bears against said member and holds it against Vthe shoulder v36k on the spindle 23, formedat the junction platen is acollar 37 held-fast to thespindle bya pin 38. vThis is-toenable the spindle when disconnected at its innerA end to receive a-limited outward movement in the platen .A linger wheel 20-has a hub 21 that sur-- roundsthe hub'13 and is secured theretobyY two set screws 22. Theinner end ofthe hub in an openingin a connecting member 39,V

without, however,permitting the spindle to be detached from the platen.- Y

The inner end of theV spindle 23 is received a chuck orxclamping member, designated asl a whole by the reference numeral 43. The

outer end ofthe Connectingmember i rIo the left of the thread end 45, the pro- Y jection on the member 46 is squared at 48 to coact with the four clamping jaws 49 of they Chuck 43, saidjaws being separated by slits 50. The outerA surface of each jaw 49jis 4beveled at 51 to provide a cam face adapted v to coact with a corresponding cam face 52 onthe interior of the left-hand platen head 53, secured with a drive it in the left-hand end of the platen shell 9. The platen head 53also has a cylindrical bearing portion 54 in which a disk-like portion 55 on the chuck is received, supported and adapted to slide longitudinally of the platen. This platen head also has a cylin drical bearing portion 56 in which the outer segmental surfaces 57 of the chuck jaws are received and adapted to slide. In order to prevent the chuck 43 from turning relatively to the platen head 53 I provide a pin 58 that projects to the left from the disk-like portion 55 of the chuck, and is received and slides-in a bearing hole 59 that extends through the platen head.

The platen lhead 53 is further provided with a cylindrical, reduced bearing portion or hollow trunnion 60 adapted to be received in the bearing bushing 5 secured to the end plate 3 ofthe carriage. 'The inner surface ofthe bearing portion 60 receives, when the parts are assembled, a cylindrical bearing portion 61 on the member 46, whereas a larger bearing portion or trunnion 62 on the member re- Vceives a bearing in the Vbushing 5. Thus it will be seenthat the'platen and the` member 46 are both supported and aligned in the-same bearing 5. I

Soffaras the present invention is concerned any suitable platen clutch' mechanism may be employed,` and from certain aspects of Vmy inventionit is not 'essentiall that platen clutch mechanism be employed, in' which instance the member 46 may be regarded merely as'an element to which the line spacing wheel is affixed or connected. However, in lpractice l prefer to employ lplaten clutch mechanism `such as is'disclosed in the Going patent hereinbefore referred to, as it lends itself very readily without any'material change to use iniconnection with the devices of my invention for detachably mounting the platen in such a manner that the platen may be de- Y tached from the machine independentlyof f line-spacing wheel and the clutch mechanism.

In describing the platen clutch mechanism I will only brieiiyvrefer toit, so that a sufficient understanding of it may be arrived at forthe purposes ofetliepresent invention.

'Y i The inner side of the line spacing wheel or ring 47 iS provided Wit-h llleteeth'with which radially sliding pawls 64 are adapted to engage. These pawls slide in radial grooves or ways 65 in the member 46. A coiled compression spring 66 coacts with all three pawls and tends to disengage them from the teeth 63. rIhree plungers 67 are guided in slots 68 in a block 69 held with a drive Vfit in av recess in the center of the member 46. These plungers also move in registering ways 70 in a spindle 71 in which are also contained expansion springs 72 which force the plungers to the right and cause the cam faces 73 thereon to force the pawls 64 against the force of the spring 66 into engagementy with the teeth 63, thus locking the line spacing wheel and the platen to turn together.

A finger wheel 74 is connected to the spindle 71 by a set screw 74a, whereas the spindle has a splined connection with a bearing sleeve 75 riveted to a cover plate 76 which in turn is fixed to the member 46 by screws 77. rlhe inner end of the spindle 71 carries a ring 78 that overlaps the plungers 67 and moves them to the left to release the clutch pawls when the linger wheel 74 is pulled to the left.

A bracket 79 secured to the carriage coacts with the bearing sleeve 75 to provide additional support therefor. A collar 80 surrounds said bearing sleeve 'inside the upright arm of the bracket 79, and bears at one edge against said arm. A set screw 81 holds the collar in place. The function'of this collar is to prevent the part 46, and the various members connected thereto, from being withdrawn from' the supports 5 and 79 when the platen isv detached therefrom, as shown'in Fig. 5.

