US1812720A - Dampening device - Google Patents

Description

June 30, 1931. J. SCHULTZ 1,812,720

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June 30, 1931. SCHULTZ 1,812,720

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June 30, 1931. J ISCHUI TZ 1,812,720

DAMPENING DEVICE Fi led June 2. 192a 4 Sheets-Sheet 4 vii Patented June 30, 1931 JOSEPH SCHULTZ, OF CLEVELAND, OHIO DAMPENING DEVICE Application filed June 2, 1928. Serial No. 282,420.

My invention pertains to a dampening device and more particularly to an appliance for selectively controlling the supply of moisture to axially alined sections of a roller of a lithographic press. The drawings exemplify an embodiment of my invention including both automatic and manual water feed control appliances and which has been successfully used on the standard type of 1c lithographic press.

In lithographing, a certain amount of moisture is required to keep the plate adequately dampened. My many years of experience with the lithographic industry convinces me that a conservative estimate should attribute thirtyper cent of the trouble encountered in lithographic printing to the dampening procedure. At present, moisture is transferred from a roller immersed in a Water supply to a duct roller which is movable into or out of contact with the waterroller and which, when it is in contact with the Water roller, is adapted to retransfer the water to other dampening rollers and thence to the plate. It is important to control the amount of transferred moisture in order to obtain the best'results under varying conditions. A common type of water control heretofore used, consists of what has come to be known as a water stop or wiping device for limiting the amount of water which is carried on the water roller as it rotates in its bath. Not only does the required pressure of the wiper against the water roller act to Wear ofi its cloth covering, but it has always been inadequately satisfactory, because after being set it prescribed the same amount of moisture substantially uniformly across the width of the plate or from one side of the press to the other. As will be appreciated by those experienced in the art, different areas of printing on a sheet require diiferent degrees of moisture. For instance, in label -and poster production, which commonly have solid ink impressions, such products should be supplied with at least" three differing amounts of moisture according to the relative locations of uncovered areas of the plate,.of paper areas which are to receive half-tone impressions or relatively small type and of paper areas which are to receive solidly inked impressions.

Accordingly, the general object of my invention is to supply moisture in varying quantity as and precisely where needed. A more specific object of my invention is variously and selectively to apportion the delivery or transfer of moisture in a direction parallel with the axes of the roller so that no moisture will be transferred to large uncovered areas of the plate, so that only a small amount of moisture will be transferred to the printing plate sections which will record the half-tone impressions and so that a greater amount of moisture or dampening effect will reach those portions of the plate by which solidly inked streaks or solids are to be printed.

The varying grades of dampening requirements may be said to range between two extremes, one being, for instance, lateral edge bordering areas of the plate which are not to come in contact with paper and hence require the least or no moisture, and the other being any solidly inked design. My invention permits of precise regulation for all conditions expectably to be encountered.

Adverting to the drawings:

Figure 1 is a plan view of a standard type of lithographic press with certain upper portions omitted to reveal the relative positions of the parts of a dampening device embodying my inventions.

Figure 2 is a vertical sectional view, partly in elevation, taken on line 22 of Figure 1.

Figure 3 is a vertical section somewhat enlarged on line 3-3 of Figure 2.

Figure .4 is a diagrammatic plan View of a sheet to be printed on a lithograph press and 9 showing different intensities of ink required for different portions of a print and a suitable corresponding selection of settings of adjustable elements of my improved device designated by numbers.

Figure 5 is an enlarged view of a portion of Figure 2 showing certain details of the preferred form of my construction.

Figure 6 is a fragmentary elevation of a portion of Figure 5 looking in the'direction indicated by the arrows on lines 66 of Figures 2 and 5.

Figure 7 is a correspondingly enlarged perspective view of one of the adjustable elements consisting, as exemplified, of a composite tape having five segments of varying thickness. 1

Figure 8 is aview corresponding to Figure showing a simplified modified form of supplementary water conducting means.

' Figure 9 is a perspective view of one of a series of adjustable appliances to be used in Figure 8.

Figure 10 is a partial view like Figure 8 with another modified detail.

