US1302169A - Type-writing machine. - Google Patents

Description

A. A JOHNSON.

TYPE WRITING MACHINE.

APPLICATION FILED OCT-3.1917v v I Lwmw, Patented Apr. 29,1919.

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f/MW s 5y is Affor y UNlED errors ennr ornron.

ARTHUR A. JOHNSON, OF LYNDHURST, JERSEY, ASSIGNOR 'IO UNDERWOOD TYPEWRITEB COMPAIIY, OF NEW YORK, N. Y., A CORPORATION OF DELA- TYPE-ITING- ninonrn'n.

I Specification of Letters Patent.

Patented Apr. 2%), 11919.

Application filed October 3, 1917. Serial No. 194,441.

To all whom it may concern Be it known that I, ARTHUR A. JOHNSON,

a citizen of the United $tates, residing in- Lyndhurst, in the county. of Bergen and State of New Jersey, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a. specification.

My invention relates to typewriting machines, and is herein disclosed as 'ap-phed to an Underwood typewriting machine having a carriage, which comprises a number of features similar to the Underwood fanfold typewriter, in which the typewriter carriagecarries an extension adapted to preserve the proper alinement of the carbon sheets and the fan-fold web, and also is adapted to fasheets in a round platen machine of the front-strike type,.-owing to the fact that.

when carbon sheets lie between' work-sheets, the adhesion is sufficient to prevent the sheets from being moved to any large extent relattively to each other, because the curve in all ordinary trontstrike typewriting machines covers too great and too sharp an arc to permit this. Such diiiilculty of readjusting the carbon sheets becomes prohibitive with even a smaller are if the carbon sheet has made impressions on the work-sheet, since the making of such impressions results in some adhesion between the carbon sheet and worksheet. These difliculties in still smaller arcs are increased with the number of carbon and work-sheets which lie around the latenat any given time to such an extent t at when as many as threecarbon sheets are employed the carbon sheets are practically locked'to the other sheets, unless almost stretched straight.

According to my invention, the carbon.

' sheets may be led in between a plurality of sheets, such as the various plies which make up the ordinary fan fold web, andthe carbon sheets may be led out from between such work-sheets, both the leading in'and leading out belng done at points where the worksheets are substantially straight. This permlts me. to adopt a structure which will enable the carbon sheets to be in the form of loops or endless or continuous belts, which have bights reaching into the fan-fold web travelingalong with it, then reaching out from the fan-fold web and traveling back to thepoint of rentering, with the result that a loop or belt will take care of itself during any ordinary days or weeks writing,.w'ithout any need of manual manipulation of the carbon sheets, and there need be no occasion for swinging up the platen. To accomplish this and-other results, I preferably use an I extension on the rear of the typewriter car riage analogous to the extension used in the Underwood fan-fold typewriters, so that the fan-fold web comes forward over said exten- S1011 substantially horizontally, and while horizontal has the carbon sheets led into it by suitable turning devices, such as V-sha ed plates. The carbon sheets and the fanold web then travel along together around the platen of the typewriter and up in front of the platen, at which latter point a second set ofcarbon-turners or guides or ii-shaped plates may lead the. carbon sheet away from the web, so that thelatter may. be then torn I off without any danger of tearing the carbon sheet.

To provide forthis tearin ofi, there may be a knife above the platen ormin part of a frame adapted to support the car. on-sheet guides. To' permit easy threading of the carbon sheets, especially when insertin a continuous band into the folds of the 'anfold web, the typewriter platen may be re.- movable, and suitable holding devices for the web may be provided.

Other features and advantages will hereinafiter appear.

In the accompanying drawings,

Figure 1 v is a perspective view of an Underwood typewriting machine carriage, showing my invention as applied thereto.

Fig. 2 is a detail, showin how the platen may be removably mounted 'speots, of the ordinary Fig. 3 is a pore ective'view, showing the course of the we and carbon sheets 1n Fig. 1.

