US 1988189 A
Description (OCR text may contain errors)
Jan. 15, 1935. w. A. DOBSON 1,988,189
TYPEWRITING- MACHINE Filed Sept. 23, 1951 3 Sheets-Sheet Jan. 15, 1935. w. A. DOBSON TYPEWRITING MACHINE- Filed Sept. 23, 1931 5 Sheets-Sheet 2 linen/or:
Jan. 15, 1935. w DQB$QN TYPEWRiTING MACHINE Filed Sept. 23, 1931 3 Sheets-Sheet 3 Patented Jan. 15, 1935 UNITED STATES PATENT OFFICE- 1,9ss,1s9 TYVPEWRITING mom William A. Dobson, Bridgeport, Conn., minor to Underwood Elliott Fisher Company, New York, N. Y., a corporation of Delaware Application September 23, 1931, Serial No. 564,482
The upper edge of the sheet slightly bulges be-' tween the side paper-fingers, and fouls the usual swingable bail adjacent the platen.
,Moreover, when typing at the top of the sheet, the upper edge thereof does not reach the usual bail,'and the operator has to keep it in released position,'durin g the first line-spacing operations, until said upper edge feeds to a position between said released top-rolls and the platen. If the operator drops the bail before starting to write, as often happens, the top of the sheet fouls upon the bail. 1 v A feature of the invention is to overcome these drawbacks by enlarging the opening between the.
the paper-sheet around the front of the platen to be fed between said top-rolls and the platen, and without necessitating any manipulation or releasing of these top-rolls.
Another feature of the invention is to provide for simultaneous easy release of the bottom and top rolls and paper-fingers by a single operation. To guide the paper into the throat formed by the platen and top-rolls, a middle or intermediate top-roll is provided'to co-operate with a stationary or non-traveling center finger, while the two side top-rolls co-operate with side fingers. The latter slide on a tiltable support. This center finger deflects the middle of the top of the sheet, so that the upper edge meets the top-rolls in a manner to insure automatic insertion of said edge under the top-rolls. Another feature of the invention is that the bottom feed-rolls, the paper-table, a scale carrying said paper-fingers, and the top feed-rolls are mounted separately around theplaten in order to be more easily adjusted, and that the means supporting the lower end of this papertable-and this scale respectively are each provided with a bendablepar't allowing a ready adjustment of the position of these organs with respect to the) periphery of the platen.
Other features and advantages will hereinafter app ar. f
In the accompanying drawings,
Figure 1 is a cross-sectional view of the platencarriage of an Underwood portable typewriting machine having the present invention applied thereto, the section being made along a line indicated by A-A in Figure 3. This view shows all the paper feeding and guiding means in their operative position.
- Figure 2 is a perspective view of the platen-carriage and a portion of the frame-front rail of the structure shown in Figure 1.
Figure 3 is a top-view of the platen-carriage with parts broken away to illustrate the bottom feed-rolls and their release-mechanism.
Figure 4 is a simplified viewsimilar to Figure 1, showing all the feed-rolls and the paper-fingers in released position.
Figure 5 is a simplified view similar to Figure 1, showinghow the central part of the work- .sheet is guided for automatic insertion'under the central top-rolls by a stationary finger and how the centralpart of thepaper-table-a'pron rests on the inner side of the front carriage-base.
Figure 6 is a simplified view similar to Figure 1, showing that the bottom feed-rolls are restored independently of the top-rolls.
Figure 7 is a perspective view similar to Fisure' 2 with parts broken away to better illustrate other parts.
- Figures 8 and 9 aredisassembled perspective views of certain of the parts of the improved top-roll mechanism.
Figure 10 is a simplifiedsectional view similar to Figure 1, showing the folded position of the rear part of the paper-table.
