US2012105A - Duplicator - Google Patents

Description

Aug.` 2,0, 1935.l A. MARcHEv DUPLIGTOR Aug. 20, 1935. A. MARcHEv 2,012,105

f 4DUPLIczAToR Filed June 13, 1932 5 sheets-sheet 3' fred Marc 71 e y.

Aug. 20, 1935. A. MAR-H'Ev 2,012,105

A' DUPLICATOR Filed June 13, 1932 5 sheets-sheet 4 75 2 :lim 8 l IIIII Aug. 2o, 41935. A; MARCHEV 2,012,105

' DUJPYLICATOR Filed June 13, 1932 `5 Sheets-Sheet 5 .fNEED-'STAT Patented Aug. l20, reas gemas pnrnrca'ron. Alfred Marc-hevQLa Grange, Ill., assigner to Ditto Incorporated,` Chicago, Ill.

.Applicatipn June 1 a corporation of 1932', serial No. 616,936

29 claims. (cl. roi-132) The invention relates to duplicating -machines and is particularly adapted to be embodied in rotary duplicating machines of t 'type which are provided with gelatine bands o receive im- 7 D pressions from master sheets, whichv impressions are imparted Ysubsequently to blank sheets brought into contact with the gelatine surfaces.

The primary objectfoffthc invention is to pro.-

. vide a rotary duplicating machine of the charl acter 4described which is compact, durable, efli'- It is. also an object of the invention to have v each of the mechanismsenumerated above, oon-. structed in' such manner that vit willen-operate' eiiiciently with the other mechanisms'to insure that the machine will operate continuously and 's'atisfactorily, each mechanism being also con-f ...structed so-that it may be adjusted or manipu lated quickly and easily byA the ope'rator.v ,For example, the improved machine'preferably com- 'prises means for positively alinirigv the blank 1 sheets with the gelatine band and also preferably 35 comprises improved mea-ns for drawing' the vgelatine band taut on the impression surface of the impression drum. Likewise, the 'machine'pre'ferably comprises improved means whereby it may be adjusted so that it may be fed by hand. Other objects and advantages will'become-ap-- parent -aslthe following detailed-description progresses,-referencebeingfhadtothe accompanyving drawings .'wlierein-- j Fig. 1 is'a plan view of a rotary. duplicatingV ma. '45 chinewhichernb'odies the invention.

. 1ig.2fis asection takenonline 2 -2 of l: l' f Fig. 3 is an-end elevation-of the improved malv` chinel looking at the .e I

l sheets are'fed. .l

Fig. 4 is a section taken on line IJ-l of'Fig.2. Fig. 5 is a section taken' on une s-asfof Fig 3,- Fig. 6 I'is -a fragmentary section taken on line 6-6 of Fig.-9.

Fig. 7 is a fragmentary se ction ta eri on sub? '55 stantiauy the same une asrig. 5 an illustrating.

` The inventionresides primarily in a combina- *'The opening in thedrumis d e nd intov.which the blank vthe manner in which the printed sheets are stripped from the gelatine band. 8 is'a section takenon line 8 -8 of Fig. 3.

-.Fig. 9 is anielevation of theprinting drum and the parts carried thereby. 5 Fig. 10 is a fragmentary perspective view ofl mechanism for stripping the printed sheets from the gelatine band.

' Fig. 11 is afragment'ary tine band; and Y Fig. 12 is a perspective view of Aa manually op# -erable device for adjusting the machine so that. 'itmaybe fed byhand.

- Referrin 'Ito the drawingswherein a preferred embodime t of the invention is illustrated, ythe 15 reference character 20 designates generally a ,frame which comprises side-frame members 2l and 22* thesemembers being secured in spaced relation to each other by a bracket 23 and angle rirons 24. (See Figs. 1 and 2;) Also, extending be- 20 tween the side frames 2| and 22 is a sheet metal guard 25which is omittedfrom Figs. 1 3, and 4 so that certain details of construction may be shown to better advantage.- The guard -25 comprises a body portion 25a extending from one side 25 frame to the .other and formed integral with the bcdy/ portion25a are bentportions 25h and 25o which conceal' certain'gears and cams forming' rparts 'o f thefimproved machine.

Rotatably journaled in the side frame vmernloers. ,3 f. 2l'and 22 isa 2'| with whichan impressionV drum is constrained torotate, the impression drum` being designated generally by the reference character 2 8. Asbest shown in Figs. 5 vand 9,1the impression drum28 comprises spaced discs v3l) and 35 3l having inwardly. extending flanges 30af and 3 la, respectively, `to Vwhich -an arcuate impression member 32 is welded.;` It will be noted that thearcuate impressioninember 3 2.extends only -partly around the c' cumferenceo'f the drum 28 so that 40 access maybe had to the interior ofthe drum.

'signated by the perspective of the gelareference character 33.

