US1583781A - Typewriting machine - Google Patents

Description

May 1,1 1926. 1,583,781

c. M. cREws TYPEWRITING MACHINE Filed June 5,- 1924 4 Sheets-Srheet 1 I ffii M5 May 11 1926.

' j 1 1,583,781 l c. M. cREws A TYPEWRITING MACHINE Filed June 5 1924 4 Sheets-Sheet 2 Affe/wey May 11,1926. 1,583,781"v c. M. cREws TYPEWRITING MACHINE Filed June 5, 1924 4 Sheets-Shet 3 /fi ven far May' 11 1926. 1,583,781

C. Mv. CREWS TYPEWRI T ING MACHINE Filed June 5, 1924 4 Sheets-Sheet 4.

M MM@ Patented May 11, 1926. V

y 1,583,781?-j` UNITED AsTn'rEs PATENT oFF-ICE:

CLARENCE MI.l CREWS, OF BROOKLYN, NEW YORK,.ASSIGNOR TO UNDERWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITNG MACHINE.

Application led June 5, 1924..` Serial No. 717,920;

This invention relates to typewriting of the class known as, continuous billing, in which class ofV Work a multiple ply continuous work-web ordinarily is interleaved with carbons carried by a carbon-carrier that is advanceable toward the platen at line-feeding and retractible to eect relative shifting of the work-Web and carbons upon displacement of theplaten.

The present invention has certain features in common withv my vpending application, Serial No. 717,009, tiled May 31, 1924. That is, it is an object of the present invention, as in the application referred to, to obviate the displacing of the platen and to eliminate the carbon-carrier altogether.

It is a. further object of the present invention to provide rapid operating means for locating the Work-Web and carbons -nexact carbon-shifting position for clamping the carbons stationary andfor then effecting a mechanically measured shifting of the Work-Web relatively to thel carbons, whereby the shifting may be effected quickly and accurately, and Without reliance upon the operators observation of the Work-Web and the carbons. y

In attaining the above-mentioned objects, use is made of discrete carbons of substantially greater Width than the .Work-Web,v which carbons are preferably interleaved with the work-Web in such manner that they protrude at both side; margins beyond the sides of the Work-Web. The carbons are unattached to the machine, and arel fecdable by and with the .Work-Web upon rotation of the platen. -When, at the conclusion of typing a form, it is desired to effect a relative shift between the Work-Web and carbons, the platen is rotated backward to feed the carbons to a definite carbon-shifting position in which they are straight and free of the, platen at the rear thereof. Provision is made of means to clamp the carbons stationary in this carbon-shifting position, While the Work-Web is advanced a form-length by rotation of the platen.

Platen-sweep mechanism is provided for rapidly imparting a mechanically measured, backward rotation to the platen to retract the carbons and the interleaved work-Web from iinal Writing position to carbon-shifting position, and for rapidly imparting av r mechanically measured forward rotation to 5" the platen to advance the Work-web exactly a form length While the'carbons are held stationary by the carbon clamping means. The second mentioned operation of the platen-sweep mechanismeffects a measured relative shift of the Work-Web and carbons, and, in addition, mechanically locates the Work-web for severing. .The platen-sweep- `mechanism Jcomprises a platen-sweep handle which is normally connected to the platen to travel Whenever the platen is rotated, but

which is disconnectible from the platen foi` movement relatively thereto, when desired.

In beginning the Work upon the machine, the carbons are first interleaved `With the second form-section upon the Work-web, and the web and carbons are then introduced into the machine from the rear, the carbons' being brought to theirl carbon-shifting position, and the platen-sweep'handle being located at the rear'limit of its movement. The'platen is then advanced, by the platensweep handle if desired, to feed the Workweb and carbons forward to the first Writ- Y During this backward movement the Workweb and carbons move yin unison. The clamps are applied to clamp the protruding marginsv of the carbons, independently of the Work-web. to detain the carbons stationary and the platen-sweep handle is next drawn forwardqrapidly until arrested in a definite position by an adjustable stop located at a predetermined, measured distance from the fixed rear stop, to produce a relative shift of exactly a 'form-length.

This position of the Work-Web may conveniently beused as a Web-severing position, and the machine is accordingly provided with a web-severing knife, mounted to register with vthe leading edge of the form just typed, in the positionoccupied by it at this stage. ,of the operation. The form-section preceding the one just typed is, therefore, torn ofi1 by the aid of the knife at this time.