The work-sheet or pack 10 is inserted from the rear of the machine over a two-section papertable 11, 12, .down between a revoluble platen 13 ically guided under said top-rolls 16, on its sides by means of two front-paper fingers 18 and cenmechanism 103. This work-sheetlo is automat- I trally by means of a stationary center finger or guide 19. r
In order to create av feeding mouth or flare a large as possible between the top-rolls 16 and the platen 13, the diameter of these top-rolls 16 is made as large as permitted by the internal dimensions of the carrying'case 20 (Figure 1). In
practice it was found that these front rolls would have to be subs antially larger in diameter than the top feed-rolls heretofore used, in order to create a mouth of sufliciently large flare to insure an automatic insertion of the work-sheet 10 under the top-rolls 16. In the class of portable machine herein shown a diameter of .460" was found to be large enough for the top feed-roll to insure automatic insertion.
In order to accomplish automatically this insertion of the sheet under the top-rolls, it is desirable that at least three top-rolls 16 be used, that is, one near each side of the sheet co-operating with the lateral paper-fingers 18 and one substantially in the center of the sheet co-operating with the center finger or guide 19.
In this manner said paper-fingers 18 and said guide 19 deflect the top of the sheet 10 just before its entrance under their respective top-rolls 16, so that the upper edge 21 of said sheet meets said rolls 16 at an angle which is sufficiently acute by reason of the oversize diameter of said rolls to insure, see Figure 5, that the sheet will be automatically fed under the top-rolls 16, without any manipulation-or releasing of said top-rolls or of the paper-fingers being required.
The stationary center guide-finger 19 is slightly separated from the platen to provide'a clearance for the side paper-fingers 18 on the carriage to pass thereunder when typing on the extreme outer ends of the work-sheet. Due to the space thus left between the center finger 19 and the platen 13 the top portions of the sheets 10, when being inserted into themachine, are liable to bulge away from the platen and toward the cross.- rod forming part of a feedqoll bail 26.
In order to insure that the sheets 10 are de-- flected under the cross-rod 26, the center roll 16 is provided to co-operate with. the center guide-finger 19, so that the leading portions of the sheets immediately upon leaving the guidefinger'contact with the lower portion of the upper I roll, which is being revolved by the turning of the platen during the upward feeding of the sheets. This revolving roll 16 therefore acts to deflect the sheets to the rear and 'down against the platen, and under the cross-rod 26, thereby enabling the sheets to be inserted withoutany danger of interfering at their midle portions with the crossrod.
When the work-sheet 10 has to be aligned, all the rolls 14, 15, 16, and the two lateral paperfingers 18 are simultaneously removed away from the platen, so as to give to the sheet the necessary freedom of motion. This is done by swinging forward about the platen-axis a release-lever 22 mechanically connected through a slot-and-pin connection 23, 24 and a link 25 to the bail 26 carrying the top-rolls 16, and through a link 27, a crank 28 and a cam-shaft '29 to pivoting levers 30 carrying the bottom feed-rolls'14, 15. Each of the two levers 30, carrying the front bottom rolls 15, presents a nose 31 for engaging an inward extension 32 of a tiltable support 32, carrying the paper-fingers 18, and which support, in order to present the paper-fingers against the platen, is urged inwardly by a pair of springs 33, anchored on the cam-shaft 29. Thus, at the same time as theupper and lower rolls 14, 15, 16 are simultaneously released, these noses 3lswing said support 32 against the action of these springs 33, so as 'to remove the paper-fingers 18 away from the platen. The extension 32 may be easily bent to adjust said paper-fingers 18 in position with respect to the platen.
In the normal operative position of the feeding and aligning device of the invention (Figure 1) the top-rolls 16 are held against the work-sheet 10 with a yielding pressure by means of two W- shaped coiled springs. Each of said springs (Figure 5) has a tail 34, working in agroove 35, provided in a lug or bail portion 36 of the bail 26; a spiral body 37, wound around a collar-nut 38, fixed by screw 39. to the end-plate 40 of the platen-carriage 41; and a fixed end 42 reacting against the inner side of the front rail 43 of the platen-carriage base-plate 41. This arrangement permits ready removal of the bail without entailing dismantling of the springs.
The bottom feed-rolls 14, 15 are likewise yield ingly held pressed against the work-sheet 10 by four W-shaped springs 44, hooked at one end at 45 under each lever 30 and reacting against the base-plate of the platen-carriage 41 at their other end 46, while the springs 33 tend to pull the tiltable support 32 towards the platen, and there-.
by cause the paper-fingers 18 to press said work sheet 10 against the platen 13.
