US2936706A

US2936706A - Roll tensioning means for duplicating machines

Info

Publication number: US2936706A
Application number: US660546A
Authority: US
Inventors: Edward M Springer; Francis K Moore
Original assignee: Heyer Inc
Current assignee: Heyer Inc
Priority date: 1954-04-01
Filing date: 1957-05-21
Publication date: 1960-05-17
Anticipated expiration: 1977-05-17

Description

May 17, 1960 E. M. SPRINGER ETAL 2,936,706

mu. wsusxonmc MEANS FOR numcmmc MACHINES Original Filed April 1, 1954 10 Sheets-Sheet 1 1 0 FRANCE: K. MOORE EDWARD Mfipmueae y 1960 E. M. SPRINGER ETAL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1, 1954 10 Sheets-Sheet 2 I I I H.

L: a} I m fi /$9 S W i jaws r170 FRANClS K. MOORE EDWARD M. SPRINGER HMB-v BMW May 17, 1960 E. M. SPRINGER ETAL 2,936,706

ROLL 'rmxsxoumc MEANS FOR DUPLICATING MACHINES Original Filed April 1, 1954 10 Sheets-Sheet 3 138 15! Wllufi w jwu'rzfi- FRANCIS K. MOORE EDWARD M. SPRmeER a Hm, DMwfB muw we 'B/w u) m?" May 1960 E. M SPRINGER ET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1, 1954 1o Sheets-Shet .4

JZVZV-lfi] FRANCIS K. MOORE M EDWARD M. SPRINGER E Hm, O

y 1950 E. M. SPRINGER ET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1, 1954 10 Sheets-Sheet 5 fizz/276752; FRANCIS K. MOORE EDWARD M. SPmNGER i? 4am, MGM

M BMWJ awe y 1960 E. M. SPRINGER ETAL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1, 1954 10 Sheets-Sheet 6 jzvevzfiv FRANCIS K. MooRE EDWARD M. SPRINGER y 1960 E. M. SPRINGER ETAL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES l0 Sheets-Sheet 7 Original Filed April 1, 1954 jzueqzin FRANcvs K. MOORE EDWARD M. SPRINGER y 1960 E. M. SPRINGER ET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1, 1954 10 Sheets-Sheet 8 m i fi mw %R N M W ma? 3 u W. 4 2

y 1960 E. M. SPRINGER ETAL 2,936,706

ROLL 'rsusroumc MEANS FOR DUPLICATING MACHINES Original Filed April 1, 1954 I 10 Sheets-Sheet 9 45 flxzaez/zzn .51 ERANus K. MOORE DWARD M. SPRINGER Hami -Bylaw May 17, 1960 E; M. SPRINGQER'YET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES lOSheets-Sheet 10 Original Filed April 1, 1954 k W. w

I 9) III! *3 az /27th FRANCIS K. MOORE EDWARD M.SPR|NGER awa United V States Patent ice ROLL TENSIONING MEAN S FOR DUPLICATING i MACHINES Original application April 1, 1954, SerialNo. 420,232,

now Patent No. 2,830,534, dated April 15, 1958. Dividetl and this application May 21, 1957, Serial-No. 660,546

6 Claims. (Cl. 101-132.-5)

This application is a division of our copending'applieation Serial No. 420,232, filed April 1, 1954, for Duplicating Machine, now US. Patent No. 2,830,534.

The present invention relates to roll tensioning means for duplicating machines.

An object of the invention is to provide a duplicating machine comprising a rotatable master carrying drum and an impression roll cooperating with the drum in pressing copy sheets against the master and means for varying the pressure exerted by the roll in pressing copy sheets against the master during a period of operation of the machine. Thus as the imprinted material on the copy sheets be comes less intense or fainter after a period of use of the master, the pressure of the impression roll against the drum can be increased from time to time by the operator for maintaining substantialuniformity in the intensity of the duplicated matter upon the copy sheets. By-using less pressure between the roll and master when the latter is fresh and increasing the pressure from time to time as the printing of a large number of copies progresses, substantial uniformity in the intensity of the imprinted matter through the entire run can be obtained. T he pressure iant lowered position illustrated, isopen to supply fluid to a transverse fluid holding tank;

Fig. 10 is a broken elevational view of the fluid discharge end portion of the tank and of the control valve;

Fig. 11 is a broken elevational view of the control valve 7 shown in longitudinal sectionin elevated, closed position;

Fig. 12 is a broken transverse sectional elevation taken on line 1212 of Fig. 2 and showing a copy sheet being advanced'from the feed table into the bight of a moistening and cooperating presser roll;

Fig. 13 is a broken transverse vertical sectional view taken axially of the drum and drive shaft.

7 Fig. 14 is a vertical elevational view of the left-hand end of the drum as viewed in Fig. 2 and manually operable means mounted on the adjacent side frame member for effecting elevation of the master clamp carried by the drum;

:Fig. 15 is a broken end elevational view of the hub structure of the crank including manually operable adjusting means for adjusting the drum relative to the shaft and crank for varying the position at which the master,

'carried by the drum, contacts the copy sheets whereby the location or calibration of the imprinted matter upon the sheets can be varied longitudinally of the sheets;

Fig. 16 is a detached broken perspective view of the crank hub as viewed from the inner face thereof.

Fig. 17 is a broken sectional view taken on line 17-17 of Fig. 13;

Fig. 18 is a broken elevational view of a portion of the driving mechanism shown in Fig. 4 but in a relatively different operating position;

varying means can be operatively disconnected readily'to release the pressure of the impression roller againstthe. drum and to release'the pressure of a presser roller against a moistening roller also to avoid a tendency of the rolls to become flattened when the machineis to remain idle for a period, as overnight or weekends,

Other objects of the invention relate to various features of construction and arrangement of parts which will be apparent from a consideration of the following specification and accompanying drawings wherein,

.Figure 1 is a perspective view of a machine which is illustrative of the present invention, the figure showing side ornamental plates or housings which enclose certain operative parts of the mechanism; I

Fig. 2 is a broken elevational view of the machine shown in Fig. 1; I

Fig. 3 is a broken verticalsectional view taken on line 33 of Fig. 2; I

Fig. 4 is a side elevational view of thedriving and timing mechanism for the driven rolls viewed along line44 of Fig. 2, but with the respective ornamental cover or housing plate removed;

Fig." 5 is a sectional elevational view taken along the line 5-5 of Fig. 2, the cover plate being not shown;

Fig. 6 is a broken sectional view of an eccentric cable tensioning structure taken on line 6--6 of Figs. 3 and 7;

Fig. 7 is a broken elevational view of the eccentric structure shown in Fig. 6;

Fig. 8 is a perspective view of a detached spring collar which in use embraces the convolutions of the cable on the eccentric as shown in Figs. 6 and 7;

Fig. 9 is a broken end elevational view of a rockable fluid supply tank and a sectional view of anassociated automatically operable control valve which when in the Fig. 19, taken on line 19--19 of Fig. 20, is an axial sectional view of one of. the two one-way. clutches shown in r Fig. 4 which is operative only when driven in one direction and permits the driven elements to continue rotation in that direction independently of the clutch;

Fig. 20 is a sectional view of a clutch member taken along line 2020 of Fig. 19;

Fig. 21 is a longitudinal sectional view similar to Fig. 9, but illustrating a modified means for selectively adjusting the tank between several operative positions for varying the level of the liquid in the Wick-moistening trough and thus varying the quantity of fluid applied to the copy sheets; and

I Fig. 22 is a broken top plan view means shownin Fig. 21.

