US1109671A - Type-writing machine. - Google Patents

Description

Patented Sept. 8, 1914.

2 SHEETS-SHEET 1.

Qu N H. V. PENGLER. TYPE WRITING MACHINE. APPLIUATIOE FILED JUE 24, 191%.

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R O T N E V lNl Patente Sept. 8, 1914.

2 SHEETS-SHEET UNrrED STATES PATENSI." oEEioE.

HERMANN V. FENGLER, OF WEST PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 UNDEBWOOD lTYIE1El7R'[TEB COMPANY, OF NEW YORK, N. Y., A CORPORATION 0I DELAWARE.

Application filed .Tune 24, 1814. Serial No. 846;.933.

To all whom it may concern:

Be it known that I, HERMANN V. FEN- GLER, a citizen of the United States, residing in Test Philadelphia, in the county of Philadelphia and State of Pennsylvania, haveinvented certain newv and useful Improvements in Type-lVriting Machines, of which the following is a specification.

This invention relates to typewriting machines and more particularly to means for rotating't-he platen firstin one direction to bring 4a Aworksheet thereon into position to be removed, and then in the reverse direction to bring a new work-sheet into position to be written upon.

In Amaking tvvpe'written .entries upon a series of bills or other work forms, vit is customary to make a record copy on a record sheet which remains on the machine toreceive the duplicate entries of a number of bills. when the typewritten entries on a bill have been completed, the platen is rotated backwardly into position to permit the bill to be.removed, and to4 receive the succeeding bill which is then placed on the machine and the platen rotated forwardly to bring the new bill into position to be lwritten upon'. :As the rec-0rd sheetmoves with the platen during both its backward and forward rotations, the forward rotation must be through a somewhat greater angle than the backward rotation, to provide suitable spacebetween the entries on the recordsheet.l l

' In accordance with the present invention,

i a driver is provided for rotating the platen iii-both directions, by a movement of the driver in onev direction, Said driver operable stroke or movement in the saine direction to rotatey'the platenforwardly through a some- -what greater angle for bringing anew' work-piece ,into position to be written upon,

Aand positioning the record-sheet to receive the record copy of the new entry. The:

driver; may be returned toinitial position without rotating the platen.

In practicing the invention,- the driverV may'comprise' a rod slid-ably mounted. on 'the -paper carriagetoreciprocate thereon, said Specification of Letters Patent.

TYPE-WRITING MACHINE.

Patented sept. s, 1914.

rod carrying a pair of parallel raclecarrying bars 1n which are adjustablpv mounted -racks, arranged to drive a pinionvconnected to the platen for rotating the latter, said racks engaging opposite sides of the pinion 'movement of the plunger to rotate the platen backwardbvv to bring a work-piece thereon into position for removal from the machine.

`and after the first .rack passes bevond the pinion,the other rack engages the opposite side of the pinion and rotates the platen forwardly to position a new work-piece thereon. The parallel rack-supporting bars or carriers are connected by links, and during thevadvance of the driver, said bars are engaged b v cams which throw the said bars toward each other into position to engage the rackswith the pinion, and rotate the platen. but during the return of the driver, said cams are swung out of holding position and permit the parallel bars tothe separated by springs and hold the racks away from the pinion, so that the driver. is returned without rotating the platen. Each'rack is adjustable in its supporting bar to vary the amplitude of rota'- tion of the platen thereby, and graduated scales may be provided to show the position of the racks, and indicate the extent the platen will be rotated by the driver. The scales are preferably graduated to indicate the number of line-spaces through which the platen will be rotated. An adjustable gage limits the operating' stroke of the driver, and

coperates with the rac-'k to positively prevent backward rotation of the platen beyond the point forv which the gage is' set. The driver maybe held in its intermia-te position after the first rack'has rotated the platen backwardly, and before the second rack has come into operation by meansof'a springactuated cam engaging with" aV detent adjustable with the first rack. l

-Other features and advantages will hereinafter appear.

