US2260040A

US2260040A - Duplicating mechanism

Info

Publication number: US2260040A
Application number: US358406A
Authority: US
Inventors: Arthur J Levenhagen; Robert F Morrison
Original assignee: Ditto Inc
Current assignee: Ditto Inc
Priority date: 1940-09-26
Filing date: 1940-09-26
Publication date: 1941-10-21
Anticipated expiration: 1958-10-21

Description

Oct. 21, 1941.

A. J. LEVENHAGEN ETAL DUPLIGATING MECHANISM Filed Sept. 26, 1940 4 shetS-sheet 1 Ober Z'/7Zo'rrzson.

Oct. 21, 1941.l

A. J. LEVENHAGEN 'ET AL 2,260,040A DUPLICATING' MECHANISM Filed Sept. 26, 1940 4 Sheets-Sheet 2 ocpzl, 1941.

A. J. LEVENHAGEN ETAL DUPLICATING MECHANISM Filed Sept. 26, 1940 4 Sheets-Sheet 5 Ar r l SSS I'NVENTORS r ven/za gell.

jef/Mfg E5 www, @@fugg@ 0d.4 2l, v1941 A. J. LEVENHAGEN ET A1. 2,260,040

y DUPLICATING MECHANISM I Filed Sept. 26, 1940 4 Sheets-Sheet 4 Patented Oct. 21, 1941 Morrison, Oak Park, Ill., assignor to Ditto, In, corpcratcd, Chicago, Ill., a corporation of West Virginia Application September-26, 1940, Serial-No. 358,406

19 claims. (C1. 10i- 132) This invention relates to duplicating mechanismz and particularly to the mechanism for str-ipping copy sheets successively from the gelatin pad carried by the drum of a rotary gelatin duplicating machine, and it has for i'ts'object the provision of al new-and improved form'and arrangement of* partsA by which improved stripping of; the copyf sheets shall be attained.y

In gelatin machines ofv this type heretofore, aV driven roller has been provided in slightly spaced relation to the face of the drum, with cooperating means actuated in timed relation for pushing; the iorwardedge portion of a copy sheetfoutwardlyfrom the drum into operative engagement with` the driven Vroller for pulling the copy sheet loose from the gelatin pad for deliveryY toa tray. This cooperating means f or pushingthe end of the copyV sheet outwardly has been of various forms, comprisingv a, non-rotary pusher member; as shown by Hernlund, MarchevV and Morrison Patent No. 2,034,903, or a` roller las shown by Whitehead Patent No. 2,094,628. The non-rotary pusher member has been found preferablieY in some respects, in that it may be made of comparatively small size so as to be capable of entering the space between two forwarding rollers into close proximity to the bite of the rollers for pushing the end of a copy sheet definitely into the gripof the rollers. Great care hasv been necessary, however, in connection with 'Y arrangements of this type for preventing smearing of the copy sheets by pressure of the pusher member or members on the sheet after the Vsheet has been gripped by the cooperating stripping rollers.

For enabling us to use a non-rotary type of pusher member and still to avoid the danger of smearing the copy sheets, we have provided a form of mechanism comprising a plurality of spaced fingers carried by two swin'gingly mounted arms so as to be movable to the bite of the stripping rollers for carrying the end of the copy sheet into the desired operative position,v

together with means for giving the lingers an auxiliary movement with respect to said arms out of engagement with the copy sheet at just the moment when the sheet reaches the position at which it is gripped. In the improved arrangement illustrated, the fingers are mounted on a rock shaft carried by said arms `so that, upon a slight rocking movement of `the shaft, the lingers are swung in unison away from the copy sheet, one of the cooperating stripping rollpermitting suchswinging movement of the fingers. Y

I n the preferredr form of` the invention, the shaft bye-Which the. pusher, ngers are Carried is nrof.i 1,.e iV withk a plurality- 0f"V cylindral'body portions. rotatably mounted thereon so as to act as aroller member `for pressing the copy sheet against the'driven rollerA for assisting inthe stripping operation. Bythe u se of two rollers pressing the copy sheet into engagementwith the driven rollerat slightly spaced points thereabout, the grip on the copy sheet is greatly strengthened and the eiectiveness of the strippine mechanism is correspondingly increased- It is. another object of this invention to improve mechanisms of thisrtypevv in sundry details hereinafter pointed out. The preferred means by which the several objects have beenvattained are illustrated in the accompanying drawings,` in which- Fig. 1 is a longitudinal vertical sectional view through the preferred form of mechanism embodying the invention;