The arcuate member-'32 preferably provided with aplurality of` perforations 3# for apurposev 45.

which vlilll ,be explainedpresently. At its longitudinallyiextending edges, vthe arcuate member 32 is provided with 4integral inwardly vextending anges 35 .and'36, the flange '35being provided. Witha plurality' of apertures 31 through which. 50

,a pluralityof .sheet-stripping ngers38 project. A gelatine band 4 0 is drawnf taut acrossthe outer surface of the'arcuatemembery 32'. `The gelatine band comprises the usualfabric 4| -with a coating 4 2 yof gelatine. VIt willtbe noted that the ends/.5.5

of the fabric 4| project beyond the coating 42 ,and are provided with holes 43 through which the sheet-stripping fingers 38 may project. Metallic strips 45 of identical construction are xed to the ends of the fabric 4| and are provided with in-l tegral fastening lugs `or hooks 41 adapted to engage the free edge of the flange 35 and the free edge of a flange 49 formed integral with a sleeve 50 journaled on a shaft 5|, the ends of the shaft 5| being secured in the discs 30 and 3|. A ratchet 52 formed integral with or secured to the sleeve 59 isengaged by a pawl 54 which is pivoted intermediate its ends by a screw 55 projecting from the inner surface of the disc 3|. (See Fig. 6.) One end of the pawl 54 is provided with a finger piece 58, `the other end nf -the pawl being secured to one end of a spring 51 which has its other end secured to a pin 58 projecting from the disc 3|. f A,lever formed integral with or secured to the sleeve 50 provides means whereby one may rotate the sleeve 50 -and the ratchet 52 in a counterclockwise direction (Fig. 6), to draw the gelatine band 40 taut on the arcuate member\32, the sleeve 50 and the ratchet 52 being retained in their adjusted positions by the pawl 54 and the action of the spring 51. band 40 is to` be applied to the arcuatemember 32, one end of the band is first secured to the- 50 and the `ratchet 52v in the] same direction until the band is drawn taut upon the arcuate member 32. The apertures 34 provided in the arcuate member 32 permit air to escape .therethrough while the band is being fitted to the 'arcuate member. This prevents the duplicating surface of the band 40 from being distortedby bubbles of airl trapped between the band and the arcuate member.

Detachably secured to one end of the shaft 21 is a crank E2 wherebyA the operator may rotate the shaft 21 to actuate the machine. It will be readily imde'rstood, however, that in some linstances the crank 52' will be replaced by an electric motor (not shown) operatively connected to the shaft 21 so that it will be unnecessary for the operator to drive the machine. l

A gear 55 is secured to the disc 30 by means comprising screws 66 and spacing sleeves 51, and

` meshing with the gear is an idler pinion 68 which meshes with a pinion 69 fixed to a shaft 10 rotatably journaled in the 'side frame members 2| and 22. The shaftl 10 carries a feed roll 1| which maybe formed offany suitable material but is preferably formed from rubber. The feed roll l 1| is disposed over the inner'endof a tray or feed table 13 adapted to holda supply vof p'aper'which7 isl shown at 14 in Figs. 2 and 5. The feed table 13 is provided with laterally extending pins 15 which pivot the table in notches 1'6 formed in the side frame members 2| and 22, the construction being such manner with respect to the pins 15` that its inner end overbalances its outer end, particularly .so when a pile of .paper is deposited on the feed;

table. A plate y8| Asecured to the inner end of the .table has a. lug.8|a with which the free end of a. l

which bears against the outer end of a tube ||4 lever 18 has a pin and slot connection.

The lever.

When the gelatine I 18 is secured to a shaft 19 journaled in'the side frames 2| and 22. V

The feed table 13 is provided with longitudinally extending guide members 83 andY a transversely extending guide member 84.v ' Ihe guide members 83 and 84 are secured adjustably to the feed 4table 13 by 'bolts 85 and knurled nuts'86, the table being provided with slots 88 through which the. bolts pass.. The guide members 83 and 84 hold the paper 14 in place on the feed table.

A ratchet segment 90 secured to the shaft 19 is engageable bya pawl 9| pivoted to one end of a lever 92 which is pivoted intermediate its ends by a. pin 93projecting from the side frame one end secured to the lever 92 and its other 'end secured to a pin 0| which projects vfrom the side frame member 3|. 'I'he spring |00 yieldingly urges the lever 92 in a counterclockwi se direction (Fig. 2) around its pivotal axis to hold the roller 95 in contact with the cam A96. The vcam 95 is provided with a.r relatively at surface |04 and with an'arcuate surface |05 which is `concentric With the axis of rotation of the shaft 21. When the roller 95 rides' up on the flat surface |04, the lever 92 lifts the pawl l9| bodilyA away `from the ratchet member 9 0, the pawl 9| beingv the roller 95 rides upon the dwell |05 and the pawl 9| engages and displaces ,the segment 90 angularly in a counter-clockwise direction (Fig. 2) so thatthe free end of thelever 18 displaces the inner end of the feedv table 13 downwardly.

Then when the roller 95 leaves the dwell |05 and again passes to the at surface' |04, the pawl 9| is disengaged again from the ratchet segment 90 and the ratchet segment 90 is displaced angularly `in a clockwise Vdirection (Fig. 2) by the spring ||0 and the free end of the lever 18\raises the tol rinner end of the feed table `13 to bring the nextl sheet of paper into contact-with the feed roll 1|.

This sequence of operation is continued as long. 'as necessary to obtain the desirednuxnber of,

duplicates.

The disengagement of the pawl from the ratchet segment 90 while the feed table 13 is being displaced to free the uppermost sheet vof paper into contact with the feed roll 1| permits the mechanism to adjust itself automatically so that the pawl9| will advance along the teeth of the ratchet member 90 as the supply of paper upon the feed table dwindles.VY This 'insures that the uppermost sheet will be brought into contact with the feed roll during'each cycle of operation.