AThis application shows certain features ot invention also disclosed in my co-pe'nding application No. 846,934, led'J une 24, 1914.

Inthe accompanying drawings, Figure 1 is a sectionalelevation view of an Under-A woodgtypewritingiachine withthe present inventionapplied thereto. Fig. 2 is a fragmentary sectional view as indicated by the section line 2-2 on Fig. 1. Figs. 3, 4 and 5 are fragmentary views similar to Fig. 1, but showing the driver in different positions. Fig. 3 shows the driver in an. intermediate position assumed during the forward or driving stroke,I the first rack having rotated the platen backwardly, and the second rack just commencing to advance theplaten. Fig. 4 shows the driver having completed its driving stroke. Fig. 5 shows the driver at an intermediate position during its return movement, the racks being held awa from the pinion. Fig. 6 is a sectional detail view showing the, upper rack 'and its carrier, and the adjustable stop thereon. Fig. 7 is a front view of the same. Fig. 8 is a fragmentary perspective view showing the lower the detentrack and carrier andthe rack-holding clip. F ig. 9 is a erspective view of said clip and olding cam thereon. Fig. 10 is a sectional view of a modification in which the lower rack is placed up-side-down in its support, so as to be inoperative, and permit the upper rack alone to drive the platen. Fig. 11 is` a detail plan view showing the scale on the upper rack bar.

The platen ,-1 is mounted on an axle 2 l journaled in the ends 3 of the platen frame, 80

which frame falso comprises anV inclined paper -shelf 4 connecting the ends 3, and located at the intake'side of the platen. The

platen frame is supported on and forms part ofthe paper carriage 5 mounted to travel on guide-rails 6 on the machine frame 7.

. Ty e-bars 8, operated in the usual way,

stri e against the front face of the platen. Front and rear feed rolls 9 and 10 are supported o n levers 11 pivoted on a rod 12 and are spring-held against the undersurface of the platen. -Said feed rolls may. be lifted from the platen by cams on a key-operated rock shaft 13, said cams engaging arms 14 of the levers 11 to spread said arms and lift the feed rolls from the platen.

The construction and operation of the above-named parts may be the same as is common in the commercial Underwood typewriting machine.

The mechanism forA rotating the platen backwardly and forwardly in billing or other work in which bills or the like are placed on the machine serz'atz'm, will now be .'described. Such mechanism comprises a re- `ciprocating driver 15 which as shown, comprises arod slidably mounted 1n bearings 16 and 17 on the paper carriage. The rod 15 carries a pair of parallel guide bars or carriers 18 and 19, in which are slidably. mounted upper and lower rack bars 20 and 21. Links 22 are connected at their upper "ends by pivots 23 to the rod 15, the lower ends of said links being pivoted to the lower rackcarrier' 19, and lin s 24 are connected to the upper rack carrier 18 and to the links thereon to engage with any one of 22 at a point between said carriers. The links 22 therefore form a' swinging-support for the carriers 18 and 19, while the links 22 and'24 form a toggle connection between said carriers, permitting the latter to be moved towardmi other. The racks 20 and 21 are provided with rack teeth to drive a pinion 25 firedA to theplaten axle 2, or otherwise connectedA to drive the platen.

The rack bars 20 and 21 are slidably mounted for longitudinal adjustment in channels formed in thecarriers 18 and 19, and,yas shown for example in Fig. 8, the rack bars may be formed with ribs 26, which slide in grooves 27 formed .in the side walls of said channels. The rack 21 is held in its adjusted position by means of a U-shapcd spring clip or holder 28, having a -lug 29 a series of notches 30 in the rack-supporting bar 19, said holder being secured, as by means of a pin 31 to the forward end of the rack 21. By grasping the holder 28 between the thumb and finger, the holding lug 29 may ybe sprung inwardly to release the rack and latch or holdingl clip 33 similar to the holder 28 for maintaining the rack 20 in'any posivtiOn of adjustment.

