US931680A - Type-writing machine. - Google Patents

Description

J. \T.CO0PER.

TYPE WRITING MACHINE. APPLICATION FILED Ammo, 1908.

Patented Aug. 17; 1909.

2 SHEETS-S`HEET l.

...1-21-11I?IIIIIIZII-- VV n e 6s e@ J. J. COOPER.

TYPE WRITING MACHINE. APPLICATION FILED APR. so, 190s.

93 1,680. I Patented. ug. 17, 1909.

2 SHEETS-SHEET Z.

/ff-MW- UNITED sTATEs PATENT oEEroE.

JOHN' JOSEPH COOPER, OF LONDON, ENGLAND, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OFNEW JERSEY.

TYPE-WRITING MACHINE.

To all whom it may concern: l

Be it known that I, JOHN JOSEPH COOPER, a subject of the King of Great Britain, residing in the city of London, England, have invented certain new and useful Improvements in Type-Vi-iting Machines, of which the following is a specification.

This invention relates to the paper-feeding devices orrevoluble platensof typewriting machines, and particularly to the means whereby the paper is fed or moved in line-spacing direction. f

The present invention is in the nature of an improvement upon the mechanism shown in my copending application No. 413,730 filed February' l, 1908.' In said application means are shown forfeffecting rotation of the platen step by step to any predetermined extent'regular or irregular toaccord with the printed forms used; means being shown in said application for mechanically arresting the rotation of the platen at a succession of lpredetermined irre lar intervals, said arresting means inclu ing a .succession of stops connected by gearing tothe platen, and a detent upon the platen frame to coperate with the stops seratz'm, whereby after the leading edge of the sheet or blank is inserted, the platen canbe rotated until arrested by the first of said stops, thereby advancing the sheet to the exact position to receive the first line of writing; and after such line is written, the platen is' again advanced until arrested by the next stop, .and

so on. The stops are shown arranged'in a helix or spiral to control the platen movements during a plurality of its revolutions, the stops being Ain the form of pegs or screws inserted in a helical series of holes formed upon the periphery of the barrel; the latter connected to the platen by'gearing and rotating faster than the platen.` The platen was rotated by a pawl and ratchet mechanism operated by a crank, and the latter also operated means to release the detent after the completion of the stroke of the platen.

The objects of the present invention are to provide for compact mounting of the Sto mechanism in the machine, especially Wit 'a view to enabling the platen to be rotated step by step to effect re ilar line-spacing when desired, by means o the Ordinary linespacing mechanism, and to enable 'the platen to be rotated independently of said stop vmechanism whenever required.

Specification of Letters Patent.

Application led April 30, 1908. Serial No. 430,211.

Patented Aug. 17,'1909.

The stop mechanism according to my present improvements is mounted all at one end of the platen frame, preferably the right hand end, the usual regular line-spacing mechanism being mounted at the left hand end of said frame, as in the well known Underwood typewriter; and the platen may be rotated and controlled by either set of linespacing devices at'will. A releasable clutch 1s also arranged between the platen and thc special stop mechanism, so that the platen may'be rotated at any time independently of suchstop mechanism. The clutch comprises two members one of which is connected to the stop mechanism, and the other of which 1s fixed upon the platen axle, and may be moved axially of the platen to eifect the release.

Other features, objects and advantages Will hereinafter appear. In the accompanying drawings, Figure l 1s a plan of a platen frame of an Underwood front strike writing machine embodying the present improvements; the parts being shown 1n normal positions, and the platen clutched to the special sto mechanism. Fig. 9. is a. view of the specia stop mechanism showing the` detent as having traversed the helical series of stops. .Fig 3 is an elevation of the parts seen at the right hand of Fig. 1, thc platen being shown disconnected from the special stop mechanism. Fig. 4 is a side elcvation illustrating the platen driving crank as having nearly completed its return stroke to normal/position. Fig. 5 is an elevation illustrating the manner of releasing the. detent from the stops at the completion of thc return stroke of the crank. Fig; 6 is a view similar to Fig. 5, but showing the crank at the completion of its platen driving stroke and showing the detent engaging a stop. Fig. 7 is a detail of a stop-arresting detent. On a larger scale, and corresponds with Fig. 6. Fig. 8 is a viewsimilar to Fig. 7, but illustrating the manner of releasing the detent.

