US2240026A

US2240026A - Duplicating machine

Info

Publication number: US2240026A
Application number: US280036A
Authority: US
Inventors: Maurice R Avery
Original assignee: Ditto Inc
Current assignee: Ditto Inc
Priority date: 1939-06-20
Filing date: 1939-06-20
Publication date: 1941-04-29
Anticipated expiration: 1958-04-29

Description

April 29, 1941. M. R. AVERY DUPLICATING MACHINE 8. Sheets-Sheet 1 Filed June 20, 1939 M R AVERY 2 24mm DUPLICATING MACHINE Filed June 20, 1939 8 Sheets-Sheet 2 Apxriifi 2%, 1Q$L M R AVERY DUPLICATING MACHINE Filed June 20, 1939 8. Sheets-Sheet 3 M P s.

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Aprifl 29, 1941. M. R. AVERY DUPLICATIN'C- MACHINE Filed June 20, 1939 8 Sheets-Sheet 4 April 29, 1941. M. R. AVERY 2,240,026

DUPLICATING MACHINE Filed June 20, 1939 8 Sheets-Sheet 5 JZMH/WJ 7/hmztw? Jae y,

April 29, :M AVERY DUPLICATING MACHINE Filed June 20, 1959 8 Sheets-Sheet 6 April 29, 1941. W AVERY 2,240,026

y DUPLICATING MACHINE Filed June 20, 1959 a sheets-sheet 7 law ra or s April 29, 1941.

M. R. AVERY DUPLICATING MACHINE Filed June 20, 1939 8 Sheets-Sheet 8 Faiented itpra 2% lideill estates normoarma henchmen? Maurice msilvery, Wauwotmaliiin, to mittmlincorporated, lilhiongo, lit, a corporation of? Virginia Application .llnne to, was. serial No. emcee (or. ion-net) 2d Malinda This invention relates to duplicating machines of the liquid process type in which a master sheet is carried by a rotatably mounted drum and a copy sheet is carried into impression relation ship with the master sheet at each revolution of the drum, and it has for its object the provision of a new and improved form and arrangement of parts by which a single line or some other fractional portion of the-subject matter on the master sheet may be copied at each revolution of the drum, the arrangement preferably to be such that there may be a readjustment between each two revolutions of the drum so as'to produce different copy for each copy sheet in turn.

in the preferred embodiment of this improved machine, means is provided for tucking the master sheet into an opening in the drum in the form oi a loop and for progressively shifting the end portion of the master sheet so as to vary the length of the loop and to change the portion of the master sheet at the printing point adjacent to the mouth of the opening in the drum. For accomplishing this result, a roller is provided adapted to he moved inwardly in engagement with the outer face of a master sheet for pressing the master sheet into the opening and into pressure relationship with a forwarding roller rotatably mounted within the drum, means being provided for giving said forwarding roller a rotary movement at a predetermined point in each revolution of the drum for shifting the loose end portion of the master sheet. In the arrangement shown, the actuation of the forwarding roller is eflected through the medium of a cam adapted to give an outward movement to a slidably mounted pawl in position to engage a ratchet the loop-forming roller is caused to move under control into operative position for producing the desired even loop in the master sheet.

In the arrangement shown, means is provided for moving the cams out of operative position when desired. Thus the operator is enabled to arrange for actuation of the gripping and loopforming means at the time when a new master sheet is being applied into position and not duning the normal operation oi the machine there uuence of operation of the forwarding roller so as to provide for as many mpies as may he de slilrei oi any particular petition of the matter 5 ee This invention comprises also an alternative form and arrangement of mrts in which the op erating means for actuating the roller by which the master meet is tucked inwardly into the opening in the drum is connected up for operation in time relation with the gripper operating means of the type heretofore used in liquid proc= ess machines. The arrangement shown comm'ises a cam pivotally mounted in position along side ci a pivotally mounted cam employed ior opening the. grippers and moved into operative position by the same means, such cam heing ar ranged for cooperation with a train of parts for moving the tucking roller outwardly against the action of a spring. The structure comprises an added lever for controlling the position of rm other cam which when in its operative position serves at each revolution of the to cause a shifting of the master sheet for b r a dif= ierent portion of such master sheet to opera tive printing position.

The invention employs in addition a guard plate preferably of sheet metal removahiymoimt ed in position over the free end portion of the master sheet so as to protect such portion oi the master sheet from direct contact with the platen roller. bridging member for closing the a: r in the face of the drum through which the master sheet is pressed in the form of a loop. m some cm a bridging member is employed in the form of a comparatively heavy metal foil which is adapted to be mounted in position underneath the master sheet in cases where the machine is to be operated in the ordinary manner for making full length copies without the use of the master sheet shifting means.

It is another object of this invention to im prove apparatus of this type in sundry details hereinafter pointed out. The preferred means by which the several objects of the invention have been accomplished are illustrated in the accomdenying drawings, in which- Fig. l is a side face view of the preferred form I cl machine embodying the invention as seen from side of the machine removed;-

Fig. 2 is an enlarged detail view, being largely a, vertical sectional view through the moistening mechanism oi the machine;

after, and is enabled to interrupt the normal se Fig. 3 is a vertical sectional view taken suh- The invention inciud also a.