Themachine shown in the drawings is of the hand operable type having a crank 10for rotating a drum 11 which is journalled in theopposed side frame members or plates of the tank adjusting 12 and 13, which are connected by transverse tie rods and other elements for giving rigidity to the structure but which,-not being specifically relevant to the invention hereinafter claimed, are not described in detail. The ma chine as shown in Figs. 1 and 2 has ornamental side case ing members 12a and 13a which cover mechanism mounted on the outer surfaces of the

frame members

12 and 13 respectively. The members 12a, 13a need not be I further described nor illustrated.

At one end of the machine is a feed table 14 for holding a supply of copy sheets which are fed automatically, in'succession into the machine as it is operated, the rate of feed being one sheet to each cycle of operation of the drum. At the other end of the machine is a receiving tray 15 for receiving the imprinted sheets issuing from the machine. The drum 11 is provided with a clamp Patented May 17, 1960 forward feeding of the top-most sheet of the stack of copy sheets 17 on the feed table 14 until the advancing end of the sheet is pressed into the bight of a pair of contacting upper and lower rolls 18 and 19, which at that v instant are stationary. Rolls '18 and 19 are respectively a moistening roll and a presser roll. The feeding of the sheets in succession from the stack is effected by feed means shown as comprising a pair of rubber feed wheels 2%) on a shaft 21 which is driven positively at the beginning of a cycle of operation of the crank 10 from a starting or initial position to advance the top sheet until the forward end is firmly fed into the bight of the rolls 18 and 19, whereupon the feed wheels 20 become inactive or non-driven by the mechanism but can free-wheel in the same rotative direction'as the sheet is advanced by the rolls 18 and 19. Following the interruption in positive feed of the feed Wheels 20 and shaft,

21 the rolls 18 and l9become positively driven during the succeeding portion of the same cycle of operation of the drum and advance the sheet between said rolls and into the bight between the drum 11 and a subjacent contacting impression roll 22. The roll 18 applies moisture to the upper surface of the sheet as it advances between the rolls 18 and 19. As the forward end of the sheet passes into initial engagement between the rotating drum 11 and impression roll 22, the rolls 18 and 19 are de-clutched from the drive mechanism as later explained but are rotatable in the same direction by the remainder of the sheet being drawn forwardly by reason of the engagement thereof by the drum and impression roll. Hence moisture is applied to the sheets as they pass in contact with roll 18 but as a, sheet has passed out of engagement of the rolls 18 and 19, their rotation halts until positively driven during the corresponding portion of the next cycle. The interruption of the operation of the rolls 18 and 19, as stated, avoids the needless and disadvantageous application of fluid by the moistener roll 18 to the subjacent roll 19 and thus not only conserves the fluid supply, but avoids the application of fluid to roll 19 and by the latter to the rear surface of the sheets passing between said rolls.

From the foregoing brief general description of operation of the machine it will be seen that at the beginning of an imprinting operation, the drum 11 is rotated as by the crank 10 or by power means if desired, and that during the first portion of a complete rotation of the drum, the feed wheels20 on shaft 21 are positively driven to feed forwardly the top sheet of a stack 17 of copy sheets to a position where the forward end of the copy sheet is within the bight of the moistener and presser rolls 18 and 19 as indicated in Fig. 12. During the next or second portion of the rotation of the drum the rolls 18 and 19 are positively driven to advance the sheet into the bight of the drum 11 and the master M thereon and impression roll 22 while during the third or last portion of the cycle the drum and impression roll advance the sheet and deposit it upon the receiving tray 15. Due to the improved driving mechanism of the parts as later described, the feed rolls 20 are positively driven a distance to feed the sheet into the position shown 7 -in Fig. 12 whereupon the actual feeding movement of the rolls 2'0 ceases but the rolls become free-wheeling as the balance of the top sheet is drawn forwardly from the stack by the then driven rolls 18 and 19. Hence after the sheet has been fed from the stack, the feed wheels 20 become inactive until, during the next cycle or rotation of the drum they again are positively driven. The feed wheels thus do not advance a sheet from the stack except during the first portion of each cycle of the drum. The moistening roll 18 and presser roll 19 provide a positive feed of the top sheet until the sheet has been advanced into the bight of the drum 11 and impression roller 22 whereby the rolls 18 and 19 cease rotation as the sheet completes its passage therebetween. Hence the moistener roll 18 does not need essly or diseffected as above described is shown in Fig. 4, but in describing such mechanism reference will be made to other figures also. The crank is secured to a shaft 24 which is journalled in the side frame members 12 and V 13 and supports the drum 11 as shown in Fig. 13. At the side of the, machine opposed to the crank 23, the end of the shaft 24 which extends through the frame side member 13 has secured thereto an eccentric 25 in the form of a wheel or disc as shown in Fig. 4 which rotates with the shaft. The extreme end of the shaft drives a belt 26 which operates a counter 27 secured to the frame 13 which indicates'the number of drum revolutions and so will indicate the number of sheets fed into and through the machine during a period of use following the resetting of the counter to a given position and thus readily enables the operator of the machine to produce only a selected number of copies from a master on the drum. Journal-led on the periphery of the wheel or eccentric 25, as by means of rollers 28 is an operating member indicated generally by reference numeral 29 and comprising a ring shaped portion 30 carrying the rollers 28 and a radially directed lever arm 31. The arm 31 at its lower end is operatively connected by pivot 32 to one end of a rock lever 33 which is pivotally mounted at 34 to the side frame member 13. The other end of the lever is provided with a roller 35 which operates in a slot 36 provided in the lever-like extension 37 of an oscillatory gear member indicated generally by num-,.

ber 38 which is pivotally mounted at 39 to the side frame member 13. The member 38 has a segmental gear section 40 described about the axis of the pivot 39. As the shaft 24 is rotated in a clockwise direction as viewed in Figs. 4 and 18, the eccentric disc 25 moves the ring portion 39 of the'operating member 29 about the shaft 24 as a center and effects rocking of the lever 33 about the pivot 34. The roller 35, on the end of the lever, during a portion of the arcuate movement thereof, effects rocking movement of the gear member 38. Viewing Fig. 4, it Will be observed that in the relative positions of the member 38 androller 35 therein shown, the portion of the slot 36 below the roller is concentric with the axis of the pivot 34 and that doWn-.

ward movement of the roller 35 arcuately about the pivot 34 will not actuate the gear 38. The return or upward movement of the roller 35 with the lever 33 through the lowermost just mentioned position to the position shown in Fig. 4 will not rock the gear member 38. As shown in Fig. 4 the upper portion of the slot, that is, from the portion embracing the roller 35 upwardly deviates slightly to the right, as shown in said gear member will be rocked orswung, in the first:

figure and as the roller 35 is moved. above the position illustrated, or is swung downward to that position, the

by the gear member 38 occurs after a copy sheet has been fed by feed rolls 20 into engagement with the moistening roll couple 18-19 and after said couple has advanced the sheet into engagement by the drum 11 and impression roll 22 and the imprinting action or duplication on said sheet is being effected.

The moistening roll' 18 is mounted on and fixed to a shaft 41 journalled in the

side frame member

12 and 13 and extending beyond the latter and provided at the said end .with a clutch member indicated generally by numeral 42 as shown in Fig. 4. The clutch is of the type which drives only in one direction, that is, it drives shaft 41 inthe clockwise directionas the clutchis driven in the clockwise direction. As the clutch is driven in the counterclockwise direction it slips and is not effective to drive the shaft 41 which;may,'however, actually be rotated independently in the clockwise direction.