Fig, V2 -isga transverse vertical sectional view through-the machine taken substantially at the line 2 2 o f Fig. 1; l

Fig. 3 is an enlarged detail view, being substantially a section taken at the lineV 3- 3 of Fig. 1;

Fig; 4 is. a vertical sectional view s tantially at the line 4 -4 of Fig. 2;

Fig., 5 is a horizontal sectional view taken subs tantiallyl at the line 5,-5 of Fig. 4;

Fig. 6 is a vertical sectionalview taken substantially at the line 6- -6 of` Fig. v2; and

Figs. 7, 8 and 9 are views similar to a portion of Fig. 6, but showing changed position-s ofcertain of the parts.

Referring now yto the several gures of the drawings, in which `corresponding parts are in-` dicated'by the same reference characters, I5 and I6 indicate standards at opposite sides of the machine rigidly connected together for supporting a drum II by means of a supporting and driving shaft I8. In the arrangement shown, the shaft I8 is provided with -a large gear I9 iixedly mounted thereon, Which mesheswith a pinion 20 rotatably mounted uponY a stud 2| carried by the frame member I5. The pinion 2li-is rigidly connected `with a p ulley 22 which is driven by a belt .23 from a pulley 24 which in turn is driven by a pulley 25 and a belt 26 from any suitable source of power.

' As lis best shown in Fig 1 the drum II is taken subers being cut away opposite to the fingers for 55 cui;l away at one side to provide a recess in its wall at one side, as indicated at 21. Spindles 28 and 29 are provided in the drum 21 for supporting a gelatin band 30 wrapped about the circular Wall portion of the drum, as shown in said Fig. 1.

Above the drum I1, a table or tray 3| is provided for supporting a copy sheet 32 in position for delivery to the drum, as is well understood in machines of this type. A margin bar 33 is provided below the tray 3| in position for engaging the lower end of the copy sheet 32 for holding it in position to be applied to the gelatin band 36 for making the desired copy thereon.

As usual in machines of this type, the copy sheet 32 is pressed against the band 30 vby a vplaten roller 34 for insuring the production of the desired impression upon the sheet.

Inasmuch as the parts so far described form in and of themselves no part of the present invention, it is believed to be unnecessary to describe such parts. further in detail.

In connection with the machine, stripping mechanism is provided for engagingv a copy sheet carried around by the gelatin band and pulling the sheet off the drum for delivery into a tray 35 adjacent to the drum. This means lcomprises a stripping rollei` 36 rotatably mounted between the standards I and I6 by means of a shaft 31, which is continuously driven by means of a pinion 38 meshing with a large gear 39 mounted to rotate with the drum I1. The arrangement is such that as the drum rotates in counterclockwise direction in Fig. 6, the stripping roller 36 rotates in clockwise direction in said fgure. Above the roller 36, anV auxiliary stripping roller 40 is provided, 10- tatably supported in position by means of a shaft 4I mounted in the standards I 5 and I6, the roller 40 being in Yconstant engagement with the roller 36. Y

Means is provided actuated in timed; relationV to the rotation of the drum I1 for engaging the leading end of a copy' sheet 42 carried by the drum for moving the end of the sheet outwardly into the bite of the

rollers

36 and 48. This means comprises a heavy shaft 43 rotatablyrnounted between the standards I5 and I6, having arms 44 xedly mounted thereon at opposite ends of the drum, such arms being provided at their free end portions with a shaft 45 rotatably mounted therebetween. The shaft 43 is provided with a downwardly extendingarm 46 which is normally held swung to the limit of its outward movement by means of a heavy coiled spring 41 for holding the arms- 44 moved inwardly to the limit of their motion, as shown in Fig. 6. The shaft 43 is also provided with an arm 48 provided at its free end with a roller 49 which engages a cam 50 rigidly mounted upon the drum I1, as is clearly shown in Fig. 2. The shape of the cam 50 is such as to permit the shaft 45 and the arms 44 to move inwardly into the recess 21 of the drum as soon as the drum reaches a position for permitting such movement, and is of such shape as to force the arms and the shaft outwardly again by a quick motion at the' time lwhen the wall of the drum approaches into close proximity to the shaft, as shown in Figs. 6 and 7.