Fig. 4 is \a detail of one form of edge for a carbon sheet.

The typewriter carria e 1 is, in many renderwood form, including a frame 2 and a platen 3; the latter journaled in the ends 4 and 5 of the frame on an axle 6, and adapted to be rotated by the usual line-space mechanism, which comprises the handle 7. Behind the platen is the usual paper-table 8 having extensions 9, which come under and around in front of the platen to form guides. Also associated with the platen are the front and rear feed rolls 10 and 11 provided with the usual release mechanism, which includes a shaft 12 and a handle 13 for. operating it. As the typewriter travels along the main frame of the where it is adapted to be written on by the usual types 21. r

The fan-fold web 17 includes a top ply or sheet 22, a bottom sheet 23, a top intermediate sheet 24 and" a bottom intermediate sheet 25, all of which are usually provided with nearly identical forms of a given definite length which are to be filled out; the original 23 by the type 21, and the other copies to be filled out by carbon impressions made while the type 21 strikes on the origi: nal 23. Between the cross-bar 16 and the second cross-bar 19 the fan-fold web 17 passes angle- plates 26, 27 and 28, which are adapted to guide carbon sheets 29, 30 and 31 in between the plies 22, 23, 24 and 25 of the fan-fold web, so that the aforesaid carbon copies may be made. Since the fanfold sheet has some of its folds 29 at one edge and some at the other, the angle plates have to becorrespondingly positioned, with the result that the plate 26 guides the carbon sheet 29 between the plies 24 and 25. The angle plate 27 guides-the carbon sheet 30 between the plies 22 and 24, while the angleplate 28 guides the carbon sheet 3-1 between the plies 2'5 and 23. In order to do this guiding effectively, said angle plates are each provided with an extension 32, which is adapted to engage a pin 33 or 34 fast on the side bars 15 or 14. The angle plates are further steadied by pins 35 and 36 also fast to said side bars; each pin adapted to engage and fit closely in a cor-- responding hole in the extension 37 of the angle plate.

In order to properly introduce the carbon sheets, the angle plates 26, 27 and 28 are each provided with a face 38 set at an angle of 45 to the line of travel of the fanfold web 17, said face 38 lying toward the outer side of the typewriter carriage extension; and the angle plates are also provi'ded with a second face 39, also at an angle of 45? to the line of travel of the web 17, and adapted to turn the course of a carbon sheet-coming over the angle plates 26, 27 and 28 at right angles yto the line of travel of the web 17, so that after passing the face 39 the carbon sheet will travel smoothly in line with the web 17.

(When all three carbon sheets 29, 30 and 31 are properly threaded over the angle plates 26, 27 and 28, so that they all turn the face 39 properly, the carbon sheets and the fan-fold we'b will fit smoothly, around the'platen past the printing point opposite the position of the type 21 in Fig. 3, and then the fan-fold web and the carbon sheets, in passing upward, encounter a seco (1 set of angle plates 40, 41 and 42, each of hese being provided with an edge 43 set at an an le of 45 to the line of travel of the We If the Web is properly threaded between the plates 40, 41 and 42, the edge 43 will lie adjacent each carbon sheet, with the result that each carbon sheet can be turned around the adjacent edge 43 and led out at right angles to the'line of travel of the' web toward the end of the typewriter carriage.

The web 17 travels on upwardly behind aknife 44, which is supported on standards 45 and 46 rising from opposite ends of the usual frame, in which the platen 3 is more or less directly journaled. The standards 45 and 46 are inclined somewhat rearw'ardly so that the web 17, as it travels upward toward the knife 44, has .a rearward slant, making it easy to read. characters thereon.