The clutch 42 is of the roller driven type shown in Figs. 19 and 20. As shown in said figures the clutch comprises a core or hub member 43 which is pinned to the shaft 41 at 44, the hub having a control roller engaging portion or race 45. The faces of the clutch are formed of outer end plate 46 and inner end plate 47 to the latter of which is fixed a pinion 48, which, as shown in Fig. 4 constantly; meshes with the teeth of the arcuate rack 40 of member 38.

Intermediatethe plates

46 and 47 is a laminated member 49 formed of a plurality of metalplates 50 of such gauge that they can readily be stamped to like configuration and assem bled as shown. The --plates 50 are shaped during the stamping operation to provide cavities forthe rollers -51 (three being shown in .Fig. 20) and recesses for the springs 52. The springs each tend to urgea roller forwardly into binding engagement between the race-way 45 and the plates 50 to effect one-way driving engagement with the hub 43 and thus with the shaft 41. Thus when the clutch is driven through pinion 48in the counterclockwise direction as viewed in Fig. 20, the rollers are effective to drive the hub and shaft but upon the reverse rotation of the pinion 48 the rollers are freed frorn'the driven engagement with the hub .and the shaft is free to remain idle or to be rotated independently'of the clutching mechanism.

-- The individual plates 50 constituting the laminated porition 49 of the clutch are identical and are provided with openings for bolts or rivets 53 for securing the assembled plates 50 and end plates and 47 together and complementary partial extrusionsi53a, the extruding portions of each plate fitting in the corresponding cavities of another plate to enable the group of plates to be assembled accurately in the assembly of the clutch parts.

Asccond one-way clutch similar in all respects to that above described, isused on the feed shaft 21 as later described. Such second clutch functions in like manner and hence the description of Figs. 19 and 20 may be considered as a description of the details of'such second clutch. i

As shown in Fig. 4, the pinion 48 of the clutch 42 but is released or stops as the pinion 56 is driven couriterclockwise and so enables the shaft 21 to be rotated clockwise by other means as the pinion 56 is driven bythe gear 55 in the counterclockwise direction.

Figures 4 and 18 illustrate the gear 38 in its .two opposed extreme positions and since it is constantly in mesh with the pinion 48 it drives the gear train including the pinion 48, gears 54, 55 and pinion 56 during the active portions of-its movements between the two extreme positions. Referring to Fig. 4 it will be noted that in the position shown the portion of the arcuate slot 36 below the line X is concentric with the axis 34 of the lever 33 and hence when the gear38 is in the position shown in said figure the movement of the roller 35 to an extreme lowermost position and back to the illustrated position the gear 38 will remain stationary. The line indicated by X in Fig. 4 indicates the upper extreme of the concentric portion of the slot when in said position, while the portion of the slot above the line X is non-concentric with axis 34 and diverges in a more upright direction. Hence as the roller 35 moves upwardly from the position of-Fig. 4 it begins to swing the gear 38 clockwise about the axis of thepivotal support 39. As the gear member 38 is turned clockwise by lever 33 as. the lever swings counterclockwise, the roller will move relatively a slight distance toward-the base of the slot as the gear 38 approaches its maximum clockwise position as will be clear from examination of Fig. 18. Thus the rocking of lever 33 as described causes the roller 35 to travel within the slot 36 and in its movement upwardly above the line X of Fig. 4 it swings the gear 38 clockwise as tion 40 and will be driven in the counterclockwise direction as the gear member 38 is swung clockwise, and is driven clockwise as the gear member 38 is swungcounterclockwise. It is the movement of the pinion 48 in the clockwise direction only which drives the shaft 41 and the moistening roll 18 carried thereby while movement of the pinion in the counterclockwise direction effects the above described declutching or non-driving action and enables the shaft to be rotated clockwise as viewed in Fig. 4 independently of the pinion 48 by a copy sheet after engagement thereof by the drum and presser roll.

The pinion 48 also meshes with the teeth of gear 54 which in turn meshes with the teeth of a similar gear 55, both of which are journalled on stub shafts 54a and 55a respectively. Shaft 54a is carried by the side plate 13 while shaft 55a is journalled in a swingable arm of feed roller carrying means later described. Gear 55 meshes'with a pinion 56 which is a portion of a second clutch member indicated generally by number 57 and is secured to the end ofthe shaft 21 which carries the sheet feed means such as the two wheels 20, as above stated :(see Figs. 1 and 2). The wheels 20 preferably are of rubber having serrated peripheries. -The clutch member 57 is the second clutch member referred to above and is identical with clutch member 42 as illustrated in'Figs. 19 and 20. The clutch 57 drives the shaft 21 as the. pinion 56 is driven clockwise, as viewed in Fig. 4,

indicated in Fig. 18 while return movement of the lever 33 fromthe position shown in Fig. 18 to that shown in Fig. 4. swings the gear 38 counterclockwise to the position shown in Fig. 4. However, as the lever 33 continues its downward or clockwise swing from the position of "Fig. 4, and returns to that position the gear 38 remains stationary and hence likewise does the gear train driven by the rack 40. This interval .of non-driving action of the feed roll and the moistening means occurs during each cycle after the copy sheet has been engagedby the drum 11 and cooperating impression roll 22 and the sheet is being imprinted.

- At this point a brief description of the copy sheet feeding operation, the sheet moistening operation and the imprinting or duplication functions of the machine during a single rotation of the drum 11 will make clear the sequential functioning of the mechanism shown in Fig. 4. Assume that a stack of copy sheets 17 has been placed in proper position on the feed table 14 and that the feed" rollers 20 and shaft 21 have been released from the elevated inoperative position shown in Fig. 4 to enable the v rollers 2t) to rest upon the stack as shown in Figs. 1 and *Rotatingthe crank 23 through 180 of'arc in the counterclockwise direction as viewed in Fig. 1 will ro-. tate the shaft 24 and cam'25 through the same are and thus will raise the cam follower lever 29 during the first of movement of the cam and during the succeeding 90- of movement will lower the cam follower lever to the same elevation as shown in Fig. 4 but shifted to the right. 'During such movement of the lever 29 the lever 33 will have been rocked first clockwise from, and then counterclockwise, to the same position shown in Fig. 4. The parts of the mechanism may then be said to be in a starting position of a cycleabout to be described since initial movement of the cam 25 from the assumed position will cause the lever arm 31 to move downwardly and rock the lever 33 counterclockwise from the position of Fig. 4 to the position shown in Fig. 18. Such movement of the lever 33 as stated causes the gear member 38 to swing from the position of Fig.4 to that of Fig. 18 and in so moving drives the pinion 48 of the clutch 42 in a counterclockwise direction. Such movement of the pin-f ion, as described above, causes the'clutch to slip and the shaft 41 will remain idle as will also the moistening roll 18 cammed by the shaft. The described driven movement of the pinion'48 will rotate the gear 54 clockwise, the gear 55 counterclockwise and the pinion 56 of clutch 57 clockwise, all as viewed in Fig 4. Such clockwise rotation of the pinion 56 causes the clutch to drive the shaft 21 and the feed wheel or wheels 20 thereon in a clockwise direction and thus to feed a copy sheet from the stack 17 of such sheets as viewedin Fig. 12. The

