US2622518A

US2622518A - Sheet feeding means for duplicating machines

Info

Publication number: US2622518A
Application number: US573412A
Authority: US
Inventors: Eric W Peterson; George J Rundblad
Original assignee: Ditto Inc
Current assignee: Ditto Inc
Priority date: 1945-01-18
Filing date: 1945-01-18
Publication date: 1952-12-23
Anticipated expiration: 1969-12-23

Description

Dec. 23, 1952 E. w. PETERSON ET AL 2,622,518

SHEET FEEDING MEANS FOR DUPLICATING MACHINES 5 Sheets-Sheet l Filed Jan. 18, 1945 mm mmm m2 X2 www.

OWN.

A- w f 11111111 ,L 11.1..

Dec. 23, 1952 E. w. PETERSON ET AL 2,622,518

SHEET EEEDING MEANS FOR DUPLICATING MACHINES 5 Sheets-Sheet 2 Filed Jan. 18, 1945 INVENTORS: Eric (M Petenson. BY @607:96 nundflaa gala, .Qa/Liam, Mfmgf Dec. 23, 1952 E. w. PETERSON Erm. 2,622,518

SHEET FEEDING MEANS FOR DUPLICATINQ MACHINES 5 Sheets-Sheet 5 Filed Jan. 18, 1945 gaz/g zsh/Jem, MM

Dec. 23, 1952 I E. w. PETERSON ET AL 2,622,518

SHEET FEEDING MEANS FOR DUPLICATING MACHINES Filed Jan. 18, 1945 5 Sheets-Sheet 4 INVENTORS Dec. 23, 1952 E. W. PETERSON ET AL SHEET FEEDING MEANS FOR DUPLICATING MACHINES 5 Sheets-Sheet 5 Filed Jan. 18. 1945 Patented Dec. 23, 1952 SHEET ragni-No MEANS FOR DUPLICATING MACHINES Eric Peterson, Glen Ellyn,v and George J. Rundblad, Elmwood Park, Ill., assignors tc Ditto, Incorporated., Chicago, Ill., a corporation of VJcst Virginia implicationJanuary 18, 1945, Serial No. 573,412

(Cl. lOl-1325),

6 Claims, 1

The present invention relates to dnplicating` apparatus and it is particularly directed to the copy sheet feeding mechanism by whichsheets are supplied` to the drum uponwhich the master sheet is located in timed relation to the rotation of'vthe drum'. Qur invention is, particularly-ap plicable tothe so-called liquid process duplicating machines wherein the master copy is prepared: in mirror script with an inl; which may be dissolved andl transferred to ar copy sheet by the application of a thin film of solvent tothe copyA sheet and` the subsequent pressing cf the copy sheet against/the master sheet.

Itis the principal purpose of-this invention to provide. a novel combination between the drive means for` the drum, the combined feeding and moistening rollers and a feeding device adapted to feed sheetsfrom a stackon the feed tray to the combined feeding and moistening rollers, Heretofore in this art it has been customary tocouple the drumV to` the feed and moistening rollersJrby some sort orf intermediate drive coupling whereby the rollers were given a dwell period during a portion of the rotating cycle ci theV drum and were then geared-directly to the for rotation. Separate means has-,been provided for automatically feedingV sheetsl fr om a. stack. in theV feed tray to the combined feeding andmoisf tening rollers. The feeding and'moistening. rollers are so, driven that after a. sheet is engaged with themv they start slowly and are gradually brought upy to4 a surfacelspe'ed equalto that o f thedrum.

In accordance with our inventionwe havel provided a sheet feeding means in combination with the drum driving mechanism wherein the sheet feeding issequential from the feed roller that, en-

gageSthe stacked sheets o n thefeed tray to the drum andyvplatenroller, eachfeeding section op.- erating onlyso long, as is necessary to' engage the advancing sheet with thelnext feedingfsection,

Our invention contemplates alsoV al novel feed tray construction cooperating with themecha.- nisin justdescribed whereby'l the ifeedftrayreadily adapts itself to longl or short Vsheet feeding either manual or automatic by, thesimple expe# dientfof turningv the tray around. Other improvements are made inthe sheet feeding mechanism, particularly inthe tra-y constructionfor providing proper. side. guide control whichV is so important in, connection with automatic feeding devices.