The spring ||0 has one end'secured to a pin projecting from the ratchet segment 90,.the

other end ofthe spring4 ||0 being secured to a pin ||2 screw threaded, through a nut ||3 toward the margin bar |16.

aclaren. prjecnng'fmm the bracket 23. (see'Fig: 2.)

A pin |'projecting from the pin 2 ridesin a slot |5a fo-rmed in the wall of the tube, ||4 and prevents'- rotation of the pin |2 around its longitudinal axis. Obviously, the nut ||3 may be manipulated to adjust the tension of the spring ||0'. v

As best shown in Figs. 2l and 5, the inner ends of the paper sheetsv 14 abut against a sheet separating plate |20 whichs provided with a sur- `face |2| making a small angle lwith the vertical,

the construction being such that when the sheets .of paper are advanced toward the margin bar H6, the inner ends thereofslideup along the surface. |2| which terminates in an arcuate surface |22. The arcuate surface |22 terminates in anv edge |33 and beyond this edge,the sheet separating plate |20 is provided with 'a surface 'l 34 which makes a greater angle with the vertical than the surface 2|. If,`.when the uppermost sheet is advanced, other sheets also tend to ad- Vance, the surfaces |2| and |22 of the 'separating plate separate the innei` ends of the sheets in such manner that'only the uppermost sheet passes overthe edge |33 and along the surface |34 As soon as the uppermost sheet engaged the margin bar ||6 Ainthe manner illusof paper -has trated in Fig. 5, it is clamped between the upper pass freely between them -as edge of the separating plate'l20 anda grippingv or clamping plate |36, which is secured to a rock shaft |31 pivoted in the side frame members 2| and 22. When the paper is clamped in this manner between the separating plate |20 andthe gripping or clampingplate 136, itv cannotf slide backc over the separating plate |20 away from the |46.' AWhen .the lug 40 is disposed. in the notch |44 as illustrated in Fig. Spa spring |41 yieldlngly urges 'the lever |38 ina. clock-wise direction `(Fig. 8) so that the gripping' or clamping plate |36 clamps a sheet of paper totheupperedge of the separating plate |2| as explained above. The

spring|41 has one end secured to the lever |38, -the other end thereof bj'eingvsecuredl to a pin |48 which projectsjfrom'the side frame member The. cam 1|4| rotates in a conter clockwise di# rection (Fig. 8) so that the lug |40 will ride up on the dwell |45 af-ter it passes from the notch |44. .'Ihisdisplacement ofthe lugf|40 and the lever 38wil1 cause the gripping or clamping platev |36 to be displaced angularly through la small angle so, that the sheet of paper disposed between the gripping or clampingplate and the separatingplate may advance freely with the gelatin band as hereinafter. explained. The 'Y clamping and separating plates thenfunction as guides for the paper. When-the lug |40 rides up on. the dwell |46; the gripping or clamping. plate and the separating plate are separated: widely so that the followingfsheet of paper'may. v

A lever |50 secured to The cam 4| is provided'with a-deep it is advanced to the Figs. s and 12.) vThe shaft, |54 is journaled in the side frame members 2| and 22 and is provided -with alever' |51 whereby `it may bedisplaced angularly to havev the eccentric |52 angularly displace the lever |50 to the position wherein it is shown in dottedlines in Fig.- 8 so ,that the lug |40 will be brought 'out of the pathof the cam |4| and the gripping or clamping plate |36-- will be held in-a position wherein it is spaced widely from the sheet-'separating plate |20. rvs/hen 613e shaft |54 is displaced angmarly in the manner described above `to hold the lgripping -oi' clamping plate] |36 in its functionally inopl erative position, the crank portion |55 of theshaft disposed above an eccentric |52 mountedon a shaft |54 which is bent between its ends tprovide an` eccentric portion |55. (See |54 engages th lever 18 and holds it in a position Awherein itis shown in dottedy lines in Fig. 5 s that it cannot oscillate the feed table 13.v This adjustnnt permits one to feed `the paper by hand to the marginbar li I6. l

` The sheet-separating plate is secured rigidly to a bar |60 which is provided with .trunnions l 6| at its ends, the trunnions |6| being mounted in' holes drilled in the side frame members 2| and 22.' Nuts |65 screw threaded upon the ends of and 'the @niet separating platel |20 inl adjusted positions.v

yA shaft-|81 journaled inthe side framel members 2| and 22 is provided witha platen oripresthe trunnions 6| are adapted/to hold the bar |60 sure roll |68 which is..preferablyv formed from' rubber,v or the equivalent. Itvwill bereadily understood that when therimpression drum 28 ro'- -tates'in a counter clock-Wise direction (Fig. 5), vvthe gelatine band' 40 will co-operate with the pressure roll '|68 to seizefilie sheet of paper extendingfover the pressure roll as illustrated in gFig". 5 and will'advance the sheet in such manner 'that the data or design upon/the gelatine band 4o.

will be duplicated upon it in a manner well -known tothose skilled in theart. v

Pivoted upon the shaft |61 is a 'U-shaped' bar |10 tofwhich the margin bar I6 is'secured. 'A- spring |12 has one'endsecured tothe bar |10 and hasits other end secured tothe pin |49. (See rig. s.) As best shown in Fig. 2, one' end'of the v v b ar |10 slotted as at |14 to receive a pin |15 which projects. from a lever '|16,' the lever |16v being pivoted ona pin |18 which projects from the side frame member 22'. 'A roller .|80 carried shaft- 21. The'cam `I 82 is formed with a long dwell l83'which is concentriewithits axis of rotation.