copy sheet, designated 17a in Fig. 12, is advanced sufiiciently by the described driving action of the feed wheels 20 to move the forward end of the sheet into the bight of the then stationary moistening and presser rolls 18 and 19 and to bulge the intermediate portion of the sheet upwardly as indicated in'Fig. 12 to causethe forward end of the sheet to tend to move into the bight of the rolls. The crank will have moved about 90 of are from the starting position during this portion of the cycle. During the next portion of the cycle of crank movement of approximately 90 of arc the eccentric disc or cam 25 moves the follower lever 29 from the position shown in Fig. 18 upwardly to the position of Fig. 4 and thus by swinging lever 33 clockwise to the position of Fig. 4 the gear 38 is swung counterclockwiseto the position shown in said figure. Suchcounterclockwise movement of the gear 38 from the position shown in Fig. 18 to the position of Fig. 4 causes the teeth of the rack 40 to drive the pinion 48 of the clutch 42 in a clockwise direction which as explained above effects the driving of the shaft 41 of the moistening rcll 18. 'Such clockwise movement of the roll 18 and the companion contacting presser roll 19 which is driven by the roll 18, feeds the sheet 17a. forwardly into the bight of the drum 11 and the impression roll 22 which latter is driven ,by contact with the drum. The moistening roll 18, in feeding the sheet 17a forwardly as just described applies moisture to the upper surface of the sheet as will be described later. It will be seen that the movement of the gear member 38 from the position shown in Fig. 18 to the position shown in Fig. 4 drives the pinion 4S clockwise which causes the clutch 42 to drive the shaft 41 and so drives theroll 18 in the clockwise direction. Such clockwise movement of the pinion 48 effects, through the motion transmitting gears 54 and 55, counterclockwise movement of the pinion 56 of the clutch 57 on the feed roll shaft 21 but such counterclockwise movement causes a de-clutching effect of said clutch and hence as the bottom portion of the sheet 17a is pulled from beneath the feed wheels 20 by the rolls 18 and 19 said wheels and the shaft 21 are free to be moved clockwise by that portion of sheet 17a still' under the wheels. It will be seen that the clutches 42 and 57 are effective to drive these

respective shafts

41 and 21 as the drive pinions 48 and 56 are driven clockwise but are de-clutched as the respective pinions' are driven counterclockwise as viewed in Fig. 4. In other words, as the gear member 38 moves clockwise from the position of Fig. 4, clutch 42 is inactive while clutch 56 is driven clockwise to feed a sheet from the stack into the bight of the moistening and presser rolls 18 and 19. As the gear 38 is swung from the position of Fig. 18 back to the position of Fig. 4, the clutch 42 is driven clockwise to drive the moistening roll 18 and the companion presser roll 19 to feed the sheet into engagement with the drum 11 and impression roll 22, the clutch 57 meanwhile being de-clutched by the counterclockwise driven movement of the pinion 56.

The sheet 17a is advanced by the rolls 18 and 19 during this second portion of the cycle of the drum and at or about the time that the forward portion of master M in the drum reaches the bight of the drum Hand presser roll 22, the forward end of the sheet 17a will enter the bight and be engaged by the drum and impression roller to continue the forward advance of the sheet. It will be understood thatthe upper surface of the sheet is moistened by the roller 18 and that it will be pressed into sociated driven parts of the roll actuating mechanism will;

be in the relative positions shown in Fig. 4. .During the succeeding of the rotation of the drum the action of the'cam 25 effects clockwise movement of the lever 33 and movesthe roller 35 downwardly within the portion of the slot 36 which, in the position of the gear member 38 shown in Fig. 4 is concentric with the lever pivot 34. Hence the gear 38 remains stationary during this third portion of the cycle of rotation of the drum as well as during the fourth or final portion of rotative cycle of the drum since during such fourth portion the roller 35 moves upwardly from a lowermost position (short of the lower end of the slot 36) to the position shown in Fig. 4. During the last, half cycle of rotation just described, the copy sheet is imprinted, having picked up the necessary liquid from the roller 18. Succeeding rotative cycles of the drum each effects performance of similar functions in the sequence described, thus first, the feed rolls 20 are actuated to feed the top sheet from the stack until the advancing end is pressed; into the bight of the then inactive rolls 18 and 19; the rolls 18 and 19 then become active to feed the sheet (and currently moisten the top surface thereof) into engagement with the rotating drumrotated by the action of the remainder of the sheet being.

drawn forwardly by the rolls 18 and 19 and hence stop rotating as the sheet passes from beneath the feed rolls to avoid advancing the next sheet in the stack until the beginning of the next: cycle of the drum. Likewise, as the sheet is engaged and drawn forwardly by the drum 11 and impression roll 22, the moistening roll 18. becomes non-d'riven by the mechanism but by reason of the action of the clutch 42 the roll is rotatable by the balance of the sheet as it is drawn forwardly from beneath the roll 18 by the drum 11 and roll 22. The mechanism shown in Fig.3 thus drives the feed and moistening rolls in sequence during a cycle of operation of the drum and.

effects the orderly progress of the sheets, in properly timed relation, from the stack on the feed table and through the machine.

In Fig. 3 the feed rolls 20 are shown in an elevated inoperative position to which they'may be raised manually by the operator when the machine is to be unused for a period, to avoid deformation of the rolls. 7 In Fig.

Fig. 3), which arms are pivotally journalled on the stub shafts 54a and mounted in the respective side frames 12 and 13. Stub shaft 55a of the gear 55 is carried by the adjacent arm 61 and hence the gear 55 remains constantly in mesh with the gear 54' as well-as in mesh with pinion 56 in all positions of the supporting frame carrying the feed rolls 2%. The arms 61 are generally similarand each isprovidedv with an upwardly extending portion 62 between which portions is a tie rod 63 which gives rigidity to the frame. The frame arms 61 are located outwardly of the

side frame members

12 and 13 which are provided with arcuate openings 64 to accommodate the shifting movements of the shaft 21 and the tie rod 63.

When thefrarne carrying the feed. rolls. or wheels 20 new fiQ a is elevatedto movelthe rolls to 'inope'rative positionfa .spring actuated latch 65, pivotally'secured at 66=to the side frame member'13 is swung clockwise by the -spring 67 to move. a detent 68, which is: integral with the'latch, to engage within a notch 69 provided in the adjacent arm 61 for releasably retaining the feed frame in anelevated inoperative position. The upper end of the latch 65 extends laterallythrough a slot 70 in the frame member 13 to render the latch manually operable to release the feed rolls from inoperative or elevated position. See Fig. 3.

The feed tray 14 above referred to is of sheet metal and has depending end and side walls: and, asindicated in Fig. 3, is adapted to be removably supported in operative position by studs 71 carried by a transversely extending sheet guide member 72 attached to the

side frame members

12 and 13. The dependingend Walls vofthe tray each is provided with openings 73 which receive the studs 71 when the respective end wall of the tray is placed in the stud receiving-position. Supporting clips 74, secured to the side frame members 12 and'13, engage the depending side walls of the tray as shown in Fig. 3 which together with the studs 71 releasably secure the tray in position. Stud receiving openings 73 are provided in'both depending end walls of the tray, as stated, whereby the tray can be mounted. with either end in the forward position for the purpose subsequently described.

