US2075950A - Duplicating device - Google Patents

Description

April 6, 1937. A. MARCHEV ET AL A 2,075,950

DUPLI'CATING DEVICE Filed April 4, 1935 l; Sheets-Sheet l IMI jz' j.

April 6, 1937.

A. MARCHEVl ET ALv April 6, 1937. A. MARcHEv ET Al. 2,075,950

DUPLICATING DEVICE Filed April 4,l 1955 11 sheets-sheet 3 W WN 0N Ummm Ml; 1 g il wf April e, 1937.

A. M ARcHEv ET AL DUPLICATING DEVICE 11 sheets-sheet 4 Filed April 4, 1955 April 6, 1937.

A. MARCHEV ET AL DUPLICATINC DEVICE 11 sheets-Sheet e Filed April 4, 1935 April 6, 1937.

A. MARCHEV ET Al.

DUPLICATING DEVICE Filed April 4, 1935 A. MAR'cHEv ET AL April 6, 1937.

`DUPLICA'IfING DEVICE Filed April 4, 1955 ll Sheets-Shea?l 8 N EN NSI QN M%\ SSM@ April 6, 1937. MARCHEV ETAL` 1 l2,075,950

DUPLICATING DEVICE Fi1ed April 4, 1955 11 sheets-sheet 9 April 6, 1937. AQMARCHEV ET AL -2,075,950

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Patented Apr. 6, 1937 PATENT oFFlcE 2,075,950 DUPLICATING DEVICE Alfred. Marcnev, La Grange, ana cem c. Mccain,

Glen Ellyn, Ill., assignors to Ditto, Inoorporated, Chicago, lll., a corporation of West Virginia Application Aprila, 193s, serial No. 14,648

`11 claims. (c1. 10i-132) 'Ihis invention relates to duplicating machines and is particularly adapted to be embodied in rotary duplicating machines which arev provided with gelatin bands to'receive impressions from master sheets, which impressionsV are Vimparted subsequently to blank sheets brought into contact with the gelatin surfaces.

'The primary object of the invention is to provide a rotary duplicating machine oi' thecharacter described which is compact, light in weight, eicient in operation and simple in construction, simple to adjust and operate, and having relatively few parts to wear so that'it may be operated over a long period of time without injury to itself or to the paper stock which is fed to it.

The invention resides primarily in a combination of improved means 'for separating and advancing the copy sheets tothe impression drum, aligning the copy sheets with the drum, pressing the copy sheets against the master impression on.

the drum, and removing the printed sheets from the drum.

It is also an object of the invention to so construct each of the mechanisms enumerated above that it will cooperate efiiciently with the other mechanisms to insure continuous satisfactory operation of the machine even in the hands of an f unskilled operator. For example, the improved description progresses, reference being had to the accompanying drawings wherein-` Fig. 1 is a plan view of a rotary duplicating machine which embodies the invention;

Fig. 2 is a side elevation of the machine with a part of one side frame broken away;

Fig. 3 is a side elevation of a portion of the mechanism shown in Fig. 2 illustrating a changed position of the means for holding the automatic sheet feeding mechanism out of operative position;

Fig. 4 is a section taken on the line 4--4 of Fis. 3;

Fig. 5 is a section taken on the line 5-5l of section taken on the line 6 6 a section' taken on the line 9-9 of a portion of the gelatin band Fig. 13 isa section taken on the line I3-l3 of Fig. 12;

Fig. 14 is a section taken on the line I l-Il of Fig. 1;

Fig. 15 is a section taken on the line I E-IS of Fig. 14;

Fig. 16 is a section taken on the line IB-IB of Fig. 6;

Fig. 17 is a section taken on the same line as Fig. 16 showing a changed position of the mechanism;

Fig. 18 is a section taken on the line l8|8 of Fig. 1;

Fig. 19 is an enlarged fragmentary plan view of a portion of the copy sheet aligning mechanism on the feed table;

Fig. 20 is a'plan view like Fig. 19 showing a changed position of the mechanism;

Fig. 21 is a. section taken on the line 2I-2I of Fig. 19;

Fig. 22 is a section taken on the line 22-22 of Fig. 19;

Fig. 23 is a perspective view of the guide plate forguiding .the copy sheets to the impression drum; v i v Fig. 24 is a fragmentary perspective view of 'one end ofthe guide plate shown in Fig. 23 with a cooperating trip lever;

Fig. 25 is a fragmentary sectional view taken v on the line 25`25 of Fig. 5;