The cam is also provided with va dwell |84. When' the roller rides upon the'dwell |84, the margin bar ||6 is held in the-position wherein it is shown in full lines in Fig.v` 5 -so that it will be en'- gaged by a sheet of paper 14 advancedv by 'the feed roll 1|., When the ^rller |80 rides upon the dwell |03, the margin bar. |6 will bra-disposed inthe. position whereinv it is shwn linl dotted lines in Fig. -`5. Aln the'latter position, the margin bar 65v The roller |00 is held in engagement with the ||6 clears the drumf28.

cam |82 by a spring |86 which has one e'nd se' 4cured to the lever |16. the' other end of the spring being secured tofa pin side frame 22.

.A bar. fsu has one endrig1d1ysecured-tdthe 8 8 projecting from the.v

lever |16, thev othergend Iof the bar'|90 being .drum 28 makes a complete revolution. `The lever provided wah-a laterauy projecting iug m which angularly displaces a lever |82 each time the 7 ping fingers 38 are formed integral with a plate' gear .238 meshes with the gear 65.l 10 200 which is secured toa rock shaft 20| pivoted When the .duplicated sheets are pulled from' in the discs 30 and 3-|. A spring 202 wound the gelatinized surface of the drum 28 by the rolls around the shaft 20| yieldingly urges the shaft 220 and 22|, they are 'delivered to a Itable 240 and kthe lplate 200 in a counterclock-.wise direclwhich is detachably secured to the side frames tion (Figs. 5 and'?) so that the free ends of the 2| and 22. Thus, as best shown in Fig. 2, the 15 stripping vfingers 38 do not project beyond the table `240 preferably comprises a sheet metal circumference of the drum 28 until the shaft 20| stamping r,to which plates 242 are secured, kthe is displaced angularly by a Vcam member 204 plates 2 42 being provided with outwardly extendfixed to the rock shaft 205 which is pivoted in the i ing 4pins 243 engageable with slots 244 provided in side frames'2l and 22. The cam member 204 is the side frames 2| and 22. The upper edges of 20 engageable with a bent bar 201 fixed to the shaft the plates 242 are adapted to engage the bottom i 20|. The construction is such ithat when the edges of the bracket members 226 to hold the drum28 carries the shaft 20| and the bar 201 table. 240 in the position wherein it is shown in past the cam member 204, the cam, member is- Fig.,l 2. The table 2'40 i's provided with guide .I places the bar 201 and the Shaft 20| in a ClOGkmembers 246 which are adjustably secured to vthe 25 WiSe CliIeCiOrl (Figs. 5 and 7) against the aCtiOn' table by screws 248 and knurlednuts 249. These of the SpringA 202 S0 that the Stripping flngelS guides engage the side edges of the duplicated 38 are displaced outwardly as illustrated in Fig. 7 sheets as tley are fedy onto the table 240 and to deectA the forwad end of a sheet of. paper arrange the sheets in a neat pile on the table. 14 adhering t0 the gelatinized 'surface' of ,theo To guide the sheetsto the table 240 as they 30 drum; The cam member 204 is yieldingly held pass from between the rolls 220 and-22|, a guide in the Position wherein it is shown in Figs. 5 and member or deecting bar 250 is provided, the 8 by a spring 2|0 disposed around the shaft'205, deflecting bar 250y being secured to the guardthe spring 2|0 being tensionedto hold `the 43am 25 'by bracket members 252 (Fig. 2). The dei member 204 against a`pin2l2 which proiectsfrom fleeting r 25o comprises relatively straight 35 the` side frame 2|. A finger piece 2M formedv portion 253 directly above the rou 22|, 'which integral With the Cam member 204 may be diS- straight portion 253 `terminates in an arcuate placedi'manually in a counter-clockwise direc-' dportion 254, the arcuate portion 254 terminating, tion (Figs. 5 and 3) t0 Withdraw the 9am memin turn, in a relatively long, straight portion ber 204.from the position vwherein it'lies in the ,255, The described portions of the defiecting bar 46 path ofthe bent bar 201. The DUIDOSE 0f this `250 are adapted to curl the paper in a direction y Constructien-Will'prese'ntly appealopposite to that in which "they are curled by A guidingJ or deectins plate 215. secured te the drum 2s. This causes them to lie fiat when the rock shaft 205 is adapted to guide the paper they are discharged to the table 2ML y 14 t0 Stripping rQllS 220 al1d-22| which Will enf To prevent the duplicated l'sheets from being 45 gage the forward end' 0f the pallier and Dull it. Wound around the rol`l22l, either wholly or parfrom the gelatinized surface of the drum. When tially, a, plurality Qfjguid'e rods 251 are prefer the finger Piece 2H 1S displaaedv manually t0 ably provided. One endvof each.of the rods 251 brins the cam memberZM out of the path ef the is flied to the table 24o. The other ends' of tnebent bal' 201, the rock Shaft 205 Will displace the' ',frds. 251 extend into annular grooves 259 formed Asbest shown in Figs. 5, '7, and 10, the stripx guiding or deiiectingvv plate -2| 5 in a' counterclockwise direction (Fig. 5i so'that-any paper, vor