The tray 14 is provided with opposed laterally adjust able sheet guide rails 75 which can beradjusted to accommodate therebetween the sheets M to be used. Each rail can be locked in laterally adjusted positions by a as shown in Fig. 1. Within each housing is a soft'rubber block or pad 78 which is spring pressed outwardly of the housing by spring means located therein when the tension on the springs is released by operation of a manually releasable knob 79. When the springs of the pads are compressed by proper rotation of the knobs 79, the rubber pads are moved inwardly of the rails but upon rotation of the knobs to spring releasing positions the pads are moved outwardly and contact opposed side-edges of a stack of sheets between the properly adjusted side rails for offering a slight but adequate restrain to, retai n the stack of sheets against creeping movement on the feed table or tray 14as themachine operates: .Hencein' use, the paper restraining pad'srestrain the advanceor other disarray of sheets inthe. stackalth'oug-h the topmost. sheet can be moved forwardly by the positive action of. the feed rolls 20 when actuated as previously described.

The feed table or tray 14 can be-reversed end-for-end when such becomes desirable by reason. of the lengthof copy sheets being used. When sheets ofnormal correspondent lengths or longer are being used, the feed table 14. normally is employed inthe position shown in Fig. 1,

. 16 'positionwhendesirable. Such receiving tray1'5 is sup ported normally for in and out adjustment by supports 81, one secured to each side frame of the machine. The

. supporting rhembersare disposed for supporting the tray 15 in a suitably inclined position as indicated in Fig. 3'. Reference has been made above .to the moistening roll '18 and presser-roll 19 and the means for driving the rolls are moistened by the roll 18. The means for supplying the moistening fluid to the roll 18 will now be described.

Located,,-forwardly of the roll 18 is a transversefluid holding trough 81 as shown in Fig. .3 which is suitably attached at the ends to the

side frame members

12 and 13. Extending from the trough 81 is a felt or like wick 82 of a length substantially that of the roll 18 and of a width to overlie an upper portion of the roll. Theupper edge of the wick is held in suitably firm contact with the roll preferably, as by a presser plate 83 which extends transversely of the machine and at each end has an upturned ear 84 by means of which the plate is pivotally attached to the side-

frames

12 and 13. The opposite ends of the other edge of the plate are provided with ears 85 which are provided with studs 86 which (are to'be swung up against the action of the springs 86a to 'release the wick when readjustment, or removal for guides between which thecopy sheets'pass.

cleaning or renewal becomes desirable. Before removing the wick it is necessary to remove an upper sheet guide 88 which'n-ormally cooperates with the lower guide 72 in directingthe forward ends of copy sheets to the bight of rolls 18 and 19 as the sheets are advanced, as above described, by the feed wheels 20.

The guide 88, in the form illustrated as in Figs. 3 and 12, i's of sheet metal and at the ends is provided with leaf springs 89 having depressions 90 which engage studs 91 projecting'inwardly from the frame members to hold the guide in operative position. The lower edge of the guide is provided with end recesses to engage studs 92 located at the ends of'the forward edge of the guide 72, intervening spacer members 93 at the ends eifecting the spacing apart of the adjacent edges of the It will be seen that; by pulling back on the upper portion of the guide 88 to release the springs 89 from the studs 91,

the guide canbe'lifted from the studs 92 and removed, thereby rendering access to the presser plate 83 for re leasing the. wick 82 for adjustment or' removal. 7

but when sheets of shorter length are employed it may be found advisable to reverse the table end-for-end so as to locate the pads 78- somewhat forwardly ofthe position shown in Fig. l to enable them to provide adequate re-" straint to forward or rearward creeping action of the sheets as the machine is being operated. I

The side rails 75 are provided with opposed notches 80 at the forwardand rearward portions thereof for accommodating in. either position. of the table the free descent of the shaft 21 to enable the feed rolls 201to act upon even the lowermost. sheets of the stack.

The feed table 14, as is made apparent from the foregoing description, isreadily removable from'an operative position for placement on the top. of the machine or otherwise in packaging the machine for'shipment-or for storage while the receiving tray 15,'which is supported at the opposed end of the machine whileinuse can be removed if desiredor slid inwardly to an out-of-thewvay The upper guide 88 has a depending, transversely extending wing section 94 which carries a second wick 95' held in position by a clip 96 and a lower forwardly turned lower edge of the wing 94. The wick or wiper 95 bears against the roll 18 and distributes or spreads the liquid on the roll picked up thereby by contact with the wick 82. A wiper wick 81a" attached to the tank 81 is shown in Fig. 12 for removing lint from roll 18.

Fluid is supplied to the trough 81 through a horizontal duct 96 extending from one end of the'trough through the side frame member 12 to a cup or receptacle 97 secured to the outer face of the frame member. Into the cup 97 fluid is released from a fluid holding tank 98 for maintaining a selected fluid level in the trough while the machine is in an operable condition or in use, the tank being arcuately adjustable to an inoperable position to avoid needless replenishment of fluid in the trough dur-i a fluid feeding position. -In Figs. 9 and 10 one end of t=l1=li21-nk is shown extending through an openingi'rrthe frame member 12 and at said end is provided wth gravity feed means comprising a connector member 99 through which fluid from the tank can flow into a tubular section 100 and thence into avalve chamber member 101. The lower end of the member 101 has a fluid outlet passage 102 and a surrounding valve seat 103. A ball valve 104 in the chamber is secured on a valve stem 105 which extends through a diametrical passage in the ball. The lower portion of the stem 105 below the ball valve pro- .jects through the outlet opening 102 and in contacting the base of the cup 97, will lift the ball from the seat to permit the flow of fluid into the cup. On the upper portion of the valve stem 105, above the ball valve, is a compression spring 106, the lower end of which seats on the ball and the upper end of which is centered in the member 101 by suitable means, as the head of a rivet 107 in the cap 108 of the member 101. The rivet secures a brace 109 to the fluid discharge structure to rigidify it, the other end of the brace being attached to the tank 98. The ste'm 105 is of such length that when the tank 98 is rocked clockwise to the position shown in Fig. 9, the stem 105 engages the bottom of the cup 97 and unseats the valve against the action of the spring 106 whereby fluid from the tank can flow into the cup and from the cup through the duct 96 into the trough 81. The flow of fluid from the tank will be interrupted when the fluid in the tank and cup cover the discharge opening 102. As the fluid in the trough 81 is consumed in use or by evaporation, the level of fluid in the trough is restored by automatic discharge from the tank while the tank is in the position shown in Fig. 9. Upon counterclockwise rotation of the tank from the position shown in Fig. 9 toward an inoperative position, the spring 106 will close the valve to prevent evaporation of fluid from the tank until the tank is returned to the operative position shown in Fig. 9.

As stated, the tank is mounted for limited pivotal movement on its longitudinal axis. At the side of the machine shown in Fig. 9 the tank if pivotally supported by an axial stud 110 supported by a bracket 111 which is secured to the outer face of the frame member 12, the stud extending into a bushing secured to the end wall of the tank. At the other end of the tank, which extends into an opening in the frame member 13, an axial stud 112 carried by a bracket 113 on the outer face of the frame member 13 (see Fig. 4) extends into a bushing secured to the adjacent tank end wall 114 and provides a supporting pivot. The tank is thus rockable about the longitudinal axis on the pivots 110 and 112.

For the purpose of facilitating the movement of the tank between the operative fluid delivering position shown in Fig. 9 to an inoperative position wherein the valve is in the position shown in Fig. 11, the end of the tank shown in Fig. 9 has a radially extending arm or bracket 115 which carries a stud 116 extending inwardly of the machine through an arcuate passage 117 in the frame member 12 and has a finger piece 118 thereon whereby when the side frames 12 and 13 of the machine carry the ornamental casing members 1211 and 13a as shown in Figs. 1 and 2, the tank 98 can be operated conveniently. The finger piece 118 is shown in Fig. 2.