The nature, and advantages of our invention Will appear, more, fully. from. the, following der scriptin andthe acccmpanyingdrawings where-v in a preferred form of our invention is shown. It should be understood, however, that the drawings and description are not to be taken as limiting theinvention except insofar as it is lim-Y itedby the claims.

Figure 1 isa View in side elevation of a dupli-v cating machine embodying our invention, certain parts of the decorative cover of the m'achine being broken away to illustrate the interior construction;

Figure 2 is a plan sectional View taken on the line. 2 2; of Figure Y. 1

Figure 3 is a sectional'vievv taken on the line 3,-3 of` Figure 2;

Figure 4 is a fragmentary sectional view taken on the line -aof Figure 1;

Figure 5 is a sectional View taken on the line 5-5 of Figure 4;

Figure 6 vis a fragmentary sectional view taken on Athe line 6 5 of Figure 2;

Figure 7 isa fragmentary sectional view taken on theline 1 1 of Figure 6;

Figurel 8 is a sectional view taken on the line ile-8. ofY Figure 7;A

Figure 9 is a perspective view of a drive pinion used in the mechanism shown in Figures 6 to 8 inclusive;

Figure 10 is a. sectional view ltaken on theline Ille-:I0 0f Figure 2;

Figure 11 is a sectional view taken on the line I I-fll of Figurel;

Figure 12 is a perspective view of a springclip that is used in the construction shown inFigures 10 andvll;

Figurev 13 is a fragmentary sectional View taken Q114 the` lineA |3.-`i3 of Figure 2 illustrating the partslin. a changed position from that shown in Figure 1;

Figure. 14v is a fragmentary detail. View of` a part of'themechanism shown in Figure 13 illustrating. a further change in position; A

Figure 15 is a sectional View taken on the line I-5-I5 of Figure 1;

FiguresI

16, 17 and 18 are fragmentary sectional viewsc tirenY ony unel unes aL-lt," nn and Iii-I8 respectivelyof Figure 15; I Y V Figure19, isa sectional view taken on thev line Iil-flitofFigureE Stand v V' v" 2 y Figure 20 a. fra,am@Ilaryv s ,ecticmalf view of a nflodiffedl radi for the-side guides Referring non@ to the,Vv drawing: The present mientonvigsgembqcic inr a vduplicating machine 0i. the. liquidmmcess. type having a. duplicating drum' I provided with master sheet gripping means 2 thereon. The duplicating drum is supported on a drive shaft 3 which is journaled in

bearings

4 and 5 that are mounted in two

side frames

6 and 1. The shaft 3 is hand driven as shown by a hand crank 8 which is secured to a drive pinion 9 that is mounted on a shaft I0 carried by the side frame 6. The pinion 9 meshes with a pinion II that is xed to the shaft 3 on the outside o-f the side frame 6'. A At the end of the shaft 3 opposite the pinion I I the shaft is provided with a plurality of cams I2, I3 and I4. rThe cam I2 operates a pumping mechanism which is not shown herein since it forms no .part of the invention. For the details of this mechanism see the co-pending application of George J. Rundblad, Serial No. 573,413, filed January 18, 1945, for Liquid Process Duplicating Machine. The cams I3 and I4 however, are utilized to drive the sheet feeding mechanism by which the copy sheets are fed to the drum I. The details of this mechanism will be described more fully hereinafter.

A platen roller I is engaged with the drum I' for pressing copy sheets against it. This roller is mounted in the manner shown in the co-pending application referred to above. Combined feeding and moistening rollers I6 and I1 are carried by the side frames 6 and 1 and a spreader roller I8 is also carried by the side frames. Liquid is fed to the trough between the rollers I6 and I8 by a supply tube I9 which receives its liquid through a flexible conduit 26. The pumping mechanism above referred to likewise has a suction tube 2| that withdraws excess liquid from the trough between the rollers I6 and I8, the suction being supplied through a flexible conduit 22 and the pumping mechanism referred to before. The tubes I9 and 2| are supported from a, bar 23 that is carried by the side frames 6 and 1. This bar also carries suitable splash shields 24 and 25. It is believed that the foregoing explanation is sunicient for the purposes of this application to show the operation of the moistening mechanism. For further details concerning this construction reference is made to the co-pending application identied above.