Behind the knife 44and' spaced therefrom by spacingblocks 47, but firmly attached thereto and to the standards 45 and 46, is a cross-bar 48 adapted to support the rear side of the web, and] carrying an 'up- Ward extension 49 forming a supportffor an adjustable end gage 50 of a type common fan-fold machines. With this structure, the knife 44 forms a convenient edge along which to tear off the web 17, and by setting the end gage 50 at the 'right height, the operative need pay no attention to measuring by the eye the point at which the-web 17 is tobe adjusted along the knife 44, but the position of the gage 50 will enable the end of the web 17 to be positioned thereagainst by feeling and then the web to be torn ofi. The angle plates 40, 41 and 42 are advannaoauee out to enable continuous belts of carbon sheets to be adjusted therearound. To enable the angle plates 40, 41 and 42 to be thus mounted, there is provided a threaded thumb-screw 51 adapted to be insertedin a threaded opening 52 near the top of the angle plates 40, 41 and 42 and this thumbscrew is adapted to pass through. openings in thean le plates. To enable these angle 4 plates to e spaced with their faces apart from each other, the screw51 is adapted to pass through spacing collars '54,.wh1ch are of such a length that the plate 41 is spaced;

away from the support 46 on which it is mounted, The plate 40 is spaced slightly behind and clear of the plate 41, and the plate 42 spaced behind both the plates 40 and 41, with the result that the web 17 may have a plate between each of its folds adjacent the carbon sheet within that fold.

In order to steady the lower ends of the angle plates 40, 41 and 42, they are provided with extensions 55, through which thumb-screws 56 are adapted to pass, said thumb-screws also being provided with spacing collars 54 to preserve the same spacing at the bottom as at the top of the angle plates 40, 41 and 42. The outer ends of the angle plates 40, 41 and 42 maybe steadied by horizontal extensions 57 projecting from the bases 58 by which the standards 45V and 46 are attached to the platen frame. 'In addition to the internal 45 edge 43, the angle plates 40, 41 and 42 have external edges 59 about which the carbon sheets are adapted to be turned to lead the carbon sheets downwardly.

Rolls 60 journaled in ears 61 on the extensions 57, and in ears 62 on the standards 45 and 46, are provided below the bottoms. of the angle plates 40, 41 and 42 to permit the carbon sheets to be guided therearound,

so that after coming down across the faces of the plates 40, 41 and 42, the carbon sheets I may extend rearwardly along their bights 63, seen in Fig.3. The rearwardly exltending bights 63 of the carbon sheets then turn around the 45 faces 38 of the. angle plates 26,27 and 28, which are adapted to turn the sheets horizontally toward the center of the carriage, with the result that'they will. be able to turn around-the faces 39 and feed along again with the web 17. In order to keep the plates 26, 27 and 28 spaced. apart from each other, there may be provided suitable spacing sleeves 65, through which the pins 33, 34, 35 and 36 pass. v

The carbon sheets in an ordinary fan-fold machine are usually sufficient for. a days writing, and since a carbon beltfor use in the present lnventlon 1s upward of SIX times as long as that used in the fan-fold machine,

written on, while the form written previously to that one has been torn off by the knife 44.

The carbon sheet or belt may be advantageously strengthened, as diagrammatically shown in Fig. 4, by having a reinforcing strip 66-embracethe sheet 67 proper. The carbon sheet or belt may advantageously be in the form-of an exceedingly thin carbonized fabric having a silky feeling, such as is now obtainable on the market. of the carbon'bel-t may be united in any suitable manner. It will sometimes be found advantageous to break joints (see 64) Where the carbon sheet has the binding 66 around it. This will result in having a sheet which is strengthenedby the binding 66 at the point where it is Weakest from its own joint.

If the platen of thetypewriter is made removable, asillustrated in Fig. 3,-it is unnecessary for the typist to make any joints in the carbon sheet, but may utilize any continuous carbon Sheet Whi-ch is available and of the right length. The length advantageously is such that in passing around the platen a second time, the line of writing on thecarbon sheet will not coincide with the line of writing which was written on at the first time, for reasons well known to those accustomed to using carbon sheets.