The operator next disconnects the platensweep handle from theplaten, moves it to `carbons to the carbon-shifting position.

the rear into engagement with its fixed stop, and there reconnects it to the platen. At this stage, the clamps are moved to ineffective positions and the platen is rotated a short distance toadvarce the carbons and the fresh form-section, with which the carbons have become interleaved by reason of the relative' shift-ing, to rst writingl line position. This completes the cycle of operations which is repeated for each succeeding form-section( In accordance with-y one feature of the invention, provision is made of means, actuated bythe platen-sweep handle, for automatically rendering the carbon-clamps effective and ineffective at the appropriatetimes. To this end, a clamp-controlling member is arranged to be engaged and actuated by the platen-sweep handle in therlast portion of its backward movement, and con-- nections are provided from this member to the clamp to cause the clamp to be rendered alternately effective and ineffective by suc-` cessive actuations of said member.

The arrangement is suclnthat lthe platen-sweep handle, in the last part of its rearward stroke whereby the work-web and carbons' are retracted in unison to carbon-shifting position, actuates the clamp-controlling member to snap the clamps to effective positions, and. in the past part of its other rearward stroke, which is an idle stroke, actuates the member to render the clamps ineffective, so that. the carbons may be -fed forward with the work-web. f

It will be seen that the platen-sweep mechanism accomplishes the relative shifting of the carbons and work-webs very rapidly, and 'that its operation is measured at every stage, so that it is unnecessary for the operator to see'- the position of the carbons, orto observe the relation of the work-web to them, either at the beginning or at the termination of the carbon-shifting operation. The operator, at the conclusionof writing a form section, is required merely to Inove the platen-sweep handle backward against the rear stop, then forward against the adjustable front stdp, then to.tear off the end section of the web, move the handle idly to the rear stop and then yforward a short distance to advance the work to Writing position.

Other features and advantages will hereinafter appear. v

In the accompanying drawings,

Figure 1 is a side elevation, partly broken away, showing the novel mechanism of the present invention and so much of the old mechanism as is necessary to. an understanding ofthe invention.

Y Figure 2 is a diagrammatic side elevation, showing the parts in positions occupied b v them in the course of typing a form-section.

Figure 3 is a front elevation Iof the mecha-l nism shown in Figure 1.

positions occupied by them when typingis effected at the lower end of a form.

Figure 6 is a diagrammatic side elevation, showing the parts'in the positions occupied when the platen-sweep handle has been moved to the rear to locate the carbons in carbon-shifting position.

l F igure 7 is a diagrammatioside elevation,

showingy the parts in web-severing position,

that is, just at the conclusion of a carbonshifting operation.

Figure 8 is a diagrammatic side elevation, showing the parts in the positions occupied after thefend web-section has been severed and the platen-sweep handle has been returned tothe rear, but before said handle has been reconnected to the platen.

The typewriting machine comprises a cy-V lindrical platen 10 journaled by its axle 11 in ends 12 of a platen-frame 134 that is movable in letter feed and ret-urn directions in the usual manner. Feed-rolls 14 co-operate with the platen to feed back and forth a continuous work-web 15 that is led to the platen over a high rear paper-table 16 from a source of supply. x

In beginning the work upon 'theworh- A web 15,. discrete carbons 17 o f greater Width y than the work-web are interleaved with the second form-section thereof in such manner that they protrude at both side margins beyond the sides of the work-web; or, if a fanfold web is used, so that each carbon protrudes at one of it side margins.

introduced into the machine from the rear of the platen and is advanced until the carbons are located in the position shown in Figure 1, which is the carbon-shifting position.

small gear 18 fast upon it which meshes with a larger gear 19A fast upon a shaft 20 journled in a sleeve21 that forms part of a supporting bracketl 22 carried Iby a` baseplate 23 `secured upon the rightv end 1 2' of the platen-frame 13. The shaft20 also has fast upon it a driver wheel 24 havingsharp pointed teeth 25 for interlocking engagement. with sharp pointed teeth 26 of a latch 27 carried by a platen-sweep `handle 28 The workweb 15 with the interleaved carbons 17 is At its right end the platen-axlevll has a4 which is rotatably mounted upon the shaft.

20. A spring 29 connected to the platensweep handle'28 and to the latch 27 normally maintains the latch in engagement with the driver wheel 24 and hence maintains driving connection between the -platensweep handle and the platen.