Referring now to Figures 2, 4, 5 and 6 -in particular and the details of the associated figures therewith the mechanism for driving the rollers I6 and I1 will be described. The roller I6 drives the roller I1 by frictional engagement. The detailed mounting of the roller I6 is illustrated in Figure 4. A shaft 26 is journaled at i'ts'opposite ends and two bearing members 21 and 28 that are carried by the side frames 6 and 1 respectively. The roller comprises a sleeve portion 29 of rubber upon a core 30. The core 30 is threaded at its opposite ends for mounting two end seal discs 3 I' and 32 with

spring washers

33 and 34 which press the discs 3| and 32 yieldingly against the end faces of the rollers I6 and I8. The

washers

33 and 34 are held under proper tension by two nuts 35 and 36.

The end of the shaft 26 that projects through the bearing 28 is reduced in diameter as indicated at 31. It has a housing member 38 of a one-way drive clutch secured thereto by a pin 39. A pinion 40 is rotatably mounted on the reduced part 31 of the shaft 26 and has a flattened hub portion 4 I The hub portion 4I extends into the housing 38 and it receives a stamping 42 which has the shape shown in Figure 5. There is another stamping 43 which is circular and which ts in the housing 38 in such fashion as to close the open end thereof, although there is no direct connection between the stamping 43 and the housing 38. The sta-nipi ing 43 however, does carry two pins 44 and 45 which holds two

free rollers

46 and 41 between the housing wall and two flanges 48 and 49 on the stamping 42. The flanges 48 and 49 are set at such an angle as to wedge the rollers against the housing wall when the drive force is imparted in the direction of the arrow that is placed on the stamping 42. However, if the drive force imparted by the stamping 42 of the pinion 40 is in the opposite direction, this will release the

rollers

46 and 41 from driving engagement with the housing 48 so that no driving force will be imparted to the housing. The stamping 43 will be carried along with the stamping 42 by reason of the fact that two springs 50 and 5I couple the two stampings together so as to maintain the anges 48 and 49 in position to hold the

rollers

46 and 41 against the pins 44 and 45. It is believed to be evident from the foregoing description that the pinion 40 is coupled to the shaft 26 by a one-way drive mechanism so that the roller I6 can be driven by the pinion 4D only in the direction of the arrow shown in Figure 3. Also 'the roller I6 can turn in that same direction entirely independent of the pinion 40 which is quite important to the operation of the present device as we will point out later.

Referring now to Figure 6. In this figure the housing 38 and the pinion 48 are illustrated in combination with the drive means for the pinion 40. This drive means comprises an arm 52 which is mounted by a stub shaft 54 to the side frame 1. The arm 52 carries a cam roller 55 which is in engagement with the cam I3. The cam I3 is so shaped that it presents a circular portion to the roller 55 at the -time a sheet is fed to the rollers I6--I1. The radius of the cam increases thereafter, first at a very slow rate then more rapidly. The effect is to start the rollers I6 and I1 very slowly then to bring them up to the same surface speed as the drum by the time a copy sheet has been advanced far enough to reach the platen roller. This provides better moistening and registration than is possible when the rollers IG-I'I are brought up to drum speed suddenly. The free end of the arm 52 has a lateral extension 56 upon which teeth 51 are provided to form a rack engaging with the pinion 40. Each time the drum shaft 3 rotates, it will cause the cam I3 to reciprocate the arm 52, and thus rotate the pinion 4U first in a clockwise direction as shown in Figure 6 and then in the reverse direction. A spring 58 is connected to the arm 52 and to a pin 59 on the side frame 1 toV hold the cam roller 55 in engagement;v with cam I3.