4the equivalent.' adhering to the gelatinized` surface of the drum will\`not be stripped or pulled forward end of the sheet of paper toward the guiding`or defiecting plate 2 |5-and any tendency of the .forward end of the paper to engage the 7 rolls 220 and 22| will simply bring it against th guiding and'deflecting plate 2 |5' which will cause it t6 pass, between the drum 28'and the roll 220 instead'of between the rolls`220'- and 22|.I`

The vrll'220 yfis preferably formed from steel and its cylindrical surface is'preferablyl kriurledv as illustrated in Fig. 1. t'The ends bf the roll 220 are of reduced diameter and are journaledfin' squared bushings 225 which are slidably mounted in brackets 2 26, the brackets 226 being secured to the inner surfaces of lthe vside` frames 2| `and 22. Screws 228 screw threaded through.; lugs 229 provided'on the brackets226lriay bemanipulated to displace the bushings225rwhenv the pressure between the steel roll 220 and the rol1'22l is to be adjusted. :The screws )226 are' l -provided with' lock nuts 230 to secure them in their adjusted positions.

The roll 22| ispreferably formed from rubber, ,KK

or-the equivalent, and is mounted on a. shaft 232 which has its ends rotatably journaled in the brackets 226. The shaft232 is driven by means vcomprising a gear 235 xegfto the shaft. The

gear 235 meshes with-an idler gear 231 which, inturn, meshes with an idler gear 238.

in the rubber roll 22|. Obviously, therods 251I co-operate with'the deflector bar 250 to deliver The idler the duplicated sheets tofthe table 240 in a fiat' 1 condition. ,i

As best shown in Figs. 5 and 9, a pair of spaced bracket members 265 are secured to the shaft 211 by screws 266. Pivoted to thebracket members 265 by screws 268 is a plate -269 from'which a plurality of iingers210 are stamped adjacent. i

one end` thereof. This-end pf/ the plate y269 is identified b the reference character' 21| and it will be no ed that it projects beyond the iingers 210. A spring 214 has one end secured to 'a pin 215 which projects from'the shaft 21, the other end of the spring 214 being secured to a vbar 216 which' is preferably formed integral wih the plate 269` A bar 218, secured to the plate 269 is adapted to engage the shaft 21 when the plate 269 is 'displaced into the position wherein it is shown in'dotted lines in Fig. 5. In other words, the bar 218 forms `a. stop to limit clockwise displacementbfthe plate269 around the screws 268. Counterfclockwise displacementI of the plate 269 around the' vscrews 268 'is limited by the that the spring 21nd is adapted to hold the plate -269 in the position wherein it is'shown infull lines in Fig. 5, and also in the position wherein it is shown in'dotted lines in the same jgure. 1

'Ihe plate 269 lprovides ln ieans for alining a master sheet or stencil (not shown) with the ge -latinized surface of the roll 28 so that a pre-determined margin will be left at the forward ends I Aof the sheets whichv are subsequently Vduplicated from the gelatinized surface. When data 'lor designs are to be transferred to the gelatinized surface from a mastersheet or stencil, thev plate .shovni 26S is snapped into the position-wherein it is in dotted lines in Fig. 5, the drum 28 being preferably rotated into a position wherein the opening 33 of the drum is readily Vaccessible to the operator. When the plate 2.69 occupies the position wherein it is shown in dotted lines in Fig. 5, the drum 28 being preferably rotated into ait. The aniline ink, or the equivalent, employed.

to form the data or design uponthe master sheet is transferred, `in part, -to the gelatinlzed surface.

in the usual'manner. To aid in forming a clear imprint of the design Aor data on the gelatinized surface, the druxn' 2t is -prfeferably rotated a few times so that the platen or impressionroll it presses all portions of the master sheet into rm engagement with the gelatinized surface. When Assuming that the machine is'adjusted .as defthe drum 2t is i rotated for this purpose, the cam 26d and the defiector plate 2 5 are angularly displaced in the manner described above so that the master sheet will not be stripped or pulled from the gelatinizd surface by the rolls 220 and 22| until the operator permits the cam 2M and the deflector plate 215 toreturn to their normal positions."

When the improved machine is producing duplicates, the operation is substantially as follows:

Ascribed above to feed automatically and that a pile of paper l has been placed upon the table 'i3-'fais illustrated in Fig. 2, it will be readily understood that when the drum 28 is-rotated `by the operator through the-drum of the crank t2,

the lever 1B will be oscillated once for eaclrrevo'n lution of the drum. Each time the inner end of the table 'i3 is displaced upwardly, the uppermost sheet of paper 'lli is brought into contact with the feed roll 'H which advances it between the sheet separating platel |20 and the clamping plate |36 to the Imargin-bar U6 asillustrated in Fig. 5. As soon as the forward end of the paper has been brought into engagement with the margin bary H6, the clamping member H36 clamps the paper-between' itsf free edge and the sheet separating plate H20 so that the sheet will be retained in its proper position until the forward end of the gelatin band 40 engages it. The margin bar HS then moves into the position wherein it is shown in dotted lines in Fig. '5; When the forward end of the gelatin band d comes into contact with the paper, the ,clamping member. |36 releases itand permits the gelatin band andz the platen roll H5 to advance the `sheet between them, the forward end of the sheet beingdisposed vbeyond the forward end of the gelatinband. This leaves the necessary margin and also provides a portion which is subsequently de- 22|. As described above, the rolls 220 and 22| pull the sheet from the gelatinized surface and deliver it to. the table v24m. When the operator desires to feed the sheets to'be du licatedinto the-machine, one by-one', it v'is only ne essary to displace the lever- |57' to rock Vlected'by the stripping ngers 38 into a position.