A platen 1 is mounted by means of an axle 2in a platen frame comprising ends 3, 4, and a. paper shelf 5.

To effect irregular line-spacing,.the operator pulls forward a handle 7 provided upon a crank 8, which is loosely .journaled O11 a stud 9 .mounted upon the .right hand platen cnd 4. A pawl 10 pivot/ed on said crank is pressed by a spring 11 into engagement with ico -blank line on the sheet to be written.

hollow shaft 14a which" turns in the platen frame end 4, and contains the platen shaft 2.'

Mounted upon said sleeve between the platen end and the end 4 of the platen frame is a gear 15. Saidl gear meshes with a pinion 16 which is fixed to-a barrel 17. Both pinion and barrel ae loosely mounted upon a rod 17 a extending from end to end of the platen frame concentrieally with the stud 9 and carrying the usual adjustable front paper guides 17 h. i

A helical series of holes or perforations 18 extendsaroun'd the barrel 17, and as many stop pilis 19 as may be necessary are inserted in the proper holes to lcorrespond with the Owing to the movement-innltiplying gearing 15, 16, the periphery of the barrel 17 travels about twice as fast as that of the platen, and the holes 18 are sufficiently close together so that the adjustment of the stop pins may cori'espoiid approximately with the blanks on almost any kind of a blank form. The stops preferably consist of the heads of screws i which are threadedinto the holes 18.

Vhen the handle -7 is pulled forward as aforesaid, the platenand stop barrel or rack are advanced until the first stop 19 is engaged by the nose 20 of a pawl 21, whereby .the barrel and platen are arrested, as at Figs.

2 and `v1. in position for the insertion of a sheet of' paper into the machine. The leading edge of the sheet is introduced between -the platen and the rear pressure roll without ieleasiiig the latter. The crank is swung to effect fine adjustment, to cause the writ-ing to fall with accuracy upon the desired line upon the blank.

The crank is returned to normal position by a spring 20; and at the final portion of its Areturn movement a bar 26, projecting from the crank 8, engages a finger 27 formed on the pawl 21, thereby turning said )awl about its pivot 28 to lift the nose 2() aiove theI stop 19. Figs. 5 and 8. A spring 30 tends constantly to throw down the nose of the pawl. The latter has a horizontal slot Fig. 7, whereby it 'engages its pivot pin 28, the purpose of the slot being to permit the spring 30'to draw the detent bodily back, Fig. 8, to cause the nose 20 to ride over the to being mechanicall y held in this released posi of the pir 19, the detent rotate the platen.

To enable the detent to move automatically from left to right to traverse the'helix as the barrel 17 revolves, so that the detent may engage all of the stops 19 in succession, a snail or helical cani 33 is fixed upon the outer-side of the gear 13, and as the cam turns an arm 34 is'ca-used to-.travel from left to right to carry the detent 27 along the lbarrel 17. The cam 33 extends almost en tirely around the stud 9 and rotates at about one quarter the angular speed of the barrel 17, the helical series of holes 18 accordingly extending four times around said barrel. The left to right movement of the arm 34 is imparted to a slide 35, upon which is fixed an arm 36 carrying said detent 21. The arm 34 is fixed upon said slide, and the forward end of the arm has a bearing 37 to slide upon 'the stud 9.y `The slide 35 is in the form of a tube Working in the vertical wall 4a of the platen frame end, Fig. 4, and sliding upon a fixed rod 38, which is carried by an arm 39 fixed upon the rod 17a. The barrel 17 and pinion. 16 are confined between said arm 39 and 'the end 4 of the platen frame. The gears 15 and 16 are just within the Aend of the platen frame and the othergears just outside thereof, the whole making a very compact structure that .may be applied to' existing types of machines, and, being allat the right hand end of the platen frame, needfnot interfere with the usual line-spacing mechanism at the left hand end thereof.