The shaft 54 carries a bell crank lever 60 which; has a cam roller 6I riding on the cam I4. A spring 62 is connected to the lever 60 and to a pin 63 on the side frame 1 so as to hold the cam roller 6I in engagement with the cam. The bell crank lever has an elongated arm 64 extending downwardly and coupled by a pivot pin 65 and a link member 66 to a rack 61. The rack 61 is mounted to reciprocate in two

guides

68 and 69 of a bracket 10 that is journaled upon a shaft 1I. The bracket 10 is held in place by a headed screw 12 that threads into the shaft 1I. The shaft 1I is adapted to drive a sheet feeding roller 13 which is slidably and removably fastened on the shaft, but which is held against rotation by a novel mechanism that will be described more fully hereinafter. The rack 61 engages a pinion 14 that is rotatably mounted upon a reduced end 15 of the shaft 1I. It is this reduced end rial, such as rubber.

vcircle opposite the pin of the shaft 1| that mounts the bracket 10, there being a bearing 16 on the bracket 10 for the reduced end 15 of the shaft. A housing 11 is fixed to the shaft 1| by a pin 18. This housing 11 is one element of a one-way clutch essentially the same as that shown in Figures 4 and 5 of the drawings. Figures 'I and 8 'illustrate the details of this one-way clutch. The pinion 14 has 'a flattened hub 'portion 19 extending through two stampings and 0|. The stamping 3| is lnonrotatably mounted on the pinion 16, but the stamping 80 of course, must be able to rotate at least to a limited Vextent with respect to the pinion and the stamping 8|. Two springs 02 and 83, two rollers 34 and 05 and two

pins

80 and 81 function the same in this clutch as the like parts in the previously described clutch shown in Figures f1 and 5. It is believed unnecsary to repeat the detailed description at this point.

Referring now to Figures 2 and l0 to 12 inclusive, the detailed mounting of the Afeed roller 13 on the shaft 1| is shown in these figures and will be described in connection with them. The roller 13 desirably may be Vof any resilient mate- A core 88 of any suitable metal or other hard material is provided for the roller 13. This core has a pocket 8e cut therein at one end. The side edges of the pocket are undercut as indicated at 90 and 9|. A spring clip 92 extends into the pocket S9. This clip has its back portion 03 wider than its active portion 94 so that the shoulders at 50 and 9| prevent the clip from dropping orf of a pin 95 that extends through the core 83 and through an opening 96 provided in the clip. The portion 94 of the clip bears against a ilat surface 01 provided on the shaft 1|. This flat surface extends from one end of the shaft to a point adjacent the other end so that the roller 13 can be adjusted lengthwise of the shaft with very little difliculty to any position desired by the operator.

The shaft 1| is supported by two arms 98 and 09. These arms are outside the side frames 0 and 1 and are pivotally mounted by a common shaft |00 which is journaled in suitable bearings carried by the side frames 0 and 1. The arm 98 has an extension |0| beyond the pivot point to which a counterweight |02 is attached. The arm 99 has a spring |03 fastened to a pin |04 on the arm and this spring is wound about an adjusting drum |05 and fastened to a pin |00 thereon so that the downward pressure of the roller 13 upon which sheets to be fed to the trough can be varied at the will of the operator. The drum |05 is mounted on a shaft |01 which extends out through the cover Sie of the side frame 6 where it is provided with a handle |03. Figures 15 to 18 show details of the mounting of the drum |05 as well as the detent mechanism for holding the drum in various adjusting positions. A bearing |00 is provided for the shaft |01 in the side frame 6. A plate H0 is mounted against the bearing |09 and the frame 0 and the drum |05 rests against the plate H0. A guide pin is mounted on the side frame 0 and extends through the plate i i0 into a semi-circular groove -||2 that is provided in the drum |05. This limits -the travel of the drum to approximately 180 degrecs` rotation with the shaft |01. The plate ||0 has a series of 4,apertures ||3 covering a semi- A ball ||4 is seated in the drum |05 and spring pressed toward the apertures ||3 by a spring H5 thatis held in place by a screw l0. The handle |08 is fastened to the shaft |01 by a screw ||1 and it is interi locked with the drum |05 by tongues ||8 on the handle and grooves ||9 on an extended portion |20 of the drum |05.

