US2536604A

US2536604A - Moistening device for duplicating machines

Info

Publication number: US2536604A
Application number: US610947A
Authority: US
Inventors: Jagger Hubert
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-08-17
Filing date: 1945-08-17
Publication date: 1951-01-02
Anticipated expiration: 1968-01-02

Description

Jan. 2, 1951 H. JAGGER MOISTENING DEVICE FOR DUPLICATING MACHINES Filed Aug.' 17, 1945 Flllllllllll 4 Sheets-Sheet 1 IN VEN TOR. I

H. JAGGER MOISTENING DEVICE FOR DUPLICATING MACHINES Jan. 2, 1951 4 Sheets-Sheet 2 Filed Aug. 17, 1945 Jfuberi K752391921 BY Jan. 2, 1951 Filed Aug. 17, 1945 H. JAGGER MOISTENING DEVICE FOR DUPLICATING MACHINES 4 Sheets-Sheet 5 Jan. 2, 1951 H. JAGGER v MOISTENING DEVICE FOR DUPLICATING MACHINES Filed Aug. 17, 1945 4 Sheets-Sheet 4 Zia-11 IIIIIIIIIIIIII/IIIIIIIIIIIIIIIIL IN V EN TOR.

Jizgger /JM A 19w Patented Jan. 2, 1951 UNITED STATES PATENT OF FICE;

smorszronme DEVICE FonnnPn-Icammd MACHINES;

Hulierit'lagget MayWood, III. Application August L7, 1945 Serial-No. 10,341

' invention relates. :to, improvements. in duplicating machines.

one object; of. the invention :is to provide a liquid type-duplicating.machmehaving improved means for supplying; liquid .fronra source thereof for. .app' ication to com sheets-as thelatter move into-contact with an original or master sheet.

, Another objector the invention is to provide 1 amimproved duplicator comprising a .liquid pump and: liquid distributor mechanism which, uponactnation during. use of. the machine, elevates liquid lf-l-OIIL .a tanker reservoir and, effects dis tribution ofthe-sameato theasurfaceioi a. moistening roll forapplicationtherebyto copy sheets.

a A further object oif'the invention is to provideimproved means for'ractuatinga pumpaof a, liquid I an improved clamp bar for a. rotary drum. .of aduplicating machine. providing meansqwhereby twosheets may be retained: on the drum during operation thereof; required such as a. master sheet and-a blockeout sheet for example.

An additional object of the invention. isto provide means for latchinga rotary drum ofa duplicator in position..for retaining one edge or they other of a. .clam-ping .barwinregistration with a sheet guide ion convenience in inserting a. master sheet or a block-out sheetonthelike. into. operative. positionon. the. drum.

Other .objectsof .the invention-relate to various: ieatures of construction and. arrangementof. parts which will-be apparent from aconsidera-tion of the. following .specificationrhnd accompanying.

drawings wherein.

.-.Eig..i1.is. aside elevationof a-liquid type .duplircatingmachinewh-ichis i-llustrativeof ithepresent invention.

Fig. 2 isan enlarged. sectional view taken. on line .2.-'2' of Fig. .1 v

Fig. 3' is a sectional view taken online its-#3. :of. Big. .6..

Fig. .4 .iisafbroken sectional view .takenonili-ne 4-'-4' of jEi'g. .3;

Fig- '5 is a sectional view taken .on .line 5-5 of Fig. "6 is .a sectional View taken on line .6-'G o'f'Eig. 2.

Tiis ian enlfl fgicd'hmken sohflonal view *a ver'tical plane'long'itudinally of the oasingilius- 21' trating. thedrum v.-in lock.ed posltionand with clamp bar elevated. .for receiving. a master, can

Big. 8. isa similar. view showingthe with. the alampbar elevated;IQnreoeiYinga blocleoutz sheet. in. clamping nosition.

Eig. $9,.anc1flareed sectional view takcneon; line. 9-9 of Fig. 1,.