In order to remove the platen, the structure as shown in the patent to Gruner, No. 1,177,031, dated March 28, 1916, may be-utilized, in which the platen axle is interrupted near the end plate 68 of the platen frame, and ends in a tongue 69 adapted to enter a corresponding recess 70 in a stub shaft 71, slidably journaled in the end plate 68. In order to hold the platen normally in place, the stub shaft 71 is held so that the projecting ends 72 thereof on the opposite sides of the recess 70 lie within the platen, this being accomplished by causing a keeper 73 to enter .a slot 74 in the axle. This keeper. is rotatably pivoted on a bracket extending from the frame 68, and is adapted to be thrown intoand out of effective position by a handle 7 5 mounted on a ivot 7 6 and connected by a link 77 to sai keeper, thus'enabling the keeper to be lifted clear ofthe platen axle; with the result that when this isdone, the platen axle can'be slid endwise and then the paten lifted from the stubshaft, the platen'for this purpose having a somewhat similar stub shaft and a tongueand-groove connection at the opposite end.

When the platen is removed, a carbon The ends sheet may be laid around the bottom angle plate 28, the plate for this purpose being lifted clear from one of its pins, and then the carbon sheet may be threaded around fixed plate, and, in fact, it is only in turning the rollers 60 that the carbon faces touch i anything except the work-sheet. In order to enable any carbon sheet to pass around its roller 60,- said roller is removable, and for this purpose'is slidably journaled at 78 in the adjoining upright 45 or 46, and has its outer axis 79 journaled in a slot 80 in the ear 61, and is held in the slot by a spring, past which it can be sprung when being removed. 7,

In order to form a guide for the free end orfree ply of the web 17, which might otherwise fall behind the plate or bar 48,,the lower end of the plate 48 is extended downwardly, as shown at 82, to form a. guide therefor. In machines adapted to use thin work-sheets, it may be found advantageous to carry said ide 82 downwardly as, far as it can conveniently be carried without serious ly interfering with the operation of threading the carbon sheets or belts around the angle plates 4:0, i1 and .42. Ihe guide 82 may extend rearwardlyv also, if desired, for the same purpose. The plates 40, n and 42 and the extension 82 therefore, practically form guides for the work-sheets forming the web .17, is it rises upwardly from the platen.

In order to enable the work-sheets tolie as snugly as possible'against the knife t4, the opening between. the knife 4:4 and the bar I8, while wide enough to allow easy slipping of the work-sheets, should not be wide enought to allow the work-sheets to fall into deep bends therein. I

While one method of threading the carbon sheets or belts has been described, various typists will undoubtedly find that other methods of threading them come naturally to them, but ingeneral it will be found advisa'ble to always thread the sheets in substantially the same manner so as to cultivate a proper habit of doing the work, with the result that it can be done more rapidly after a little practice.

In order to facilitate the threading of the carbon sheets and the web, the locking arm 20 may be swung down to catch the margin of the web (or carbon) against the crossbar 19, said arm for this purpose being pivoted on the side-bar 15,.and having a spring 83 which is adapted to hold it at the limit of its throw in each direction.

A stop 86L limits the throw of the arm 20 away from the bar 19. To prevent the carbon sheet from running into folds, the 45. edges of the angle plates 26, 27, 28, 40, 41, 42 may be slightly crowned.

Variations may be 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 1. In a typewriting machine, the combina tion with a traveling carriage and a rotating platen thereon, of means for guiding worksheets around said platen, means for guiding separate sheets in between said worksheets at points near the platen, and means for automatically removing said last-named sheets after the whole body of sheets has passed together around the platen.

12. In a typewriting machine, the combination with a traveling carriage and a rotating platen thereon, of means for guiding work-sheets around said platen, means for guiding separate sheets in between said work-sheets at points near the platen, means for automatically removing said last-named sheets after the whole body of sheets has passed together around the platen, and a knife adapted to sever the sheets from which said sheets were removed.

removing said carbon sheets from between said work-sheets when the work-sheets have passed beyond the printing oint, a knife adapted to sever said work-s eets after the.

carbon sheets have been removed from therebetween, and a gage beyond the knife adapted toform a limiting stop for the end of said work-sheets to measure the point at which they are severed by said knife.