Figure 11 is a perspective view of a somewhat shorter appliance than the similar one shown in Figure 9, and of the modified type adapted for use with the apparatus illustrated in Figure 10.

That end of a lithograph press where the printed sheets are discharged is usually considered to be the front end and therefore Figure. 1 has been placed on the sheet so that its front side extends along the right margin of the sheet, but it will be perceived that the combination of parts, constituting my dampening device, are all on the rear side of the multiple superposed rollers and in fact are carried by a bracket supported on a pair of rods below a water pan, being pivotally mounted on one rod and adapted to be additionally supported by the other.

My experience with prior and present practice leads me to know that reliance has been placed upon transference of water or moisture-from a water pan through the agency of a water roller partly immersed therein, together with a wiper on the rising side of the roller for limiting the amount of water carried around by the absorbent cover thereof preparatory to selectively intermittent transfer to a bodily shiftable dampening duct roller by contact therewith. Present practice, so far as my knowledge extends,

may be said to depend merely upon control of the amount of water carried from a source of suppl, by a water roller. As contradistinguishe my invention consists of a multiple selective control by the addition of an extra supply of moisture from above by means of a plurality of'independentl operable water transferring appliances which are adjustably alined crosswise of the press or along the axis of the water roller and which appliances themselves include adjustable units. While both the preferred form and the simplified modification of my invention, as illustrated in the drawings, utilize the principle of capillary attraction I would have it understood that I do not mean to have the patent scope restricted thereby. The broad principle of supplying excess moisture selectively in varying amounts at a plurality of alined points crosswise of the press might conceivably be accomplished by minute sprays from needle valves. It is to be realized that the scope of my invention comprehends many equivalent methods and constructions. The showing of the drawings and the particular description are merely specific exemplifications of a plurality of mechanical embodiments and arrangements.

Since what is illustrated in Figure 1 of a standard lithograph press is merely to disclose the relative location of my dampening device and to disclose in what manner it is attached thereto, only a few supporting and moisture conducting cooperating elements have been again illustrated in other figures and need be referred to in the description. A base frame 1 comprises end standards 2 across which is mounted a shaft 3, connected with any suitable power drive, and carrying (see Figure 2) a printing or paper cylinder 4:, which at one end has secured to it a gear 5 in mesh with a gear 6 on a blanket cylinder 7 which is mounted on another shaft 8. The gear 6 in turn meshes with a gear 9 which is fixed to a plate cylinder 10. In peripheral contact along the top of the plate cylinder 10 are four ink rollers 11 and in contact with one side of the plate cylinder 10, as shown in both Figures 2 and 5, are a pair of spaced dampening rollers 12 both of which contact with a rotating brass roller 13, the opposite side of which has peripheral engagement with a dampening duct roller 14, which by means of mechanism designated in its entlrety by the numeral 15, is bodily movable into and out of engagement with a water roller 16 carried by a shaft-17. The bodily movement of the dampening duct roller 14 is adjustable for frequency and is usually accomplished automatically. to suit the supposed requirements of any particular job. No further description should be required because that control has long been common practice.

The rear side of the upward extension of the press carries two spaced rods 18 and 19 and at opposite ends of the former are turnably mounted a pair of brackets 20 including forward extensions and adapted to project past the ends respectively of a water pan 21 which extends across substantially from one side of the press to the other and has constituted a part of a standard press. The forward ends of the brackets are adapted to rest on the rod 19. Set screws 22 are provided for fixing the brackets 20 to the rod 18. Upon loosening the set screws 22 the entire superstructure, which is carried by the brackets 20 may be swung rearwardly about the rod 18 as an axis to bring it to an inutile position for inspection or repair. Connected with the water pan 2]. is a tube 23, preferably fiexible which extending downwardly, as

shown in Figure 2, leads into a main water supply or reservoir 24:, which is appropriately secured in position in any suitable manerareo ner of. no consequence to this invention. Leading from the reservoir 24 is a hose 25 carrying on its immersed inlet end a strainer 26 and connected at its outer end with a pump 27 driven by a pinion 28 which is in mesh with the gear 5 on the printing cylinder. The discharge port of the pump 27 is connected with an upwardly extending hose 29 leading to and discharging into an upper auxiliary Water supply to be later described.