In this normal operative position, the pin 24 carried at the rear end of the link 25 is almost at the rear end of the circular slots 23, 'a slight space 47 (Figure 1) being provided for the freev cam-shaft 29, said flats being then in a substan- I tially horizontal position. These flats are on one side of the cam-shaft only andeach fiat may serve a pair of opposite levers 30.
When the release-lever 22 is brought forward in the position of Figure 4, the two flats 50 are turned to a substantially vertical position, and
the four levers 30 are swung against the action of said springs about studs 51, inwardly projecting from two end-brackets 52, secured by screws 53 to the base-plate 41 of the platen-carriage 41, thereby releasing the bottom feedrolls 14, 15.
These end-brackets 52 are also used as bearings for thecam-shaft 29, which has, near the crank 28, a third bearing 54 secured to the platencarriage by screws 55.
Swinging of the lever 22 backwards restores the flats 50 totheir horizontal position, thereby releasing the levers 30 to the action of the springs 44, 45, 46 and the rockable support 32 to the action' of the springs 33. Hence these springs close simultaneously the bottom feed-rolls 14, 15 and the paper-fingers 18, while the top-rolls 16 remain in their released position, as, during this backward movement of the lever 22, the pin 24 merely slides along the "circular slot 23 (Figure 6). Due to the slot-and-pin connection 23,
24, when the release-lever 22 is in its normal position (Figure 1) said top-rolls 16 may be opened by a light firm pull on the rod of the bail 26 opened (Figure 4) and closed "(Figure 6) independently of the top-rolls 16.
The release-lever 22 is mounted at one end of the platen 13'ona boss 56,inwardly projecting I from the end-plate 40 of the platen-carriage 41" and serving also as bearing for the platen-shaft 5'1. Its slot 23 projects forwardly beyond the end of the travel of the pin 24, and, for assembly convenience,'ends in an enlarged opening 58 allowing a ready insertion of the head of the collar-screw forming the pin 24. I
The two end-arms of the bail 26 are offset at 59, so as to fit below the cover 60 of the end-. plates 40 close against the inner wall of said latter. One of these arms is permanently secured to the rod of the bail 26 by riveting or soldering, while'the other arm has a rectangular opening 61 and is removably fixed on a rectangular end 62 of said bar by means of an end-screw- 63 (Figure 9), in order to allow a ready placement or removal of the top-rolls 16 on or from the rod of the bail. Though these rolls 16 may be easily adjusted in position along said rod, so as prises four rolls 14 mounted at intervals on a shaft 65, said shaft being shouldered at its ends for. retention in sockets 66 provided at the outer ends of the two rear levers 30, while the row of front pressure or feed rolls comprises likewise four rolls 15 mounted at intervals on a shaft .67, similarly held in the sockets 66 of the two-front levers 30.
The paper-fingers 18 are slidably mounted,
by means of hooks 68, on a rod or rail 69, located in front of the platen 13 below the printing line. This rod 69 is fixed near its ends by bolts 70 to the tiltable supports 32 and is spaced by washers or shims '71 from; a conventional front scale 72, secured thereto at both ends by means of screws 73. The clearance thus'p'rovided between the rail or rod 69 and the front scale 72 thus allows the paper-fingers 18 to be moved laterally along the rail for marginal engagement with sheets 10 of different widths. To stabilize this sliding movement the paper-fingers are furthermore guided along the upper edge of the front scale by means of stamped-out tongues 74, bent over said edge,
By bending the projections 32' of thesupport 32', the operative position of said scale '72 and of the paper-fingers 18 may be readily adjusted relatively to the platen.
Each support 32, projecting downwardly from the rod 69, is provided with an opening 75 and a stamped-out tongue '76, projecting insaid opening and serving as a hook for'one of the springs 33. It is also provided at its lower'end with a pair of tenons '17. These four tenons are loosely engaged into mortises 78, provided in the baseplate 41, play being provided to allow the necessary tilting movement of said tenons in said mortises when the paper-fingers 18 are released by the feed-roll-carrying levers 30.