' to such container.

stantially at the line of Fig. 4, or taken on an enlarged scale at the line 33-43 of Fig. 1;

Figs. i and are vertical sectional views taken substantially at the line 5- 3 and the line 5-5, respectively, of Fig. 3, but with some of the parts in changed position;

Fig. 6 is a view similar to a portion of Fig. 4 but showing a changed position of the parts;

Fig. 7 is a top plan view of a modified form of machine with some parts shown in section;

Figs. 8 and 9 are vertical sectional views taken substantially at the line 8-8 and the line 9-t, respectively, of Fig. 7;

Fig. 10 is a vertical sectional view similar to a portion of Fig. 8 but with certain of the parts removed and with the operating levers and cams in changed position;

Fig. 11 is a vertical sectional view taken substantially at the line ill-ll of Fig. '7;

Fig. 12 is a View similar to Fig. 11 but with the parts in changed position and with an extra guard plate applied;

Fig. 13 is a top plan view of the machine as seen in Fig. 12 but on a smaller scale; and

Fig. 14 is a view similar to a portion oi Fig. 11 but with some or the parts omitted and with a supporting metal foil plate underneath the masrangement shown, the standards it and El are reinforced by plates 24!. The standards 2d and 2! are further braced with respect to each other by a transversely positioned sheet metal angle bar 25, as is best shown in Fig. 1. In the arrangement shown, the shaft 23 is provided with a gear 26 fixedly mounted thereon which meshes with a pinion 27 which receives power from any suitable source for rotating the drum 2?.

Adjacent to the drum 22, I have provided two rotatably mounted rollers 28 and as between which a copy sheet at is adapted to be fed forwardly (toward the right in Figs. 1 and 2). In

the arrangement shown, a moistening mechanism 8! of any suitable type is provided comprising an absorbent pad 32 which extends into engagement with the top forwarding roller it for applying a thin film of liquid solvent upon the face of such v roller. In the arrangement shown, solvent is supplied to the moistening mechanism 3i through a flexible pipe 33 from a pump 536 which takes the solvent from a container 35. An overflow pipe 38 connects the moistening mechanism at with the container for returning surplus solvent In the arrangement shown, the pump 35 is operated by power from the drum 22 through the medium of a lever 31 pivotally mounted at 8% upon the framework, the lever 31 being connected directly with the plunger of the pump. The lever 31 is actuated by a cooperating arm or lever to pivoted'on the same axis with the lever ti and provided at its free end with a roller tit engaging a cam 6i fixedly mounted upon the shaft 23. A spring t2 normally holds the arm or lever 39 moved to the limit of its motion in position by means of a supporting shaft db. 1

By an adjustment of the cam about the axis lever ill! downwardly is controlled for regulating the amount of solvent or other liquid delivered by the pump through the pipe At the front of the machine (at the left in Fig. 1), I have provided a tray or table ii for supporting a pile of copy sheets in position to be fed into the bite of the rollers 2t and 29.

In the construction illustrated, the forwarding roller 2b is driven by power from the shaft 22 by means of a large gear d8 carried by the shaft 23 so as to drive an idler pinion t9 which in turn drives a pinion 5t carried by said roller. The arrangement is such that upon rotation of the drum 22 in counter clockwise direction in Fig. 1, the roller 2% is driven also in counter clockwise direction in said figure at the same surface speed. The cooperating forwarding roller 29 is driven in clockwise direction in said Fig. 1 by engagement with the roller 28 or with a copy sheet interposed between the rollers, as shown in Fig. 2.

A platen roller 5i is rotatably mounted in position to engage the face of the drum 22 for pressing, a copy sheet into impression relationship with a master sheet carried by the drum as hereinafter described. In the arrangement shown, the platen roller 59 is supported in position by means of bellcranlr levers 55.? at opposite sides of the machine, such levers 52 being adjustable by means of bolts 53 and cooperating means as shown in Fig. 1. A receiving tray 56 is mounted in position for receiving the copy sheets as they As is clearly shown in Fig. 3, the drum comprises two end plates 55 and 56 rigidly mounted upon the shaft 23 and connected by a cylindrical wall portion til which is provided with an opening 58 therethrough at one side of the drum. Between the end plates 55 and 56, I have rotatably mounted a roller 59 spaced inwardly a short dis-= tance from the outer face oi the drum, as is best shown in Fig. 5, such roller being mounted in position by means of a shaft 6d. At a short distance in advance of the roller 5b, with respect to the direction of rotation of the drum 22 as indicated by the arrow in Fig. 4, I have pivotally mounted the arms ti and 62 of a heavy yoke upon which a roller 68 is iournaled, as is best shown in Fig. i, the roller in the arrangement shown being positioned in fairlyclose proximity to the cross bar portion lid of the yolse. The arrangement is such that when the arms and 82 are moved inwardly, the roller bit is carried into and through the opening 58 in the drum so as to be brought into pressure relationship to the roller 59 within the drum. A coiled spring 85 normally holds the yolre moved inwardly to the limit of its motion, as shown in mg. 5. i