Secured in an upstanding position to each of the brackets 20 is a short rod 30 to which is adjustably secured a shelf 32-by means of a common'pair of lock nuts 33 which are located on opposite sides of the shelf. A longer upstanding rod 31 is similarly supported by each of the brackets '20 and is similarly secured to the shelf by a pair of lock nuts 34. Secured in any suitable manner to the shelves 32 is an auxiliary water pan 35 provided with an overflow pipe 36 and a drain pipe 37 controlled by a valve 38 and adapted to drain any water in the pan 35 into the pan 21. The forward side of the pan 35 has depending from it a rather thick, yet yielding, wiper 39, which may be composed of molleton absorbent cloth, and which is secured along its upper border to the pan 35 by screws 40. It should be understood that the wiper 39 extends crosswise of the press along the entire length of the pan 35 and so that its lower end contacts with substantially the entire length of the water roller 16. It may be here interpolated that this preferred form of my invention does not necessarily require a cloth covering on the water roller and accordingly avoids the necessity of rather regular replacement because of wear thereof.

The screw threaded upper ends of the two longer rods 3l are provided with lock nuts 41 between each pair of which is clamped a forwardly projecting bracket 42 between which is mounted a rod 43 on which are loosely mounted a large group of spools 44. Also loosely carried by the rod 43 between each pair of the spools 44 are elongated spacing hangers 45 which extend somewhat above the tops of the spools 44- and downwardly to a position near the bottom of the pan 35. The lower ends of the spacers 45 are intersected by a rod 46 which loosely carries a corresponding number of smaller spools 47 likewise positioned one between each pair of spacers. It should be understood that the spacing hangers 45 exercise the function of loosely hung hangers so that the spools '47 tend gravitationally to swing to a position to bring the rod 46 vertically below the rod 43.

In order not to obstruct the desired extent of other entirely free rod 49 carries a correi135 sponding number of similarly alined spools 50 which are arranged in a row mainly within the confines of the pan 35.

An endless composite tape or band, designated in its entirely by the numeral 51, extends around each set of three spools 44, 47 and 50 which are disposed in the same vertical plane and so that each tape is normally held fairly taut by the weight of one of the spools 50 and a proportional amount of the weight of the rod 49. It will be observed that each composite tape extends over the forward rim of the pan 35 at a point between itsenveloped spools 47 and 50 and so as to maintain its spool 50 elevated with respect to the bottom of the pan 35. As so arranged all the tape structures may be adjusted up or down by means of the lock nuts 41 and that rearwardly presented portion of the composite tape which is in contact with the rear of one of the spools 47 is gravitationally adapted to .rest against the wiper 39, not only to insure pressure of the latter against the water roller16, but to transfer water thereto as will now be explained.

Each composite tape includes, as exemplified in Figure 7 five segmental sections of progressively varying thickness. One section 52 is nonabsorbent and may be composed of flexible metal, the next four 53, 54, 55 and 56 are in sequential order of progressive- 1y heavier absorbent material (felt or molleton) and are proposed uniformly to conduct or transfer correspondingly varying amounts of water from the pan 35 to the wiper 39 by capillary attraction. That is to say, the section 53 will transfer less water than the somewhat thicker section 54 of enhanced absorbing properties, or the section 56 of heaviest material will transfer even more water than the section 54. The purpose of the unabsorbing section 52 is to provide one section which, when it occupies the pan rim-overlywill frustrate the transference of moisture. It should be understood that the number of distinct sections of which each tape is com posed, may be varied according to the requirements of different presses. The independent adjustment of the tapes may be readily effected by manipulation and the number of alined tapes provided clearly evidences the enormous range of selectivity for dete r mining varying amounts of moisture crosswise of the press which it may be desired to establish to realize the intended benefiting control. The endless composite tape 51, or that portion of it which conducts water from the reservoir 35, to the member 39,, is in effect a siphon, as it carries the water from the reservoir to a point, outside of the reservoir, at a level lower than the top of the liquid in the reservoir. 3 1