Fig. 26 is a fragmentary sectional view taken i trated, the reference character 30 represents gen- `erai1y a frame which comprises side 'frame J members 3| and 32, these members being secured to each other in spaced relation by tie rods 33, 33a, 34 and 35. It will be noted that the side frames have their peripheral edges flanged inwardly as indicated in Figs. 2 and 5, at 36 and 31, and at the bottom the flanges 36 and 31 have ears such as 38 and 39 to which are secured feet such as 48 for supporting the machine. The tie rods 33 and 34 also support a shelf member 4| which rests upon sleeves 42 and 43 provided at the opposite ends of the tie rods 33 and 34 and is held down tightly in place by suitable ears, 45 punched out of the side frames 3| and 32. This shelf member 4|, which serves also as a reenforcing plate to give added rigidity to the machine, is turned up at the forward end of the machine as shown at 46 in Fig. 2. At the rear end of the machine, the member 4| follows the contour of the anges 36 and 31 on the side frames 3| and 32 upwardly past the tie rod 35. Directly over the tie rod 35, the edge of the member 4| is provided with an inwardly extending ange 41 (see Figs. 1 and 5).

Rotatably Journalled in theside frames 3| and 32 is a shaft 48 which carries an imprespression drum comprises spaced disks 5| and 52 which are secured by means of hubs 5|a` and 52a to shaft 48. These disks have inwardly extending peripheral anges\53 and 54 in which an arcuate impression member 55 is secured. It will be noted from an inspection of Fig. 5 that, at the periphery of the disks 5| and 52, recesses 56 and 51 are provided by anging the disks outwardly and bending them back to provide the anges 53 and 54. The ends of the arcuate impression member 55 are seated in the recesses 56 and 51. The member 55 does not extendv all the way around the disk. 'Ihis leaves an opening between the ends thereof, and these ends have inwardly directed flanges 53 and 59 shown` best in Fig. 10, the flange 59 being provided with suitable apertures 68 for the passage of fingers 6| of a guide member 62 which guides copy sheets 93 to the stripping mechanism.

This guide member 62 is carried on a shaft 63, the opposite ends of which are journalled in the disks 5| and 52, and is normally retracted by springs 64 (see Fig. 10) which are connected to suitable ears 65 punched out of the disks. From an inspection of Fig. l0, it will be noted that two of such ears 65 are provided in each disk 5| and 52 although only one is used. The reason for this is that the disks are punched identically and so. therefore, may be used at either the right hand or left hand end of the impression drum.

"qhe arcuate member 55 has the usual gelatin coated fabric band 66 stretched around its periphery, this band being provided with clips 61 and 68 at its opposite ends. 'Ihe clip 61 is hooked over the inturned flange 59 of the arcuate member 55. The end of the band 66 to which the clip 61 is attached has suitable apertures as indicated at 61a (see Figs. 10, 12, and 13) for the passage of the stripping fingers 6|. 'I'he clip 68 is hooked over the free edge of a flange 69 provided on a shaft 1li which extendsfrom disk 5| to disk 52 and which is rotatably journalled in the disks for tightening the band. The band 66 vis held taut by a pawl and ratchet mechanism shown most clearly in Fiss. 5 and 10.

This mechanism consists of a ratchet wheel 1| xed on the shaft 19 and a pawl 12 pivoted by means of a screw 13 on the disk 52. Spring 14 holds the pawl 12 in engagement with the ratchet wheel 1|, but the pawl may be released by pressure on a finger piece 15 when it is desired to remove the band from the drum. At the opposite end of the shaft 19 fromthe ratchet wheel 1|, there is aiixed to the shaft a nger piece 16, by means of which the shaft may be rotated the necessary amount to draw the band taut on the impression member 55. The impression member 55 may desirably be provided with openings 11 to prevent air pockets beneath the band 66.

f The hubs 5|a and 52a in addition to carrying the disks 5| and 52, also carry a driving gear 18 shown in section in Fig. 5 at the left hand end of the impression drum as riveted to the hub by the same rivets which hold the end disk 52. A cam 19 is also xed to the hub 52a by these rivets. Hub 5|a has riveted thereto a cam 30. Cams 19 and 83 fixed to the impression drum in this mannergserve to operate certain other parts of the machine which will be more fully described hereinafter.

Referrin-g again to gear 13 (Fig. 10), this gear is made up of two sheet metal blanks whereby to provide a light strong gear at a very low cost, the two blanksl being cut and then pressed together and held in position by the rivets which secure them to the hub. The main driving gear 18 drives a feeding roller 8| which cooperates to strip them from the impression drum. The

ate gear 84 which is mounted on a stub shaft l with a platen roller 82 and a stripping roller 83 to feed copy sheets to the impression drum and mounted in the side frame 32 and meshing with The roller 8| is journalled at itsv opposite ends in suitable bearings provided at 36'and 81 (Figs. 10 and 15) This roller has spaced knurled portions 83 separated by reduced portions 39 with which guide fingers on a paper guide 9| coinvcide. The knurled portions 88 are adapted to engage copy sheets 93 fed between the roller 3| and the platen roller 82 and stripping roller 33 respectively to thus feed the sheets to the drum in co-operation with the platen roller 82 and strip them from the drum in co-operation with the stripping roller 83. The fingers of the paper guide 9| are adapted to be depressed into the reduced portions 89 .of the roller 8| in a manner which will be hereinafter more clearly explained.