At a short distance in advance of the yoke upon which the roller 88 is mounted, I have provided another opening 665 through the wall of the drum, as shown in Fig. d, within which a gripper bar fill is adapted to lit, as shown in Fig. 5,, for holding one end of a master sheet 68 in position on the drum. In the arrangement shown, the gripper bar bl is provided with inwardly extending arms (it which are slidably mounted with respect to the drum, being normally held in their operative gripping position as shown in Fig. 5 by means otcoiled springs l6 connzcted with said as shown in Figs. 3 and Upon one end of the shaft be of the roller 59, I have fixedly mounted a ratchet wheel Ii. Ad-

of the shart (iii the length of the stroke of the jacent to the ratchet wheel upon the outer face pass between the platen roller ti andthe drum.

of the end plate 56 of the drum, ll have provided a slide bar it which is slidably mounted within a sleeve it, a coiled spring l l serving normally to hold the slide l2 at the innermost limit of its movement. Upon the slide it, I have pivotally mounted a pawl it in position to the ratchet wheel 5 i, the pawl it being normally pressed by a flat spring iii into engagement with the ratchet wheel.

For effecting automatic control oi the gripper bar til and the tucking roller t3, and for automatically effecting rotary movements of the roller iiil in the desired timed relation, I have provided cam means ill and it, as shown in Fig. 4. The cam member it is slidable laterally of the machine upon pins or rods it which are slidable longitudinally within suitable openings in the framework of the machine, being provided with a cross bar W on their outer end portions for enabling them to be moved readily for carrying the cam ll into and out of operative position. The cam ii in its operative position as' shown in solid lines in Fig. 3, is located in the path of a roller bi carried by the armat of the yoke upon which the roller hit is mounted. In such operativ position, the cam ll is also in the path of a roller 82 carried by an arm 33 in position to engage the arms upon which the gripper bar $7 is mounted. The cam "iii is likewise slidably mounted with respect to the drum, being supported by pins or rods 84 slidabiy mounted in the framework and provided with a connecting bar 85 on their outer ends for ready manipulation of the cam. When the cam "it is in its operative position as shown in solid lines in Fig. 3, it is in the path of a roller 8% carried by the slide it upon which the pawl i5 is mounted.

With the cams ll and it moved to their innermost positions as. shown in solid lines in Fig. 3, and with the parts in the position as shown in Fig. l, the roller is held by the roller ti and the cam ii at the limit of its outward movement. With the parts in this position, a master sheet lid is inserted in position upon the drum between the rollers iiii and $3, with its forward edge in engagement with the gripper bar t'l which is being held at the same time by the roller 82 and the cam ill in opened position. When the drum 22 has been rotated a short distance in clockwise direction from the arrangement as shown in Fig. 4 to that shown in Fig. 6, the roller it? is carried out of effective engagement with the cam ill so as to permit the springs ill to carry the gripper bar ull inwardly to operative position for gripping the leading edge oi the master sheet When the drum has been moved still further in clockwise direction from the position as shown in Fig. 6, the roller iii is adapted to pass out of engagement with the cam ill so as to permit the spring to carry the roller inwardly through the opening til so as to bring the roller into pressure relationship with the roller til, butwith the master sheet til interposed between the rollers, the master sheet t8 being pressed inwardly ahead of the roller into the form of a loop. After th'm result has been effected, the cam ii is ordinarily moved outwardly (toward the right in Fig. 3) into the position as shown by dotted lines in said Fig. 3 so that upon the next succeeding revolution of the drum the cam ll shall pass the rollers ti and BE without in any way affecting the into engagement with the cam "it, the slide it and the pawl it are moved outwardly so as to cause the roller 59 to have a limited rotation in clockwise direction in Fig. d. .Buch clockwise rotation of the roller til serves to move the engaged portion of the master sheet lit toward the right in Figs. 4 and 5, inasmuch as the master sheet is under such circumstances efiectiveiy gripped between the rollers lit and lit. This results in a slight increase in the size of the loop formed in the master sheet 68, the arrangement preferably being such that the master sheet is shifted through a distance corresponding to the spacing between lines of copy on the sheet. its will be readily understood, upon each. succeeding revolution of the drum 22 the master sheet is shifted an additional step toward the right in Fig. 5 for progressively increasing the size of the looped portion of the sheet.

In the use of the machine as above described, the copy sheets are fed one at a time to the for-- warding rollers 28 and to by which said sheets are aligned for assuring that the copy from the master sheet shall be aligned accurately across the copy sheet. The master sheet is so arranged that the leading margin is bare and arranged so that the first line of subject matter to be copied from the master sheet is positioned initially at a point immediately at the left oi the bar t l oi the tuckingroller arrangement as shown in Fig. 5. The arrangement is such that the rear edge portion of the copy sheet is brought into impression relationship with the line of subject matter on the master sheet next adjacent to the opening bit. The result is that upon the first operation of the machine following the application of a new master sheet, the leading line of subject matter on the master sheet is printed upon the bottom line portion of the first copy sheet presented; upon the second rotation of the drum the second line of copy on the master sheet is printed on the bottom line portion of the second copy sheetssuch successive printing of diii'erent lines upon different copy sheets continuing until the master sheet has been shifted sumciently for bringing the last line of copy thereon into the printing position. In case it should be desired that a plurality of copy sheets be made with respect to any one or more of the lines of copy on the master sheet, this result is attained by a timely movement of the cam it out of operative position so as to interrupt temporarily the normal sequence of operations.