In the arrangement shown, the shaft 45 is provided with an arm 5I xedly mounted thereon, which is normally held by a spring 52 in engagement with a pin 53 carried by the arm 44, as shown in Fig. l6. The arrangement is such that upon the application of pressure upon the arm 5I toward the left in said Fig. 6, the shaft 45 is adapted to rock in counterclockwise direction in said figure for carrying the arm 5I out of engagement with the pin 53.

Upon the shaft 45, we have provided a roller member 54, formed in a plurality of sections. Between the roller sections 54, we have mounted pusher fingers 55 which are rigidly connected with theV shaft so as to rotate therewith. The fingers 55 are arranged in alignment with each other, pointing directly outwardly.

In operation, when the drum I1 reaches the position as shown in Fig. 6, with the ngers 55 positioned opposite to the extending end portion of the copy sheet 42, the roller 49 reaches the end of the low portion of the cam 50. Upon continued rotation of thedrum in counterclockwise direction in Fig. 6, the roller 49 and arm 48 move the shaft 43 in clockwise direction in said Fig. 6 for I bringing the fingers 55 into engagment with the copy sheet 42. As rotation of the drum continues, the fingers 55 cause the end of the sheet 42 to pass directly into the bite of the rollers 36 and 46, the roller 48 being circumferentially grooved at a plurality of points therealong, as indicated at.

56, for receiving the ends of the fingers 55 therein. At substantially the end of the outward movement of the fingers 55, a pin 51, carried by the arm 5I, is brought into contact with a set screw 58 adjustably mounted in an arm 59 carried by the framework, so that, upon continued outward movement of the arms 44, the shaft is given a slight rocking movement in counterclockwise direction against the action of the spring 52 for carrying the fingers in the direction away from the roller 36, such fingers being free to move upwardly within theigrooves 56 of the roller 40, as is clearly shown in Fig. 9. By this rocking movement of the shaft 45, the lingers 55 are prevented from pressing against' the copy sheet 42` and the roller 36, the'paper being thus protected against any tendencyto be smeared or torn when gripped between Ythe vrollers 36 and 48.

The arrangement is such that the roller 54 is brought into operative engagement with the roller 36 at the end of the outward movement ofthe stripper parts. The roller 54 thus cooperates with the roller 40 for pressing the copy sheet against the driven roller 36, so that the danger of any slippage of the copy sheet with respect'to the roller 36 is obviated, the copy sheet being held in engagement with the roller 36 through a substantialcircumferential portion of the surface of said roller. A Y l y l While we prefer to employ the form and arrangement of parts as illustrated and as above de-v scribed, the invention is not 'to be limited to the arrangement shown, except so far as the claims may be so limited, it being understood that changes might well be made in the form and arrangement of parts without departing from the spirit of our invention.

We claim:

1.v In a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, means for driving said roller, apusher member movably mounted on said frame adapted by outward movement in timed relation to the rotation of the drum to engage the forward end portion of a copy sheet f carried Vby the drum and to push the sheet outeedli wardly into engagement withwsaid drive'nfroller, means for moving said pusher memberoutwardly, means for pressing said copy sheet against said driven roller for pulling the sheet off thedruni, and means actuated in timed relation to the Youtwardmovement of the pusher memberforggiving the pusher member a slight rocking movement out of engagement with said copy Sheet. Y' 2. In a rotary duplicating yI nechanism, the combination of a frame, a drum rotatably'inounted thereon and -having a recess in its vface at one side of the drum, means for supporting a copy sheet releasably on said drum`with-its-for1 ward end portion extending over said; recess, a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, iriells for driving said roller, a pusher member movably mounted on said frame so as'to'be movable tan; gentially of said driven roller, adapted vby outward movement in timed relation to the rotation of the' drum to engage the forwardl end portion of a copy sheet carried by the drum and to push the sheet outwardly into engagement with said driven roller, means for moving Asaid pusher member outwardly, means for pressing said forward end portion of the copy sheet against said driven roller for pulling the sheetV off thedrum, and means for giving said pusher-member a slight rocking movement away from Ysaid driven roller as the pusher member comes to its outermost position for preventing the pusher member from pressing on said roller.