In Fig. 1, the driver is shown in its initial or normally operative position. A ledger sheet or other recordsheet 34, is shown occupying a position on -the platen reached after the record entries from a number of bills have been made thereon, and a bill or other work-piece 35 and carbon sheet 36 are shown in the position they assume when placed on the paper shelf ,4 with their leading edges at the bite of the rear vpressure roll 10 and the platen, preparatory to being fed forwardly into position to be written upon.

The driver is held in its normal position of rest by a coil spring 37 mounted thereon between the b earing 1G and a handle 38 on the upper end of the-driver, the upper link 22 being held against the lug 16. When the operator presses the handle 38, the driver is advanced, and the leading edges of the bars 18 and 19 engagethe projecting ends of camsV 39, which, by retarding said bars, cause the latter to be' swung `rearwardly relative to the rod 15, so that the links 22 and 24 assume the inclined position shown in Fig. 4. In other words, the advance of the rod 15, while the parallel bars are held against forward movement, causes thel links 22 and 24 to assumean inclined position,

thereby drawing the parallel bars toward each other,'so that the rack teeth can engage the'pinion 25. The rack carriers, after being thrown into operative position, ride 6 5-s`cale 48 (Fig. 11) along which the gage 45.

3) ong the cams 39 and are held in operative position by said-cams during the entire advance or driving stroke of the driver. As'

rack carriers are thrown into operative position, the iirst or leading rack 21 atonce engages the pinion 25 and as the driverI advances, rotates the platen backwardly until downwardly through a slot 43 in ,the baur 19. The driver is held by the detent while the bill or other work-sheet, which has. been carried back onto the shelf 4; by

the backward rotation of the platen, is removed and. a new sheet substituted. The detent Li has suiiicient holding power to prevent movement of the driver by the spring 3'? and also prevents accidental rotatronof the platen at this time. The operator now pushes the driver forwardly from its intermediate position, the detent i0 on the spring arm 44g being thereby forced out of the notch 4:1` (see Fig. 3) and the upper rack engages the driving pinion 25,'and rotates the platen orwardly until a stop 'i5 the guide 18` strikes the driving pin; ion and-lookstlle platen against further forward rotation. The stop 45 is adjustable the bar 18 andshel'd in adjusted positionbyaset-serew 4.6 shown in Fig. 6. lfhefstop 475 is adjusted to such a position that the forward rotation oi the platen by the driver will bring the work-sheet into position to receive lthe iirst line of writing. The lower rack 2 1 is adjusted to eiect a backward rotation of the laten through a somewhat smaller angle tlian the forward rotation thereot by the driver. This is in 'order that the record sheet 34, which moves backwardly and forwardly with the platen, may be carried forwardly a sufficient distance is? .n uowbill is placed on the platen to provide a space on tie record sheet between 'the new record and heV preceding record. lo, practice, this space. is usually equal to two line-spaces, but may be varied desired. A L :tod scale. 47 on the gnide bar 19 facilitates the adjustment of the raclr 2i to any desired position, the scale gradnations protoni-bl corresponding to the hnefspaco rota-tions 027 the platen. Also the s acing of the rack teeth teeth on the riving pinion is; preferably equal to the spacing of the scale markings. In other Words, cach rack tooth advances the platen through. a linefspace distance, that 1 s, the distance through which the platen is rotated. at each operation of the usual. lmespace mechanism (not shown). The rack mm2() may be provided with-a graduated is adjustable, the scale indicating the number of line-spaces throu h which the platen Will be rotated forwardly in. bringing the gage liup to the pinion 25. The scale 4.8- may be on the upper face of the rack bar 20, and the bar 18 may be formed with an open slot or channel 20a in which the rack bar is guided. After the driver has completed its driving stroke, a slight movement thereof in the reverse direction, which may be eii'ected either by the spring 37, when the handle is released by the operator, or by a pull on the handle, the cams 39 are rotate(1 about their pivots 49 to the Fig. 5 position, and permit springs 50 to spread the guide bars 18 and 19 and free the racks from the driving pinion, so that the driver may rcturn to its initial position Without rotating theplaten. The cams 39 are lightly held by springs 51 in the Fig. 1 position against stop pins 52 and the pressure of said bars against the cams is in a direction to hold the cams against the stop pins 52. A very slight forward movement however, of the driver swings said cams suihciently to permit the guide bars, underthe influence of the springs 50, to snap the cams to the Fig. 5. position, so that the pinion 25 is released Without any material rotation as the driver commences its return movement. The springs 50, as shown in Fig. 6, may be mounted on guide pins 53 on lugs 5l projecti-ng laterally from the guide bars.