When the tank is in the operative position shown in Fig. 9 the bracket 115 is adapted to abut and adjustment screw 119 carried by a bracket 120 secured to the outer face of the frame member 12. By adjustment of the screw the operative position of the tank can be varied for raising or lowering the level of fluid in the trough. By'raising the fluid level in the trough the wick 82 will apply more liquid to the roller 18 and thence to the copy sheets. In Figs. 21 and 22 a more convenient mechanism for adjusting the tank for varying the level of fluid in the trough is shown and will be later described.

A helical spring 121 is shown in Fig. 9 which is attached at one end to bracket 111 as by a stud 122 and to a lateral projection 123 of the bracket 109. The tension line of'thespringbetween the points of attachment of the ends of the spring is below the pivotal axis of the tank when the latter is in the operative position shown in Fig. 9 and hence tends to hold the tankin the opera tive position. As the tank is being manually rotated toward the inoperative position for the purpose of shutting off the feed of fluid to the trough, at the position where the projection 123 passes counterclockwise to a position above a straight line through the pivotal axis of the tank and the stud 122 at the other end of the spring 121, the spring acts to continue the counterclockwise movement of the tank until the stud 116 'seats at the other end of the slot 117. The structure described constitutes a quick snap-over mechanism which tends to hold the tank in the operative position of Fig. 9 or the fully inoperative position suggested by Fig. 11. By simply swinging the finger piece 118 arcuately as described, the flow of fluid fromthe tank to the trough is prevented and the fluid in the tank is conserved against evaporation during periods of non-use of the machine.

The tank 98 which is formed primarily of brass or other non-corrosive metal is provided with a filler opening normallyclosed by a screw cap 124 (seeFig. 1). The tank also preferably is so constructed as to provide one or more sight openings which reveal visually the amount of fiuid remaining in the tank for the convenience of the operator and so reduces the chance that the fluid in the tank will become exhausted during use of the machine. One sight opening is indicated by the numeral 125 and is formed by providing an opening in the cylindrical wall of the metal tank. A glass cup-like receptacle 126 is inserted in the corresponding end of the tank with the side .wall of the receptacle extending over the sight opening or openings. The receptacle is cemented in place within the tank to prevent leakage, the bottom of the receptacle being disposed inwardly'of the adjacent metal end wall 114 of the tank which is secured in place, as by solder, following the insertion and cementing of the receptacle.'

For the purpose of enabling the operator of the machine to vary the pressure of the

rolls

19 and 22 against the respective moistening roll 18 and the drum 11 as may be desirable from time to time in the operation of the machine, mechanism is provided for eflecting such'results by movement of a single manually operable member.

Viewing Fig. 12 it will be seen that an end journal of the axial shaft of roll 19 is supported in an open recess in the upper end of a supporting member 128 which is pivotally attached at 129 to the frame member 12. Referring to Fig. 3 it will be seen that a mating supporting member 130 is pivotally supported at 131 to the frame wall 13. The supporting members which are located at the inside walls of the

frame members

12 and 13 are in opposed positions for supporting the presser roll 19 normally in contact with the moistening roll 18. Viewing Fig. 3 it will be seen that swinging the supporting members 128 and 130 forwardly or to the right, the roll 19 will be pressed more firmly against the roll 18. When the members 128 and 130 are swung in the opposite direction the pressure of the roll 19 against roll 18 will be relieved and that by swinging said members 128 and 130 sufficiently to the left, the roll 19 can be lifted from the members for removal for cleansing or renewal.

The impression roll 22 is similarly supported in members .132and 133, which are pivotally secured'at 134 and 135 respectivel'y'to the opposite

side frame members

12 and 13. Swinging bmovement of the

members

132 and 133 tome-right, as'viewed in' Fig. 3 will increase the pressure of roll 22 against the drum while reverse swinging movement will relieve the pressure and if through an adequate arc'will'enable the roll 22 to be lifted from position for cleansing or renewal.

As 'shownin..Fig; ,,3 a spring 136 .is releasa'bly secured in openingsginthe:

members

130 and 133; while in Fig. 12

the pressure exerted thereby against the roll:18 and drum 11 respectively comprises a transverse shaft 138 journalled in the

side frame members

12 and 13. The shaft has secured thereto intermediate the

frame side plates

12 and 13 a flanged eccentric cable-tensioning drum 139. A cable 140 has one or two convolutions around the drum 139 and the ends extend rearwardly into attachment with means which insure concurrent movementof the

members

132 and 133. As shown in Fig. 3, the

opposed members

132 and 133 are slotted to receive the ends. of an L-shaped cross bar 141. The horizontal flange of the bar is slotted at 142 to receive a depressed dog or tongue 143 of a bar 144 having a forward up-turned end-145 which is apertured to receive one end of the cable140. The end of the cable has an anchoring member 146 thereon. The other end of the cable 140 has attached thereto a threaded member 147 which extends through a vertical plate 148 having a transverse slot receiving therear of the horizontal bar 144 and abutting the rear of the cross bar 141. A nut 149 on the threaded member 147 provides means for adjusting the tension of the cable. A flexible washer under the nut is effective to maintain the tautness of the cable in use even after'limited expansion thereof. Arcuate adjustment of the shaft 138 from the position shown in Fig. 3, will move the cable runs forwardly and thus swing the

supports

132 and 133 forwardly or counterclockwise (Fig. 3) and press the-roller 22 more firmly against the drum. When :su ch movement is imparted to the

members

132 and 133 the

springs

136 and 137 will swing the supports 128 and 130'in the same direction and increase the pressure of the presser roll 19 against the moistening roll 18. In Fig. 3 the cam 139 is shown in a position for exerting minimum pres sure of the

rolls

19 and 22 against the cooperating roll 18' and drum 11 but, during periods of non-use, as overnight or weekends, it may be desirable to free the

rolls

19 and 22 from contact with the roll 18 and drum 11 respectively to avoid the deformation of the rolls. This can be accomplished by lifting upwardly on the right-hand end of the bar 144 to free the tongue 143 from the slot 142. The brackets which carry the

rolls

19 and 22 are thus freed from the holding action of the cable and can swing out of contact with the moistening roll and the drum as will be obvious. By grasping the bar 148 with the fingers and exerting pressure with the thumbon the up-turned end 145 of the bar 144, the tongue 143 can be caused to be re-latched within the slot 142 in restoring the parts to operative position. Various cable tensioning positions of the drum 139 are shown in fig. 7. A guard 150 about the convolutions of the cable on the drum 139 is shown in Figs. 6 and 7 also but isdetached inFig.8. For the purpose of adjusting the shaft 138 and eccentric drum 139 for varying the pressure exerted by

rolls

19 and 22 against the moistener roll 18 and drum 11 as above described, one end of the shaft extends through the frame member 13 and bears a flanged drum 151. See Fig. 4. A cable 152 has one or two convolutions about the drum 151 and is intermediatelyanchored thereto at 151a and the end portions, being crossed, extendinto engagement with a lever arm 153 which is pivotally mounted on the end of the shaft 24 which carries the drum 11. One end of the arm bears a finger-piece or knob 154 extending through an arcuate slot 155 in the frame member 13 where the knob is accessible to an operator'of the machine. rolls 19 and 22 against the copy sheets passing through in Fig. 13.