It is desirable to have the roller 13 movable out of the way, for example, when it is desired to feed the sheets by hand instead of automatically. The arm 09 has a dependent portion |2| which carries a three pointed trip latch |22 at its lower end. The trip latch is mounted upon a pivot pin |23 and is held against the head of the pivot pin by a spring |24. The pivot pin |23 is secured rigidly to the lower end of the arm portion |2|. A cam plate |25 is mounted on the side frame 6 and cut out to provide the cam surfaces |26, |21, |23, and |20. The operation of the trip latchis illustrated in Figures 1, 13 and 14. Normally when the roller 13 is in lowered or operative position, the latch |22 occupies the position'shofwn in Figure 1 where two oi' its prongs rest on the cam surface |20. When it is desired to raise the roller and hold it in rest position, the roller is lifted to bring one of the points against the cam surface |20 which is sloped so as to force the trip latch to turn until the latch comes up against the curved upper end of the surface |29. This serves as a stop and the roller is then 'allowed to drop slightly so as to bring the parts to the position shown in Figure 13. This effectively locks the roller 13 in raised position since it is impossible vfor the lever arm 03 to move in a counterclockwise direction so long as one ofthe points of the trip latch is in contact with cam surface |21. In order to release the roller for lowering into work position again, the operator merely lifts the roller again, which turns the trip latch to the position shown in Figure 14, so that it can turn back to the position shown 'in Figure 1 when the roller is lowered.

Referring now to Figures 1, 2, 3 and 19 particularly, the details of the feed tray and 'its cooperation with the feeding devices will be described. This feed tray comprises a rectangular inverted basin |30, the rim |3i of which is provided at its opposite ends with two spaced openings |32 which are adapted to receive mounting pins |33 on across bar |33 of the frame of the machine. The two side portions of the rim |3| carry oppositely'disposed pins 135. The

side plates

6 and 1 have supporting pins E33 thereon for the rim |3| to rest upon. The pins |35 constitute means for latching the tray in position by a latch mechanism that is carried on the side frames 3 and 1. This latch mechanism is shown best in Figures 3 and 19. An upstanding 'plate |31 is fastened to the side frame. It is notched at the top as indicated at |33 to receive 'one of the pins |35. A pivoted lever |35 is pivoted directly over the plate |31. It has a lug |40 that overlaps the plate |31. A spring lfii is connected to a pin |42 on the side frame and to a lug M3 on the lever |33. The lever |39 has a hook portion |54 at its upper end adapted to hook over one of the pins |35 seated in the notch |38 and thus latch it in position. The lever 39 projects above the level of the base |30 and this base has four slots |35 (see Figure 2) properly situated to pass the end of the lever regardless of which end ci the tray happens to be facing the cross bar i3d. In order to release the tray, all the operator has to do is to press the projecting portions of the levers toward the duplicating drum and then the tray can be lifted up and removed.

The trayis-providedat itsopposite ende with two scales |46 and |41, the scales being duplicates. It is also sometime desirable to provide adjacent to the scales, friction pads as are indicated in Figure 3 at |48 and |49. These friction pads may be of rubber or of other material which will hold a stack of sheets with sufficient friction to prevent the entire stack from sliding when the top sheet is withdrawn by the sheet feeding roller 13.

Two side guides |50 and |5| are mounted for adjustment toward and away from each other on the base |30. The base is provided with a transverse slot |52 midway between its ends. The side guides are angular metal strips having horizontal portions resting on the base and vertical portions serving as guides. Tongues |53 and |54 are struck down from the horizontal portions of the side guides into the slot |52. On the outside of each side guide there is mounted a U-shaped member |55, the lower flange of which is the longer. This lower flange has a lug |56 struck down into the slot |52. A clamping bolt extends throughl the upper and lower flanges of each of the members |55. This bolt has a reduced lower end portion |58 extending through the slot |52 and threaded into a nut |59 so that the guides may be clamped in any desired position or removed if desired. In order to prevent the nut |59 from falling, a channel is provided by two Z-shaped bars |60 and |6| welded to the under surface of the base |3|. In order to keep the bolt |51 in position a snap ring |62 is provided between the upper and lower flanges of the members |55.