wherein it will be engaged by the rolls 220 and the shaft |54 into\a position wherein the-eccen"` tric |52 holds the lever 18 in the positionl wherein. .it is shown in dotted lines in Fig; 5. The eccentric portion |55 then holds-the clamping plate A|36 spaced vfrom the sheet separating member |20. The operator may then feed the sheets .di-

rectly from the table "i3 tothe margin bar H5. It will be noted that angular displacement of the `lever |57 v'is limited by one end ofthe shaft i9 and by a pin-A |5`la projecting from the side-frame.

2 l. (See Figs. 3 and 8.) Y With respect to the plate 200 which carried the stripping fingers 3B,.it will be noted that it is provided with an integral arm20a which limits:

angular displacement of-4 the plate in acounter- .Y

vf-.clockwise direction (Fig. 5), the arm 200e being provided with a rubber tip 2Mb which is engage- 1 able with the inner surface of the drum 2B and prevents noisy operation of mechanism which actuates the stripping lingers. As set forth above, the pivotal axis of the feed table i3 is adjacent the center of the table and not at the outer end thereof. This construction permits the use of a relatively short frame and also adds tothe speed ofthe machine.

While I have shown-and described certain embodiments of my invention, itis to be understood, that it is capable of manymodifications. Changes, `therefore vin the construction and arrangement may' be made without departing from thesplrlt aridscope of the invention as disclosed in the appended claims in which it is my intention to claim all novelty inherent in my invention as -broadly as possible, in view of the prior art. a 1613111111 l 1, llin a duplicator, a rotatable] drum provided with means to hold one endof a duplicating band, a rotatable member disposed within the drum f and provided with means for holding the other end of said duplicating band, a ratchet fixed to said rotatablemember, a pawl .engageable with said ratchet, and ajleverixed to said rotatable member and disposed within said drum, saidi le ver being adapted' to displace the rotatable member angularly to'draw said duplicating band taut on said drum.

, 2.- I`n a duplicator, a frame, an impression drum rotatably mounted in said frame, a duplicating band carried by said drum, means to feed a sheet of paper to said drum with vone end projecting beyQndsaid band, a member mounted insaid drum and adapted toengage the projectingfend of said paper, a rock shaft mounted in said frame, means carried by said rock shaft to displace said .member whereby it ilexes said projectingend of Athe paperoutwardly, resilient means to hold said member displacing-means in its functionally operative position, and means engageable with the projecting end 'of said paper for pulling said paper from said duplicating band.

3. In a duplicator,`a frame, an impression drum rotatably mounted in' said frame,` a' duplicatingl band carried by said' drum mean's to lfeed a sheet of paper to said 4drum with one end Jp'rojecting beyond said band, af shaft journaled in l said drum, a'stripping member carried bysaidI shaft and* engageable with the projectingnd l 5 of said paper, a bar fixed to said shaft, resilient means for holding said shaft in a position Wherein saidrstripping member is disposed within the periphery of said drum, a rock shaftjournaled in said frame, a cam member carried by said rock shaft and engageable by said bar to angularly displace the first mentioned shaft, resilient means for holding `said cam member in its functionally operative position, and means engageabie with the projecting end of said paper for pulling said paper from said duplicating band.

4. In a duplicator, a frame, an impression drum rotatably mounted in\ said frame, a duplicating band carried by said drum, means to feed a sheet of paper to said drum With one end projecting beyond said band, rolls engageable with saidv projecting Aend of the paper for pulling the paper from said band, a rock shaft pivoted in said drum, amember carried by said` rock shaft for guiding the projecting end of the paper to said rolls, resilient 'means for holding said guiding member ina functionally inoperative position, a lever fixed to said rock shaft whereby it may be displaced to bring said guiding member into its functionally operative position, and means for driving one of said rolls in synchronism with said drum.

5. In a duplicator, a frame, an impression drum rotatably mounted inv said frame, a duplicating band carried by said drum, means to feed a sheet of paper to said drum with one end projecting beyond said band, a member mounted inv said drum and adaptedto engage the projecting end of lsaid paper, a rock shaft mounted in said frame, means carried by said' rock shaft to displace said member whereby ,it flexes'said proj ecting end of the paper outwardly, resilent means to hold said member in its functionally inoperative position, rolls engageable withthe projecting end of said lpaper for pulling said paper 45'. from said duplicating band, means carried by said rock shaft for guiding said paper to said rolls, and means for driving one of said rolls in synchronism with said `drum. v

6. In a duplicator; a frame, an impression drum rotatably mounted in the frame, a margin memvber movably mounted in the drum, a second. margin Jmember movably mounted in the frame, and means operating in synchronism with said drum to displace said second margin member into and out of its functionally operative position.