The latch 27 has elongated slots 30 through which pass the shanks of screws 31 that are threaded into the platen-sweep handle 28 to hold the latch upon the handle but in a 'manner to permit movement of the latch toward and from the driver Wheel 24. When the Work-web and carbons 17 have been brought to the carbon-shifting'position described, the latch 2 7 may be moved longitudinally of the platen-sweep handle 28 Aby means of a finger-piece32 to disconnect the handle from the platen, so that the handle may be moved to the rear until arrested by engagement of a projection 33 uponit with the base-plate 23. The handle 28 in this position is connected to the platen by permitting the s ring 29 to draw the latch 27 toward the river Wheel .24` so that the handle may be actuated to feed-the work forward to typing position, and may be advanced by the plateny at the line-spacing of the Work as the typing proceeds. lVhen the formsection With which the carbons 17 are interleaved has been advanced to typing position and has been typed, the platen-sweep handle is thrust to the rear tovitsinitial position as shown in Figures 1 and 6, and this retracts the work-web 15 and the interleaved carbons lio a definite uniform position.

17 to the position shown inv Figures 1 and 6,..

that is, to their initial position with the f carbons in carbon-shifting position. At this stage, clamps 34 are made effective to grip the protruding side margins of thecarbons 17 at their ends remote from the yplaten to hold the carbons stationary While the work- `web 15 is advanced relatively to them. The

ped from the typed web-section and interleaved with the next section of the web. For the purpose of measuring this relative shifting, provision is made of an adjustable stop 35 arranged to intercept a projection 36 on the platen-sweep handle and to arrest the handle. The\stop 35 is carried by an arm 37 rotatably m'ounted on the shaft 20, that carries a screw 38 which is arranged to be turned to fit between teeth 39 of a segment 40 forming part of the bracket 22. These teeth 39 are located at spaces corresponding to line-space intervals, so that theadvance of the work-web 15 relative to the carbons 17 may be varied in accorda-nce with the length of form used.

The conclusion ofthis relative shifting operation is alwaysthe same, that is, the line of division between the end section of the workweb and the section which has just been typed and stripped from the carbons occupies This position,

therefore, may conveniently be` the webos'ition of the work-web 15 at thel severing position. Provision is made of a lknife 41 which .is mounted on standards 42 extending upward from the bracket 22y and from the left-hand base-plate 23. These standards are provided with threaded openings 43 at equally spaced intervals, any pair of which may be utilized for ,the reception of knife supporting thumb screws 44, so thatv the knife 41 may be adjusted in various positions according to the length of the fornisection used.

An upwardly extending web-supporting finger 45 is mounted upon a cross-bar 46 connecting the standards 42, to hold the web 15 4conveniently near the knife 41, so that the operator may seize it readily, and to prevent the webs passing a second time around the platen. Y'

After the severing of the work-web, the platen-sweep handle 28 is disconnected from the platen by pulling outward on ythe fingerpiece 32 andthe handle is moved to its extreme rear position and there reeonnected vto they platen by releasing the finger-piece.

At-the conclusion of this backward movement of the platen-sweep handle 28 the clamps 34 are made ineffective, to permit the carbons -17 to beV advanced with the workweb 15 to writing position.

Mechanism is provided .for automatically rendering the clamps effective and ineffective at the appropriate times. The clamps 34 are fast upon 'a transversely extending shaft 47. which also. has fast upon it an operating arm 48. A spring 49 conneeted'to the operating arm and to a projection 5 0 on the rear papertable tends always to move the clamps 34. to effective positionl A cam-follower 51 Amount-ed in guides 52 and connected to the arm 48 rides upon the surface of a cam 53 fast to ashaft 54 journaled in brackets 55. l

This cam 53 has alternate high and low parts which are so arranged that the clamps 34 are rendered ineffective when a high part of the cam engages the follower 51 and are permitted to be made effective by thespring 49 when a lou7 part of the cam engages the follower. The cam 53 is rotated step by step .to bring its high and low parts alternately to effective position by means of av ratchet-wheel 56 fast onS the shaft 54.