From what has been said it will be understood that when the platen clutch is released, by pullingout onvthe finger wheel 74, the platen may be turned by either of the finger wheels 2O or 74 independently of the line spacing wheel 47, which at this time is held against movement with the platen by the usual spring-pressed roller detent 82. When, however, the clutch is closed the line spacing Wheel and platen are locked to turn together. Now in order to detach the platen, the finger piece 31 is irst shifted to effective posit-ion shown in dotted lines in Fig. 3. y It is then turned in an anti-clockwise direction, as the parts are viewed from the right-hand end'of the platen. The effect of this is to los ' l43sothatits jaws 49 may spring away and Y allowed to'remain yon the carriage, but whichl be releasedjfrom clamping engagement with the parts 48 with which they were forced by the camming action vexerted on the jaws by the' cam 52 onthe platen head 53.

The platenis mounted in placev by reversing the operations referred to above. When a threaded connection zis` effected between vthe members 39y and 46 a tightening of such connection causes the jaws ofthe Vchuck tof-bear with-force on the part 48, due to the ca-Imning action on the jaws 49 of the cam face 52. Thisresults not only in firmly clamping the connected parts together, but in properly centering and .firmly holding the platen againstl displacement relatively to the bearings on the carriage and the parts which are are-'to vbe connected with the platen, such as theline spacing wheel and platen clutch.

" From the foregoing description it will be. understood that I Vhave provided highlyL effective means for the purposes set forth, which may be assembled without diiiioulty, and which allows a platenof onecharacter,

such forexample as aplaten which carries card clamping means, tovbe substituted fo-r another-and`difl'erent'- character of platen, such as afstandard platen not provided withV special card Yclamping means. Y'

Various 'changes may be-mradein the constructiomandparts thereof may be employed without others, without departing from` my Vbyilietters Patent, is: l' j v l1.1 YThe combi-nation of a carriage, a cylininvention ias it Vis'i defined in the. accompanyingQclaims. e y Y *What I claim as new and desire to secure drical4 platen, and means for detachablymounting the platen inthe carriage comprising; means that lenable thel platen to be removedfrom its Ybearings only byrst effecting a longitudinal displacement of the'platen in the carriage, a partthat remains fixed Yagainst .removal with the platen from the carriage, and a tie rod detachably connected with 'said part andthe detachment of-which rod therefrom is necessary tol afford a longi- 'drical platen, land means for detachably -tudinal displacement of the platen inthe carcombinationlo'f a carriage, a. cylinmounting-the platen inthe carriage comprisingmeans that enable the platen to Vberemovefdform its bearings only bY-frsi' effect# ing a' longitudinal displacement of the platen in theA carriage, a part thaty remains fixed against removal with theplaten from the carriage, a tie rod,'a threaded connection by which said tie rod may be detachably connected/with said part and the detathment* of which Vrod therefrom is necessary to'v afford a longitudinal displacement ofthe platen in the carriagefafnger pieceoutsideof the platen and operatively. connected tosaid tie rod to turn it, and means that enable said linger pieceto be folded toa compact vposition when not in use. t i

. 3. The combina-tion of a-carriage, a cylindrical platen, and means for detachably mounting the platen in the carriage comprising means that enable the platen tok be removed from its bearings only by first effecting a, longitudinal displacement of the platen in thecarriage, a platen clutch that remains fixed against removal with the platen from the carriage, and a tierod det-achably connected with a member of said platen clutch and the detachment of which rod therefrom is knecessary to afford a longitudinaldisplacement of the platen in the carriage.

4. 4'llhecombinat-ion of arcarriagefa cylindricalv platen, and means' for detachably mounting t-he platen in the carriage comprising means that ,enabletheY platen to be removed from its bearingsonly by firsty effect-r ing a longitudinal displacement of theplaten in the carriage, a part that remains'iiXed against removal with the platen from the carriage, atie rod, a threaded connectionvby which said tie rod, may be detachably connected with said part and thedetachment of which rod` therefrom isfnecessary to afford i a vlongitudinal displacementl of the platenin the-carriage., a finger piece outside ofthe t platen-.and operativelyconnected to said tie rod to turn it, means that enable vsaid finger piece tov be folded to a compactpositionwhen not in use, and means for holding said finger Y piece against yaccidental vdisplacement from either its position fornse or from itsfolded compact position.

5. The combination ofiajcarriage, a cylin- Y dricall platen, andA Vmeans for*v detachably mounting the platen in theicarriage comprising means ,--thatxenablethe platen to be* removed from itsfbearingsonly by first effecting a longitudinal displacement of the platen in the carriage, a. par-t that remains Xed againstV removal with the platen from the carriage, a tie rod detachably connected withA said part and the detachment ofrwhich rodA Vtherefrom is necessary to-aord a longitudi nal displacement ,of the platen inthe car-V riage, a *chuck adapted topclamp'jor engage said part, and meansjfor freeing said chuck from such engV gement when said vtie rod` is. beingdisgconnectedfromsaid part. i 7 6. The combinationof acarriage,a cylinmounting the platen in the carriage comprising means thatenable the platen to be removed from its bearings only by first effecting a longitudinal displacement of the platen in the carriage, apart that remains iixed against removal With the platen from the carriage, a tie rod, a threaded connection by which said tie rod may be detachably connected with said part and the detachment o-f which rod therefrom is necessary to afford a longitudinal displacement of the platen in the carriage, a linger piece out-side ofthe platen and operatively connected to said tie rod to turn it, a chuck actuated to clamp or engage said part When the tie rod is threaded int-o place and to free itself from said part When the tie rod is threaded away from said part. Y v