Fig. 10 is an enlau'eerl.sectionalv view taken oz line. Ill-40. of, .Fig. .1.

Fig. .11 isan enlarged sectional. View taken-9n; line. l.l.lj.l .of..Eig...1-. 1'

Fig. 12 is .an. enlarged broken sectional. taken .onhline.. l-2=-.lg.rof.Eig. 1:0. 1

In. the drawings, the. duplicating machine, therein shown. for thepurposes of: illustration comprises. aopair of side frame members 10 and; H which are retained together inaspaced apart; relation. and within. which .is iournalled. a; shaft [2. .upon which a rotary drum I3. is mounted for rotation y ny suitable means.. For the sake. oi simplicity the drum: of the drawings is shownas being rotatable by means of" a hand crank; although it will beapparent that suitable. PQ T driving mechanism may beutilized; when desired- The. drum 13 has. acylindrical workingurface which isprovidedwithan inwardly disposedwor reentrant portion. 1 5... Adiacentthe trailing-edge of. the. portion t5 the. drum is provided, in .the outer cylindrical surface thereof, witha..lQ 1 i-. tudinal recess. .for receiving a clampv bar L6; b neath either edgeof, which may be clamped-a sheet-which is .tooverlie :a portion of the surface of the drum during-the. operation of the machine; The clamp bar I6 is adjustably retained inits. seat. in. the surface of the. drum by means -;of springs. 11 (see Eis- 2')" which aresecured at one; end oteach to a.-.,stud 1:8. and at-the other end-1 h arod [9. The springs; are underasuitable tension; and hence. while; they tend to r tainv the clam bar with. the. outer surface.- ther of disp ed conformit with the. outer oyl ndricalsuriace therdrum, permit-the .clamp- *bar to be -.rocked-.or

tilted ioutwardlvat either edge, the oppositeoedge serving as theiulcrumier the tilting; movement.

In Fig. 6 of the-drawin s:,a..master sheet 2-0 is. shown lying incontact witha portion of mercylindricaisurfaceoi vthetdrum; The forwarded -Q oithesheet .20 as indicated at 2:] is disposed he. tweenthe adjacent-edge of. the clamp ar .l i and; the adjacent, wall, .of the clamp bar receiving recess. .F'or the purposeof facilitating the insertion of a sheet under either edge of .theclamp bar two clamp. .bar operating, memb rs are. movide These .membersiare inthe ,iorm of U. -.shaped rle aone .desienatedgbv numeral. 22 anclgtheether by numeral-23. The outer ends of the U-shaped levers are available for manual operation through a recess 24 provided in the reentrant portion i 5 of the drum surface as shown in Fig. 6. The levers are pivoted upon a pin carried by suitable lugs 25a on the inner surface of the drum. Lever 22 has a forward end 2411 disposed adjacent the trailing edge of the clamp bar It whereby inward depression of the opposite end of the lever will tilt the trailing edge of the clamp bar outwardly about the forward edge of the clamp bar as a fulcrum. While the clamp bar is in such outwardly tilted position, a master sheet, such as sheet 2|], may conveniently be removed from engaged position or a different master may readily be inserted. Similar operation of lever 23 will cause the end 23a thereof to swing the forward or advancing edge of clamp bar [6 outwardly whereby a sheet may be inserted in position for engagement by such forward edge and without releasing a master sheet previously positioned on the drum. The clamping facility of the forward edge of the clamp bar generally is utilized for clamping a sheet to the drum which is arranged to extend clockwise from the engaged end for overlying a portion of a master sheet and may be provided with cut-outs which permit reproduction of a portion only of the written, typed or printed material that appears on the master.