The stationary center finger orguide 19 is formed as an upward projection of the righthand wing '19 of the usual wing-scale 79. indicates the left-hand wing of said wing-scale, which is secured by means of screws 81 to a pair of lugs or flanges 82, projecting downwardly from the front frame-rail 83. The relative position of the operative end of said center'flnger 19 with adjusted by merely bending said upward profront of the machine, said rear part 11 is made foldable and is pivotally fastened to the remaining lower part 12 and to the end-plates 40 by means of two collar-screws 86 screwed in two cylindrical sockets 87 fastened to said end-plates 40 in any suitable manner. Thus this upper part 11 of the paper-table may be swung forward against the platen 13 as shown in Figure 10, so as to uncover the tabulating mechanism. This foldable part 11 of the paper-table is lined with a layer 88 of a noise-deadening material as; for instance, felt. The two sockets 87 act also as abutments to center the paper-table in proper align-- ment with respect to the platen 13. The lower part or apron 12 of the paper-tab is curled at its upper end for support by said collar-screws '86, and is freely supported at its lower end, at both'sides, by means of a pair of outwardly-turned flanges 89 of the brackets 52 and at the center by means of a down-turned projection 90 acting as a supporting footand resting on the carriage-base-plate 41. These two flanges 89 may be bent up to adjust the position of said lower end of said apron 12 with respect to the periphery of the platen, this foot 90 being then shortened or lengthened in a corresponding manner by being bent. A row of openings or clearances 91 is provided in said apron l2 for the rear feed-rolls 14, while the front edge thereof is provided with four notches 92 for. the front feed-rolls 15. The adjoining edges of the two parts 11, 12 of the paper-table include an intermediate or center part formed by an offset upward projection 93 of the lowerpart 12, carrying a flat spring- 94, and by a downwardly-projecting tan-portion 95 of the upper part 11,
which works into an'opening '96 of the part 12 and co-operates with the free end of said spring 94, so as to hold said upper part fast either in its normal or folded position.
The paper-table 11, 12 may thus be very easily dismounted and removed from the machine by merely unscrewing the two screws 86.
97 and98 indicate respectively the rear frame- 1. A typewriting machine comprising in combination, a supporting frame, a carriage traveling in said frame, a revoluble platen journaled in end plates of said 'c'arriag'e,-. releasable bottom feedrolls to co-operate witli said platen, a release mechanism for said feed-rolls having a ma; uallyoperated controlling member arranged to swing about the platen-axis for castingoff and restoring t e bottom rolls, a front bail pivotally mou nted on said end plates, auxiliary top rolls co-operating with the platen and adjustable along the rod of said bail, and a pin and-slot mechanical connection between said bail and said manuallyoperated controlling member, said member having a circular slot concentric with the platenaxis in which plays the pin of said connection which is arranged to cast off said bail upon movement of said member to releasing position and to leave said bail cast off upon restoration of said member.
2. A typewriting machine comprising in combination, a supporting frame, a carriage traveling in said frame, a revoluble platenmounted on said carriage, releasable bottom feed-rolls to co-operate with said platen, a release mechanism for said feed-rolls having a manually-operated controlling member, a pair of paper-fingers, lat-- erally-adjustable along a bar, pivotally mounted on said carriage separately from the lower feedrolls, a bail pivotally mounted separately from said bar on said carriage in front of said platen, and auxiliary front top rolls on said bail, said release mechanism, said paper-finger bar and said bail having connections whereby said bottom feed rolls, said top rolls and said paper-fingers may be simultaneously removed away from the platen by a single manual operation of said controlling member, said connections being arranged so that said top rolls may be cast off separately from said bottom rolls and paper-fingers.
3. A typewriting machine comprising in combination, a supporting frame, a carriage traveling in said frame, a revoluble platen mounted on said carriage, releasable bottom feed-rolls to 00-01)- er'ate' with said platen, a release mechanismior said feed-rolls having a manually-operated controlling member, a pair of paper-fingers, laterally adjustable along a bar, pivotally mounted on said carriage separately from the lower feed-rolls, a bail pivotally mounted separately from said bar on said carriage in front of said platen, and auxiliary front top rolls on said bail, said release mechanism, said paper-finger bar and said bail having connections whereby said bottom feedrolls, said top rolls and said paper-fingers may be simultaneously removed away from the platen by a single manual operation of said controlling member, said connections being arranged so that said bail or paper-finger bar may be shifted from the platen separately from the bottom feed-rolls and from one another.