The throw of the cam 33 is equal to the distance between the first and last stop holes barrel, so that the'detent 21 upon the arm 36I is caused to traverse the helical series of holes at a speed corresponding to the pitch of the helix, so that it is caused to engage serz'atz'm all of the stops 19 wherever disposed u on said helix. The releasing bar 26, it will be seen, extends transversely of the helix or longitudinally of the barrel 17 for a sufficient length to be 'enabled to engage the detent-finger 27 at all points in the travel of the detent.

At the completion of the writing of the sheet, the arm 34 runs oftl the apex of the cani A spring 42 ret-urns the arm, slide Then the handle 7 may be pulled forward until thev detent engages the first stop 19, whereupon a second sheet is inserted bctween the platen 1 and the pressure roll,

The platen is connected to the described -stop mechanism by means of a clutch which.

disks, one of them, designated as 43. being fixed upon the platen axle 2, and the other 44 being fixed upon the sleeve 14, which T tion until the crank 8 is drawn forward to on| the barrel 17 considered lengthwise of the 35 and the detent 21 to normal positions..

is illustrated in the form of two toothed' and the operation is repeated line by line.

carries the gear 15. By pressing upon a hand wheel 45 fixed upon the outer end of the platen axle 2, the latter may be pressed inwardly, Fig. 8, toseparate the clutch disk 43 from the disk 44, s o that the platen may be rotated independently of the stop mechanism, or so that theJ stop mechanism 'may be rotated independently of the platen as may be desired. A compression spring 46 causes the clutch members to rengage when the y hand wheel 45 is released'. It will be seen that the same hand wheel 45 may be employed both to release the platen and to turn it. while released. The clutch teeth are shown diagrannnatically, but it will be understood that they may be ot any suitable form to effect a Arigid connection between the platen and the gear 15. At the left,v hand end of the platen the usual line-spacing lever 47 may be operated to drive back the usual slide 48 upon which is 'pivoted a pawl 49 to engage the usual line-space ratchet. wheel 5() provided with the usual spring detent 51. If it is desired to operate the lever 47 independently of the stop barrel 17, it is only necessary to press the Vfinger against the end of the hand Wheel 45 to release the clutch 43 While the lever 47 is `'being operated. It however, it is desired to operate the lever 47 and Write line by line by means of the usual types 52, Fig. 4, until the platen is arrested by the engagement of the detent 21 with one of the stops 19, said detent may be held down by the finger during. the operation ofthe lever 47.

The ratchet Wheel detent 51 may be released by the usual releasing lever 53 to per- Vmit the operation of the platen by the crank 8, instead of by the lever -47, so that the platen will be arrested at points determined by the stops 19. It will also be seen that after the platen has beenreleased by said lever 53, and turnedby the crank 8, the hand Wheel 45 lnay be pressed'in and fine rotative adjustment of the platen; eifected, and then the platen reclutched to the stop mechanism while releasing said hand wheel 45, and the clutch teeth 54 may be of very line pitch for this urpose.

Variations may be resorted .to wit-hin the scope of the invention, and portions ot the improvements may be used without others. Having thus described my invention, I claim:

- l. In a typewriting machine, the combination with a revoluble platen having an axle and a platen frame having ends, of a ratchet wheel mounted at one end of the platen frame, a crank, a pawl to operate the ratchet wheel, a` gear and a helical cam both secured to said ratchet wheel, a pinion upon the platen axle and meshing with said gear.

a second gear upon the platen axle at said end of the platen frame and rigid with said pinion, a second pinion meshing with the second gear, a revoluble barrel mounted at said end ot the platen frame andcarrying-,a helical series of stops, a detent to engage the stops in succession, and means for enabling the ca m Ito move the detent along the barrel at a speed corrcspomling to the movement ot the barrel.