4. In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of means for holding work-sheets against said platen, angle plates adapted to feed carbon sheets in between said work-sheets and having an edge at an angle to ermit carbon sheets to be fed to said work-s eets in a line parallel to the travel of said platen, and" a second set of angle plates extending between said worksheets beyond the printing point at the platen and comprising an edge at an angle adapted to lead carbon sheets away from said work-sheets.

-5. In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of means for holding work-sheets against said platen, angle plates adapted to feed carbon sheets in between said work-sheets and having an edge at an angle to permit carbon sheets to be fed'to said work-sheets in a line parallel to the travel of said platen, a second set of angle plates extending between said work-sheets beyond the printing point at the platen and comprisingan edge at an angle adapted to lead carbon sheets away from said work-sheets, a knife above said last-named angle plates adapted to form a severing edge or severing the work-sheets, and a gage beyond said knife adapted to indicate the point at which said work-sheets will be severed by said knife.

6. In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of devices for causing work-sheets to feed around said platen, an extension in the rear of said platen adapted to convev a continuous work-sheet to said platen, angle plates on said extension adapted to convey carbon sheets in between said work-sheets, a second set of angle plates extending between said work-sheets beyond the printing point at-said platen, adapted to lead said carbon sheets away from said work-sheets, and supporting means adapted to hold said work-sheets while said carbon tatable platen therein, of devices for causing fan-fold work-sheets to feed around said platen, edge guides for said fan-fold worksheets as they approach the platen, angle plates extending into said fanefold sheets adapted to convey carbon sheets therebetween and to turn them to move parallel to said fan-fold sheets; angle plates beyond the printing point of said platen adapted to divert said carbon sheets from said fan-fold sheets, and a severing device adapted as sever said fan-told sheets. y

l 8. In a typewriting machine, the combination with a traveling carriage and a rotating platen thereon, ofsmeans for guiding work-sheets around said platen, means for guiding separate sheets in between said work-sheets at points near the platen, means for automatically removing said last-named sheets after the whole body of sheets has passed together around the platen, and means for guiding said separate sheets after being removed back into'position to be again guided between said work-sheets.

9. In a typewriting machine, the combination with a'traveling carriage and a rotating platen thereon, of means for guiding work-sheets around said platen, means forguiding separate sheets in between said work-sheets at points near the platen, means for automatically removing said las' named sheets-after the Whole body of sheets has passed together around the platen, la knife adapted to sever the sheets from whlch said sheets were removed, and means for guiding said separate sheets after being removed back into position to be again guided between said work-sh'eets.

10. In a typewriting machine, the combination with'a traveling carriage and a rotatable platen therein, of devices adapted to cause work-sheets to feed around said platen, devices adapted to'feedcarbon sheets in between said work-sheets, so that the carbon sheets and the work-sheets feed together around the platen, means for automatically removing said carbon sheets from between said work-sheets when the work-sheets have passed beyond the printing point, a knife adapted to sever said work-sheets after the carbon sheets have been removed from therework-sheets to measure the point at which a they are severed by said knife,- and means for feeding said carbon sheets after being removed back to the devices adapted to feed the carbon sheets between the work-sheets.

11. In a typewriting machine, the combination with a traveling carriage and a r0 tatable platen therein, of means for holding, worksheets against saidplaten, angle plates adapted to feed carbon sheets in between said work-sheets and having an edge at an angle to permit carbon sheets to be fed to said work-sheets in a line parallel to the travelof said platen, a second set of angle plates extending between said work-sheets beyond the printing point at the platen and comprising an edge at an angle adapted to lead carbon sheets away from said worksheets, and means for feeding said carbon sheets after being removed back to the devices adapted to feed the carbon sheets between the work-sheets.