For convenience in inserting a master sheet or a block-out sheet in position upon the drum i 8 a stop means comprising a spring actuated plunger 26 is provided in the frame member I! (see ,Fig. 3) The plunger 26 is provided with'a finger grip 21 at its outer end and extends through a boss 28 provided on the outer surface of the casing member II. The end of the boss 28 is provided with

notches

29 and 29a each for receiving a pin 36 carried by the plunger. The notch 29 as viewed in Fig. 3 is deeper than the notch 29a and when the pin is disposed in the deeper of the two notches, a spring 3| forces the inner end of the plunger inwardly the maximum extent, whereas if the plunger is turned while in fully retracted position for causing the pin 30 to engage the shallower notch 29a, which is disposed at right angles e to notch 29, the inner end of the plunger will be retained in an inward or inoperative position. The inner end of the plunger, indicated by the numeral 32, as shown in Fig. 4, is substantially oi oval shape in cross section or end view. When the end 32 is in the position shown in Fig. 3 it is adapted to cooperate with a notch 33 or a notch carried by a cross head or plate 35 which is secured to'the clamp bar It.

In Fig. 3 the end 32 of the plunger is shown in latching relation within the notch 33 of the head 35 and hence will retain the drum I3 against rotation. While in such latched relation, the trailing edge of the clamp bar I6 may be swung outwardly by the inward depression of the end of the lever 32 that is accessible for operation within the recess 24 of the drum. The oval shape of the latching end 32 of the plunger avoids binding within the notch 33 during the outward swinging of the clamp bar as above described.

Manual wtihdrawal of the plunger 26 effects release of the end 32 and by rotation through an arc of 90 degrees, the cross pin 33 can be caused to seat in the shallower of the two notches 29a for retaining the end 32 in a non-obstructing relation with reference to the head 35 during rotation of the drum.

Secured to the frame members of the machine is a sheet guide 36 as shown in Fig. 6 which as shown in Fig. 7 is adapted to assist in guiding 4 a master sheet 20 into position for engagement by the clamp bar when the latter has been swung outwardly as described.

When the drum has been adjusted for engagement of the latch 32 of the plunger within recess 34, the other longitudinal edge of the clamp bar will be in registration with the sheet guide 35 as shown in Fig. 8 for facilitating the insertion of a sheet into clamping relation with reference to the other edge of the clamp bar [6 when lever 23 has been depressed.

For cooperation with the drum 13, there is provided a platen roll 31 which is rotatably journalled at its ends in a bearing-support 33 which in turn is pivotally mounted at its center upon a shaft 38 as shown in Figs. 2 and 6. The shaft 33 extends through a bar 40 which at its ends is pivotally mounted on studs 41 which are supported by the respective frame members I9 and H. The bar 4%] thus constitutes a pivotal axis about which the shaft 39 may be rocked slightly in a vertical plane as viewed in Fig. 6. The right end of the shaft 39, as viewed in Fig. 6, is provided with a bracket 42 through which extends a rotatable shaft 43. The shaft 43 is supported at the inner end in a bracket 44 and at the opposite end in the frame member ID. The intermediate portion of the shaft 43 is eccentric with reference to the journalled end portions and hence rotation of the shaft in one direction or the other produces a rocking movement of the arm 39 and hence the raising or lowering of the platen 3'! whereby the latter can be adjusted for exerting proper pressure against the cylindrical surface of the drum i3 as shown in Fig. 1. The outer end of the shaft 43 is provided with an operating knob or handle 45 which may be provided with graduations for indicating positions of the adjustment thereof as disclosed in my co-pending application, Serial Number 605,659, filed July 18, 1945, for Duplicating Machines.

A moistener roll 43 is provided for applying liquid to copy sheets and for cooperation with the platen in feedingthe same into position for engagement by the coaction of the cylindrical surface of the drum with the surface of the platen roll 3?. The roll 46 is journalled in the end walls of a tank structure, indicated generally by the numeral 48, as shown in Fig. 10. The tank 48 is disposed between the end walls I!) and II and is retained in horizontal relation by means of Iongitudinal ribs 49 provided on the end walls of the tank which slide within correspondingly shaped channels 50 provided in the frame members in and H (see Fig. 11).