An oscillatory arm 57 \]oose on the shaft 54 carries a pawl 58 for co-operation ywith the ratchet-wheel 56. The oscillatory -arm 57 also carries a pitman, 59 whichis held by a'guide 60 inthe path of the platensweep handle 28. When the platen-sweep handle 28 is moved to its extreme rear position it engages the pitman 59 on the oscillatory arm 57 to feed the ratchet-wheel 56 one tooth space. This serves to bring a high part ofthe cam 53 opposite the follower`51 if a low part was previously effective, or to bring a low part yopposite the follower if a high part was previously effect-ive.

52 on the rear paper-table.

It will now be understood that when the platen-sweep handle 28 is-flrst moved to the rear to retract the carbons 17 and the workweb together to the position of Figure 6,`

the movement of the pitman by the handle causes the clamps to be made effective. The lcam 53 is so contoured that the sprlng 49 is caused to snap the clamps 34v to effective 1 Y position at the very end of the rearward movement of the platen-sweep handle 2 8. The handle 28 is next drawn forward to advance the work-web while the earbons are held stationary by the clamps 34, and is then disconnected from the platen and returned idly to the rear. At the conclusion of the idle rearward movement of the platen-sweep handle 28, the actuation of the pitman 59 by said handle causes the clamps 34 to be made ineffective (see'Figure 8), so that the carbons 17 may be advanced with the workweb 15 to writing position,

It will be noted that the carbons 17 are drawn entirely clear of -the platen, at the rear thereof, for carbon-shifting, and hence that the leading edge of the work-web section with` which they are interleaved is .drawn a substantial distance below7 the line yof writing. The stop is effective to arrest rotation ofthe platen when the work-web has been advanced exactly a form length from this osition at carbon-shifting. It is desirable, owever,to permit a greater advance of the handle-28 at typing in order to permit typing to be effected near ,the bottom of the form, that is, in order -that the leading edge of the form may be fed fromv carbon-shifting position around to the line of Writing and then advanced substantially a form length from that point. The stop 35 is therefore constructed to arrest the platensweep handle 28 when the handle isl advanced rapidly as at carbon-shifting, but

-tov permit theV handle to pass. it when the handleis advanced slowly as at line-spacing, To this end the stop 35 is pivote-d upon the arm 37 land normally urged in a counter- -clockwise direction by a Lspring a, as

viewed in Figures 1, 5 and 7, tomain- ,tain its nose 61! lclear of the proi' jeetion 36 carried by the platen-swee handle 28. The stop 35has a tail 62 whic extends into the path of a second projection 63 carried by the platen-sweep handle 28. The arrangement is such ythat thesecond projection 63 strikes the tail 62*l at'the advance of the handle swinging the stop .35 clockwise to throw the nose 6I Intov the path vbase-plates.

of the projection 36 (see Figure 7). If the 3 handle 28 is being advanced rapidly, the I so that the line-feeding of the work can be continued to the bottom of the form.

The knife-supporting standards 42 are y.sr-.pported at their lower ends upon the forward ends of the base-plates 23, and are additionally supported by brackets 64 extending upward from the rear ends of said The standards 42 are'further combined with the rear 'paper-table 16, to form a rigid truss therewith, by means .of webbing `65. In this way, the standards'42 and the paper-table 16 are caused to brace one another.

Ithas been pointed out that the stop 35 may be adjusted by line-space units as determined by the lusual line-space ratchetwheel66 and co-operating detent 67. Since the platen will always be advanced, therefore, a whole number of line-spaces, .the detent 67 will help to detain the platen sta'- tionary during the idle backward movement of the handle, and the handle can be connected to the platen when at the rear limit of its movement without tion of the platen at all.

valtering the posi- 1 0 The form can be varied in length Within y a widerange so long as it is of alength equal toa whole number of line-spaces.

Since a distance of two form-lengths intervenes betweemtherear ends of the carbons in carbon-shifting position vand the knife, the. provision' of o enings 43 at' double-line-space intervals or' the attachment of the knife will accommodate single-'line-space variations in the length of form used.

' Variations may be resorted to within the scope of the invention, and portions of the llO improvements may be used without others. Hrw-'mg thus described my lnvention, Inl

claim: v

1. In a ycontinuous billing typewriting machine, the combination with a revoluble platen, of a. set of discrete carbons feedable around the platen with an interleaved workweb, means for holding the earbons stationary in a' definite predetermined carbon-shifting position where-1n they are straight and free of the platen, means for sweeping the platen forward and backward, means for limiting the backwardv sweep of the platen to arrest the work-web and carbons in carbon-shifting position, and means for limiting the forward sweep ofthe platen to arrest' the work-web when it has been advanced a lthe work-web at the conclusion of said forward sweep of the platen.

predetermined distance from the carbonshifting position.