4. A typewriting machine including, in combination, a carriage provided with end-members, a revoluble platen mounted on a shaft journaled in said end-members, releasable bottom and top feed-rolls and paper-fingers to co-operate with said platen, and a release mechanism for simultaneously releasing said bottom and top feed-' rolls and said paper-fingers and arranged so as not to be dismantled when said platen and shaft are removed from said carriage, said release mechanism including a manually-operable controlling membenone of said carriage-end members having a laterally-projecting boss surrounding said shaft, said controlling member being pivoted on the periphery of said boss so that its fulcrum is substantially coaxial with the platen-shaft to compact said mechanism and yet being operative when the platen-shaft is removed.
5. A typewriting machine comprising in com bination, a supporting frame, a carriage traveling in said frame, a revoluble platen journaled in' said carriage, releasable bottom feed-rolls to cooperate with said platen, a release mechanism for said feed-rolls having a manually-operated controlling member rotatable for casting off and restoring the lower feed-rolls, a front bail pivotally mounted in said carriage, auxiliary top rolls co-operating with said platen and adjustable along a cross-rod of said bail, a circular slot being provided in said manually-operated controlling member, said slot being concentric with the'axis of rotation of said member, and a link pivoted at one end on said bail and carrying at its opposite end a pin working in said slot.
6. A typewriting machine comprising in combination, a supporting frame, a carriage traveling in said frame, a revoluble platen journaled in end plates of said carriage, releasable bottom feedrolls to co-operate with said platen, a release mechanism for said feed-rolls having a manuallyoperated controlling member, a front bail pivotally mounted on said end plates, auxiliary top rolls on said bail, a pin-and-slot mechanical connection between said ball and said manually-op- "erated controlling member, effective to cause the top feed-rolls to be cast off with the bottom feedrolls and ineffective to return the top feed-rolls,
lugs on the end arms of said bail, and cylindrical torsion springs reacting against said carriage and having tails co-operating with said lugs, said tails, lugs, and the bail-pivots being relatively 8.1", ranged so that said top rolls are caused to be pressed bysaid tails against the platen in operative position of thebail and so that the bail is held by said tails in its idle or released position against a stop, the spiral bodies of said springs being wound around collar-nuts secured to said end plates. v
'7. A typewriting machine comprising in combination, a supporting frame, a carriage traveling in said frame, a revoluble platen journaled in end. plates of said carriage, two rows of releasable bottom feed-rolls carried by a front shaft and a rear shaft to co-operate with saidplaten, a.
manually-operated release lever for said feedrolls mounted on one of said end plates, brackets mounted on said carriage, a'cam-shaft journaled in said brackets and forming a unilateral line of cams, a link-and-crank connection between said lever and said cam-shaft, two-pairs of opposed levers mounted in said brackets and pivoted on opposite sides of said cam-shaft, both of a pair of said levers having inner arms extending toward and engaging the same cam, and four W- shaped springs wound around extensions of the pivots for said levers, said springs reacting against said carriage at one end and being hooked around the outer arms of said levers at their other ends, so as to yieldingly press said feed-rolls against the platen in normal position of said release lever.
8. A typewriting machine comprising in combination, a supporting frame, a carriage adapted to move to and fro along said frame, a revoluble platen mounted on said carriage, bottom and top releasable feed-rolls, a front scale andguidlng paper-fingers to co-operate therewith, a tiltable support for said front scale and said paper-fingers pivotally mounted on said carriage, a front shaft and a rear shaft to carry said bottom feed-rolls, two pairs of opposed pivoting levers to carry said two shafts, a cam-shaft controlling the release of said bottom-feed-rolls by swinging simultaneously said four levers, a projecting nose integrally formed in the front levers of each of said pairs of pivoting levers, and pull-springs anchored around said cam-shaft and acting on said tiltable support, so as to hold it constantly in abutting relation against said noses, in order that said paper-fingers to co-operate with the front part of said platen, a front scale, a tiltable support below the printing line for said paper-fingers and said front scale arranged in a substantially vertical position in front of said platen and provided with loose mortise-and-tenon connections to said base-plate, which act as pivots for said support with a minimum of friction, said tiltable support being actuable by said release mechanism, top rolls to co-operate with said. platen above the printing line, and a swingable bail, to carry said top rolls, arranged in front of the platen above said tiltable support.