Y 3. In a rotary duplicating rniec'hanism, Ythe combination of a frame, a drum rotatably mounted thereon and having a recessin its face a-t one side of the drum, means for supportingf'a copy sheet releasably on said drum withY its for-4 ward end portion extending over said recess, a stripping roller rotatably mountedA on said frame in slightly spaced 'relation' to the drum, means for driving said roller, arms pivotally mounted on said frame at opposite ends'of Asaid drum, a pusher member mounted between said arms-so as to have a slight rocking movement with respect to the arms andarranged so that upon outward swinging movement of the arms said -p'u'sh'er member moves tangentially of the roller for carrying the forward end portion vof a copy sheet on the drum into engagement with said roller,

means for swinging said arms outwardly, means y for pressing said forward end portion of thecopy sheet against said roller `for pulling the-sheetv oi the drum, and means for giving said pusher member a slight rocking movement with respect to said arms away from said driven roller as the i pusher member comes to its`outermost position for preventing the pusher member from pressing on said roller.

4. In a rotary duplicating mechanism, the; combination of a frame, a drum rotatably mounted thereon and having a recess in its'fac'e at one side of the drum, means for'supportin'gia copy sheet releasably on said drum-'withits'for'` the rotation of thedrum ,for carrying said secondshaft intorand out ofthe recess of said drum, fingers iixedly mounted on said'secondshaft in position to engage vthe forward end portion of said copy sheet onv the drum upon outward movementorl saidsecond shaft for moving said copy sheet intoengagement with said roller, means for pressing said forward end portion o f the copy sheet against said 'roller for pulling the sheet off thedrum, Yand means forgiving said second shaft a slight rocking movement for carryingsaid'lngersaway from the roller as the ngers cometo their outermost positions for preventing the 1in-vr gersfrom pressing on said'roller. t t "'5'.' In` a rotary j duplicating mechanism, the combination of a frame, a drumrotatably mount'-r ed thereon andr havinga recess in its face at on'eiside of the drum, means for supporting a copy sheet'releasably on said drum with its for- Wardv end'. portion extending over saidk recess, a

' stripping roller rotatably-mounted onsaid frame 'severalsections of the pusher member'pos'itionedopposite@ to; the grooves f in *said second "roller,- meansjormoving said 'pusher member fo'utxirard-x ly, and means "actuated vin Atimed relation 'tofth'e outward movementA of* the vpl'isher memblerfor giving the-several sections of said' pusher-me if slight` rocking movement inthe grooves of said second roller away'ffrni'fthef first-namedroller` for" ,preventing the "pusher member from' pressing on said'iirstfnamed'roller.- L

c bin'atio of a'fifam'e,l adrum'k rotatably mounted'v thereon anvil'liavi'rig'l'afrefcess' -in "itsif'ace at one side of thedrun, means for supporting a copy sheet releasably on said drum with'its forward end portionextendinfg over said recess, a stripping'roller rotatablymounted onlsaid frame in slightly spaced relation to the drum, meansVfor driving said roller, a second 'roller rotatably mountedon said framein engagement with said first-named roller soY as to cooperate therewith for pulling a copy sheet off the drum, said roller being circumfe'rentially groove'd at a plurality of points therealong, a" shaftv movably mounted' on said frame so' as to bemovable toward and' from the bite ofsaidtwo rollers and so as to be rocked slightly with respect to its supporting means, fingers `V"on said shaft'in position-tofenter the grooves'ofsai'd second' roller'adapted by 'outwardV rnovf'ernent'v intime'd relationtothe rotation' of the drum to engage the forward end Iportion of a-copyf sheet on the drum and to push: the sheet outwardly into the bite ofsaidtwo rollers, rn'eans for inoi'fing said vshaft and ngers outwardly,"and me'ansfactuatd in timed relation tothe outward movement of the shaft and fingers for giving the shaft aslight rocking movement for swinging said fingers in said' grooves away from' the first: namedy 'rolleri for preventing the fingers from' pressing on said'rst-named roller. i ier-f7( In a rotary "duplicating mechanism, the' `In Va'rotaryduplicating mechanismj the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting ra copy sheet releasably on said drum with its forward end portion extending over said recess, a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, means for driving said roller, a roller member movably mounted on said frame so as to be movable outwardly toward'said first-named roller in substantially a tangential direction with respect to said rst-named roller so as to engage said roller at the -limit `of, its outward movement, a pusher member svvingingly mounted with respect to said second roller member adapted upon the outward movement of said second roller member in timed relation to the rotation of the drum to engage the forward end portion of the copy sheet on the drum and to move it outwardly into engagement with said first-named roller into position to be engaged between said two rollers, and means for giving said pusher member a slight rocking movement away from said first-named roller at the endwof the outward movement of said second roller member for preventing said pusher member from pressing on said first-named roller.