2. In a continuous billing typewriting machine, the combination with a revoluble platen, of a set of discrete carbons feedable around the platen with an interleaved workweb, means operable to clamp the carbons stationary in a. definite predetermined carbon-shifting position wherein they are straight and free of the platen, means for sweeping the platen forward and backward, means for limiting the backward sweep of the platen to arrest the work-web and carbons in exact carbon-shifting position, means v for limiting the forward sweep of the platen to arrest the work-web when it has been advanced exactly a form length fromv the .carbon-shifting position, land a web-sever- -ing knife located to register with.' the line of division between two form-sections on 3. In a continuous billing typewriting machine, the combination with a revoluble platen, of a set of discrete carbons vfeedable around the platen with an interleaved work- -web, means for holding the carbons stationary in a definite predetermined carbon-shiftzing position wher-ein they are straight and free of the platen, means for .sweeping 'the platen backward tov locate the workweb and carbons in carbon-shifting position, and for sweeping the platen forward to effect a v .relative shift of the workweb and carbons,

means for. limiting the backward sweep of the platen yto arrest the work-web and carbons in exact carbon-shifting position, means for dlimiting the forward sweep of the platen to arrest the work-web when it 'has been advanced exactly a form length from the carbon-shifting position, and means operable to disconnect the platen-sweep means from the platen to permit retraction of said means independently of the platen, following the carbon-shifting sweep of theplaten.

4. In a continuous billing typewriting ma.- chine, the combination with a revoluble platen, of a set of discrete carbons feedable around the platen with an interleaved Work-y web, means for holding the carbons stationary ina denite carbon-shifting position wherein they are straight'and free of the Y platen, meansfor sweepingthe platen backward to locatel the worklweb and carbons in a definitepredetermined carbon-shifting .position, and -means operated by said platen.- sweepin means to clamp the' carbons independentvy 'of the work-web to hold them stationary in carbon-shifting position while .the work-web is advanced relatively to them. 5. Ina continuous billing typewritig machine, the combination with a revoluble pla-ten, of a set of discrete carbons feedable around the platendwith aninterleaved work- Xabi-meander ,retatingfthe'Pleeiabaakwd to locate the Work-web and carbons in -a d enite predetermined carbon-shifting position, and for rotatlng the platen forward to advance the work-web for shifting it relatively to the carbons, clamping means oper-` able/ prior to the relative shift of the workweb and carbons 'to clamp thecarbons stationary, and operable after such relative shift to release the carbons, and mechanism ope-rated by the platen-rotating means to control the effective and ineffective condition of said clamping means. Y. 6.A In a continuous billing typewriting machine, the4 combination with Aa ,revoluble platen, of aset-of carbons feedable around 'i the platen with an interleaved work-web. means for clamping the carbons stationary in a definite carbon-shifting position wherein they are straight and free of the platen, and a single platen-sweep handle connected to sweep the platen backwardto locate the work-web and carbons 'in carbonfshifting position, and tosweep the platen yforward to effect' a relative shift of the work-Weband carbons.l L

7. In a continuous billing typewriting machine, the' combination 'with 'al revoluble platen, of a -set of` carbonsffeedable around the platen with an interleaved work-web,

means for clamping the carbons stationary in a definite carbon-shifting position wherein they are straight and free of theiplaten, a' single platen-sweep handle connected to sweep the platenxbackward tolocate the work-'web 'and carbons `in carbon-shifting position, and to` sweep the platen forward to effect a relative shiftof the work-web and carbons, and means operated bythe platensweep handle'in said backward platen'- svveeping -movement to make the carbonclamping means effective.

8. lIn av continuous'billing typewriting machine, the combination with a revoluble platen', ofl a set of discrete carbpnsfeedable 1 around the platen withan interleaved workweb, means for imparting a mechanicallymeasured movement` to the work-web and carbonsl to feed' them together from final writing position to a definite predetermined' platen-sweep handle movable-from a mechanf' ically-limited rear-l position'tol av'mechancally-limited forward position for imparting a meclianically-measured forward move- ,mentv tothe Vwork-web independently of the Gerbens,-vhle-thearb 11a-@rah ldtation aryy bythe carbon-clamping means, the` platen-sweep handle being disconnectible from the platen and movable idly from said forward position to said rearward position following the measured feeding of the workweb, and means operated by the idle rearward movement of the platen-sweep handle to release the carbons from said clamping means.