Platen roller 32 is preferably composed of rubber and iscarried upon a shaft 94. This shaft at its opposite ends'is journalled in bearings 95 and 96 (see Figs. 6 to 10) which bearings are so mounted in the side frames 3| and 32 as to permit movement thereof toward and away fromthe impression drum. The mountings of the bearings and 96 are illustrated in detail in Figs. '1, 8 and 9, and comprise guides 91 struck up from the side frames and turned in toward each other to provide guiding lflanges riding in cooperating slots provided in the bearings 95. The bearings are yieldingly pressed toward the impression drum and the feed roller 8| by plungers 98 of which there is one at each end of the shaft 94. Each of the plungers 9.8-has a rounded head end 99 seating iii a corresponding recess, in the top of the bearing 95. A spring l0l is interposed between the top of the head 99 and the flange of the side frame. 'Ihe upper end of the plunger sticks through an opening provided in the flange of -the side frame and has a pin l02 therein to prevent the plunger from being forced down too far by the spring |0l.

'Ihe stripping roller 83 is carried on a shaft |08 which is journalled in bearings |04 and |05 (see Fig. 6) mounted on the side frames 8| and 82 in the same fashion as bearings 95 and 96 are mounted. Plungers 98a, similar in every respect to plungers 98, engage bearings llll-and to press them upwardly to press the stripping roller 83 against the roller 8l. Springs |08 press the plungers 98a upwardly, and these springs bear against ears |01 struck up from the side frames 3l and 32, which ears are provided with openings through which the plungers 98a extend. these plungers being also provided with suitable pins |02a to prevent their becoming detached from the ears |01.

The paper guide 9| cooperates with the platen l At its opposite ends, this sheet metal strip las bearing portions |09 and l09a curved around the rod |08 to. pivotally mount the paper guide. The lower portion of the paper guide has ears l|0 and lllla projecting beyond the upper portion of the guides'at the opposite ends, and these `projecting ears l|0 and |l0a are connected-by means of springs I|| and Illa to lugs ll2 and ll2a (see Figs. 6, 10, and 11), the springs Ill and llltir being under tension so as'to normally hold the paper guide in the position shown in Fig. 10, that is to say in a position to hold the ngers 90 thereof above the level of the knurled portions'88 ofthefeed roller 8|.

'I'he paper guide 9| also comprises an upperl guide plate l|3 which extends upwardly and rearwardly at an acute angle to the portion of the paper guide having the fingers 90 thereon.

The upper guide plate ll3 has its rearmost portion l|3a bent upwardly slightly more than the main body portion thereof. This upper guide plate is secured at its opposite ends by means of rivets to two strips lll and I lla which are formed on levers |l'l and ll1a. Levers ll'| andv lila. are fixed on a rock shaft ll8 which is journailed in the side frames 3| and 32. 'I'he levers ll1 and ll1a operate to press down the paper guide 9| by means of their fingers ||6 and IlGa.

Lever l|1a has an upwardly extending portion ||1b which carries a roller |20 riding on cam 80 which, as hereinbefore described. is xed to the drum 49 so as to rotate therewith. A spring l2l connecting an ear |22 on the lever arm llla with a lug |28 (see Figs. 15 to 17) on the side frame 3l holds the roller |20 in contact with the cam 80. As shown best in Figs. 2, 16, and .17, cam l|30 has one portion 80a of a larger radius than the remaining portion thereof. When the roller`-|20 is riding on the portion 80a, it holds the lever arm ll'la in the position show-n in Fig. 16, and lever ll'la through the medium-of the shaft -l'l8 also holds the lever ||1 in the position shown in Fig. 14 so that the fingers 90 of the paper guide 9| are elevated by means ofthe springs lll and Illa so as to bear tightly against the platen roller 82 (see Fig. 10).

When the roller |20 moves off the portion 80a of the cam 80, then the spring |2| moves the lever ll'la to bring the roller against the smaller portion of the cam 80 in the position shown in Fig. 17. This brings the fingers l|8 and ||6a on the levers Il'l and l|1a down against the projections IIS and ll5a on the paper guide to move the paper guide fingers A90 into the position shown in Fig. 11, so as to permit the platen roller 82 to engage the knurled portions 88 of the feed roller 8|. Continued rotation of the drum, after the knurled portions 89 and the platen roller 82 engage a copy sheet 88 therebetween, causes thev feeding of the copy sheet into the gap of the drum. Cam I8|l is so located with respect to the position of the gelatin band on the drum as tb bring the feed roller 8| and platen roller 82 into copy sheet feeding -positionwith the paper guide 9| depressed slightly before the advancing end of the duplicating band arrives opposite the nsers 90 so that the copy sheet is fed to the duplicating band with its forward edge projecting,

slightly beyond the advancing end of the band. When roller 82 is in the position shown in Fig. 17 it is actually'a feed roller.