2. In a typewriting machine., the combination with a revolublc platen 'having an axle, and a platen frame having ends, of a ratchet wheel mounted at one end of the platen frame, a crank, a pawl thereon to operate the ratchet wheel, a gear and a cam secured to said ratchet wheel and mounted at sa'itl endlI of the platen frame, a pinion upon the platen axle and meshing with said gear, a second gear upon the platen axle at said end of the platen frame, a second pinion meshing With the second gear, arevoluble barrel mounted at said end of the platen frame and carrying a helical series of stops, a detent to engage the stops in succession, means for enabling the cani to move the detent along the barrel, and a bar upon said crank and extending along the barrel to engage said detent to release the same at the completion of the return stroke of the crank.

. 3. In a typewriting machine, the combination With a platen frame having ends and a platen having an axle and revolubly mounted in said ends, of a barrel anda pinion secured together and both revolubly mounted between the platen and one end of theiplaten-frame, said barrell having a helical series of stops, a gear upon the platen axle and in mesh with said pinion, a second pinion lixed to said gear, a second gear mounted upon said platen frame and in mesh with the second pinion, a ratchet Wheel upon said second gea-r, a spring-pressed crank having a pawl to engage said ratchet wheel, a helical cam upon the second gear, a traveling frame having an arm to engage said cam and provided with a returning tion with a laten frame havinO ends vand a platen having an axle and revolubly mounted in said ends, of a barrel and a, pinion secured together and both revolubly mounted between the platen and one end of the platen-frame, .said barrel having a helical series ot stops, a gear upon the platen axle and in mesh with said pinion, a second pinion fixed" to said gear, a second gear mounted upon said platen frame and in mesh with the second pinion. a ratchet wheel upon said second gear, a. spring-pressed crank having a pawl to engage said ratchet wheel, a helical cam upon'the second gear, a traveling frame having an arm to engage said cam and provided with a returning spring, a detent upon said traveling frame spring, Vand a detent upon said traveling to engage said stops, and a bar'projecting from said t crank to engage said detent to release the same from any of said stops.

5. 'In 'a typewriting machine, the combination with a platen frame having ends and a platen having an axle and revolubly mounted in said ends, of a barrel and pinion secured- .a ratchet wheel fixed upon said second gear,

a ciank having a pawl to engage the ratchet wheel, and adetent to coperate withstops upon the barrel, said detent releasable by said crank.

6. In a typewriting machine, the combiriation with a platen frame having ends and a platen having` an axle and rcvolubly mounted in said ends, of a barrel andpinion secured together and both revolubly mounted between the platen and one end of the platen frame, said barrel having a series of stops, a gear upon the platen axle and in mesh with said pinion, a second pinion fixed to said gear and outside of said platen frame, a second'gear in mesh with the second pinion, a ratchet wheel fixed upon said second gear, a crank having` a pawl to engage the ratchet wheel, a detent to cooperate with stops upon the barrel, said detent releasable by said crank, a cam upon the second gear, and a device operated by said' cam to cause said detent to move along said barrel; the stops upon the barrel being helically arranged.

7. In a typewritin machine, the combination with a lat-en rame having ends and a platen having an axle and revohibly mounted in said ends, of a barrel and pinion secured together and both revolubly mounted between the 'platen and one end of the platen frame, said barrel having a series of stops, a gear upon the platen axle and in mesh with said pinion, a second pinion fixed to said gear and outside of said lplaten frame a second gear in mesh with the4 second pinion, a ratchet Wheel fixed upon said second gear, a crank having a pawl to engage the ratchet wheel, a detent to coperate with stops upon the barrel, said detent releasable by said crank, a cam upon the second gear, and a device operated by said cam to cause said .detent to move along said barrel; the

stops upon the barrel being hclically arranged; and said cam-operated device being in the form of a slide mounted upon said platen frame end and having an arm to which said detent is pivoted and also having an arm engaged by said cam.