Each side guide carries a gripping pad |63. The gripping pads are mounted in such fashion that they can be replaced whenever desired. A cup shaped member |64 is welded to the outside of the vertical portion of the side guide and a leaf spring |65 is seated in this cup shaped member. The pads |63 are made of some such material as sponge rubber and they are mounted in shallow pans |66 which are flanged at the edges as indicated at |61. The pan surface bears against the leaf spring so that there is a fairly even pressure of the pads against a bundle of sheets placed between them in the manner illustrated in Figure 19. When the pads become damaged, or for any other reason it is necessary to remove them and insert a new pad, they may be compressed and pulled out through slots |68 which are provided in the horizontal portion of the side guides (see Figure 19) Figure 20 shows a modified pad |63 in which the surface is covered by a leather facing |69. This facing is secured on the sponge rubber in any way; for example, by adhesive. A good material to use for the facing is chamois skin which is a very soft pliable leather.

It is believed that the foregoing description will enable those skilled in this art to understand and take advantage of the novel features disclosed herein. The feed tray just described can be reversed end for end from the position shown in Figure 2 to the position shown in Figure 3 and thus accommodate the gripping pads |63 to long sheets or short cards with no difficulty. The feeding roller 13 can be moved into and out of operative position at the will of the operator.

Both the feeding roller '|3 and the moistening roller I6 are positively driven from the drum in timed sequence so that the feeding roller 'I3 can first shove the copy sheet against the meeting faces of the rollers I6 and and buckle the sheet in the manner indicated at Figure 3 before the roller I6 begins to turn in sequence. Then the roller I6 turns slowly at first to make sure that the buckled sheet is properly engaged in the notch formed by the rollers |6 and and advances the sheet at the proper time to engage its forward edge with a forward edge of a master sheet on the drum as the forward edge of the master sheet reaches the meeting point of the drum and the platen roller. After the copy sheet is grasped between the master sheet on the drum and the platen roller, the driving of the roller |6 is finished. The rotation of the drum merely pulls the sheet through the rollers turning them as it does so. Because of the clutch mechanism between the driving means and the rollers this can be accomplished and no adjustment is needed for long or short sheets up to the limit of the drum circumference. For very short sheets the roller I6 rotates only so far as is necessary to moisten each short sheet, thereby saving liquid and avoiding danger of spreading excess moisture on the rollers. However, if a long sheet is being fed, the roller |6 is effective to moisten the entire sheet. Our improved driving means therefore, imposes no limitation on the use of the machine and it relieves the drum of the necessity of driving a lot of gearing and intermediate mechanism.

Having thus described our invention, we claim:

1. A duplicating machine comprising a drum, lnaster sheet gripping means thereon, a feed tray having means thereon to support a stack of copy sheets thereon, sheet feeding and moistening rollers interposed between the feed tray and the drum, drum driving mechanism, sheet feed means operable from said mechanism to advance copy sheets to the bite of the rollers while the drum is turned a portion of one revolution, drive means comprising a member positively driven in one direction by said driving mechanism to start said rollers slowly after said sheets have been advanced to said rollers and accelerate them to the same surface speed as the drum while the drum is turned another portion of a revolution, a platen roller cooperating with the drum to receive the advancing end of a copy sheet therebetween when it is brought up to the speed of the drum by said rollers, said drive means including a one way clutch member releasing to permit said rollers to turn in response to pull on the copy sheet by the drum and platen roller and lconnecting one of said rollers with said driven member to be positively driven thereby only by movement of said driven member in said one direction, said sheet feed means comprising a roller, and means for positively driving the same by said mechanism only during the rst named portion of the drum revolution, said means including one way clutch means permitting said roller to turn in response to pull of the feeding and moistening rollers upon a copy sheet under the roller, the driving means for said sheet feed means being independent of the driving means for said feeding and moistening rollers.