The operator can increase the pressure of the 14 the machinefor varying the intensity "of the imprints by adjusting the knob 154 within the slot155. In the upper position of the knob within the slot as indicated in Fig. 4, the rolls 18 and .22 exert minimum pressure against the roll 18 and drum 11, whereas by lowering the knob, the pressure is increased. Increasing the pressure by lowering the knob intensifies the imprinting result.

As previously described, rotation of the shaft 24 by the crank 23 eifects the rotation of the drum 11 as well as the gear train shown in Fig. 4 which etfectsthesequential positive driving movement of the feed rolls 20 and the moistening roll 18. The drum carries a master M during the functioning operation of the machine. Such masters may vary in'the disposition upon the same of the copyable matter which they bear. A master may have the copyable matter beginning near the top ofthe master sheet while it may be desirable to locate such matter relatively lower on the copy sheets, as where such sheets are in the form of letterhead; for example. In some instances the reverse of the above may be desirable in producing copies which-are of well .balanced design or arrangement. Hence the present invention provides means for ancuately adjusting the drum 11 upon the drive shaft 24 whereby the copyable matter on a master M will be imprintedgon the copy sheets in relatively higher or lowerpositions. For effecting the adjustment of the drum 11 upon the drive shaft 24 for accomplishing the results above adverted to, the drum, while carried by the shaft 24' is not positively. secured directly to the shaft but is secured to a'tube 156 which is mounted on the shaft as shown The drum 11 has a central transverse web 157 and an integral hub 158 through which the shaft 24 and the tube 156 extend. A set screw 159 secures the drum to the tube. against relative rotation with respect thereto. The tube 156 extends outwardly through a bushing 160 provided in an opening in the frame member 12 and has secured thereto, by a set screw 161, a hub portion of a worm gear support 162 which is located within an enlarged hub-like casing portion 163 of the crank 10. The casing 163 is generally hollow as shown in Figs. 15, 16 and 17 but is provided with strengthening ribs 164 which engage the support; 162 for cooperation with a screw 165 in holding the support in position within the hub-like casing. The support 162 carries a worm 166 which meshes with a worm gear 167 secured to the reduced outer end of the shaft 24. On the ends of the shaft of the worm are two manually operable adjustment wheels 168 which extend partially through openings in the end wall of the casing '163 as shown in Figs. 1, 2 .and 13 to enable the wheels or one of them to be manually operated in either direction. By rotation of the wheels 168 while holding thecrank 10 against movement, the gear 167 and shaft 24 will be rotatedrelative to the drum 11 or if the wheels are rotated without holding the crank against rotation the drum will be rotated relative to' Such relative adjustment between the drum the shaft. and shaft can be effected in either direction simply by rotating the adjustment wheel or wheels 168 in a correlative direction. v 1 1 1' Adjacent the other end of the drum 11, the shaft 24 has secured thereto a pointer 169, the outer end of which is adjacent the peripheral edge of the drum 11 which carries graduations 170 thereon located on opposed sides of a central zero or other indicia as shown in Fig. 2. As viewed in said figure, if the wheels 168 are rotated in a direction to produce movement of the drum 11 clockwise relative to the shaft 24 or to the right as viewed in Fig. 2, the degree of such relative movement with reference to the zero marking the center of the graduations will be shown. Such moyeme'nt' of the drum relative to the shaft will move the master with it'and so move the. master to a position requiring further rotative movement of the drum before the master contacts the copy sheet moving through the machine. The result of such adjust ment of the drum on the shaft will be to lower the Idea tion of the matter imprinted on the copy sheets. while adjustment of the drum in the opposite direction will locate the. imprinted matter higher on the copy sheets.

If an operator'notes. on the master the position of the drum on the shaft by reference to the graduations, the same relative setting of the drum can be elfected by operating the wheels. 16% when such master is again employed in the making of copies and thus similar location of the, imprinted matter upon the copy sheets will be obtained. v

The master clamp bar 16 which holds the upper end of a master M upon the drum can be raised by suitable mechanism to release a master on the drum or to raise it for receiving a master. Such mechanism is shown in Fig. 14. The master clamp bar 16 is located in a slot or passage 17% provided in the cylindrical face of the drum and in a rib portion 171 as shown in Fig. 12. As shown in Figs. 12 and 1.4 the bar has a master engaging extension or hp 172 which when the bar is in seated position clamps, the end of master M to the drum. A shallow lip receiving recess 173 receives the lip and the clamped upper edge of the master. The clamp 'bar '16 is provided with a pair of studs 174 which extend through suitable passages in the base of the rib 171 and are provided with nuts. 175 on the ends between which and the base of the lib are compression springs 176 which normally seat the bar in the clamping position shown in Fig. 12.

In Figs. 13 and 14 a lever 177 is shown which is pivotally'mounted at 178, to side frame 12 and carries a roller 17disposed in a slot180 in a second lever 181 which is piy'otally mounted at 182 to said frame member 12. The lever. 181. at its upper end portion carries a roller 183 which projects inwardly. A U-shaped lever 184 extends through an opening in the web 157 of the drum and has the'ends 18S pivotally connected to the ends of the rib-171 on an axis defined by the two mounting studs 1 86 and 137. A wire spring 188 mounted on the stud 18') tends to hold the U-shaped lever 184 upwardly although .the stronger springs'176 can depress the lever when theclamp bar is seated thereby.

The ends of the clamp bar 16 carry studs 189 which project from the bar through the open ends of the slot 170 in the rib 171 for engagement with the ends 185 ofthe swingable lever 184. The end 185 of the lever shown in Fig. 14, which is the left-hand end shown in Fig. 13, has secured thereto, as by rivets 190a a cam member in the form of a plate 190, the right-hand end of which, as viewed in Fig, 14 has an inclined cam edge 191.

In Fig. 14 the lever 177 is shown in a position in whichithe clamp bar 1 is elevated to a position for receiving a master M or for removing such a master. If the. lever 177 is swung manually clockwise as viewed in Fig; 14, the stud 179 operating in the slot 180 of lever 181 will cause such lever also to swing in a clockwise direction and thus move the roller 183 out of engagement withthe cam plate 1% and permit the springs 176 to restore the clamp bar 16 to a seated position in the slot 170' and thus to clamp the edge of a master sheet M to the drum. When the

levers

177 and 181 have been so swung they do not interfere with the rotation of the drum.