10. In'a continuous billing typewriting machine, the combination with a revoluble platen, ofa set of carbons feedable around the platen with an interleaved work-web, means for holding the carbons stationary in a definite. predetermined carbon-shifting position while the work-web is advanced relaL tively to them, a yplaten-rotating handle for moving the work-web and carbons from final writing position to carbon-shifting position,

and a stop for limiting the movement of the platen-rotating handle to the carbonshifting position, the handle 'being connected to the platen to be advanced by at linespacing of the work, so that the return of the handle to the. stop, will always return the work-web and carbons to the position originvally occupied by them with the handle at the stop.

11. In a continuous billing typewriting machine, the combination with a revoluble platen, of a' set of carbons feedable around the platen with an interleaved work-web,

A web.

means for holding the carbons stationary in. a definite predetermined carbon-shiftnig position while the work-web is advanced relatively to them, and a platen-sweep handle for rotating the platen to feed the workv web and carbons from final writing position to said carbon-shifting position.

12. In a continuous billing typewriting machine, the combination with a revoluble platen, of a set of Vdiscrete carbons, means to conductv the -carbons and an interleaved jwork-web to-the platen from the rear therey is advanced relatively to them, means for detaining the carbons stationary during such Y relative advance of the work-web, and means for measuring said advance of the work` 13. In' continuous billing typewriting machine,'the combination with a revoluhle platen, of a set of discrete carbons feedable around the platen with an interleaved workweb, means for imparting a mechanically' measured movement to the work-web and carbons in one direction to feed them together from final writing positionl to a. deliuite predetermined carbon-shifting position and for imparting a mechanically measured movement vto the work-web in the opposite direction to edect a relative shift between the work-web and carbons, and means for clamping position during the latter movement of the work-web.

14. In a continuous billin typewriting machine, the combination Wit a revolublev platen, ofl a set of discrete carbons feedable around the platen with an interleaved work- Web, means operable to clamp the carbons stationary in a definite predetermined carbon-shifting position wherein they are straight and free of the platen, means for sweeping the platen forward and backward, means for limiting the backward sweep of the platen to arrest the work-web and carbons in exact carbon-shifting position, means for limiting the forward sweep of the platen to arrest the work-web when it has been advanced exactly a form length from thecarbon-shifting position, a web-severing knife located to register with the line of divisi-on between two form-sections of the work-web at the conclusion of said forward sweep of ysweeping the platen forward and backward,

means for limiting the backward sweep of the platen to arrest the work-web and carbons in exact carbon-shifting position, means for limiting the forward sweep of the platen to arrest the work-webwhen it has been advanced exactly a form length from the carlbon-shifting position, a web-severing knife located to register with the line of division between two form-sections on the work-web at the conclusion of said forward sweep of the laten, the means for limiting the forward) sweep of the platen being adjustable to change the extent of forward sweep by any-whole number of line-spaces, and means for adjusting the knife at double line-space intervals to correspond with the adjustments of said sweep-limiting means.

16. In a continuousbilling typewriting machine, the combination with a revoluble platen, of a` set of carbons` means for locating the carbons and an interleaved work-web in a definite predetermined carbon-sh1ft1ng position at a substantial distance from the writing line of the machine, means for structedto arrest the platen-sweep mechanism at the rapid advance of the'platen when the Work-Web has been swept forward a form length, but to permit the Work to be advanced* more than a form length from carbon-'shifting position When the platen is advanced slowly at typing.

17 .In a continuous billingv typeWriting machine, the combination with a revoluble platen, of a set ofv carbons, means for locatjing thel carbons and an interleaved Workveb in a definite predetermined carbon-shifting posit-ion, means' for detaining the carbons in said position While the Work-Web is advanced relatively to them,- platen-sweep mechanism for advancing the Work-Web relatively to the carbons, and means for 'arresting the platen-sweep mechanism when the Work-Web has' been advanced Aa. forni length from carbon-shifting position, said means comprising a pivoted stop, a spring normally holding the stop in an ineffective position, and a tail on the stop enga-geable by the platen-sweep handle to rock the stop to effective position, the arrangement being such that the handlewill engage the stop in effective position when vadvanced rapidly,

but that the spring will restore the stop to ineffective position Without arresting the handle When the handle is advanced slowly.