As the advancing-edge of the gelatin band contacts the paper, which -has been fed into the gap of the drum during the period'of time that roller 82 contacts roller 8|, roller -82 is forced up,

wardiy away from roller 8l at an anglefcorresponding to its 'journal guides. When this occurs, see Fig. 11, roller 82 becomes a platen roller as the pressure between it and the gelatin band is still maintained for printing purposes.` The reason for this is the fact that the peripheral speedof the roller 8| is about three per cent (3%) greater than that of the drum, a -condition that must exist for proper stripping. It is evident that it would be impractical. for the roller 82 to contact roller 8| and thedrum at the saine time under these conditions.

The means for stripping the copy sheets .from l the duplicating band comprises Ain part the stripping fingers 6l hereinbeforedescrihed as mounted within the drum and the co-operating memward edge of the copy sheet out as indicated in Fig. 10. Fingers 6l are moved out into the posiv tion shown in Fig. 1 0 upon 'each revolution of vthe drum ina manner'which wiilnow be described. v

70 Shaft has one end projecting vthrough the end disk 8| of the drum (Figs. 2, 26 and 27). The

is riveted to the side frame 8| as shown most clearly in Fig. 15. As indicated clearly by the `two positions in Figs. 26 and 2'1, the engagement of the arm 83a with the cam surface |24 moves 5 the stripping ngers 8| out against the projecting end of the copy sheet to force it outwardly toward the junction of the stripping roller 83 and ,feed roller 8|.

The stripping mechanism also comprises a l0 guard plate |28 shown most clearly in Figs. 6, 10 and 11. This guard plate |28 is bolted to lugs |21 and |21a which are punched out from the side frames of the machine and is directed upwardly toward the stripping roller 83 so as to l5 prevent the copy sheets from falling below the stripping roller. It is evident that stripping roller 83 is driven by the knurled portions of the feed roller 8| when there is no sheet between these two rollers. The stripping mechanism also comprises a lower portion 9|a ofthe paper guide 9| as illustrated most clearly in Fig. 11 where this lower portion operates to' deect the copy sheet downwardly over a spring guide |28 to a receiving tray 29. The spring guide |28, as illustrated best in Figs. 10 and 11, has one end curved around the tie rod 33a. It is then extended forwardly and curved around the shaft ||8 and thence rearwardly in the shape illustrated. 'I'here may be as many of the spring 30 guides |28 as is found necessary to properly direct the copy sheets into the tray |28. A freely pivoted rod |30, which is pivoted on the lower surface of a feed table |3|, is merely for the purpose of holding the copy sheets down in position in the receiving tray. The receiving tray |29 may be of any suitable construction. The tray shown here consists of a sheet metal plate having its rim bent up to provide the sides of the tray, and the side edges are-extended beyond the bottom of the tray at the front as indicated at |32 in Fig. 10. Slots arel provided in the extended side edges which slots fit .down over the tie rod 33a.

Feed table |3| comprises a sheet metal plate having a peripheral flange |33 which extends along three sides of the tray, but is cut away at the edge of the tray next to the machine as shown in Figs. 10 and 11. Side flanges |33a and |33b of the tray are notched as indicated at |34 to llt down over the tie rod |08, this tie rod being reduced in diameter as indicated at |35 and |38 to receive .the notches in the side edges of the feed tray and 'properly position it with respect to the machine. Tray |3| is connected to the receiving tray |29 bysuitable braces |38 shown in Figs. 1 and 2 so as to hold the feed tray in operative position. The only connection of the feed trayv |3| and the receiving tray |29 -with the main part of the machine is by means of the slots or notches at |32 on the receiving tray and at |34 on the feed tray,v hooking over the tie rods 33a and |08. These two trays can readily be removed by lifting them oiT the tie rods, and they may 6,- then be stored within the machine as shown in dotted lines in Fig. 2 with the tray resting upon the member'4l.