If desired, the lower rack bar 2l may be removed, and the upper rack bar 20 alone used. The driver may thus be used in placing envelops, bills, or other work-pieces on the platen serz'atm.

In Fig. 10 a slightlyV modilicd form. of lower rack bar 21a is shown in an inverted position in the guide 19, in which position it is out ,of the Way, permitting the upper rack to be used alone, but th" rack bar 21a may be reversed, and used in connection With the upper rack bar when it is desired to drive the platen in both directions. .In this form the rack bar 21a is provided with a rib 26 along each side' and the guide bar 19 is provided with correspondingly positioned grooves 27.

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 combination withja platen, of a vdriver for rotating the platen first in one direction, and then. in the other direction during the movement of the driver in one direction, said driver returnable to initial position without rotating the platen during -its return movement.

2. The combination with a. platen, of a .driver for rotating the platen, said driver n comprising racks, and gearing between said pinion connected to rotate the platen, a

reciprocating driver to rotate said pinion, said driver comprising vparallel supporting bars, links connecting said bars, racks adjustably mounted in said bars, one of said racks located in advance of the other to engage said pinion and rotate the platen in one direction during part of the advance movement of the driver, the other rack being in 'position to engage said pinion and rotate the platen in the opposite direction during a further advance vmovement of the driver, cams in position for holding said supporting bars in operative position during the advance of the driver, said cams mounted to swing'out of said holding position during the return of the driver, springs to hold said supporting bars out of operative position during the return of the driver, a detent to hold the driver in an intermediate position after the first rack has operated but before the second rack has operated, an adjustable stop to limit the advance movement of the driver, and a spring to hold the driver in its normal position.

4. In a typewriting machine, the combination with a roller platen, of a gear pinion connectedto rotatethe platen, a reciprocating driver to'rotate said pinion, said driver comprising parallel supporting bars, links connectin said bars, and racks adjustably mounted 1n said bars,one of said racks 1ocated in advance of the other to engage said pinion and rotate the'platen in 011e direction during part of the advance movement of the driver, the other rack being in position to engage said pinion and rotate the platen in the opposite dire'ction'during a further advance movement of the driver.