Figure 4 is intended clearly to exemplify the application of the principle of my invention, and in viewing it the laterally extending portion, in which it appears in Figure 5,

ing row of five numerals from 04 inclusive are to be considered as corresponding in sequential order to the five segmental sections 52, 53, 54, 55 and 56, indeed, each tape preferably has such numerals marked thereon to aid the operator to quickly perceive the location of each. Figure 7 reveals the two sections 55 and 56 so marked with the numerals 3 and 4. Inspection of Figure 4 will show the lateral margins of the press or ends of the dampening rollers to be bounded by vertical planes represented by lines 57 and 58. Inwardly of the lines 57 and 58, lines 59 and 60similarly represent vertical planes determining the lateral boundaries or width of a paper sheet. The margins 61 between the lines 57 and 59 and between the lines 58 and 60 represent portions of the press not being used or not co'vered by paper which is required to absorb some and usually a varying degree of moisture. The uncovered margin 61 will not require the deposition of any moisture and the two separated rows of nine zeros, extending across each, are intended to evidence that the seven tapes, which are disposed within the boundaries of each of the margins 61, have been adjusted to the position illustrated in Figure 5 where the zero section 52 of metal extends over the edge of the auxiliary water pan so as to preclude exercise of capillarity. Bordering each of the uncovered margins 61 are two strips 62 representing half-toned areas or typed areas which will require some, but not the greatest amount of moisture. extending across the strip 62 in the direction toward the middle, are three numerals 1 and next three numerals 2 to thereby indicate that the next six adjustable tapes on each side have been so adjusted that the first three have the section 53 extending over the front rim of the auxiliary water pan 35 The section 53 (actually marked with the numeral 1) being the thinnest of the four water absorbing sections will cause the least amount of moisture to be drawn from the pan 35 for transference to the wiper 39 and thence to the water roller 16. The three numerals 2 are likewise intended to show that the next three tapes have their sections 54 which are of somewhat greater thickness on duty or functionatin to transfer moisture by capillary attractlon. The reason for showing both numerals 1 and 2 extending across the half-tone area 62 is because it is thought preferable to suggest the possibility of a more gradual transition from one degree of water transference to another. It should be understood, however, that it might be preferred to have four or five numerals 1 adjacent the nine zeros and accordingly only two or one numeral 2 respectively within the lateral confines of the strip 62, indeed, the next numeral 3 prior to the series of four numerals 4 evidences such a selective variation. The six It will be noticed that numerals 4 extend mainly across each of two interjacent heavy or solid color areas 63 where the most moisture is expectably to be desired and which the thickest section 56 and represented by the numeral 4, is adapted to accomplish when brought to its functioning position with one end immersed in the water in the pan 35 and its other end in contact with the wiper 39, because of the gravitational pressure of the latter of the combined /hangers 45, rod 46 and spools 47. The middle strip or area 64 which denotes a light color or strong half-tone will probably be adequately supplied with moisture by use of the section 55, designated as appears in F igure 7 by the numeral 3.