When a new master sheet is to be applied to the drum in place of an old master sheet, the cam Til is moved into operative position as shown in solid lines in Fig. 3. When the. parts reach the position then as shown in Fig. i, the old master sheet can be removed manually from the drum and a new master sheet can be placed in position corresponding to the arrangement as shown in Fig. 4.

In the construction as shown in Figs. 7 to ii inclusive, the arrangement is in eflect very much the same as that above described. The arrangement is however modified with respect to no of the details for adapting the invention to a well-known form of machine.

In the arrangement as shown in Figs. 7, d and 9, the framework ill of the machine supports drum Bil rotatably mounted in position upon a shaft iiii. Forwarding rollers ilii and iii are pro vided (see Fig. 9) arranged for feeding copy sheets to the drum, such iforwar rollers being driven by means of a pinion iii, an idler pinion at aaaopae t3 and a gear fi l carried by the shaft 89, as shown in Fig. 8. The roller 90 is to be moistened with a suitable solvent preferably in the manner indicated in connection with the arrangement first described. A platen roller 95 is provided (see Fig. 8) for pressing a. copy sheet into impression relationship with a master sheet mounted on the drum as hereinafter described.

In the arrangement shown, the drum 88 is provided with a plurality of grippers 96 mounted on a rock shaft 97 with coiled springs 98 and pins. W holding the grippers in the desired operative position with respect to the shaft. For controlling the position of the shaft 91 and the grippers carried thereby, the shaft is provided with an. 1

arm I96 fixedly mounted thereon, having a roller WI rotatably mounted on its free end portion for engagement with a cam as hereinafter de-' scribed. A coiled spring I02 normally holds the arm Itfl moved inwardly to the limit of its motion for holding the grippers closed, as shown in Fig. 11.

The cam provided as above suggested for operation with the roller IDI is indicated by the reference character I03, being pivotally mounted at its end portion, toward the right in Fig. 8,

upon a pin lil l'carried by 9. lug I65 extending from the framework of the machine. A coiled spring I05 engaging a pin I0? carried by the cam and a pin I08 extending from the framework holds the cam I03 normally turned to the limit of its motion in counterclockwise direction in Fig. 8. For controlling the position of the cam and for moving it outwardly against the action of the spring IIJG, I have provided a lever I09 pivotally mounted on the shaft 89, such lever being provided with a roller IIB rotatably mounted thereon in position to engage the bottom edge face of the cam. When the lever is given a movement in counterclockwise direction in Fig. 8, the roller IIfl serves to force the cam upwardly into position for engagement with the roller Itl, as shown in Fig. 10, for rocking the shaft 91 so as to cause the grippers 96 to open as shown in said figure, such action'taking place at a predetermined point in each revolution of the drum 8%. Inasmuch as the parts as above described in con- This means in the construction illustrated comprises arms IIs fixedly mounted on a shaft IN journaled between the end walls of the drum 88, the arms I I9 being in position to engage the inner ends of the arms H5 and H5 for applying pressure outwardly on such arms. For rocking the shaft I26, I have provided an arm I2I fixedly mounted thereon, having a roller I22 rotatably mounted upon its free end portion, such roller I22 being in positionto engage the top edge face of a cam I23 rotatably mounted upon the pin I06 which supports the cam I03.

The arrangement of the tucking roller H t and its associated parts is such that when the lever use is moved in counterclockwise direction in Fig. 8 to the position as indicated in Fig. 10, the cam I23 is raised by the action of the roller Ilil into the position as shown in said Fig. 10. The arrangement is such that when the drum 88 rotates in counterclockwise direction in Fig. with the remaining parts in the position as there shown, the grippers 96 are opened through the action of the cam I03 and the arms I2I and H9 that as the drum rotates in counterclockwise nection with Figs. 7 to 14 form in and of themselves no part of my present invention, it is believed to be unnecessary to describe their construction or operation further.

As is best shown in Fig. 11, the cylindrical wall portion of the drum 88 is provided with an opening III therethrough at a point a little in rear of the grippers 95 with reference to the counterclockwise direction of rotation of the drum in said figure. In the drum 88 directly opposite to the opening III, there is a roller H2 rotatably mounted by means of a shaft H3 upon which the roller is fixedly mounted, such roller H2 being spaced at a short distance inwardly from the face of the drum. For supporting a tucking roller II l movably in position opposite the roller II2, I have provided arms H5 and H6 slidably mounted on the end walls of the drum at the ends of the roller H2, such arms being slidable between guides II'I. Springs II8'serve normally to hold the arms H5 and H6 and the roller lit at the limit of their movement inwardly, as shown in Fig. 12, with the roller Ilil applying pressure inwardly on the roller H2.