The tank can be moved horizontally for adjusting the moistening roll 46 with reference to the platen roll 3? and is retained in the adjusted position by means of nuts 5| carried on the outwardly extending ends of studs 52 which at their inner ends are secured to the end walls of tank 48 and which studs are slidable within recess 54 provided in the wal s of the frame members l0 and H. By tightening the nuts 5| the tank 48 may be retained in the horizontally adjusted position wherein proper driving contact between the roll 45 and the platen 3'! is afforded.-

The tank 48 is provided with a forward vertical wall 55 (see Fig. 6) which at its upper edge terminates in a forwardlyextending lip 56. Adjacent the wall 55 is a swingable or oscillatable piston 5'! which is pivotally supported by. pins 58 disposed on the lower end walls of slots 48a provided in the side walls of the tank. Secured to the upper end of the piston 51 is an arm 59 which cairriesz'arollenfiniataiisupper ;end.- Hherollen-BB thespringsMior urging the pistonforwardly-or ma clockwise direction :as viewed in Fig. B th-at is, in .av .direction .ior causing the desired con-tact ct .roller .69 with .the .studs. .6 during rota-- tion .of the .drum. It will be .seen as viewed ii that as the drum. .13 .isrotated counterclockwise the piston .51 will bewmoved .rearwardly "or. counter-clockwise .a-s thepins-EJ- in succession engage .the..1'oller .Eilim .Hence the .pistonfil vis actuated counter-clockwise as viewed vinliig. .6 by the. vcoactionof .rollerfiil. and pins iil and is moved inthe. opposite. direction or clockwise by .the springs 62.

.Means are provided for supplying liquid tothe tank 48,. the liquid usually being .an. aqueousalcohol solution- The means for Supplying the liquid to the tank and maintaining the liquid .ata. constantlevel. within the maybe a reserroam the .icrmxof bottle mounted. upon a. member. .631). (see Fig. .9.) preferably provided with v apelt. cock film... Liquid. from the reservoir whenlthe. pet cock isopen, flows. through ,a tube 6.5. into the tank and continuesto .flowsolong asthe innerend of the tubefE E3. is uncoveredby the-liquid within the tank. The operation of such Iced.- ing dovicesis well-known. .An overflow-duct .61 .is provided (see Fig. 1) for carrying surplus liquid. into an overflow tank. 58, should .for any reason the. liquid feeding apparatus ,notiunction asintended. .Theliquid in. tanl: laisthus maintained. at a constantil'evel.

.ILiquid'. within the tank flows.- around the ends of the piston and beneath the. same intothe. space 6 agconstituting a. pump chamber betweenthe pistonifi] and theadjacenitiace of the end wall 55. Oscillation cf the piston 51 about .its pivot .58: forcessome of theliquid within. thespace .69 upwardly through anoutlet =7 3 which is providedbe tweentheupper longitudinal edge of the wall- 55 andanadiacent longitudinal edge .1 lof the-piston. .Each clockwise stroke of the piston as view-- ed .i'nEia. 6 .iorces liquid upwardly through the outlet .lil. against. the surface of. the .msistening- The. outlet is. coextensive with the length-of the roll 4.6 and the latter is closely spaced from the edge of the lipiB whereby, at. each working. stroke of the piston, the moistener roll is supplied. with liquid throughout its. length without loss .or appreciable loss of liquid downwardly from the lip-brat the endsof the lip .due to .the forwardly extending portions-of. the side Walls of the tank as illustrated. piston .51 is provided. with a pair of .setscrews. 12 for limit ing (the forwarder power stroke or the piston under the. action. of the spring. .sZand .hence. the. quantity of'liquid thatis delivered to the outlet If! on'jeach'stroke. oi. the piston. canbe controlled. whereby sullicientll'i uid. will'be. delivered to the outlet 1| by the rapidly operating p stonto eflect the uniform wetting of the roll while avoiding floodingo'f the roll as wellas intermittentapplication oi liquid to therollonly- As the. drum .[3' is rotated counter-clockwise, as. viewed" in'Fig fig it effects rotation of the I platen;