10. A typewriting machine comprising in combination, a supporting frame, a carriage having a base-plateand two end plates and traveling in said frame, a revoluble platen mountedon said carriage between said end plates, a foldable paper-table including an upper part behind the platen,'said upper part swingable about pintles projecting from said end plates and also including a lower part supported by said pintles and resting upon said carriage, rear and front bottom feed-rolls to co-operate with said platen, a release mechanism forsaid feed-rolls, a pair ofguiding paper-fingers, a front scale, a tiltable support pivotallymounted in said base-plate below the printing line andoperatively connected to said release mechanism, said support carrying said front scale, and also supporting said paperfingers for lateral adjustment, a stationary guiding paper-finger carried by said supporting frame, a dismountable bail pivotally mounted on said end plates in front of said platen and operatively connectedto saidrelease mechanism, and three top rolls of oversize diameter adjustable along the rod'of said bail so as to co-operate with said three paper-fingers.
- 11. A typewriting machine comprising in combination, a supporting frame, a carriage having a base-plate and two end plates and traveling in lower part or apron of the paper-table, a release a mechanism for said feed-rolls, a pair 'of guiding paper-fingers, a front scale, a tiltable support pivotally mounted in said base-plate below the printing line and operatively connected to said release mechanism, said support carrying said front scale, and also supporting said paper fingers for lateral adjustment, a stationary guiding paper-finger carried by said supporting frame, a
, dismountable bail pivotally mounted on said end therod of said bail so as to co-operatewith said three paper-fingers, said paper-fingers reaching upwardly close to the points where the top rolls contact the platen.. 12. A typewriting machine comprising in combination, a supporting frame, a carriage'having a. base-plate and two end plates and traveling *in said frame, a revoluble platen mounted on said carriage between said end plates, a foldable paper-table in two parts, upper and lower, hinged together by means of pintles projecting from said two end plates, the lower partresting upon said carriage, rear and front bottom feed-rolls to cooperate with said platen, a release mechanism for said feed-rolls, a pair of guiding paperflngers, a 'front scale, a spring-pressed tiltable support carrying said paper-fingers and scale,
said support being pivotally mounted in said base-plate and being operatively connected to said release mechanism, a stationary guiding paper-finger carried by said supporting frame and slightly spaced from the platen-periphery to clearsaid pair of other guiding fingers as the carriage travels, a dismountable bailpivotally mounted on said end plates in front of said platen and operatively connected to said release mechanism, and three top rolls of oversize diameter adjustablealong the rod of said bail so as to co-operate with said three paper-fingers, said paper-fingers extending upwardly to reach closelyv the points where said top rolls contact the platen.
13. A typewriting machine comprising in combination, a supporting frame, a.carriage having a base-plate and two end plates and traveling in said frame, a revoluble platen mounted on said carriage between said end plates, a foldable paper-table in two parts hinged together and pivotally mounted on said two end plates; said table resting upon said carriage, rear and front bottom feed-rolls'to co-operate with said platen, a release mechanism for said feed-rolls, a pair of guiding paper-fingers, a front scale, a tiltable support carrying said paper-fingers and scale, said support being pivotally mounted on said base-plate and being operatively connected to said release mechanism, a stationary guiding paper-finger carried by said supporting frame, a
dismountable bail pivotally mounted on said end plates in front of said platen and operatively connected to said release mechanism, three top rolls of. relatively large, diameter adjustable along;
14. A typewriting machine comprising in com bination, a carriage, a revoluble platen therein, a paper-table having a stationary apron under the platen, bottom feed-rollsjmeans operable-to re,-, lease'said bottom feed-rolls, front paper-fingers, a support carryingsaid paper-fingers for lateral adjustment and pivotally mounted on said rear riage at points apart from and below said apron, said support connected to said bottom feed-rollrelease means so that said fingersmaybe released from said platen conjointly with said bottom feed-rolls, top feed-rolls, and a bail carrying said top feed-rolls for lateral adjustment and swing able to'move. the latter againstand from the platen, said paper-fingers terminating at their upper ends below the point where the top feedrolls contact the platen so that said paperfingers andsaid top rolls are independently ad- 'justable, one from the other, throughout the length of the platen.