8. vIn a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum,. means for driving said roller, a shaft movably mounted on said frame so as to be movable outwardly toward said first-named roller in substantially a tangential direction with respect to said rstnamed roller, a plurality of roller sections rotatably mounted on said shaft so as to engage said first-named roller at the limit of the outward movement of said shaft, a plurality yof pusher fingers fixedly mounted on said shaft between successive roller sections adapted upon the outward movement of said shaft in timed relation tothe rotation of the drum to engage the forward end portion of the copy sheet on the drum and to move it outwardly into engagement with said first-named roller into position to be engaged between said two rollers, and means for giving said pusher fingers a slight swinging movement away from said first-named roller at the end of the outward movement of said shaft for preventing said lingers from pressing on said first-named roller.

9. In a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with itsv forward end portion extending over said recess, a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, means for driving said roller, arms pivotally mounted on said frame at opposite ends of said drum, a shaft mounted between said arms `so as to have rotary movement with respect to the arms and arranged so as to move with said arms outwardly toward said first-named roller in substantially a tangential direction with respect to said first-named roller, a plurality of roller sections; rotatably mounted on said shaft so as to engage said firstnamed roller at the limit of the outward movement of said shaft, a plurality of pusher lingers xedly mounted on said shaft between successive roller sections adaptedupon the outward movement of said shaft in timed relation to the rotation of the drum to engage the forward end portion of the copy sheet on the drum and to move it outwardly into engagement with said firstnamed roller into position to be engaged between said two rollers, means for holding said ngers normally in predetermined position with respect to said arms but adapted to yield for permitting a slight swinging movement of the fingers, an arm extending from said shaft, and adjustable means carried by said frame adapted by engagement with said last-named arm at the end of the movement of said shaft outwardly to rock said shaft and said fingers in the direction away from said first-named roller for preventing said ngers from pressing on said first-named roller.

10. In a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, means for driving said roller, a second roller rotatably mounted on said frame in engagement with said first-named roller so as to cooperate therewith for pulling a copy sheet off the drum, said roller being circumferentially grooved at a plurality of points therealong, a shaft movably mounted on said frame so as to be movable toward and from the bite of said two rollers and so as to be rocked slightly with respect to its supporting means, lingers on said shaft in position to enter the grooves of said second roller adapted by outward movement in timed relation to the rotation of the drum to engage the forward end portion of a copy sheet on the drum and to push the sheet outwardly into the bite of said two rollers, means for moving said shaft and fingers outwardly, roller sections rotatably mounted on said shaft between said fingers in position to engage said firstnamed roller at the end of the outward movement of said shaft, and means actuated in timed relation to the outward movement of said shaft and fingers for giving the shaft a slight rocking movement for swinging said fingers in saidl grooves away from the first-named roller for preventing the lingers from pressing on said first-named roller.