8. In a typcwriting machine, the combination with a platen fi'aiiie having ends and a -platen having an axle and 'revolubly `a helical series of stops, a gear upon the platen axle, and in mesh with said pinion, a second pinion fixed to said gear and outside of said platen frame, a second gear in mesh with the second pinion, a ratchet wheel fixed upon vsaid second gear, a crank havinga pawl to engage the ratchet wheel, a detent to coperate with stops upon the barrel, said detent releasable by said crank, a cam upon the second gear, a slide mounted upon a stud which is carried by an `arm lprojecting rearwardly from said rod, said slide ,having outside of the platen frame an arm engageable by said cam, and having a bearing upon a stud which carries the second gear, said detent pivoted upon said slide.

9. In -a typewriting machine, the combination with a platen, of a ratchetwheelvconnected thereto, a crank or lever, a pawl connected to said crank to operate thc ratchet wheel, a succession of stops to determine the line-spacing lmovements of the platen, a de` nation with a platen, of a ratchet wheel connected thereto, a crank or lever, a pawl connected to said crank to operate the ratchet wheel, a succession of stops to determine the line-spacing movements of the platen, a dei tent to engage said stops in succession to arrest the platen, a projection upon said crank to engage said detent to release the same, said stops being mounted in a helical series, and means being provided to cause the' detent to traverse said helix and saidprojection extending across said helix to engage said detent at all points in the travel thereof.

l1. In a typewriting machine, the combination with a platen frame and' a platen having an axle, of a barrel and a pinion secured together and both revolubly mounted within the laten frame at one end of' the platen, said l)iniiirel having a helical series of stops, a gear upon the platen axle and in mesh with said pinion, a second pinion fixed to said gear,a second gear in mesh with said second pinion, said-second gear concentric with said barrel, a ratchet wheel u on said second gear, said ratchet wheel con ned between the second gear and the barrel, a crank having a pawl to engage the ratchet wheel,- a detent to engage stops upon said barrel, and means to enable the crank to release the detent.

1'2. In a typewiitiiig machine, the combination with :i )laten frame and a platen lia'ving an axle, oi

a barrel and a pinion secured ,together and both revolubly mounted within ing a pawl to engage the ratchet wheel, a

detent to engage stops upon said barrel,'

means to enable the crank to release the detent; said stops being arranged in helical series, and a helical cam being provided upon the exterior of said gearand connected to means'to cause the detent to travel along the barrel.

13. In a typewriting machine, the combination with a revoluble platen and regular step-b v-step line-spacing mechanism therefor, ot' a supplementary line-by-line spacing mechanism including means for mechanically arresting the rotation of the platen step by step at a. succession of predetermined irregular intervals.

V1st. Ina typewriting machine, the combination with a revoluble platen and regular step-by-step line-spacing mechanism therefor, including a. line-space lever, of a second lever normally disconnected from the platen, but connectible therewith 'to move the platen, and means for mechanically arresting the rotation ofthe .platen eiiected by the second lever at a succession of predetermined irregular intervals` throughout a cycle consisting of a plurality of revolutions of the platen.

' 15. In a typewriting machine, the combination with a platen and a platen frame, of

a regular step-by-step line-spacing mechanism at one end of the platen and platenrotating mechanismv at the other end of the platen, and including a iinger-piece, and a succession of stops to arrest the platen lineby-line as the platen is turned in on'e direction.

16. In a typewriting machine, the combination with a laten and a platen frame, of a regular step-by-step line-spacing mechanism mounted at one end of the platen, a crank or nger-piece mounted at the other end of the platen and connected to the platen by movement-multiplying gearing, and a succession of stops to arrest the platen lineby-line when rotated in one direction by said crank; the latter normally disconnected from the platen.

17. In a typewriting machine,` the combination with a platen, of a regular step-bystep line-spacing mechanism for the platen, an a supplementary line-by-line spacing mechanism, includin 'a succession of stops' and a-releasable mem er to engage said stops seriatz'm to arrest the platen at successive predetermined intervals.