12. In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of means for holding work-sheets against said platen, angle plates adapted to feed carbon sheets in between sheets, a knife above said last-named angle plates adapted to form a severing edge for severing the worksheets, a gage beyond said knife adapted to indicate the point at which said work-sheets will be severed by said tending between said work-sheets beyond the printing point 'at said platen, adapted to lead said carbon sheets away from said 'Work-sheets, supporting means adapted to hold said work-sheets while said carbon sheets are being so diverted and after they are diverted, and means for feeding said carbon sheets after being removed back to the de- "ices adapted to feed the carbon sheets between the work-sheets.

14. In a typewriting machine, the combi nation with a traveling carriage and a r0- tatable platentherein, of devices for causing fan-fold work-sheets to feed around said platen, edge guides for said fan-fold worksheets as they approach the platen, angle plates extending into said fan-fold sheets adapted to convey carbon sheets therebetween and to turn them to move parallelto said fan-fold sheets, angle plates beyond the printing oint of said platen adapted to divert said carbon sheets from said fan-fold .sheets, a severing-device adapted to sever said fan-fold sheets,-andmeans for feeding said'carbon sheets after being removed back to the devices adapted t6 feed the carbon sheets between the work-sheets.

15. In a typewriting machine, the combination with atraveling carriage and a rotatable platen therein, ofan extension extending rearwardly from said carriage adapted to guide work-sheets to the platen,

devices adapted to guide other sheets between said work-sheets from a direction parallel to the line of'travel of the carriage,

another extension on said carriage extending upwardly therefrom adapted to guide said other sheets away from said worksheets, and comprising holding means adapted to hold the written work-sheet in view of 'the typist, and a knife for severing said work-sheets.

In a typewriting machine, the combinatlon with a, traveling carriage and a ro- 'tatable platen therein,- -of an extension extending rearwardly from said carriage adapted to guide work-sheets to the platen, an angle plate adapted to guide a carbon sheet in between said work-sheets from one' side, a second angle plate adapted to guide a carbon sheet in from the other side, an extension mounted on said carriage adapted to lead the written work-sheets away from the platen, an angle plate adapted to lead a carbon sheet away from the work-sheets'on the side from which it approached the work sheets, and a second angle plate adapted to legd a carbon sheet away onfthe oppositev s1 e.

17. In a typewriting 'machine, the combination with a traveling carriage and a rotatable platen therein, of an extension extending rearwardly from said carriage adaptedto uide Work-sheets to the platen, an angle p ate adapted to guide a carbon sheet in between sald WOI'kvShGGtS from one side, a-second angle plate adapted to guide a carbon sheet in from the other side, an extension mounted on said carriageadapted to lead the written work-sheets away from the platen, an angle plate adapted to lead a carbon sheet away from the work-sheets on the side from which it approached the worksheets, and a second angle-plate adapted to lead a carbon sheet away on the opposite side, each angle plate also comprising a second angle, so that a carbon sheet may be led. back from the last-named angle plates to the first-named angle plates.

-18. In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of anextension ex tending rearwardly from said carriage adapted to guide work-sheets to the platen, an angle plate adapted to guide a carbon sheet in between said work-sheets from one side, a second angle plate adapted to guide 105 a carbon sheet in from the other side, an ex; tension mounted on saidcarriage adapted to lead the written worksheets away from the platen, an angle plate adapted to lead a carbon sheet away from the work-sheets on the side from which it approached the worksheets, a second angle plate adapted to lead a carbon sheet away on the opposite side, each angle plate also comprisin a second angle, so that a carbon sheet may e led back a from the last-named angle plates to thefirst named a'ngleplates, and means for support ing and measuring the work-sheets after the carbon sheets have been removed therefrom. 19. In a typewriting machine, the combination with a traveling carriage and a r0- tatable platen therein, of an extension extending rearwardly from said carriage adapted to guide-work-sheets to the platen, detachable angle plates mounted on said rearward extension adapted to permit carbon sheets to be led in between said worksheets, an upward extension of said carriage,

Leoaieo and detachable angle plates mounted 011 said upward extension adapted to guide said carbon sheets away from said Work-sheets.