3.! :dllrlngzthe portion of :each :m'tativecydlezof drum that the cylindrical surface thereoi'iis vtin.- engagement withithe surfacezzofthe platen. 'iThe reentrantpzportion 155 or the drum surfacetefiects nodrivi'ng 'tof the'iplaten '31. Themoistenerroll'kfi: is in :turn ,driven. by contact with the platen As the drum is rotated counter-clockwise, the platen will rotate clockwise .and the moistenen' roll 16 will be operated counter-clockwise. rotation of the drum brings successive pins. .81: into contact with the-pump actuating roller 16.0 and thus delivers .-:liquid .to the :outlet H "where: it. is picked .up by the'roliifi anclisrappliedto the adjacent surface of copy sheets [2 asthexsame pass in succession upwardly between the platen. 31 and roll scrum engageinenthetwcenitheplaten contacting surface portion f the drum .As a copy sheet "l2 .is fed upwardly between the platen .3 1 and roll cc, either manually =0Jf'lhy automaticffeeding means, it is gripped by the: cooperation of the platen and moistening roll and advanced upwardly into position for engagement by the platen and the drumand is pressed" by. cooperation 'of the platen and :the drum into contact with a master 2i on the drum. Asthei copy sheet passes between the platen "and the drum the moistened surface of the :copy sheet contactsrthe master sheet and receives .anli'mpressi'on of theiwritten or printed matter thereon; the :matter being in copyable or ihectograph ink; Eachrcopy sheet as it passesoverthepllatendrops intoa receiving'tray l3. I

It is desirable that the period of operation "of the 'pump during the passage of each copysheet through the machine he correlated with respect to the length of the copy sheet so that-liquid from the tank 43 will not be applied needlessly to the moisten'er roll 46 except assuchmois'ture will be transierre'dito a copy sheet. For the purpose of correlating the operation of the pump to the length of copy sheets to be used, a flexible tape M is provided upon a holder or spool 15 carried. upcnthe end the of the drum. Thespool T. '55 may be of the typesuchas 'isused for roll-upmeasuring tapes whereby the tape M may be pulled from the spool against theztake-up action; of a spring. .As shown in Fig. 6 the outer-end portic-ncf the tape lies along the peripheries of; a number of adjacent pins 6|. The. :outer end of the tape is provided with a hook 16 which is adapted to engage over one of the pins. Viewing Fig. 6,11, will beseen that as the drumis rotated counter-clockwise from the position shown insald:

figure, the pins uncovered by the tape: 1.4- will: effect actuation of the pump but when the-ads,

vancing end of the tape it contacts the roller (iii,- the pumping action will cease due to the :fact that :the arcuate' tape section Ida aliordsa track:

along which .therolier 65. will rclL-thus interrupting the action of the pump. By extending: the tape '14 over the requisite number of=pins iri. it is possible readily to effect interrupti'onuof the action 'of the pump as desire and thereby avoid needless. applicatiomof. liquid to t11e-;mo1&-=

tenor roll 46..

In the. event that the machine is .lettinactive for a'period of time or until the liquid hasevaporated from the surface" of" the -.moistener sol-l 45, it is desirable that the roll be pro-moistened tion of the tape 14a will be in contact with roller 60 holding the same outwardly. As the drum is rotated from that assumed position an end pin indicated by the numeral 6la will engage the roller 50 after the arcuate portion of the tape has passed from contact with the roller 60 and will efiect a pumping action during the short interval that the cylindrical surface of the drum, corresponding to the distance between pin Gib and the adjacent edge of the reentrant portion I5, is driving the platen 31. The length of the arcuate portion just mentioned, that is approximately from pin 6 lb to the leading edge of the re-entrant portion marked la, is substantially equal to onehalf the circumference of the roll 46. Hence in starting the machine with the roll 46 dry, moisture will be applied to one-half of the surface of roll 46 as viewed in Fig. 6 and thus liquid is carried up into the bight between the roll 46 and platen 31 whereby the upper portion of the first copy sheet 12 of the assumed fresh batch of copy sheets will receive liquid from the machine. The sheets are fed into the machine .during that portion of the rotation of the drum when the reentrant portion IE is in registration with the platen 31, that is, during the portion of each rotation when the platen is inactive.