The feed tray |3| further comprises meansfor properly aligning and positioning the copy sheets to be ied to the machine thereon. For this purpose, the feed tray is provided along the opposite sides thereof with a pair of longitudinally extending guide rails |31 and |38. Each guide rail comprises a strip of metal running lengthacuoso |40 resting on top of the tray with a central upstanding portion 4| formed by folding the strip. 'I'his structure is shown most clearly in Figs'. 1 and 18 t22 inclusive. The tray is slotted transversely as indicated by slots |42, |43, |44, and I |45, and suitable guide pins |48 are secured to the portions |40 'of the guide rails |31 and |38 and project downwardly through the slots |42 to |45. Beneath the tray |3|, these pins |48 are each provided with a suitable washer |41, a spring |48, a securing cupped washer |49 and a cotter pin |50 so that the guide rails 31 and |38 are adjustably held in position on the tray 3|. This provides a simple and convenient manner of mounting the guide rails for adjustment toward and away from each other for different widths of sheets.

The guide rails |31 and 38 further carry metallic strips |5| and |52 on top of the portions |39 thereof, these strips being secured by spot welding or some other suitable means. 'I'he purpose of the strips |5| and |52 isto buckle the copy sheets upwardly at the center to facilitate separation thereof.

In line with the strips |5| and |52, the tray has in the center thereof a rubber insert |53 providing a raised surface for the copy sheets to rest upon, which raised surface produces sumoient friction to prevent an entire bundle of copy sheets from sliding on the top of the tray when a top sheet is fed therefrom. This central insert |53 is secured by means of sheet metal trough |54 having portions ofits side walls, as indicated in dotted lines at |55, punched in to grip the rubber and having side anges |58 and |51 welded or riveted to the lower surface of the tray |3|.

Means are also provided on the guide rails |31 and |38 for exerting side pressure on a bundle of copy sheets placed on a table for aligning it, which means may thereafter be released to leave the copy sheets free for feeding. These means comprise adjustable sponge rubber pieces |58 and |58 carried by the side rails |31 and |38 respectively. The mountings for the pieces |58 and |59 are identical except that one is on the right hand side of the feed tray and the' other is on the left hand. side, so the description of one mounting will sumce for both.

As illustrated best in Figs. 18 to 21, the mounting for the piece` |58 comprises a slidable plate |80 having an upstanding flange |8|. The plate |80 has at its opposite ends pins |82 and |83 which pins slide in slots |84 and |85 provided in plates |88 and |81. 'I/he plates |88 and |81 are secured to the top of the portion |40 of the guide rail and are bent upwardly as indicated at |88 and |89 for the reception of the plate |80.

It is evident that, as the plate |80 is moved from the position shown in Fig. 19 to the position shown in Fig. 20, the sponge rubber piece |58 carried therebywill be backed away from the copy sheets overlying the members |5| and |52. The sponge rubber piece |58 is secured in position by a Z-shaped plate |10 which also has end portions |1| and |12 engaging the ends of the piece |58. The bottom of the sponge rubber piece |58 rests upon a raised portion |13 of the plate |80. Vertically extending strips |14 and |15, extending inwardly from the flange |8| and engaging the back of the member |10, hold the member |10 in fixed position, with a lower horizontal portion |18 thereof seated in the trough provided by the flange |8| and the raised portion 13 of the plate |80. n

suitable bearings |82 and |83 (see Fig. 5) mounted in the side frames 3| and 32. Shaft |8| carries a second lever |84 like lever |19 except that it carries no roller. The roller |80 is held against the surface of the cam |19 by means of a spring |85 connected to an ear |88 on the lever |19 and to a pin |81 on the side frame 32.

-Pivoted to the upper ends of the levers |19 and |84 is a U-shaped .member |88. The side frames 3| and 32 carry suitable flanged rollers |89 and |90 for guiding the legs of the U-shaped member |88 as they are moved by the cam 19 engaging the roller |80 on the lever |19. The member |88 is composed of two side. pieces |88a and |8817, which are pivoted to the levers |19 and |84 respectively, and a cross bar |9I. l

This cross bar has two brackets |92 and |93 riveted thereon as shown in Fig. 1, and one of the'se brackets has a top plate |94 integral' there- A with running across to the other bracket-and resting on the top thereof. A feed roller carrying frame |95 has arms |98 and |91 pivoted to the free ends of the brackets A92 and |93 respectively. The arms |98 and |91 have inturned lugs |98 and |99 engaging the lower edges of the brackets |92 and |93 when the frame |95 is in the position shown in Figs. 1 and 11. Bracket |93 also carries a lug 200 (see Fig. 11) to which a spring is secured, the other end of the spring being secured in a lug 202 turned up from the arm 91. The spring is so positioned with respect to the pivotal connection of arms |98 and |91 to the brackets |92 and |93 as to yieldingly hold the frame |95 in either the full line position shown in Fig. 10 or the folded position shown in dotted lines in Fig. l0 since the spring is stretched by swinging the frame |95 between these two hunting positions.