20. Ina typewriting machine, the comb-ination with a traveling carriage and a rotatable platen therein, of an extension extending rearwardly from said carriage adapted to guide work sheets tothe platen,

detachable angle plates mounted on, said rearward extension adapted to permit carbon sheets to be led in between said work sheets, an upward. extension of said carriage, anddetachable angle plates mounted on said upward extension adapted to guide said carbon sheets away from said worksheets, certain of said angle plates adapted to lead carbon sheets to and from the worksheets on one side, and others of the angle plates adapted to lead the carbon sheets to and away from the work-sheets on the other side.

21. In a typewriting machine, the combination with a traveling carriage and a rothe front sides of carbon sheets whose back ward extension, angle plates for said lastnamed pins adapted to be removably held thereon, so that fan-fold work-sheet may be drawn forwardly with the angle plates projecting well toward the bottom of, its folds,

and guides for said fan-fold work-sheet.

23. In a typewriting machine, the combination with a traveling carriage and. a rotatable platen therein, of a rearward extension of said carriage, pins mounted on said extension, angle plates removably mounted on said pins, an upward extensi-onof said carriage, a second set of pins upon said upward extension, angle plates for said last-named pins adapted to be removably held thereon,

so that a fan-fold work-sheet may be drawn forwardly with the angle plates projecting well toward the bottom of its folds, guides for said fan-fold work-sheet, a knife above the front angle plates, and a gage beyond said knife adapted to serve to measure the length of work-sheet to be severed by said hi e.

24:. In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of a rearward extension of said carriage, pins mounted on said extension, angle plates removably mounted on said pins, an upward extension of said carriage, a second set of pins upon said upward extension, and angle plates for said last-named pins adapted to be removably held thereon, said platen being removable to permit an endless carbon sheet to be threaded around said angle plates and said platen.

25. Inia typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of a rearwardextension of said carriage, pins mounted on said extension, angle plates removablymounted on said pins, an upward extension of said carriage, a second set of pins upon said upward extension, angle plates for said last-named pins adapted to be removably held thereon, said platen being removable to permit an endless carbon sheet to be threaded around said angle plates and said platen, a clamp adapted to hold any sheet while being so threaded, and rolls adapted to bear against the faces of the carbon sheets, so that only the backs of the carbon sheets bear against said angle plates.

26.' In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of a rearward extension of said carriage, means on said extension adapted to removably support angle plates projecting alternately from the opposite sides of said extension, a second extension of said carriage projecting nearly upwardly, and thumb-screws and collars adapted to support angle plates projecting alternately from the opposite sides of support, so that all said angle plates may extend into the folds of a fan-fold web.

, 27. In a typewriting machine, the combination with a traveling carriage and a rotatable platen therein, of a rearward exten sion of said carriage, means on said extension adapted to removably support angle plates projecting alternately from the opposite sides of said extension, a second ex- 'tens'ion of said carriage projecting nearly upwardly, thumb-screws and collars adapted to support angle plates projecting alternately from the opposite sides of said second extable platen therein, of means for holding work-sheets against said platen, an angle plate adapted to feed a carbon sheet in be tween sald work-sheets to permit the carbon sheet to be fed with said work-sheets in a line parallel with the axle of the platen, a second angle plate extending between said work-sheets beyond the printing point at the platen, to lead the carbon sheet away from the work-sheets, a guide to carry the carbon sheet back to the first plate so that a continuous carbon sheet belt may be employed,

and an axle for said platen having an interruptible portion to permit the bight of 10 the belt to be inserted between said platen and said holding meansl.

ARTHUR A. JOHNSON. Witnesses:

CATHERINE A. NEWE'LL, EDITH 1B. LIBBEY.

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