11. In a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, means for driving said roller, arms pivotally mounted on said frame at opposite ends of said drum, a shaft mounted between said arms so as to have rotary movement with respect to the arms and arranged so as to move with said arms outwardly toward said first-named roller in substantially a tangential direction with respect to said firstnamed roller, a plurality of roller sections rotatably mounted on said shaft so as to engage said first-named roller at the limit of the outward movement of said shaft, a plurality of pusher lingers xedly mounted on said shaft between successive roller sections adapted upon the outward movement of said shaft in timed relation to the rotation of the drum to engage the forward end portion of the copy sheet kyon the drum and .to move it outwardly into' engagement with said first-named rollerinto position to be engaged between said two rollers, y'means for holding said Afingers nornfially, in predetermined position with 'respect to said arms but adapted to yield for permitting a'slight swinging movement vof the fingers, an arm extending'. from said shaft, adjustable'. .means carried 4by said frame adapted by engagement with said lastnamed arm at the end of .the movementv of'said shaft outwardly to rock said shaft and said ngers inthe direction away'from said first-named roller for preventing said 'fingers from pressing on said first-named roller, and a third'roller rotatably mounted on said frame in engagement with said first-named roller and circumferentially grooved at a plurality of points therealong opposite to said ngers so as to permit said fingers to approach into close proximity to the 'bite Vof said first-named roller and said third roller and to have the required swinging movement away from said rst-named roller. Y f v 12. In a rotary duplicating mechanism, Vthe combination of a frame', a drumA 'rotatably mounted thereon and having a recess .infits face at one side of the drum', means for supporting a copy sheet releasably on said drum with its'forward end portion extending over said recess, a stripping roller rotatably mounted on said'frame in slightly spaced relation to the drum; means for driving said roller, a second roller rotatably mounted on said frame in engagement with said first-named roller so asv to 'cooperate therewith for pulling a copy sheet oli thedrum, said'roller being circumferentially grooved at a plurality of points therealong, a shaft rotatably mounted on said frame adjacent to said roller, arms' carried by said shaft at opposite ends of said drum so as to swing in unison about said shaft', a second shaft mounted between said arms so as' to have rotary movement with respect to the arms and arranged so as to move with said'arms toward and from the roller tangentially ther`eof,`mean s for moving said arms in timed relation to tlie rotation of the drum for carryingfs'aid second shaft into and out of the recess'of "said 'Ydrum, fingers fixedly mounted 'on said secondsh'aft in position to engage the forward end'portion Fof said copysheet on the drum upon outward'movement of said second4 shaftf'for rnoving said copy sheet intol the lbite of'sa'id'ltwo rollers with the fingers entering the grooves in said second roll-v er, and means for givingY said second shaft a slight rocking movement for carrying said fingers away from the first-named roller as the fingers come to their outermost positions for preventing the fingers from pressing on said firstnamed roller. Y

13. In a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, a stripping roller rotatably mounted on said frame Yin slightly spaced relation to the drum, means for driving said roller, a shaft rotatably mounted on said frame adjacent to said roller, arms carried by said shaft at opposite ends of said drum so as to swing in unison about said shaft, a second shaft mounted between said arms so as to have rotary movement with respect to the arms and arranged so as to move with said arms toward and from the roller tangentially thereof, mea'nsfor moving said arms in timed relation lto the k'rotation of the drum for carrying said second shaft into' and out of thel recess of said drum, fingers Xedly .mounted on said second shaft in positionto engagethe forward end portion of said copy sheet"'on the' rdrum upon outward movement of said second shaft for moving said copy sheet intoengagementwith said roller,`rol1erme'ans rotatably mounted on saidsecond shaft'in position tohaveoperative engagement with said first-named roller when said second shaft reaches its outermost position serving to cooperate with said first-named roller for pullingthe engaged copy sheet off the drum, and means for giving said secondshaft a slight rocking movement for vcarrying lsaid fingers away ffrom lthe first-named roller as the fingers come tov their outermost positions vfor preventing the fingers from v'pressing on said first-named roller. V14. Inv a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a` recess 'in' its face at one side vof the drum, means for supporting a copy sheet releasably on said'drum with its 'forward end portionr extending over vsaid` recess, a stripping roller rotatably 'mountedon said frame in slightlyspaced relationftoY the'drum, means for driving vsaid rroller;ase'condroller rotatably mounted on said frame Ainengagement with said first-named roller so as to cooperate therewith for pulling4k a copy sheet off ltheedrum, said roller being circumfentially-groovedat'a plurality of'points thereal'ong, av shaftr'otat'abl'y mounted on said frame adjacent to 'said roller, arms carried by said'shaft `at opposite endsof said drum so as tolswing in unison about "said shaft, a second shaftnounted between said arms so'as to have rotary movement with respectto the arms and arranged soas'to move with'sai'd arms toward and from the roller t'angentially thereof, means fon moving said"'armsfin`.timed relation to the rotation of the drum'for carrying said second-shaft into and out of the recess of said drum', fingers Iixedly mounted on said second-shaft in position to'v engage the'fow'ard end` portion of said copy sheet onthe drum upon outward-movement of said "second shaft for movigfsaid copy-sheet into the #bite-"of lsaid two rollers with'the' fingers entering the gro'oves'in said second roller, roller means rotatablyy mounted 'onfsaid'sec'ond shaft "inlposition' to have 'operative engagement with said rst-named roller when said second shaft reaches its outermost position serving to cooperate with said firstnamed roller and said second roller for pulling the engaged copy sheet oif the drum, and means for giving said second shaft a slight rocking movement for carrying said ngers away from f the irst-namedroller as the fingers come to their outermost positions for preventing the fingers from pressing on said first-named roller.