-When it is desired to elevate the clamp bar 16 to release a master or preparatory to attaching a master, the lever 177 is swung counterclockwise from the described inoperative position to swing the cam operating roller 183 of the. lever 181. into the relative path of the cam. 19%. The drum 11 is then rotated clockwise from.

anassumed position not shown to move the cam edge 1&1 into engagement with the roller 1&3 whereby the cam swingsthe' UI-shapedlever 13 i counterclockwise, asviewedinFig. l4, and causes the upper edges of the 18.5,, to engage the studs 189v to lift the clamp bar as, illustrated. in. saidfigure. Upon. insertion ofthe edge of, afmaster. M under the. lip 172 of. the clamp bar. as

shown in Fig. 14; clockwise movement of the lever 177 permits the springs 176 to restore the bar to clamping relation.

in Fig. 14 it will be noted that when the

levers

177 and 181 are in the elevated positions shown, the relation of the stud 17? of the lever 177 to the pivot 178 of the lever 177 is such as to firmly support the lever 181 in the operative position illustrated. Hence the operator preparatory'to elevating the clamp car may merely move the lever 177 to the operative position shown and then rotate the drum clockwise to move the cam into the elevating position on the roller 133 of the lever 181. It thus is not necessary to manually retain the lever 177 in the clamp-bar elevating position which arrangement leaves both hands of the operator free in inserting a master in clamping position. under the lip 172 of the clamp bar. Suitable indicia preferably is stamped on the edge of the drum 11 indicating a preferred rotative position of the same before the lever 177 is swung to the operative position, after which positioning of the lever, the drum is moved to the position shown in Fig. 14

for elevating the clamp bar. However, should the drum 7 be in the rotative position shown in Fig. 14 when the lever 177 is swung to the operative position, the clamp bar ill be elevated as shown. The clamp bar elevating mechanism acts on both ends of the bar in elevating it while the springs 176, which are located adjacent the ends of the bar exert adequately distributed pressure on the bar to provide firm clamping action upon a master in operative position on the drum.

Figures 21 and 22 show structure which can conveniently be operated for effecting the arcuate adjustment of the tank98 for varying the elevation of the discharge outlet 102 of the valve chamber sill within the cup 97 for varying the level of fluid within the trough and thus varying the amount of liquid supplied by the wick 82 to the moistening' roll 18 and by the latter the amount applied to the sheets of copy paper passing through the.

machine. In said figures there is shown a slidable bar 192 which is attached by the headed studs 193 to the inner surface of the frame member 12. A spring 194, attached at one end to one of the studs 193 and at the otherend to a stud 195 projecting from the bar inwardly of the machine, slides the bar to the right intov contact with a rotatable stop member 196 mounted on a shank 197 journalled in the side member 12. The outer end of the shank is provided with a wheel or knob 198 by means of which the member 196 can be adjusted to move any of the severaldepressions or recesses 199 of the edge into operative relation with the adjacent end of the bar 192 which is shaped to seat in any of the recesses. The scolloped edge of the stop member 196 is eccentric with respect to the axis of rotation and hence by adjusting the knob to move any recess 1% into contact with the. end of the bar, the latter will be adjusted to the right by the spring or to the left by the eccentric, depending on the radial distance of the receiving recess from its axis of rotation.

The opposed end of the bar 1&2 which is turned inward of the machine carries a screw 200 and nut 201, the end, of the screw abutting the ear or bracket of the tank. By adjusting the knob 198 home given position, the bar 192 can be shifted by the, cam 196 to the left or the latter will permit the spring194 to shift the bar to the right and so move the end of screw 200 to the left or, right for varying the fluid discharge position of .thetank. By adjusting the cam 31% to shift the bar 192 the maximum distance to the left as viewed in Fig. 21, the valve chamber 161 will be in the highest operating position within the cup and the flow of fluid into the trough will not be shut or? until the level in the trough is. approximately at the top of the duct 96. With the fluid in thetrough at suchhigh level, the wick can supply more: fluid to the roll.18 than will be the case if the aesenoe cam 196 is adjusted to the position wherein the bar 192 is shifted the maximum distance to the right wherein the level of liquid in the trough will be at a lower level. Different fluid levels in the trough are indicated in Fig. 22.

Preferably the knob 198 and the adjacent portion of the frame member 12 bear indicia to indicate the positions of the knob which provide high, low and intermediate levels of liquid in the trough.

While the improvements shown in the drawings and above described are illustrative of the invention, it will be apparent that various changes in details thereof may be made without departure from the scope of the invention defined by the appended claims.

We claim: s

1. In a duplicating machine, a rotary drum and a rotary moistener roll and a pressure roll associated with each, a holder for each pressure roll, adjusting means including an eccentric having a cylindrical portion, means connecting the holders with the adjusting means including a cable at least partially encircling said cylindrical portion, a guard detachably mounted on the cylindrical portion in enclosing relation to the encircling portion of the cable, said guard being generally C-shaped and closely approaching 360 in circumferential extent with terminal extensions circumferentially facing each other and relatively axially olfset to provide cut-out portions circumferentially remote from the terminals of said extensions to accommodate runs of cable, and manually operable means for rotating the eccentric.

2. In a duplicating machine, a rotary drum and a rotary moistener roll and apressure roll associated with each, a holder for each-pressure roll, adjusting means including an eccentric having a cylindrical portion, means connecting the holders with the adjusting means including a strand connected at its ends to the holders and a mid-portion at least partially encircling said cylindrical portion, a pulley on said eccentric, a cable at least partially encircling the pulley, and a pivotally mounted lever, the ends of said cable being secured to said lever at opposite sides of the axis of the lever, said lever having a manually accessible portion for grasping and manual actuation for varying the pressure exerted by the pressure rolls on the drum and driving roll.

3. A duplicating machine comprising a rotary cylindricalmember, a roll member engaging the cylindrical member, the members being operative to pass a sheet therebetween upon rotation thereof, means mounting one of the members for movement into and out of pressure engagement with the other, manually actuated means and means interconnecting said manually actuated means and the one member, said manually actuatable means being operative for adjustably varying the pressure exerted by the one member on the other when they are in such pressure engagement, said interconnecting means including means for releasably retaining the one member in such pressure engagement in any given setting of the manually actuated means, said releasable retaining means including a first element secured to said mounting means and a second element secured to the interconnecting means guidingly slidable through an aperture in the first element, said elements having interlocking portions releasably engageable upon movement of the elements in relatively opposite rnd locking directions by gripping them between the fingers end compressing them.

.4. A duplicating machine comprising a rotary cylim drical member, a roll member engaging the cylindrical member, the members being operative to pass a sheet therebetween upon rotation thereof, means mounting one of the members for movement into and out of pressure engagement with the other, a cable secured at its ends to the mounting means and forming a loop portion, manually actuated means engaging said loop portion operative for adjustably varying the pressure exerted by the one member on the other, and means forming connecting means between one end of the cable andthe mounting means for releasably retaining the one member in such pressure engagement with the other in any given setting of the manually actuated means.

5. A duplicating machine comprising a plurality of cylindrical members and a pressure roll associated with each, means for mounting each pressure roll for movement into and out of pressure engagement with the respective cylindrical member, manually actuated means for adjustably moving one of the mounting means for varying the pressure exerted by the associated pressure roll on the respective cylindrical member, yieldable means serially interconnecting the plurality of mounting means for transmitting the pressure varying movement from' the one mounting means to the remaining mounting means, and means for releasably retaining the one mountmg means, and therethrough the remaining mounting means, in position for establishing pressure engagement member for movement into and out of pressure engage,

ment with the cylindrical member, manually actuated means including a rotatable shaft, an eccentric on the shaft and having a cylindrical portion, a flexible strand having a mid-portion at least partially surrounding said cylindrical portion and its ends connected to the mounting means, said shaft and eccentric being operable on I rotation thereof for adjustably varying the pressure of the roll member against the cylindrical member, and flexible means interposed between one end of the strand and the mounting means for maintaining the pressure of the roll member against the cylindrical member in any given setting of the manually actuated means notwithstanding limited expansion of said strand.

References Cited in the file of this patent UNITED STATES PATENTS 2,573,810 Rundblad Nov. 6, 1951 2,659,304 Keil Nov. 17, 1953 2,661,686 Levin et al. Dec. 8, 1953 2,721,514 Quirk Oct. 25, 1955 2,722,885 Keil Nov. 8, 1955