5. In a typenv'riting'machine, the combination with a roller platen, of'a gear pinion connected to rotate the platen, a reciprocating driver to rotate said pinion, said driver ,comprising parallel supporting bars, links connecting said bars, racks adjustably `mounted in said bars, one of said racks located in advance of the other to engage said pinion and rotate the platen in one vdirection during part of the advance movement ofl the driver, the other rack being in position to engage .said pinion and rotate the platen in the opposite direction during a further advance movement of the driver, cams in posi'- tion for holding said supporting bars in operative position during the advance of the driver, said cams mounted to swing outfof said holding position during the return of ing driver torotate said pinion, said driver comprising parallel supporting bars1 links connectino` said bars, racks adjustably mounted 1n said bars, one of said racks located in advanceof the other to engage said pinion and rotate the platen in one direction dring part of the advance movement of the driver, the other rack heilig' in position to engage said pinion and rotate the platen in the opposite direction during a further advance movement ofthe driver, cams in position for holding said supporting bars in operative position during the advance of the driver, said cams mounted to swing out of said holding position during the return of the driver, springs to hold said supporting y bars out of operative-position during the return of the /driver, a detent l to hold the driver in an intermediate position after the irst rack has operated but before the second rack has operated, and a detent holder connected to said iirst rack and adjustable therewith whereby the driver is held by the detent in a position correspondin to the positin of adjustment thereon of tle said first rac v 7. In a typewritin machine, the combination with aroller paten, of a gear pinion connected to rotate with the platen, a driver comprising a rod mounted for reciprocating movement, said driver comprising parallel rack supporting bars, links connecting said bars to each other and to said 'supportroch racks mounted for adjust-ment longitudinally in said bars, one of said racks located in advance of the other to engage said pinion on one side and `rotate' the platen in one direction during part of the advance movement of thedriver, the other rack being in position to engage said pinion on the opposite side and rotate the platen in the opposite direction during the further advance movement of the driver, cams for holding said supporting bars in operative position during the advance of the driver, said cams mounted to move out of holding position during the return of the driver, means to hold said supporting bars out of operative position during the return of the driver.l and mea ns to hold the driver in intermediate' position after the first rack has operated but before. the second rack has 'o}.erated.

t3.I In a typewriting machine, the combination with a roller platen, of a gear pinion connected to rot-ate with the platen, a driver comprising a rod mounted for reciprocating movement, said driver comprising parallel rack supporting bars, links connecting said hars to each other and to said support rod,

and racks mounted for adjustmentiongitudinally in said bars, one of Said racks locatedin advance of the other to engage' the opposite direction during the furtherl advance movement of the driver.

9. In a typewriting machine, the combination with a roller platen, of a gear pinion connected to rotate with the platen, a driver comprising a rod mounted for reciprocating movement, said driver comprising parallel rack supporting bars, links connecting said bars to each other and to said support rod, racks mounted for adjustment longitudinally in said bars, one of said racks located in advance of the other to engage said pinionp on one side and rotate the platen in one direction during part of the advance movement of the driver, the other rack be.- ing in position to engage said pinion on the opposite side and rotate the platen in the opposite direction during the further advance movement of the driver, cams for holding said supporting bars in operative position during the advance of the driver, said cams mounted to move out of holding position during the return of the driver, means, to hold said supporting bars out of of operative position during the return of the driver, means to hold the driver in inter'- inediate position after the rst rack has operated but before the second rack has operated, and scales on said supporting bars to indicate the position of the raclis thereon.

10. In a typewriting machine, the combination with a roller platen, of a gear pinion connected to rotate with the platen, a driver mounted for forward and backward movement, said driver comprising racks to rotate A said pinion, one of said racks located in advance of the other tov engagesaid pinion and rotate the platen in one direction during part of the forward throw of the driver,

the other rack being in position to engage said pinion and rotate the platen in the opposite direction during a further forward movement of the dri'-,y er, and means for holding said racks in operative position duri-ng the advance of the driver and in inoperative position during the return of the driver.

11. The combination with a paper carriage and platen, of a driver having a limited backward and forward movement, said driver comprising means operable during a portion of its movement in one direction to rotate the platen backwardly and during a further portion of its movement in said direction to rotate the platen forwardly.

12. The combination with a paper carriage and platen of a driver having a limited backward and Y forward movement, said driver comprising means operable during a portion of its movement iu one direction to rotate the platen backwaidly, and during a further portion of its movement in said direction to rotate the platen forwardly, and mechanism to move said platen-rotating means to inoperative position and permit the return of the driver without rotating the platen.

13. The combination with a paper carriage and platen, of a gear connected to drive the platen, a driver mounted to have an advance and return movement on the carriage, said driver comprising teeth to engage said gear and rotate the platen in one direction'duiing a portion of the advance move-- ment of the driver, and other gear teeth to engage said gear and rotate the platen in the opposite direction during a further portion of the advanceV movement of the driver, said gear teeth movable to inope ative position during the return of the driver.