. It will be seen that by extending the tap 14 over a greater number of pins 6i than those shown in Fig. 6, or a lesser number, the period of operation of the pump during each ro-tative cycle of the drum can be controlled whereby liquid can be applied to short copy sheets or long copy sheets as desired. In some instances where long copy sheets are used, it may be desirable to moisten only a portion of the same in which case desired pump action can be obtained by the proper adjustment of the tape with respect to the pin 6 I.

While I have shown and described a structure that is illustrative of my improvements it will be apparent that variations of the structure may be utilized within the spirit of the invention.

' I claim: 1. In a duplicating machine, a rotary mastercarrying drum, a rotary platen cooperating with said drum for pressing copy sheets against a master sheet on the drum, a moistener roll operable by said platen, a liquid-holding tank having an end wall terminating in a discharge lip at the upper edge thereof and disposed in close proximity to the periphery of said roll, an operable pump member mounted within said tank for cooperation with said end Wall for effecting the discharge of liquid from said tank over said lip into contact with said roll during each working stroke of said pump, the pump operating member extending from the pump to a position adjacent the periphery of the drum, and means comprising a series of spaced members on the drum positioned for cooperative engagement with and adapted successively to engage said operating member as the drum rotates for efiecting actuation of said pump.

2. In a liquid type duplicating machine, a rotary drum provided with an arcuate row of pump actuating members, a sheet moistener member located adjacent a wall of a liquid holding tank and adapted to apply liquid to copy sheets as the same are moved into copying relation within the machine, a liquid-holding tank, an operable pump member in the tank arranged for cooperation with said wall thereof for effecting the discharge of liquid from the tank to said sheet moistener member, and a' pump operating arm carried by said pump member and biased for movement into the path of said pump actuating members for actuation successively thereby for eifecting operation of said pump member.

3. In a duplicating machine, a rotary drum provided with a plurality of arcuately arranged pump actuating members, a sheet moistener member adapted to apply liquid to copy sheets as the same are moved into copying relation within the machine, a liquid-holding tank having a wall provided with a liquid discharge lip coextensive in length with the length of said moistener member, an operable pump member mounted in said tank adjacent said wall for cooperation therewith in effecting the discharge of liquid from the tank over said lip and upon said moistener member, and means comprising an operating arm projecting from said pump memher into the path of movement of said pump actuating members for actuation successively by said actuating members for effecting operation of said pump member.

4. In a duplicating machine, copying means comprising a rotary drum. a sheet moistener comprising a roller adapted to apply liquid to copy sheets as the same are moved into copying relation within the machine, a liquid-holding tank provided with a liquid discharge lip disposed closely adjacent the periphery of said roller, a, pump arranged to transfer successive charges of liquid from the tank over said lip to said moistener, an actuator extending from the pump adjacent the outer periphery of said drum, and means comprising a plurality of members spaced circumferentially on said drum and arranged for movement in a path for successively contacting said pump actuator during the rotation of the drum for efiecting the operation of the pump.

5. In a duplicating machine, copying means comprising a rotary drum, a sheet moistener comprising a roller adapted to apply liquid to copy sheets as the same move into copying relation within the machine, a liquid-holding tank provided with a wall terminating in an outwardly directed lip closely adjacent the periphery of said roller, a pump comprising an oscillatable blade arranged for cooperation with said wall of said tank for delivering successive charges of liquid from the tank over said lip to said moistener, means biasing said blade for op eration in one direction, said blade being provided with an operating arm, and means comprising a plurality of arcuately disposed members on said drum extending into co-acting relationship with said arm for efiecting successive strokes of said blade in opposition to the action of said biasing means.