Means isprovided for moving the roller IIlil outwardly against the action of the springs I IS in-.

to the position as shown in Fig. 11 with the roller M l spaced outwardly from the face of the drum.

direction in Fig. 10, the roller lIlI by engagement with the cam I05 serves to cpen the grippers and the roller I22 by engagement with the cam I23 serves to move the tucking roller II l outwardly into the position as shown in Fig. 11. With the grippers 96 held in open position as shown in Fig. 10 and with the roller I It held in outwardly retracted position as shown in Fig. 11, a master sheet I24! is placed in position on the face of the drum underneath the roller lit with its forward edge engaged by the grippers 96. Upon the continued counterclockwise rotation of the drum in said Figs. 10 and 11, the grippers 96 are first closed under the control of the roller Ill! and the cam I83, and the roller II l is thereafter moved inwardly under the control of the roller I22 and the cam I23. As the roller IIl moves inwardly into engagement with the master sheet IZ whose forward edge is at that time gripped by the grippers 96, the master sheet is tucked through the opening III in the wall of the drum and is brought in the form of a loop into pressure relationship with the roller H2 so as to be movable by the cooperative action of the rollers H2 and lid. As is clearly shown in Fig. 11, the arms H5 and Hit are cut away at I25-for enabling the arms t6 extend past the shaft MB of the roller M2. 1

For giving the roller H2 intermittent rotary movement upon successive revolutions of the For rotating the pinion I2t in cmmtercloc direction in Fig. 9, I have provided an arm its pivotally mounted on the shaft Hi3 provided with a pawl I3I pivotally mounted thereon so as to engage the teeth of such pinionifit. A coiled spring I32 is connected at one with the arm we and is connected at its opposite end with an arm I33 in the form of a cam as hereinafter described, serving normally to swing the arm I33 to the limit of its motion in clockwise direction in said Fig. 9. A pin I34 mounted in the framework of the machine limits the clockwise movement of the arm I33 in said Fig. 9. As will be readily understood, when the arm I3d is given a swinging movement in counterclockwise direction in Fig. 9, the pinion I23 and the roller I I2 are rotated in counterclockwise direction in said figure.

For giving the arm I33 a swinging movemen at a predetermined point in each revolution 01 the drum 38, I have provided a lug I 35 on the cam arm I33 extending past the edge of the arm I33 so that when the arm I33 is swimg toward the left in Fig. 9 the arm I33 is caused to move also toward the left for producing a rotary movement of the pinion I26 and the connected roller I I2.

For giving the cam arm I33 swinging movements inwardly upon successive revolutions of the drum, I have provided a cooperating cam plate I3t slidably mounted upon the framework of the machine by means of a pin I3I working in a slot I33 of the cam plate. Fbr cooperation with-the cam plate I36, I have provided an operating lever "I33 pivotally mounted upon the framework adjacent to the cam plate and pivotally connected with said cam plate by means of a rivet I at (see Fig. 9). At an intermediate point on the lever I33, I have pivotally connected 2. link III which extends thence upwardly, its upper end being pivotally connected with an arm I II which is pi'votally mounted upon a pin I43, a lever or handle I44 being connected with the arm I32 so as to swing therewith. The arrangement is such that when the lever I44 stands in upright position as shown in Fig. 8 the link III holds the arm I33 in turned position as shown in Fig. 8, such arm I39 in turn serving to hold the cam I33 projected toward the right in said Fig. 8 opposite the gear 35. When however the lever I36 is moved outwardly into the position as shown in Fig. 9, the arm I39 is swung outwardly for holding the cam plat I35 in outwardly shifted position. The arrangement Is such that when the cam plate I38 stands in the position as shown in Fig. 8 it engages the cam arm I33 upon each revolution of the drum for forcing such cam arm I33 inwardly for causing a rotary movement of the roller II 2. As is clearly shown in Fig. 8, the link III is adaptedto pass centers with'respect to the arms I33 and I 43 so as to be efiective for preventing retraction of the cam plate I36 except as the lever I43 is swung toward the left into the position as s own in Fig. 9.

In the use oi the machine as above described, a master sheet I24 is applied in position upon the drum and promptly tucked through the opening III. After the master sheet has been applied in position, the lever IE3 is moved manually from the position as indicated in Fig. to the position as shown in Fig. 8. Upon each revolution of the drum thereafter, with the lever I44 in the position as shown in Fig. 8, the master sheet I24 is shifted for progressively increasing the size of the loop, until the entire quota of subject matter has been copied from the master sheet upon a series of c py sheets. If it is desired that more than one copy be made of any-particular line of the subject matter on the master sheet, the lever I44 is moved outwardly to the position as shown n Fig. 9 for retracting the cam plate I36 tem, .rarily from operative position. The arrangement preferably Is such that the master sheet is moved at each actuation through a distance corresponding with the spacing between lines thereon.

In Fig. 12, I have shown preferably of sheet metal the face of the drum, such guard plate being removably secured in position upon the drum so as to cover the greater portion of that part of the master sheet I24 in rear of the tucking roller II I. As is shown in F g. 13, the master sheet is all covered at the right of the roller III except for the small portion at the normal printing position immediately adjacent to said roller. In the arrangement shown, the guard plate is held in position by means of spring clips I46 carried by the drum at opposite ends thereof, as is best shown in said Fig. 13. By the use of the guard plate I33, the master sheet is protected from direct contact with the platen roller at the end portion of the master sheet beyond the bottom edge of the copy sheet. Inasmuch as the platen roller is kept dry at all times, the use or the guard plate is not essential, but the sharpness of the copy on the master served by the use of the In the is shown a master sheet III secured upon the drum 33 together with a sheet N3 of metal foil, the foil being secured In position with the master sheet by the grippers 9B. The metal foil member I It is for use when the machine is being used for general work without any shifting of the master sheet, the foil being employed for bridging the opening III so as to provide support for the master sheet at this point.