'7. In a duplicator, a frame, an impression drum rotatably mounted in the frame, a margin member movably mounted in said drum, and resilient means for holding said margin member in o its functionally operative and/inoperative positions. y l

8. In a duplicator, a frame, an impression drum rotatablymounted in said frame, a margin member pivotally mounted in said drum, and resili- 65 ent means for holding said margin member in its functionally operative and inoperative positions. u 9..In a duplicator, a frame, la shaft rotatably journaled in the frame, an impression drum car- 70 ried by said shaft, a bracket member fixed to said shaft, and a margin memberpivoted to said bracket member and movable into and out of its functionally operative position.

10. In a duplicator, a frame, a shaft, rotatably 75 ljournaled in the frame, an impression drum carl l 4 ninto a position wherein its forward edge engages said margin bar, means to clamp said sheet of paper in said position, means co-operating with said gelatinized surface to`advance said sheetV of paper Afrom said position, and means for locking v said clamping means in a functionally inoperative position. X

12. In a duplicator, an impression member provided With a gelatinized surface, a margin bar, a feed roll to advance sheets of paper to said margin bar in" one direct movement, means for driving said feed roll, a movably mounted table .adapted to carry a pile of paper, means actuated in synchronism with said feed roll to displace said table to bring the uppermost sheet of paper thereon` into contact with said feed roll, and means for locking said table-displacing means in a functionally inoperative position whereby said paper may be fed manually to said margin bar. 13. In a duplicator, a frame, an impression drum rotatably mounted in said frame, a duplieating band carried by said drum, a feed roll driven inv synchronism with said drum to feed sheets of paper thereto with the forward ends thereof projecting` beyond said band, a table mpvably mounted in said frame for holding said paper, resilient means for displacing said table to v bring said paper into engagement with said feed roll, means actuated in synchronism with said drum and including a pawl and ratchet for causing said resilient means to beccmefunctionally inoperative, a stripping member movably mounted in said drum and adapted to displace the projecting ends' of said paper, a rock shaft mounted in said frame, said rock shaft being positioned to disengage said pawl from said ratchet when said resilient means displaces said table, means carried by said rock shaft toactuate said stripping member, andmeans engageable with the projecting ends of said paper for pulling said paper from said duplicating band.

14. In a duplicator, a frame, an impression drum rotatably mounted in said frame, a duplicating band ycarried by said drum, a feed roll driven in synhronismwith the forward ends ,thereof `projecting beyond said band, a table movably mounted in said frame for holding said paper, resilient means for displacing said table to bringv said paper into engagement with said feed roll, means actuated in synchronism with said d'rum and including a pawl and ratchet for causing said resilient means to become functionally inoperative, a stripping member movably mounted in said drum and adapted to displace the projecting vends of said paper, a vrock shaft mounted in said frame, said rock shaft beirg positioned toy disengage said pawl from said ratchet when said resilient means,d'isplaces said table,

v means carried by said rock shaft to actuate said stripping member, a pair of rolls for pulling said paper from, said duplicating band, and means xed to said rock shaft for guiding said paper to said rolls.

l5. In a duplicator, -a frame, an .impression drum rotatably mounted in said frame, a duplicating band carried by lsaid drurn,'a feed roll driven in synchronism with said drum to' feed sheets of Vpaper thereto with the forward Vends thereof projecting beyond said band, a table movablymounted in said frame for holding said paper,`resilient means for displacing said table to bring said paper into engagement with said feed roll, meansactuated in synchronism'with said -drum and including a pawl and ratchet for causing said resilient means to become functionally inoperative, a stripping member mvably mounted in said drum and adapted to'displace the projecting ends of said paper, a rock shaft mounted in said frame, said rock shaft being adapted to disengage said pawl from said ratchet, means carried by said`rock shaft to actuate said strip- 'ping member, a pair of rolls for pulling said paper fromsaid duplicating band, meansvfixed to said -rock shaft for guiding said paper to said rolls, andA yielding means for holding said rock shaft in a position wherein said means for actuating said stripping member is disposed in its functionally operative position.

l6.n a duplicator, a frame, an impression drum rotatably mounted inthe frame, a duplieating .band carried by the drum, apair of rolls vfor'stripping duplicated sheets from the duplicating band, and a bent bar' engageable with said paper as it is discharged from said -rolls and Vance -sheets of paper pa'st said sheet separating plate into a position whereinithey will be engaged by said duplicating band, a plate for clamping said sheets of paper in said position, and means for displacing said clamping-plate to release said sheets when they are engaged by the duplicating band and for displacing said plate a greater distance when the sheets of paper are advanced past the 'sheet separating plate. v

18. Inaj duplicator, a frame, an impression drum rotatably journaledin the frame, a duplicating band carried b'y`the frame, a sheet sepa' rating plate -mountedin the frame, means to advance sheets of paper past said `sheet separatf ing `plate into a position wherein they will be engaged by said duplicating band, a plate for clamping said sheets of paper in said position, and

means actuated in synchronism with said drum for displacing said clamping plate to release v said sheets when they are engaged by the duplicating band and for displacing said plate a greater distance when the sheets of paper are advanced past the sheet separating plate.

v19. In a duplicator, a frame] a shaft rotatably journaled in the frame, and an impression drum comprising spaced discs fixed to said shaft, an' arcuate wall extending between said discs, said "arcuate wall being concentric with. the axis of rotation of said shaft and one end of .'said wall being bent inwardly and provided with a plurality of apertures,` means including a plurality of stripping fingers projecting through said apertures, a duplicating band having one end secured `to `said inwardly bent portion of said arcuate wall, meansfcarried by the drum and engaging the other endof said duplicating band'to hold 'it taut on said arcuate wall, and means mounted in said lframe for actuating saidstripping nger f aoraioe A .,means to displace a sheet of paper adhering to said duplicating b and.