18. In a typewriting machine, the combination with a platen, of two sets of line-byline spacing devices, one set effective to permit the platen to make only line-by-line movements at regular intervals, and the other set including an irregular succession of stops for arresting the platen at their regular successive intervals in its advance movements.

19. In a typewriting machine, the combination with a revoluble platen, of two ratchet wheels, a line-spacing lever and a` pawl for one of said ratchet wheels to eiiect regular step-by-stepvline spacing of the platen, a lever and pawl for the other of said ratchet wheels, movement-nmltiplying gearing between the second ratchet wheel and the platen, and a succession of stops to arrest the platen line-by-line at successive varying intervals as it is turned in one direction.

20. In a typewriting machine, the combination with a platen revoluble for line-spacing, of a line-by-line spacing mechanism including means for mechanically arresting the rotation of the platen at a succession or' predetermined irregular intervals, a releasable clutch being provided between the platen and the arresting means.

21. In a typewriting machine, the combination with a platen revoluble for linespacing, of means for mechanically arresting therotation at a succession of predetermined irregular intervals throughout a cycle consisting of a, plurality oi' revolutions of the platen; the platen -being normally connected by means of a clutch to said arresting means, and means being provided to release thc clutch to enable the platen to be rotated independently of said arresting means.

22. In a typewriting machine, the combination with a pla-ten, of a ratchet wheel, means including a clutch normally connecting the ratchetwheel to the platen, a finger-piece having a pawl to operate said ratchet wheel, a succession of stops to arrest the platen at successive intervals when operated by said finger-piece, and a hand wheel having means both to release the platen from said clutch and to rotate the platen when released.

28. In a typewriting machine, the combination with a platen, ot a ratchet wheel, means includingga clutch normally connectingr the ratchet wheel to the platen, a {ingerpiece having a pawl to operate said ratchet wheel, a succession of stops to arrest the platen at successive intervals when operated i but connectib nation with a revoluble platen and regular step-by-step line-spaing mechanism theret'or, of supplementary line-by-line spacing mechanism including a succession of stops for .mechanically arresting the rotation of the platen at a succession of predetermined intervals, and means for releasing the platen from said supplementary arresting means.

25. In a typewriting machine, the combination with a revoluble platen and regular step-by-step line-spacing mechanism therefor, including a line-space lever, of a second lever normall disconnected from the platen, l] therewith to move the platen, means for mechanicall tionV of the platen e ected by t-he second lever at a succession of predetermined irregular intervals throu hout a cycle consisting of a plurality o revolutions of the platen; a normally effective -clntch between said arresting means and the platen, and means for releasingsaid clutch.

26. In a typewritiiig machine, the combi nation with a platen and a platen frame, of

" a regular step-by-step line-spacing mechanism at one end of t-he platen and platenrotating mechanism at the other end of the platen. and including a finger-piece, and a succession of stops to arrest the platen lineby-line as it is rotated in one direction; a releasable clutch being provided between said platen and said succession of stops'.

27. In a typewriting machine, the combi-` nation wtli a platen and a platen frame, of a regular step-by-step line-spacing niechanism mounted at one end ot the platen, a crank or linger-piece mounted at the other end of the platen and connected to the platen by movement-multiplying gearing, a revoluble succession of line-by-line stops, a normally etle'ctive clutch between the stops and the platen to enable them to arrest the platen at successive intervals, and means to release said clutch.

28. In a typewriting machine, the combination with a Y laten, two sets of lincby-line spacing (evices, one. set eiiective to permit the platen to make only line-by-line movements at regular intervals. and the other set connected to the platen4 by means of a releasable clutch` and including an irregular succession of stops for arresting the platen at. their regular intervals in its advance movements. y

29. In a typewriting machine, the combination with a revoluble platen, of .two ratchet.- wheels, a line-spacing lever and pawl for one of said ratchet wheels to effect regular step-by-step line spacing of the platen, a lever and pawl for the other ofy said ratchet wheels, movement-multiplying gearing between the second ratchet wheel and the platen, and a succession of stops to arrest the platen at successive varying interarresting the rotavals; said succession ofstops releasably connected to the platen by means of a clutch.