By, the use of my improved construction, I am enabled to produce a series of copy sheets each bearing a difi'erent copy from the remaining sheets. This eXpedientm/ay be desired In connection with the production of pay checks from a master sheet in the form of a pay roll, or it may be used under any other suitable circumstances where such m arrangement may be desired. It will be understood that I prefer to employ the form and arrangement of parts as shown in the drawings and as above described, but my invention is not to be limited thereto except so far as the claims may be so limited, it being un. arstood that changes might well be made in the form and the arrangement oi parts without departing from my Invention.

I claim:

1. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, gripper means for securing one end of a master sheet on the outer face of said drum adjacent to said opening, a roller rotatably mounted in said drum opposite to said opening, means engaging an intermediate portion of said master sheet for pressing it firmly against said roller, and means adapted upon each revolution of said drum to give said roller a rotary movement for bringing a different portion of said master sheet into printing position on the outer face of the drum adjacent to said opening.

2. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its well along one side thereof, gripper means for securing one end of a master sheet on said drum adjacent to said opening, a. roller journaled in the end walls of said drum opposite to said opening, a second roller rotatably mounted on said drum so as to be movable toward and a guard plate I45 curved to conform to sheet is better preement aim in Fig. 14,1 have from said first-named roller for pressing an intermediate portion of said master sheet into engagement with said firstined roller, and means adapted upon each vvolution of said drum to give said first-named roller a rotary movement for bringing a diiferent portion of said master sheet into printing position adjacent to said opening.

3. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening, means for pressing a master sheet mounted on said drum through said opening in the form of a loop and into engagement with said roller, and means adapted upon each revolution oi said drum to give said roller a rotary movement for bringing a different portion of said master sheet into printing position adjacent to said opening.

4. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening, means adapted automatically upon to tary movement or the drum to press a master sheet mounted on the drum through said opening in the form of a loop and into engagement with said roller, and means adapted upon each revolution of the drum to give said roller a rctary movement for bringing a different portion of said master sheet into printing position adjacent to said opening.

5. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening, a second roller'movably mounted on said drum so as to move inwardly and outwardly through said opening adapted upon an inward movement to press a master sheet wrapped about the drum underneath said second roller through said opening in the form of a loop and into engagement with said first-named roller, and means adapted upon each revolution of the drum to givesaid first-named roller a. rotary movement for bringing a difierent portion of said master sheet into printing position adjacent to said opening.

6. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, grippers movably mounted on said drum adjacent to said opening, a roller rotatably mounted in said drum opposite to said opening, a second roll'er rotatably mounted on said drum so as to be movable toward and from said first-named roller through said opening, means adapted upon a rotary movement of the drum to close said grippers for securing one end of a master sheet in position on the drum, means adapted thereafter upon a continued rotary movement of the drum to move said second roller inwardly for pressing said master sheet through said opening in the form of a loop and into engagement with said first-named roller, and means adapted upon each revolution of the drum to give said first-named roller a rotary movement for bringing a different portion of said master sheet into printing position adjacent to said opening.

7. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, grippers movably mounted on said drum adjacent to said opening, a roller rotatably mounted in said drum opposite to said opening, a second roller rotatably mounted on said drum sons to be movable toward and from said first-named roller through said opening, means comprising a cam movably mounted adjacent to said drum so as to be moved into and out of operative position adapted upon rotary movement of the drum with the cam in operative position to cause said grippers to close for securing one end of a master sheet in position on the drum and adapted thereafter upon continued rotation of the drum to move said second roller inwardly for pressing said master sheet through said opening in the form of a loop and into engagement with said first-named roller, and means adapted upon each revolution of the drum to give said first-named roller a rotary movement for bringing a different portion of said master sheet into printing position adjacent to said opening.

8. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, grippers movably mounted on said drum adjacent to said opening, a roller rotatably mounted in said drum opposite to said opening, a second roller rotatably mounted on said drum so as to be movable toward and from said first-named roller through said opening, means comprising a cam movably mounted adjacent to said drum so as to be moved into and out of operative position adapted upon rotary movement of the drum with the cam in operative position to cause said grippers to close for securing one end of a master sheet in position on the drum and adapted thereafter upon continued rotation of the drum to move said second roller inwardly for pressing said master sheet through said opening in the form of a loop and into engagement with said first-named roller, and means comprising a second cam movably mounted adjacent to said drum so as to be moved into and out of operative position adapted'upon each revolution of the drum with the cam in operative position to give said first-named roller a rotary movement for bringing a different portion of said master sheet into printing position adjacent to said opening.

9. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance fromthe face of the drum, a second roller rotatably mounted in position adjacent to said firstnamed roller and movable into and out of pressure relationship to said first-named roller adapted in one position to permit insertion of a master sheet between the rollers and adapted in the other position to cooperate with said first-named roller for gripping the master sheet for moving it with respect to the drum, and means adapted upon each revolution of the drum to give said rollers rotary movement for bringing a different portion of such gripped master sheet into printin'g position adjacent to said opening.

10. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said firstnamed roller and movable radially through said opening in the wall of the drum into engagement with said first-named roller or alternatively into outwardly spaced relation to the face of the drum for permitting the positioning of a master sheet on the face of the drum between said two rollers,

, aaidoao said second roller being "adapted by aninward stroke with a. master sheet in position on the drum between the rollers to press the master sheet into the form of a loop into eflective engagement with said first-named roller, and means adapted upon each revolution of the drum to give said rollers rotary movement for bringing a different portion of said master sheet into printing position adjacent to said opening.

11. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said first-named roller and movable radiallyvthrough said opening in the wall of the drum into engagement with said first-named roller or alternatively into outwardly spaced relation to the face of the drum for permitting the positioning of a master sheet on the face of the drum between said two rollers, operating means movable into and out of operative position adapted when in operative position to cause said second roller to move outwardly beyond the face of the drum when the drum is rotated for permitting a master sheet to be positioned on the face of the drum over said opening in the wall and adapted then upon continued rotation of the drum to move said second roller inwardly for pressing said master sheet into the form of a loop and into effective engagement with said first-named roller. and means adapted upon each revolution of the drum to give said rollers rotary movement for bringing a different portion of said master sheet into printing position adjacent to said opening.

12. In a duplicating machine, the combination of a rotatably mounted drum having an open ing through its wall at one side thereof and extending substantially the full length of the drum, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum and extending substantially the full length of the drum, a second roller rotatably mounted in position adjacent to said first-named roller and extending substantially the full length of the drum .and movable into and out of pressure relationship to said first-named roller for permitting the insertion of a full-width master sheet between the rollers in position to be gripped by the rollers, and means adapted upon each revolution of the drum to give said rollers rotary movement for bringing .a different portion of such gripped master sheet into printing position adjacent to said opening. I 13. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said first-named roller and movable into and out of pressure relationship to said first-named roller adapted in one position to permit insertion of a master sheet between the rollers and adapted in the other position to cooperate with said firstnamed roller for gripping the master sheet for moving it with respect to the drum, means adapted upon eachrevolution of the drum to give said rollers rotary movement for bringing a different portion of said gripped master sheet into printing position adjacent to said opening, and means serving when said second roller is in presof a rotatably mounted drum having an opening through its wall along one side thereof. a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said firstnamed roller and movable radially through said opening in the wall of the drum into engagement with said first-named roller or alternatively into outwardly spaced relation to the face of the drum for permitting the positioning of a master sheet on the face of the drum between said two rollers, and a bar movable inwardly and outwardly with said second roller adapted when said second roller is in pressure relationship to said first-named roller substantially to close said opening in the wall of the drum flush with the adjacent face portions of the drum.

15. In a duplicating machine, the combinatio of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said first-named roller and movable into and out oil pressure relationship to said first-named roller adapted in one position to permit insertion of a master sheet between the rollers and adapted in the other position to cooperate with said firstnamed roller for gripping the master sheet for moving it with respect to'the drum, a platen roller rotatably mounted adjacent to the drum so as to press a copy sheet against the master sheet carried by the drum, means adapted upon each revolution of the drum to give said rollers rotary movement for bringing a different portion of such gripped master sheet into printing position adjacent to said opening in the drum, and guard plate means removably mounted on the drum in slightly spaced relation to said opening circumferentially of the drum so as to cover a portion of said master sheet for holding the copy sheet and the platen roller out of engagement with the master sheet at points beyond the normal printing position.

16. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said firstnamed roller and movable into and out of pressure relationship to said first-named roller adapted in one position to permit insertion of a master sheet between the rollers and adapted in the other position to cooperate with said firstnamed roller for gripping the master sheet for moving it with respect to the drum, a. platen roller rotatably mounted adjacent to the drum so as to press a copy sheet against the master sheet carried by the drum, means adapted upon each revolu ion of the drum to give said rollers rotary- L sheet at points beyond the normal printing position, and spring clips for holding said guard plate removably in position on the drum.

17. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite tosaid opening and spaced inwardly a short distance from the face of the drum, a second roller rotatabiy mounted in position adjacent to said firstnamed roller and movable into and out of pressure relationship to said first-named roller adapted in one position to permit insertion of a master sheet between the rollers and adapted in the other position to cooperate with said firstnamed roller for gripping the master sheet for moving it with respect to the drum, an arm pivotally mounted on said drum adapted upon an inward swinging movement to give said firstnamed roller a rotary movement for bringing a difl'erent portion or the gripped master sheet into printing position adjacent to said-opening in the drum, yielding means normally holding said arm against inward swinging movement, a cam movably mounted adjacent to said drum adapted when in operative position to cause said arm to swing inwardly upon each revolution of the drum for causing rotation of saidflrst-named roller, and means comprising a lever adapted in one position to hold said cam retracted from operative position and adapted in a changed position to hold said cam ir operative position for actuating said arm.

18. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatably mounted in said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said first-named roller and movable into and out of pressure relationship to said first-named roller adapted in one position to permit insertion of a master sheet between the rollers and adapted inthe other position to cooperate with said firstnamed roller for gripping the master sheet for moving it with respect to the drum, an arm pivotally mounted on said drum adapted upon an inward swinging movement to give said firstnamed roller a rotary movement for bringing a different portion of the gripped master sheet into printing position adjacent to said opening in the drum, yielding means normally holding said arm against inward swinging movement, a

cam movably mounted adjacent to said drum adapted when in operative position to cause said arm to swing inwardly upon each revolution of the drum for causing rotation of said first-named ,opening and spaced inwardly a short distance from the face of the drum, a second roller rotatably mounted in position adjacent to said firstnamed roller and movable into and out of pressure relationship to said first-named roller adapted in one position to permit insertion of 'a master sheet between the rollers and adapted in the other position to cooperat with said firstnamed roller for gripping the master sheet for moving it with respect to the drum, 9. short a in mounted to swing about the axis of said firstnamed roller, a gear fixedly connected with said roller, a pawl carried by said arm adapted upon an inward stroke of the arm to give said roller a rotary movement, a second arm swingingly mounted in position adapted by engagement with said first-named arm togive it an inward swinging movement, spring means normally holding said short arm swung outwardly to the limit of its motion, a cam movably mounted adjacent to said drum adapted in operative position to engage said second arm upon each revolution of the drum for causing rotation of said first-named roller, and means comprising a lever pivotally mounted adjacent to the drum adapted in one position to hold said cam retracted from operative position and adapted in a changed position to hold said cam in operative position for actuating said arm, said lever being held automatically in either of its said two positions.

20. In a duplicating machine, the combination of a rotatably mounted drum having an opening through its wall along one side thereof, a roller rotatabiy mountedin said drum opposite to said opening and spaced inwardly a short distance from the face of the drum, 9. second roller rotatably mounted in position adjacent to said firstnamed roller and movable into and out of pressure relationship to said first-named roller adapted in one position to permit insertion of a master sheet between the rollers and adapted in tion.

named roller for gripping the master sheet for moving it with respect to the drum, grippermeans carried by said drum for securing one end of said master sheet releasably in fixed position on the drum, means comprising a pivotally mounted cam adapted when in operative position to cause said grippers to open at a predetermined point in each revolution of the drum, an arm pivotally mounted on the drum adapted by an operative stroke to move said second roller into outwardly spaced relation to the face of thedrum, means comprising a second pivotally mounted cam adapted when in operative position to give said arm an operative stroke at a predetermined point in each revolution of the drum, and a lever for moving said cams in timed relation to each other adapted by a. stroke in one direction to cause said grippers first to close for holding a master sheet in position and thereafter to produce a movement of said arm for causing said second roller to move inwardly for pressing an intermediate portion of the master sheet into operative engagement with said firstnamed roller.

22.In a duplicating machine, the combination of a duplicating drum, means on said drum for securing a master sheet thereto with the sheet wrapped about the outer face of the drum, means carried by said drum engaging an intermediate portion of said master sheet and adapted to feed said intermediate portion into the interior of said drum while the end portions of the master sheet remain on the exterior of said drum, means responsive to rotation of the drum for actuating said feeding means in a step by step manner, and a roller for pressing copy sheets against said master sheet.

23. In a duplicating machine, the combination of a duplicating drum having a cylindrical surface, means on said drum for securing one end of a master sheet to said cylindrical surface with the sheet wrapped about the outer face of the drum, means carried by said drum and engaging said master sheet to feed it into the interior of said drum, and a roller for pressing copy sheets against said master sheet.

24. In a duplicating machine, the combination of a duplicating drum having a cylindrical surface for carrying a master sheet, a curved guard plate carried by the drum and disposed over said master sheet, said guard plate having an aperture therein exposing a portion of said master sheet, means carried by said drum and engage- 3Q able with said master sheet to advance a portion thereof in a step by step manner relative to said aperture, means responsive to rotation of the drum for actuating said advancing means, and a roller for pressing copy sheets against said master sheet.

25. In a duplicating machine, the combination of a drum having an opening at one side, a roller rotatably mounted inside of said drum adjacent to said opening, means engaging a master sheet wrapped about the outer face-of the drum for holding it in engagement with said roller so as to be advanced from a position outside of the drum into the drum upon rotation of the roller, and means for giving said roller a step by step rotary movement upon successive revolutions of the drum for bringing-different portions of said master sheet into printingposition on the face of the drum.

26. In a duplicating machine, the combination of a drum having an opening at one side, a roller rotatably mounted inside of said drum adjacent to said opening, means adapted by engagement with the outer face of a master sheet wrapped about the drum to move themaster sheet into engagement with said roller and to hold the master sheet in position against the roller so as to be advanced into the drum by rotation ofthe roller, and means for giving said roller a step by step rotary movement upon successive revolutions of the drum for bringing different portions of said master sheet into printing position on the face of the drum.

MAURICE R. AVERY.