2. A duplicating machine comprising a drum, master sheet gripping means thereon, a feed tray having means thereon to support a. stack of copy sheets thereon, sheet feeding and moistening rollers interposed between the feed tray and the drum, drum driving mechanism, sheet feed means operable from said mechanism to advance ycopy sheets to the bite of the rollers while the drum is turned a portion of one revolution, drive means comprising a member positively driven in one direction by said driving mechanism to start said rollers slowly after said sheets have been advanced to said rollers and accelerate them to the same surface speed as the drum while the drum is turned another portion of a revolution, a platen roller cooperating with the drum to receive the advancing end of a copy sheet therebetween when it is brought up to the speed of the drum by said rollers, said drive means including a one way clutch member releasing to permit said rollers to turn in response to pull on the copy sheet by the drum and platen roller, comprising a driven member driving one of the rollers, a drive member mounted for rotation in one direction on said driven member, means for causing said driven member to rotate with the drive member in the opposite direction, and means actuated by the member actuated by said drive mechanism for turning said drive member alternately in opposite directions, said means turning said drive member in the direction to rotate said drive member during movement of said positively driven member in said one direction.

3. In a duplicating machine, a drum, means for rotating said drum, and means for feeding a copy sheet to said drum from a stack, comprising a feed roller for removing a sheet from the stack, and a pair of rollers to which said feed roller feeds said sheets, one of said pair f rollers being a combined feeding and moistening roller, and means for successively rotating said feed roller and said feeding and moistening roller in a feeding direction comprising a pair of cams mounted to rotate with said drum and having a predetermined relative position and a driving connection between each of said cams and the roller actuated thereby each comprising a member positively driven by said cam in one direction, and means interposed between said member and said roller to drive said roller in only said one direction.

4. In a duplicating machine, a drum, means for rotating said drum, and means for feeding a copy sheet to said drum from a stack, comprising a feed roller for removing a sheet from the stack, and a pair of rollers to which said feed roller feeds said sheets, one of said pair of rollers being a combined feeding and moistening roller, and means for successively positively rotating said feed roller and said feeding and moistening roller in a feeding direction comprising a pair of cams mounted to rotate with said drum and having a predetermined relative position and an independent driving connection between each of said cams and the roller actuated thereby, each comprising a follower positively driven by its cam in a feeding direction and a one way clutch in each of said driving connections driving the roller associated therewith only during movement of said follower in said feeding direction.

5. In a duplicating machine, a drum, means for rotating said drum, and means for feeding a copy sheet to said drum from a stack, cornprising a feed roller for removing a sheet from the stack, and a pair of rollers to which said feed roller feeds said sheets, one of said pair of rollers being a combined feeding and moistening roller, and driving means for successively positively rotating said feed roller and said feeding and moistening roller in a feeding direction comprising a pair of cams mounted to rotate with said drum. and having a predetermined relative position, a follower for each cam, levers mounted for oscillation each having one of said followers thereon, said levers being related to said cams to be each positively moved by one of said cams in a feeding direction, rotatable members, each lever having means thereon for driving a rotatable member, a one-way clutch between said feed roller and one of said rotatable members, and a one-way clutch between said feeding and moistening roller and the other of said rotatable members, said one way clutches driving each of said rollers only during positive movement of the lever included in its driving means.

6. In a duplicating machine, a drum, means for rotating said drum, and means for feeding a copy sheet to said drum from a stack, comprising a feed roller for removing a sheet from the stack, and a pair of rollers to which said feed roller feeds said sheets, one of said pair of rollers being a combined feeding and moistening roller, a pair of pivoted arms, a shaft mounted on said arms, said feed roller being mounted on said shaft to rotate therewith, resilient means normally urging said arms in a direction to engage said feed roller with said stack, means for holding said arms in a raised position from said stack and against movement responsive to said resilient means, and means for driving said feed roller intermittently in only one direction comprising a. pivotally mounted lever, means for oscillating said lever, a rack pivotally connected with said lever and having means mounted thereon for driving said feed roller comprising a pinion meshing with said rack and a one-way clutch interposed between said pinion and said feed roller.

ERIC W. PETERSON. GEORGE J. RUNDBLAD.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date Re. 22,406 Rockhill Dec. 14, 1943 2,204,715 Wimmer June 18, 1940 2,222,984 Marchev Nov. 26, 1940 2,260,045 Morrison et al Oct. 21, 1941 2,260,463 Kropp Oct. 28, 1941 2,268,045 Marchev Dec. 30, 1941 2,299,974 Grobecker Oct. 27. 1942 2,343,187 Jagger Feb. 29, 1944