7.` The combination of a carriage, a cylindrical platen, and means forl detachably mounting the platen in the carriage comprising a carrier for the line spacing Wheel, Which carrier and. line spacing Wheel remain fixed against removal With the platen from the carriage, a chuck carried by the platen, a tie rod carried lby the platen and having a threaded Aconnection With said carrier andy also operatively connected to said clutch to control the opening and closing thereof.

8. .The combination of a carriage, a cylindrical platen, and means for detachably mounting the platen in the carriage compris- `ing a member xed against removal with the platen from the carriage, a chuck carried by the platen and adapted to engage said member, a tie rod carried by said platen and having a threaded connection with said member and also operatively connected with said clutch to control the opening and closing thereof, anda finger piece on said tie rod by Which it may be turned independently of the platen.

9. The combination of a carriage'having end plates, a cylindrical platen, bearings for the platen said end plates, one of said bearings being a cylindrical bearing in Which a vbearing member ongthef platen is received and removed an end wise movement of the platen, kthe other bearing being formed by an open-ended slot from which a bearing member on the platen is displaced endvvise before the platen hub can be liftedout of the open-ended slot, a finger piece carried by the platen, and means controlled'thereby for holding the platen against endvvise displacement in its bearings.

y 10. The combination of a carriage having end plates, a cylindrical platen, bearings for the platen insaid end plates, one of said bearings being a cylindrical bearing in which a bearing member on the platen is received and removed by an endwise movement of the platen, the other bearing being formed by an open-ended slot from Which `a bearing ymember on the platen is displaced by an end- Wise movement of the platen before the platen hub can be lifted out of the open-ended slot, a part which is supported in and fixed against removal from said cylindrical bearing, and atie rod Which extends through the platenv and is detachably connected to the said part.

1l. The combination of a carriage having end plates, a cylindrical platen, bearings for the platen insaid end plates, one of said bearings being a cylindrical bearing in Which a bearing member on the platen is received and removed by an endwise movement of the platen, the other bearing being formed by an open-ended slot from which a bearing member on the platen is displaced endwisc before the pla-ten hub can be lifted out of the open-ended slot, a part which is supported in and iixed against removal from said cylindrical bearing, a chuck in the platen, and means for opening and closing said chuck on said part.

l2. The combination of a carriage having e'ndvplates, a cylindrical platen, bearings for the platen in said end plates, one of said bearings beinv a cylindrical bearing in which a bearing member on the platen is received and removed by an endwise movement of the platen, the other bearing being formed by an open-ended slot from Which a bearing member on the platen is displaced endivise before the platen hub can be lifted out of the openended slot, a part which is-supported in and fixed against removal from said cylindrical bearing, a tie rodfWhich extends through the platen and is detachably connected to the said part, a chuck in the platen, and means controlled by said tie rod for opening and closing said chuck.

13. The combination of a carriage having end plates, a cylindrical platen, bearings for the platen in said end plates, one of said bearings being a cylindrical bearing in which a bearing member on the platen is received and removed by an endwise displacement of the platen, the other bearing being formed by an open-ended slot from which a bearing member on the platen is ldisplaced endWise before the platen hub can be lifted out of the open-ended slot, a tapered-bearing sleeve that surrounds a hub of the platen and when the platen is in place receives a bearing in the open-ended slot and prevents the said hub from being lifted through the open mouth of the bearing, and releasable means for holding the platen against endwise displacement in its bearings.

14. The combination of a carriage having end plates, a cylindrical platen, bearings for the platen in said end plates, one of said bearings being a cylindrical bearing in which a bearing member on the platen is received and removed by an endivise displacement of the platen, the other bearing being formed by an open-ended slot from Which a bearing mem- Yso bei; on' theplaten is i displaced ,endW-ise; before the platen hub can be vliftedout ofthe-openfendedfslot, a tapered bearing sleeve that surrounds a hub of the platen and Whenl the platen isV in lplace receives a bearing in the open-ended slot and prevents the said hub from being lifted through the open mouth of tlf; bearing, and releasable means for holding the platen against endvvise displacement inf its bearings, said releasable means comprising a part which is supported in and fix-ed lagainst removalfrom said cylindrical bearing, and a hand actuated tie rod Which extends through' thefplaten and has a de-k tachable threaded connection With'said part.