6. In a duplicating machine, means for impressing successive copy sheets against a master sheet compris ng a rotary drum, a moistener arranged to apply liquid to said copy sheets as the same are moved into copying relation during successive rotations of the drum, liquid-holding means, a pump comprising an oscillatable member for delivering liquid from said holding means to said moistener, said pump member being provided with an operating arm, means for operating said pump comprising an arcuate row of spaced members carried by said drum in a rotary path for engaging successively said arm for operating the same during rotation of the drum, and adjustable means for retaining said arm out of operating engagement with selected spaced members of said row to render said members inefiectual for operating said pump for correlating the duration of operation of the pump to the length of the copy sheets ,during each rotation of the drum.

'7. In a duplicating machine, mean for impressing successive copy sheets against a master sheet comprising a rotary drum, a moistener arranged to apply liquid to said copy sheets as the same are moved into copying relation during successive rotations of the drum, liquidholding means, a pump comprising a reciprocable member for delivering liquid from said holding means to said moistener, said member being provided with an operating arm, means for operating said pump comprising an arcuate row of spaced members carried by said drum and projecting into positions for operatively engagin said arm during rotation of the drum, and adjustable means comprising a flexible member adapted to be positioned over a selected group of said spaced members for retaining the arm out of contact with said selected spaced members for rendering the same ineffectual for operating said pump for correlating the duration of operation of the pump to the length of the copy sheets during each rotation of the drum.

8. In a duplicating machine, means for impressing successive copy sheets against a master sheet comprising a rotary drum, a moistener arranged to apply liquid to said copy sheets as the same are moved into copying relation during successive rotations of the drum, liquidholding means, a pump for deliverin liquid from said holding means to said moistener, said pump being provided With an actuating member, means for operating said pump comprising an arcuate row of spaced members carried by said drum in a rotary path for successive engagement with said pump actuating member, and adjustable means comprising an extensible member adapted to be disposed over a portion of said row of spaced members for holding said actuating member out of engagement with selected spaced members of said row for rendering the same ineffectual for operatin said pump for correlating the duration of operation of the pump to the length of the copy sheets during each rotation of the drum.

9. In a duplicating machine, means for impressing successive copy sheets against a master sheet comprising a rotary drum, a moistener arranged to apply liquid to said copy sheets as the same are moved into copying relation during successive rotations of the drum, liquid-holding means, a pump for delivering liquid from said holding means to said moistener, said pump being provided with an oscillatable actuating arm, means for operating said pump comprising an arcuate row of spaced members carried by said drum and projecting into positions for successively engaging said arm for actuating the same during rotation of the drum, and adjustable means comprising an extensible member carried by said drum and adapted to provide an arcuate track closing the spaces between selected adjacent spaced members for retaining said arm out of contact with said selected members for rendering said selected members inefiectual for operating said pump for correlating the duration of operation of the pump to the length of the copy sheets during each rotation of the drum.

HUBERT JAGGER.

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

UNITED STATES PATENTS Number Name Date 1,928,233 Simonsen Sept. 26, 1933 2,012,619 Ritzerfeld Aug. 27, 1935 2,129,179 Kokay Sept. 6, 1938 2,135,824 Marchev Nov. 8, 1938 2,161,554 Benello June 6, 1939 2,161,795 Benello June 13, 1939 2,189,765 Takats Feb. 13, 1940 2,220,265 Morrison Nov. 5, 1940 2,231,291 Morrison Feb. 11, 1941 2,380,744 Ford July 21,1945 2,374,039 Rockhill Apr. 17, 1945 FOREIGN PATENTS Number Country Date 367,775 Italy Feb. 2, 1939