The frame |95 has pivoted thereto a sheet feeding roller 203. This roller may be of rubber o r other material suitable for feeding the copy sheets, a shaft 204 of the roller being journalled in slots 205:1 and 208a in arms 205 and 208 which are pivoted to depending ears 201 and 208 (see Figs. 10, 11, and 14) of the frame |95. The

` mounting of the roller is preferably such that it will roll when the cam 19 moves from the full line position shown in Fig. 14 to the dotted line position shown in Fig. 14 to thus cause the member |88 and the frame |95 carried thereby 'to move away from the duplicating drum toward the dotted line position shown for the frame |95 in Fig. 14. When the frame |95 is moved in the opposite direction, that is toward the full line position shown in Fig. 14, the feed roller 203 is prevented from turning to thus cause it to feed a sheet from the feed table 13| toward the duplicating drum. The action just described is accomplished by a bar 209 which is fastened to a plate 2|0 and projects down against the roller 203 when the roller is in the position shown in Fig. 11. The slots 205e and 208:1 in the arms 205 and 208 for mounting the shaft of the roller 203 permit the roller to move when the frame |95 is travelling to thev left so as to clear the bar 2.09.

Now, however, when the frame |95trave1s to the right, the shaft 204 of the roller 203 slides in the slots in the arm 205 and 208 to engage the rubber roller with the bar 209 and preventsv rotation of the roller. An extension 2|| of the plate 2|0 merely serves to limit the movement of the roller 203 away from the frame |95 by engaging the frame.

It is sometimes desirable to feed the copy sheets to the machine by hand in which case thejframe |95 can be folded up into the dotted line position shown in` Fig. 10. In this event, it is undesirable to have the cam 19 operating the arms |19 and |84 so as to be continually advancing and retracting the sheet feeding mechanism. Means are, therefore, provided whereby arms |19 and |84 may be moved back sufciently to prevent cam 19 from engaging roller |80. This means is shown best in Figs. 2, 3, and 4 and comprises a pair of plates 2|2 and 2|3 secured to the side frame member 3| by means of a pin 2 |4, the outer plate 2|2 carrying a finger piece 2|5. The frame 3| is slotted with an arcuate slot 2|8 concentric with the pin 2|4, and a pin 2|1 is secured by means of a reduced extension 2|8 to the plates 2|2 and 2|3, this pin being extended inwardly suillcient to extend into the path of the arm |84. A spring 2|9 is connected to 'the pin 2|1 and, at its other end, is mounted on a pin 220 secured to the frame 3|, the pin 220 being directly below the pin 2|4.

When the operator desires to eliminate the automatic feeding and to stop the motion of the arms |19 and |84, he merely swings the plates 2 |2 the path of the cam 19.

The general operation of the machine will now 5 be described.

The operator places a gelatin band 88 on the impression drum 49 by hooking the clip 81 over the inturned flange 59, turning the drum clockwise to lay the band thereon then hooking clip 88 over flange 89 on shaft 10 and turning shaft 10 by means of nger piece 18 to draw the band taut on the drum. Ratchet wheel 1| and pawl 12 hold the shaft 10 in position to keep the band taut.

A master sheet is next laid on the band 8.8. This master sheet may be fed from table |3| by hand tothe guide member 9|. The drum is rotated to bring the gelatin band up to position to receive the master sheet. As the drum handle is rotated in a clockwise direction, the portion 80a of cam 80 moves out from under roller |20 (Fig. 16) and spring |2| draws the arms ||1 and ||1a to the right to move the fingers ||8 and ||8a down against the projections ||5 and 5a on the paper guide 9| to press the paper guide down. The knurled portions 88 of feed roller 8| are thus engaged with the master sheet and advance the master sheet to the drum as the rotation of the drum continues.

The master sheet is left on the gelatin as long as necessary by stopping the drum before it has been rotated sufficiently to bring the advancing end of the master sheet to the stripping roller 83.

Now the operator may place a bundle of copy sheets upon the feed table |3| and by pushing the guide rails |31 and |38 towards each other position lthe bundle accurately. The bundle is now bowed up between its ends by rubber friction pad |53 and the strips |5| and |52 and is ready for feeding. Sheets may be fed by hand from the top of the bundle into engagement with the margin stop provided by paper guide 9| and the platen roller.

When automatic feeding is desired the sponge rubber sheet separating pads |58 and |59 may 10 be engaged with the sides of the bundle by sliding the plates |50 operated by cam slots |84 and pins |52 towards the bundle. These pads |58 and |89 pressing against the sheet edges in .the bundle tend to hold them in place as th'e top sheet is being pulled oif. When the pads are positioned the operator lowers feed roller carrying frame |95 down to the dotted line position shown in Fig. 10 to bring the roller 203 into engagement with .the top sheet of the bundle. Further operation of 2O the machine will cause the sheets to be automatically fed to the drum.