15. In a rotary duplicating mechanism, the `combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, a

of said two rollers, means for moving said pusher member outwardly in timed relation to the rotation of the drum, and a third roller movable outwardly with said pusher `member adapted by pressure outwardly on said driven roller `to reinforce thegrip on said copy sheet-for `assisting in the stripping operation.

16. Ina rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a Vrecess inits face at one side of the drum, means for supporting .a copy sheet releasably on said drum with Aits forward end portion extending over said recess', a stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, means for driving said roller, .a second roller rotatably mounted in engagement with said first-named roller, pusher means comprising a plurality of outwardly extending lingers arranged in substantially spaced relation to each other longitudinally of said rollers and movable outwardly on said frame for pushing the forward end portion of a copy sheet on the drum into .the .bite of said rollers, means for moving said pusher means outwardly in timed relation to the rota-4 tion of the drum, and a third roller movable outwardy with said iingers in position `to press .the copyagainst 4said driven roller in spaced relation to said second roller Awhen said copy sheet has passed into the bite of saidiirst-named two rollers. v

17. In a rotary duplicating mechanism, the combination of a frame, a drum :rotatably mountedthereon and having a recess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, al stripping roller rotatably mounted on said frame in slightly spaced Vrelation to the -Vdrum, means for ,drivingA said roller, other Yroller means cooperating with said iirst-,named roller to grip a copy sheet for stripping it from the drum,

pusher means comprising a plurality of outward-V ly extendingl iingers movably supported jon said:

frame independently of the drum and arranged in substantially spaced relation'to eachother longitudinally of said roller. and Inovableout-A wardly on said frame into close proximity to. the line of contact of ,saidother roller means with said firsts-,named roller for pushing the forward end portion Vof a copy sheet on Vthe drum into engagement with said driven roller, and means soA for moving said pusher means outwardly in timed relation to the rotation of the drum. Y

18. In a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having a recess in its face at one side of the drum, means for supporting a copy sheet `releasably onsaid drum with its forward end portion extending over said recess, a Vstripping roller rotatably mounted on said frame'in slightly spaced relation to the drum, means for driving said roller, a second roller r0- tatably mounted in engagement with said firstnamed roller and having a plurality of circumferential grooves thereabout in spaced relation to each other longitudinallyof the roller, pusher means comprising a plurality of outwardly extending flngers movably supported on the frame independently of the drum and arranged in spacedY relation to each other and movable outwardly into said groooves into close proximity to the line of contact of said two rollers for pushing the forward end portion of a copy sheet on the drum into the bite of said rollers, and means formoving said pusher means outwardly in timed relation to the rotation of the drum.

19. In a rotary duplicating mechanism, the combination of a frame, a drum rotatably mounted thereon and having arecess in its face at one side of the drum, means for supporting a copy sheet releasably on said drum with its forward end portion extending over said recess, vaV

stripping roller rotatably mounted on said frame in slightly spaced relation to the drum, means. for driving said roller, a second roller rotatably mounted in engagement with said first-named roller and having a plurality of circumferential grooves thereabout in spaced relation to each other longitudinally of the roller, pusher means comprising a plurality of outwardly extending lingers arranged in spaced relation to each other and movable outwardly into Vsaid grooves for pushing the forward end portion of a copy sheet on the drum into the bite of said rollers, means for moving `said pusher means outwardly in y timed relation tothe rotation of the drum, -andV a third rollermovable outwardly with said fingers in position to press the copy sheet against said driven roller in spaced relation torsaid grooved roller when said copy sheet has passed v into the bite of `said first-named two rollers. ARTHUR J. LEVENHAGEN. ROBERT F. MORRISON.