301 The combination with a.platenz,revo liible for line-spacing, of a revoluble succession of line-by-line stops arranged in a helix or spiral, movement-multiplying gearing betweenthe platenand the stops, and means to 'coperate-with' said stops to arrest 'the platen; said succession' of stops being connected to the platen by means of a releasable clutch. v i

31.- The combination with a platen revoluble for line-spacing, of a` linger ieee for rotating the platen, movement-mu tiplying gearing between the finger-piece and the platen, a revoluble succession of line-by-line stops arranged in a helix or spiral, movelspacing mechanism including a ratchet wheel, a lever and pawl to operate the same, niovement-multiplying gearing between the ratchet wheel and the platen, a succession ot' stops arranged in a` helix or spiral, and means to coperate with said stops serz'atim to arrest the platen; said platen being connected by a releasable clutch 'to said succession ot' stopshv 33. In a ,typewriting machine, the -combination with platen, of a line-by-liiie spacing mechanism including a succession of devices independently adjustable in linespacing direction, means coperative wit-li said adjustable devices to determine the successive arresting .points of the platen movement in line-spacing direction, and a clutch releasably connecting the platen to ysaid succession of adjustable devices.

3l. In a typewriting machine, thel combination with a platen, of a cylinder con,- ncctecl thereto and provided with a spiral series of peiforations,stops constructed to lit in any of said perforations, means to c ooperate with said stops to determine mechanically the line spacine movements ot' the platen, and a releasable clutch connecting said cylinder to said platen'.v

In af typewriting machine, the combination with a revoluble platen having an axle and a platen frame having ends, of a ratchet wheel mounted at one end of the' platen frame, a crank, a pawl to operate the ratchet wheel, a gear and a helical cam both secured to said ratchet wheel, a pinion loose upon the platen axle and meshing with said gear, a second gear upon the platen axle at said end of the platen frame and rigid with said pinion, a second inion meshing with the second gear, a revo uble barrel mounted "at said end of the platen frame and carrying l carried a helical series of stops, a detent to engage the stops in succession, and means for enabling the cam to move the detent along the barrel at a speed corresponding to the movement ot the barrel, and a clutch, one member ot'. which is rigid with the second gear, and the other member of which is fixed upon the platen axle, said axle movable endwise to release, the clutch.

36. "ln a typewri-ting machine, the' combination with a platen frame having ends and a platen having an axle and revolnbly mounted in said ends, 'of a barrel and pinion secured together and bot/h revolubly mounted between the platen and one end of the platen frame, said barrel having a series of stops, a gear upon the platen axle and in mesh with Saidpinion, a second pinion ixed to said gear and outside of said platen frame, a second' gear in mesh With the second pinion, a ratchet Wheel fixed upon said second gear, a crank having apaxvl to engage the ratchet wheel, a detent to eoperate with stops upon the barrel, said detent releasable by said crank; said barrel and first pinion being xed upon a. sleeve which is revoluble about the platen axle, a clutch-member also y stops, and

by said sleeve, and a cooperating clutch said axle being movable endwise to release the clutch.

37. In a typewriting machine, the com member fixed upon the platen axle,

bination with a platen frame and a platen having an axle, of a barrel and a pinion secured together and both revolubly mounted within the platen frame at one end of the platen, said barrel having a helical series of a gear loose upon the platen axle and in mesh With said pinion. p

38u-In a typewriting machine, the combination with aplaten frame and a platen having an axle,` of a barrel and a pinion secured together and both revolnbb7 mounted Within the platen frame at one end of the platen, said barrel having a helical series ot stops, and a gear loose upon the platen axle u and in mesh with said pinion; a clutch coniprising two members by which one is fixed' to said gear and the other is xed to the platen axle, said axle` being movable endwise to release the clutch.l

JOHN JOSEPH COOPER.

lilitnesses l-l'nnsonnn lVimmms, l i enano lllns'raoo'r'r.

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