20.- In duplicator, a frame, sion drum rotatably mounted in said frame, said impression drum having an arcuate wail cdncentric with its axis of rotation, an apertured flange projecting inwardly from said arcuate Wall, a duplicating band carried on the outer surface of said arcuate wall, a shaft journaled in said drum, a member fixed to said shaft and provided with 'stripping fingers projecting through the apertures ofsaid ange, yielding vrneans urging said shaft in a direction to retract said stripping` fingers, said stripping finger member being engageable vwith the inner surfaceof said arcuate Wall to limit displacement of saidshaft by said yielding means, a bar xed to said shaft, and

means mounted in said frame and' engageable with said bar to displace said shaft against the' action of said spring. l

21. Yin a duplicator, a frame, an impression a hollow impres drum rotatably mounted in the frame and provided with a duplicating surface, a vshaft rotatably journaled in said frame, a platen roll mounted -on said shaft to cooperate with said impression drum, a margin bar pivotedl on said shaft,

and means' actuated in synchronism with said drum for oscillating said margin bar to bring it into and out of its functionally operative position.

22. In a duplicator, a frame, an ixripression.o

member mounted in said frame and provided with a gelatinized surface, a margink bar movably mounted in the'frame, means Yto displace said margin bar into androut-.of its functionally op` erative position, means to feed a sheet of paper into a position wherein its forward edge engages said margin bar, means actuated in synchronism with said margin bar tofrictionally Vengage and hold `said sheet inA said position temporarily, means co-operating with said gelatinized surface to advance said sheet yof paperl from'said position and means for locking said holding means v in a functionally inoperative position when the machine is to be fed by`hanci. l

2 3. In a duplicator, a frame, an impression ,drum rotatably'- journaled in the frame, a vduplicating band carried by the frame, a table for supporting `a pile of paper; means'to advance sheets 'of paper toward said drum from said table, means clamping said sheets of paper when they have been advanced to a predetermined position, and means actuated in synchronisrn with-'\ said drum to release said sheets for engagement withsaid duplicating band.

24. In a duplicator, a frame, a drum rotatably mounted in said frame, said drum having an arcuate wall, said drum being open to the atmosphere between the ends of said arcuate wall, said arcuate wall being provided with numerous small aperturesl therethrough, and a hectograph band mounted on said perforated arcuate wall.

25. In a duplicator, a frame, an impression drum rotatably mounted in said frame, a dupl i catin'g band carried by said drum, means to feed a sheet of paper to said band, means for stripe-fg,A ping said sheet lfrom said duplicating band a als member in the last-mentioned position throught out a plurality of revolutions of said drum.' a

26. In a, duplicator, a frame, an impressionv drum rotatably mounted in said frame, a duplieating band carried by said drum, means to feed a sheetof paper to said band, means for stripping said sheet from said duplicating band, a member carried by saidA drum`an'd movable into two positions relative to said drum, said member, while in\one of said positions, being engageable with the forward edge of said sheet to guide it to said stripping means andf while in vthe other of said positions, being spaced from said forward\edge so that said paper -remains in contact with said band throughout more than one revolution of said drum, and means carried by said drum for holding said' member in the last-mentioned position throughout /a plurality of revolutions of said drum. f

27. in a duplicator, a frame, an impression drum rotatablymounted in said frame, a duplicating band carried' by said drum, means to feed a sheet of paper to said band, means for stripe ping said sheet from said duplicating band, a member carried by said drum and movable into two positions relative to said drum, said member, while in one of said positions, being engageable with the forward edge of said sheet to guidev itI to said stripping means and, while in the other of said positions, being spaced from said forward v edge so that said paper remains in contact with said band throughout more Vthan one revolution.

of said drum, and resilient means for holding said member in the last-mentioned position throughout a plurality of reyolutions of said drum.

28.*In a duplicatorfa frame, an impression' drum rotatably mount in `said frame, a duplicating band carried by said drum, means to feed a sheet of paper to said band, means for stripping said 'sheet from said duplicating band, a`

member carried by said drum` and movable into two positions relative to said drum, said member; while in one of said positions,v being engagea'oleY with the forward edge of said sheet to guide it to sa-id stripping means and, while in the other of said positions, being spaced from said forward edge so that said paper remains in contact with said bandthroughout more than one revolution of said drum, and resilient means` carried by said drum for holding said'member in the last-mentioned position throughout a plurality of revolutions of said drum.- t

29. In a duplicator,- a frame, an impression drum rotatably mounted in said frame, a dupli- Ieating band carried by said drum, means to feed a sheet of paper to said band, means for stripping said sheet from said duplicating band, a guide member carried bylY said frame and movable into two positions relativetosaid drum, said qmember, while in one of said positions,'being engageabl with the forward edge of said'sheet to v guide it to said stripping means and, While in the other ,/of said positions, v being engageable with said forward edge to guide it past said stripping means so thatsaid paper remains in contact with said bandiV throughout more than one revolution of said drum, andmeans for holding said member in the last-mentioned position throughout a plurality of revolutions of said drum.

ALFRED MARCHEV.

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