15. A typewriting machine comprising in combination with a carriage 'and 'a revoluble platen therein, a stationary paper-guiding apron under the platen, a support, mounted in front of said platen and apart from said apron and pivotally articulated to the carriage-frame so as to be tiltable, front paper-fingers carried by said support, means operative to tilt said support about its pivots to bring the paper-fingers toward and from the platen, said paper-finger support having a portion abutting a stop apart from said apron to determine the normal position of said support and which portion and stop may be relatively bent for adjustment purpose, and spring-means drawing said support against said stop to determine the relative position of said fingers with respect to the periphery of said platen.
16. The combination with a revoluble typewriter-platen, of front and rear bottom feed-rolls cooperating with said platen, means for mount ing said feed-rolls including a plurality of pairs of opposite pivoted levers having. outer arms for supporting said feed-rolls, a cam-shaft, spaced supports in which said cam-shaft is journaled, said cam-shaft having, formed on one side only, lever-controlling cams, the levers of each pair being pivoted on studs extending from the same side of one of said supports and having inner arms extending toward and engaging the same cam which is limited in its extent toward said support-side so that the cam-shaft has a fully circumferential bearing in said support, said shaft being operable to turn said levers for simultaneously releasing or restoring the front and rear feed-rolls, and torsion springs for pressing the feed-rolls against the platen, each spring being coiled about an extension of one of said studs for support. j
17. The combination with a revoluble typewriter-platen, of front and rear bottom feedswingably mounted on the outer periphery of one of the platen-bearings so as to compact the mechanism by being coaxial with the platen-shaft and still be operative when said platen-shaft is removed, said'member having an upwardly-extending arm forming a finger-piece and also having an arm connected by a link and a crank to said cam-shaft;
18. The combination with a revoluble typewriter-platen mounted in a carriage having a base-member below the platen, and a fixed apron under the carriage of a line of bottom feed-rolls, a plurality of levers supporting said feed-rolls, a cam-shaft engaging said levers and operable to release and restore said feed-rolls from and to the platen, and a tiltable paper-finger support pivotally mounted on the carriage-base member apart from said apron, said support being springpivotally mounted on the carriage-base member apart from said apron, said support being springpressed toward and displaceable by said levers whereby, upon release or restoration of the feedrolls, the paper-fingers are also released and restored, said support having a loose mortise-andtenon connection with said base-member whereby it is pivoted upon said member.
20. In a typewriting machine, the combination with a carriage, a revoluble platen therein, feedrolls co-operating with the platen, and feed-rollrelease mechanism, of a front scale and paperfinger mechanism including a bar, a front paperscale on said bar, paper-fingers adjustable along said bar, downward extensions of said bar hav-- ing loose mortise-and-tenon connections to the carriage whereby said paper-finger mechanism is pivotally connected to said carriage, and
springs urging said bar to rotate about the pivotconnections thus formed to thereby draw said paper-fingers against the platen, said paper- .finger mechanism being releasable from said platen by said feed-roll-release mechanism. I
21. 'In a typewriting machine, the combination with a platen, of a folding paper-table including an apron slanting upwardly and rearwardly from the bottom of the platen and also including a leaf hinged to said apron at the rear upper edge of the latter to form a forwardly-foldable upward and rearward extension of the lower apron, a tongue being projected from said upper edge to underlie and support said leaf substantially even with said lower apron, a second tongue and a spring co-operating therewith being provided along the adjoining edges of. said leaf and apron to hold said leaf in normal or folded position, said second tongue and spring forming parts of said leaf and apron.
WILLIAM A. DOBSON.