To start the automatic feed, the operator must move the plates 2|2 and 2|3 into the position shown in Fig. "2 so as to move pin 2|`| away from 25 lever |84. The spring |85 wil then swing levers |19 and |84 toward the drum axis so that roller |80 rides on the cam 19 as the drum rotates and causes a rocking movement of levers |19 and |84. This rocking movement causes reciproca- 30 tion of the U-shaped member |88 which in turn reciprocates the frame |95 in synchronism with rotation of the drum 49.

Upon movement of the frame |95 away from the drum, the roller 203 may slide in its bearings '35 so as to move away from the bar 209 and so it rolls over the copy sheets. Upon the return movement of the frame toward the drum the roller slides in its bearings until it engages the bar 209 and then during the remainder of the 40 movement: of frame |95 toward the drum, the

roller 203 is prevented from rotating by bar 209 and therefore by its frictional engagement with the top sheet of the bundle of copy sheets advances the top sheet to the margin stop provided 45 by paper guide 9| and platen roller 82.

As shown most clearly in Fig. 10, the position of cam 'I9 with -respect to the gelatin band 86 on the drum is such that when the cam '|9 has moved the frame |95 to the limit of its move- 50 ment toward the drum, the advancing end of the gelatin band is still somewhat below the paper guide 9|. Further rotation of the drum moves portion 80a of cam 80 past the roller -|20 on lever Illa to allow the spring |2| to move levers 55 and ||`|a clockwise from the position shown in Fig. 16 to the positionrshown in Fig. 17. The fingers 90 on guide 9| are moved down by this operation to permit feed roller 8| Aand platen roller 82 to advance the copy sheet to the drum so 60 that the forward edge of the copy sheet projects beyond the advancing end of the gelatin band. i

Rotation of the drum carries the copy sheet around until its forward end is approaching the 65 stripping roller. l

27, arm 83a on shaft 53 engages the cam surface |24 of bracket |25 and moves the stripping lingers 8| out against the projecting end of the copy sheet and directs the sheet toward the stripping 70 roller 88. Stripping roller 83 is driven by the knurled portions 88 of roller 8| and when the copy sheet reaches the junction of the rollers 88 and 8|, it is fed by them out beneath portion 9Ia of r paper guide 8| and over the guide |28 into the 85 receiving trayV |28.

As shown best in Figs. 26 and u copy sheets.

While certain embodiments of the invention have been shown and described it will be understood that it is capable of many modifications. Changes, therefore, in the constructionand arrangement may be made-without departing from 5 the spirit and scope of the invention as disclosed in the appended claims in which it is the intention to claim all noveltyv inherent in the invention as broadly as permissible in view of the prior art. l0

Having thus described the invention what we claim as new and desire to secure by Letters Patent is:

1. In a duplicating machine, an impression drum, means for rotating said drum, a platen 15 roller, a feed roller cooperating with said platen roller to advance copy sheets to the drum, and means interposed between the feed roller and the platen roller cooperating with the platen roher to provide a margin stop for copy sheets.

2. In a duplicating machine, an impression drum, means for rotating said drum, a platen roller, a feed roller cooperating with said platen roller to advance copy sheets to the drum, and means interposed between the feed roller and the platen roller cooperating with the platen roller to provide a margin stop for copy sheets, said means comprising a paper guide having a guide slot for the copy sheets through which the sheets are directed to said rollers and having flngers extending between the feed roller and platen roller.

3. In a duplicating machine, an impression drum, means for rotating said drum, a platen roller, a feed roller cooperating with said platen roller to advance copy sheets to the drum, and means interposed between the feed roller and the platen roller cooperating with the platen roller to provide a margin stop for copy sheets, said means comprising a paper guide having a guide slot for the copy sheets through which the' 40 sheets are directed to said rollers and having ngers extending between the feed roller and platen roller, said guide being movable by rotation of said drum to control passage of copy sheets between said rollers.

4. In a duplicating machine, an impression drum, means for rotating said drum, a platen roller, a feed roller cooperating with said platen roller to advance copy sheets to the drum, means interposed between the feed roller and the platen roller cooperating with the platen roller to provide a margin stop for copy sheets'and to hold the copy sheets away from the feed roller and means-actuated by rotation of said drum to withdraw the margin stop and render the feed roller operative to feed copy sheets -to the drum.

y5. In a duplicating machine, a duplicating drum, a platen roller for pressing copy sheets against said drum, a stripping roller for stripping sheets from said drum, anda third roller cooperating with said first named rollers to feed a fresh copy sheet to said drum and to strip the copysheet from the drum after it has passed around the drum.