18. In a continuous billing typewriting machine, the combination with a revolnble platen, of a set of carbons, means for detaining the carbons stationary in a definite carbon-shifting position While the lWork-Web l is' advanced relatively to them, platen-sweep mechanism connected to the platen to sweep it vfor effecting the advance of the work- ,iv'eb relatively to the carbons and alsoadvanceable bythe platen at typing in preparat-ion -forr a measured retraction by the handle of the Worl -Web and carbons together to carbon-shifting position, and

means constructedl and arranged to arrest the advance of the platen-sweep handle at carbon-shifting when the work-Web has been advanced a form length from carbonshifting position, butto permit a greater 4advance of the Work-web and carbons to gcther at typing. e

19. In a continuous billing typewriting machine, the combination with a revoluble platen, of a set of discrete carbons, a platensweep handle arranged to be advanced with f and by the platen at typing, then to be rctracted to return the Work-Web and carbons to a .definite predetermined carbonshifting position, then to be advanced to feed the Work-Web a form length relatively to the carbons, and then to be retracted idly While disconnected from the platen for reconnection to the platen at a different point.l

clamps for holding the. carbons stationary in. carbon-shifting position, and controllingr of the platen-sweep handle to feed thev cam, the arrangement being such that the clamps are made effective by the movement ofthe handle that returns the Work-weh and carbons-to carbon-shifting position andare made ineffective by the idle backward movement of the platen-sweep handle.

20. In a continuous billing typewriting machine, the combination with a revoliible platen, of a set of discrete carbons, a platensweep handle arranged to be advanced with and by the platen at typing, then to be retracted to return the work-web' and carbons to a definite predetermined carbonshifting position, then to be advanced to feed the work-Web a form length 'relatively to the carbons, and then to 'be retracted idly While disconnected from the platen for reconnection to the platen at a different point, clamps for holding the carbons stationary in carbon-shifting position, and means operated by the backward movement of the platen-sweep handle that returns the Work-web and carbons to carbon-shifting position to snap the clamps to effective positions.

21. In a continuous billing typewriting ymachine, the combination with a revoluble platen, of a set of discrete carbons, a platensWee handle arranged to be advanced with and y the platen at typing, then to be retracted to return theivork-iveb and carbons to a definite predetermined carbon-shifting vby the backward movements of the platensweep handle, a ratchet feedable step by step by the pawl,- a cam feedable by the' ratchet, and mechanism controlled by the cam to render the clamps alternately effective and ineffective at t-lie backward movements of the platen-sweep handle.

22, In a continuous billing typevvritingmachine, the combination with, a revoluble platen, of a set of discrete carbons, a platensweep handle arranged to be advanced With andby the platenat typing, then to be retracted to return the work-Web and carbons to a definite predetermined carbon-shifting position, then to be advanced to feed the Work-Web a form length relatively to the carbons, and then to be retracted idly While tion to the platen at a different point, clamps for gripping the side margins of the carbons independently of the Work-web for holding the carbons 'stationary in carbon-shifting position, a rock-shaft on Which the clamps are mounted, a spring normally1 urging the rock-shaft in a direction to make the clamps effective, a cam-follower for holding the clamps ineffective, and la cam controlling the follower and arranged to be operated by the backward movementk of the platen-sweep handle that returns the Work- Web and carbons to carbon-shifting position, the cam having a sudden drop arranged to be brought opposite the follower by said feeding to permit the spring to snap the clamps to etleetive positions.

In a continuous billing typewriting' machine, the combination with a vrevoluble platen, of la high paper-table at the rear of the platen to support the Work-Web and carbonsl in acarbon-shifting position, a knife-supporting frame at the front of the platen, a Work-severing knife on the frame., and webbing connecting 'the high rear paper-table and the yknife-supporting frame to cooperate With them to form a rigid truss, so that each supports and .reinforces the other. i

24. In a continuous billing typewriting machine, the ,combination with a revoluble platen, of a knife-supporting frame at the front of the platen, a knife supported upon the frame for" severing the work-Web, and an upwardly-extending Web-supporting iinger carried by the frame behind the Work- Web to hold the Web conveniently near the knife to be grasped by the operator for severing and to prevent 'the Webs passing ff a second time around the platen.'

CLARENCE M. oREWs.

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