14. The combination with a platen, of a reciprocating driver, and gearing between the platen and driver, said driver comprising racks operable one after the other, to drive the platen first in one direction and then in the opposite direction during a movement of the driver in one direction.

15. The combination with a platen, of a reciprocating driver, gearing between the platen and driver, said driver comprising racks operable one after the other, to drive the platen first in one direction and then in the opposite direction during a movement of the driver in one direction. and means to automatically move said raclts to inoperative position aft er they have driven the platen and thereby prevent rotation of the platen during the return movement. of the driver. 16. In a typewriting machine, the combination with a platen, of a platen-rotating device comprising means operable during a movement of'said device in one direction to rotate the platen first in one direction through a predetermined angle, and then in thie reverse direction through a different angle, and means to limit the movement of said device in both directions. 17. In a typewriting machine, the com bination with a platen, of a platen-rotatmg device comprising means operable during a movement of said device in one direction. to rotate the platen first in one direction through a predetermined angle, and then m the reverse direction through a different angle, said platen-rotating means being adjustable to vary the eXtent of rotation of the platen in both directions. 18. In a typewriting machine, the com bination with a platen, of a platen-rotating device operable during movement in one direction to rotate the platen backwardly and during another portion of its movement in said direction to roa portion of its` tate the platen forwardly through a greater angle than it was rotated during said back- Y ward rotation, said platen-driving means being returnable to initial position without rotating the platen.

19. In a typewriting machine, the combination with a roller platen, of a reciprocating platen driverv comprising a rack to rotate the platen in one direction as the driver advarices, and a second rack to rotate the platen in the reverse direction during a further advance of the driver, and a detent to yieldingly hold the driver in an intermediate position after one rackl has operated, and before the other'rack is brought into operation.

.20. The combination with a. platen, of a pmion connected to rotate the platen, a reciprocating driver comprising racks to run on opposite sides of thepinlon and rotate the platen in opposite directions, means to automatically hold the racks in operative position during the movement of the driver in one direction, and means to automatically move said racks to inoperative position during the movement of the driver in the reversedirection.

2l. The combination with a roller platen, of a pinion connected to rotate the platen, a driver comprising a supporting member and parallel rack-supporting bars extending on opposite sides of said pinion, said bars having a swinging connection with the said supportng member, a toggle link connection between the bars, vracks mounted in said bars, cams to swing said bars relatively to the supporting member and hold the racks in o erative relation to said pinion during the orward movement of the driver, said cams mounted to swing to inoperative position during the return of the driver, and springs to throw the racks to inoperative posltion during the return of the driver.

22. In a typewriting machine, the combination with a platen, of a gear connected to rotate the platen, a driver comprising parallel rack support-ing bars extending on opposite sides of the driver and racks adjnstably mounted in said bars, cams to engage said bars and move them toward each other and hold the racks in operative relation to the dri-ving gear during the movement of the driver in one direction, and means to automatically move the racks to inoperative position and retain them in such position during the return of the driver.

23. In a typewriting machine, the combination withra. paper carriage and a roller platen mounted thereon, of-a gear connected to rotate the platen, a reciprocating pinten driver mounted on the carriage and comprising a rod extending forwardly therefrom and provided with a handle at its forward end, and parallelv racks connected to said rod, one in advance of the other and arranged to run on opposite sides of said gear to rotate the platen first in one direction and then in the opposite' direction as the driver is advanced.

24. In a typewriting machine, the combination with a paper carriage and a roller platen mounted thereon, of a gear connected to rotate the platen, a reciprocating platen driver mounted .on the carriage and comprising a rod extending forwardly therefrom and provided with a handle at its for- -ward end, parallel racks connected to said rod, one in advance of the other and arranged to run on opposite sides of said gear to rotate the platen first in one direction and then in the opposite direction as the driver is advanced, means to hold said racks in opera-tive position during the advance of the driver, and means to automatically hold said racks in inoperative position during the return of the driver.