8. In a duplicating machine, a duplicating v drum, a platen roller for pressing copy sheets against said drum, a stripping roller for stripping sheets from said drum, and a third roller cooperating with said first named rollers to feed a fresh copy sheet to said drum and to strip the copy sheet from the drum after it has passed around the drum and means interposed between said third roller and the platen roller cooperating with the platen roher to provide a margin stop for '7. In a duplicating machine, a duplicating drum, a platen roller for pressing copy sheets against said drum, a stripping roller'for stripping sheets from said drum, and a third roller cooperating with said first named rollers to feed a fresh copy sheet to said drum and to strip the copy sheet from the drum after it has passed around the drum, and a copy sheet guide means on said drum for directing the forward edgegof the copy sheet to said stripping roller.

8. In a duplicating machine, a duplicating drum, a platen roller for pressing copy sheets against said drum, a stripping roller for stripping sheets from said drum, and a third roller cooperating with said first named rollers to feed a fresh copy sheet to said drum and to strip the copy sheet from the drum after it has passed around the drum, a copy sheet guide means on said drum for directing the forward edge of thev copy sheet to said stripping roller and means interposed between said third roller and the platen roller cooperating with the platen roller to provide a margin stop for copy sheets.

9. In a duplicating machine, a frame, a duplicating drum rotatably journalled therein and having a duplicating band on the periphery thereof, a copy sheet feed table, a platen roller, a copy sheet guide cooperating with said platen roller to provide a margin stop for the copy sheets,

means to release said margin stop to permit advance of the sheet to the drum, and stripping means for stripping the copy sheet from the drum, said stripping means including a roller which also cooperates with said platen roller to advance copy sheets to the drum. A

10. In a duplicating machine, a frame, a duplicating drum rotatably journalled therein and having a duplicating band thereon, a copy sheet feeding means, a platen roller, a guide plate having fingers cooperating with said platen roller to provide a margin stop for the fed copy sheets, and means driven from said drumv for withdrawing said n'gers to permit advance of the copy sheet to the drum, said platen roller being mounted for movement away from the drum and away from said fingers, and spring means urging the platen roller toward said drum and toward said fingers.

11. In a duplicating machine, a copy sheet tableA and means thereon toposition a bundle of copy sheets on said table, said means comprising guide rails on said table movable toward and away from each other and yielding bundle engaging pads movably mounted on said guide rails and means for adjusting said pads toward and away from the bundle of copy sheets between said guide rails while the guide rails are stationary.

12. In a duplicating machine, a copy sheet table and meansthereon to position a bundle of copy sheets on said table, said means comprising guide rails on said table movable toward and away from each other and yielding bundle engaging pads movably mounted on said guide rails and means for adjusting said pads toward and away from the bundle of copy sheets between said guide rails while the guide rails are stationary', said table having a friction pad thereon projecting up from the surface thereof.

13. In a duplicating machine, a. frame, a duplicating drum and copy sheet feeding and stripping l means for said drum comprising a feed roller driven from said drum and platen and stripping rollers driven by said feed roller.

14. In a duplicating machine, a frame, a duplicating drum rotatably journalled therein and having a duplicating band thereon, a platen roller 'adapted' to press copy sheets against said duplicating band, means providing a margin stop for copy sheets alongside said platen roller, means including a driven feed roller adapted to press ,copy sheets against said platen roller and cooperate with said platen roller to advance the sheets to the drum, said platen roller being mounted for movement away from said drum and away from said feed roller, and means operating in synchronism with said drum for moving said" 'from said feed roller, and means operating in synchronism with said drum for moving said platen roller away from said driven feed roller, said last named means comprising cam means rotating with the drum, and means fixed to said margin stop means and actuated by said cam to.

lift said platen roller.

16. In a duplicating machine, a frame, a duplicating drum rotatably journalled therein and having a duplicating band thereon, a platen roller adapted to press copy sheets against said duplicating band, means providing a margin stop for copy sheets alongside said platen roller, means including a driven feed roller adapted to press copy sheets against said platen roller and cooperate with said platen roller to advance the sheets to the drum, said platen roller being mounted for movement away from said drum and away from said feed roller, said margin stop means being movable with the platen roller, and means operating in synchronism with said drum for moving said platen roller away from said driven feed roller.

17. In a duplicating machine, an impressionV drum, means for rotating said drum, a platen roller, a feed roller cooperating with said platen roller to advance copy sheets to the drum, and means interposed between the feed roller and the platen roller cooperating with the platen roller to provide a margin stop for copy sheets, said platen roller and said margin stop means being movably mounted, and means operating in synchronism with the rotation of the drum for holding the margin stop means and platen roller in position to prevent copy sheets received thereby from contacting said feed roller during a portion of the rotation of the drum.

ALFRED MARCHEV.

CECIL C. McCAIN.

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