15. The combination of a carriage, a cylin# drical platen, and means yfor Vdetachably mounting the platen in the carriageVv compris'ing bearings on the carriagel for the -platen and from vvhich the'platen can be removed only by eecting an initial longitudinal displacement of the platen in `said'bearings, one of'said bearings being provided by an open-endedbe'aring slot, and a Vtapered bearing sleeve'carried by the platen andv pro-` viding a bearingtherefor, said sleeve adapted toV be seatedand find a bearing in said open-I ended bearing slot andvvhen thus seated'to prevent a removalthroughthe open-mouthv prising aV rotativepart that remians iixed against removal from the carriagevand to which the platen may be 'attached and from vvhicli'it maybe detached vWithout removing said rotative part from the machine, a chuck carried by the platen, and means for closing said chuck on vsaid rotative part When the platen is kin place and for disengagingthe chuckfrom said'rota-tive part preliminary to Y 'aremoval of the platen from the carriagei Vin the carriage.

17,.` The combinationof a carriage,a cylindrical platen, a'platen clutch that remains fixed against removal'from the carriage, and means for detachably mounting the platen in the carriage for removal independently of said clutch, said means comprisinga chuck carried by the platen, and means for closing saidl chuckfon a member of said platen clutch to hold thev platen and said clutch member.

a removal ofthe platen independently of said platen clutch and lvvhile the -latter remains lindricalplaten, aline spacing Wheel, a carrier for the line spacing Wheelvvhich carrier and line hspacing Wheel 'remain fixed againstl removal with the platen from the carriage,

isi-2,855

andmeansffor vdetaehablymountingljthe Y platen in thecarriage for removal'independentlyof said line spacing Wheel and carrier,'sa1d means comprising a chuck carried by-the platen, and rmeans for closing the chuck on said carrier to connect the platen and carrier and for opening said chuck Vto release the connection and permit the removal of the carriage forremoval'there'from independe ently of said rotative member, saidmeans comprising a chuck carried'by the-platen and Y adapted to engage said member, and means extendingoutside of the platen forcontrolling they opening and closing of saidchuck.

v20. The combination ofa carriage, acylindricall platen, a.V rotative member fixed against're'moval fromthe carriage, and means fory detachably mo'untin the platen inv the carriage for removal independently'of said rotative member, said means comprising'V a chuck carried by theplatenand adaptedto engage said member,a'platen headhaving'a camvvith which thevjavvs 'of said chuckl coact to control. the opening `and closing ofthe A chuck onsaid member, means for controlling a Ylongitudinal shifting movement of the chuck in the platen and thereby bring about the opening or closing ofthe chuck through y the action of said cam` thereommeansy for disconnecting said controlling means from the chuck, and means for aiording an axial displacement ofthe platen after such disconnection hasbeen effected.

21. The combinationof a carriage, `a cylindrical platen having a supporting portion, and means for detaclliably` mountingvv the platen'in lthe carriage comprising bearings on the carriage for the platen andv from Which the platen can be removed onlyby effecting an initial longitudinal displacement of the platen in said bearings, one of'said bearings being provided byv an open-endedl bearing ico slot, a tapered bearing sleeve carriedby the Y Yplaten and providing a bearing therefor, said sleeve adapted to be seated and vfind a bearing in said open-ended bearing slot and When thus seated prevents Vremoval of Vsaid supiporting portionV ofthe platenthrough the Ao-penemouth ofVV the bearing slot butn vvhen displaced from said bearing *byv a longitudinal displacement of the platen enables theremovalv of saidA supporting portions of Ythe platen' through saidopen-inouth of the bearing slot, a tie rod and associated connections that prevent a longitudinal displacement of the platen in its bearings, anda member connected With the platen and Which bears against said 'sleeve When the tie rodis in Y Aplace and kprevents a displacement ofthe sleeve from the bearing slot in which it is seated.

22. The combination of a platen having a h'ub, a carriage having end plates, a line spacing Wheel carried by and permanently mounted for rotative movement on one of said end plates, bearings for the platen in said end plates, one of said bearings being a cylindrical bearing in which a bearing member on the platen is received and removed by an endwise movement of the platen, the other bearing being formed by an openended slot from which a bearing member on the platen is displaced endWise before the platen hub can be lifted out of the openended slot, a finger piece carried by the platen, and means controlled thereby for holding the platen against endwise displacement in its bearings and for detaehably connecting the platen to said line spacing Wheel.

Signed at Middletown in the county of Middlesex and State of Connecticut, this 24th day of April, A. D. 1929.

RUSSELL E. BENNER.

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