25'. In a typewriting machine, the combination with a paper carriage and a roller platen mounted thereon, of a gear connected to rotate the platen, a reciprocating platen driver mounted on the carriage and 'comprising a rod extending forwardly therefrom and provided with a handle at itsl forward/end, parallel racks connected to said rod, one in advance of the other and arranged t-o run on opposite sides of said gear to rotate the platen iirst in one direction and then in the opposite direction as the driver v advanced, means to hold said racks in operative position during the advance of.v the driver, means to automatically hold said, racks in inoperative position during the return of the driver, a spring to hold the driver in its initial position, said spring being tensioned during the advance otl the driver, and a detent to yieldingly hold the driver stationary against the tension of said spring with the driver in an intermediate position in which one of the racks has operated. to rotate the platen.

2G. The combination with a platen, of a' platen driver comprising parallel rack-supporting bars, racks independently supported and adjustable on said supporting bars, and graduated scales on said bars to indicate the positions of the racks on said bars.

27. The combination with a platen, of a platen driver com rising racks, and a pinion to be engaged y said racks and rotated in one direction by one rack, and in the op posite direction by the other rack, said pinion connected to rotateA the platen, said driver comprising rack-supporting bars in which said racks are mounted, one of said racks being reversible in its supporting bar for support in inoperative position, whereby the driver may be operated to rotate the platen in one direction only.

28. The combination with a rack bar, of a channel bar in which the rack bar isisupported, and a spring holding clip connected to said rack bar, said clip comprising a lug engageable in notches formed in the channel bar, and thereby holding the racl bar in dierent positions of adjustment.

Q9. The combination With a rack bar having a rib extending along one side thereof, of a lchannel supporting barv in Which the rack bar is slidably mounted, Isaid supporting bar formed with a groove to receive said rib, and said supporting bar formed with a series of notches perpendicular to the rack bar, and a spring clip secured to the end of the rack bar and comprising a lug to engage in any one of said notches and hold the rack adjusted.

30. The combination with a platen, of a gear connected to rotate the platen, a platen driver comprising a reciprocating rack supporting 'and guiding bar, a rack slidably mounted in said bar and operable to engage 'said pinion and rotate the platen, said rack adjustable along the holding bar, a holding device connected to the end of the rack and comprising means for holding the rack in dierent positions of adjustment along the bar, said holding device also comprising a holding cam, and a spring detent to engage saidy cam andhold the driver in a position determined by the adjustment of' the rack.

31. In a typewriting machine, the combination with a platen, of a pinion connected to rotate thev platen, a' platen driver comprising parallel rack-supporting bars arranged to run on opposite sides of the pinion, said bars formed with channels facing the pinion, racks sldably mounted in said channels and provided with rack teeth to mesh with the pinion, spring holding clips connected to said racks and comprising spring lingers extending upwardl from said channels in position 'to stra` dla said pinion, and a holding lug connected to each of said clips to engage 1n holdin notches formed in the channel bars, an thereby hold the racks in adjusted position.

32. In a typewriting machine, the combination with a platen, of a pinion connected to rotate the platen, a 'platen driver comprising parallel rack-supporting bars arranged to run on opposite sides-of the pinion, said bars formed with channels facin the pinion, racks slidably mounted in sai channels and provided with rack teeth to mesh With the pinion, spring holding clips connected 'to said racks and comprising v spring fingers extending upwardly from said channels in position to straddle said pinion, a holding lug connected to each of said clips to engage in holding notches formed in the channel bars, and thereby hold theracks in adjusted position, one of said racks being held in advance of the other to cause the platen to be rotated first in one direction and-then in the other during the advance of the driver, and one'of said holding clips having a cam extension projecting through a slot in the holding bar,

and a spring detent to engage said projection when the pinion has been rotated by the first rack.

' HERMANN V. FENGLER.

Witnesses:

J. B. BLODGETT, WILLIAM A. HARTNETL.

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