It is to be remembered that since Figure 1 is a plan view looking downwardly upon the entire row of composite tapes, the rows of numerals there appearing will not correspond to the row of numerals in Figure 4, because in looking downwardly upon the composite tapes the numerals designating the two upper sections which are not functionating appear to view. For iiistance, to consider the composite tape at the left end in Figure 1 where the numeral 2 appears above and the numeral 3 below, which is to say, the numeral 3 will be nearest the operator, that particular composite tape furthest to the left happens therefore to have the locationsof its sections corresponding with the relative locations of the sections in Figure 5 and in Figure '7, so that the zero section 52 is in its watertransferring obstructing position. It is be cause the operator is facing toward what is known as the front of the machine that the numerals 0, 1, 2, 3 and 4 appear in reading alinement as viewed from the left margin of sheet one and hence upside down if Figure 1' be viewed from the opposite margin of the sheet in the customary manner. The numerals l and 2 appear inverted in Figure 6 for the same reason, or to insure that they will legibly appear to the operator during his manual adjustments. To consider one other particular group of adjustments, it will be observed, upon inspection of Figure 4, that the middle light color or strong half-tone strip area has been indicated to be receiving such an amount of moisture as the section 55, which is actually marked with the numeral 3, is designed to transfer by capillary attraction by reason of extending over the front rim of the auxiliary water pan 35. Shifting scrutiny to Figure 1 and with consideration of the adjacent series of composite tapes which extend across the width of the middle area 64, it is there observable that seven tapes are adjusted alike and that such seven tapes, in order to correspond with the diagrammatic showing of Figure 4, have their sections .55 in functionin position and therefore would show from a ove seven number 1 sections nearest the operator and seven zero sections forwardly beyond, which is to say, above, as shown in Figure 1.

Operation It will be realized that as soon as the press is started the operation of the pump 27 will commence whereby water is continually supplied to the upper or auxiliary water pan 35 where its level is maintained by the overflow pipe 36 which discharges into the lower pan 21 from which it overflows through the tube 23 back into the main reservoir 24. All skilled printing involves, at least initially, the cut and try procedure until the best combination of adjustments for good work have been effected. Such adjustments involve the frequency of bodily swing of the dampening duct, roller 14, the determination of elevation of the entire row of composite tapes through the agency of the lock nuts 41, selection as to length and thickness of the wiping apron 39 and multiple selectivity of adjustment of the composite tapes, singly or in groups, according to a skilled determination of the requirements for achievement of a perfect job. The rapidity of rotation of composite tape carried structure has the rollers precludes a merging toward equalization of the varying degrees of moisture existing in the wiping apron 39, from oneside of it to the other, and consequently such variations are substantially maintained as annular rings or zones on the water roller 16, on the dampening duct roller 14, on the brass roller 13, on the dampening rollers 12 and on the plate cylinder 10. Any slight I marginal equalization may be readily and/or compensatingly controlled by the interpositioning of a single distinct tape adjustment, as, for instance, that evidenced by the numeral 3 between the numerals 2 and 4: at the bottom of the right marginal line of that heavy or solid color 63 which is furthest to the right. a.

The views on Sheet 4 pertain to simplified modifications. All the parts in Figure 8 which are identical with the corresponding parts previously described, are supplied with the same r ference numerals, and the water roller 16 is shown covered with cloth 65 and instead of the longer rods 31, somewhat shorter, but otherwise equivalent, rods 66 are employed, since, according to this form the een omitted. In substitution for the tapes I provide any desired number of clips 67 which may be of stamped metal to include handles 68 alon their tops. The clips are all of bifurcate. form to enclose arched absorbent material 69, the two edges of which are curled outwardly around the lower edges of the clips where they are stitched thereto, as indicated by the numeral 70. The manner of effecting attachment at this point is of no particular consequence and manifestly might be otherwise accomplished. The two extensions of the clip 67 are spaced far enough apart to readily straddle the combined thickne'ss of the forward wall of the auxiliary pan 35 and of the wiping apron 39 with its attaching screws 40, so that the clips may be suspended and readily adjustably moved crosswise in any desired arrangement as a row. Manifestly, the less width the clips 67 have, the greater the number which may be gravitationally carried as a crosswise extending row. It will be observed that the rearward ends of the absorbent material 69 are immersed in the water in the pan 35,

whereas their forward ends bear against the apron 39. According to this form, a clip will be entirely omitted between those vertical planes which define longitudinal strip areas, like 61, where it' is not desired to have cise the function of the apron 39 by rubbing engagement with the cloth 65.

I claim 2- I 1. Means for dampening in printing upon sheets carried upon a lithographic press, comprising a water reservoir, a roller, an appliance including a composite element adapted by capillarity to transfer moisture from said reservoir to said roller, and means for adjusting said element whereby to vary its function of utilizing capillary attraction.

2. Means for dampening in printing upon sheets carried upon a lithographic press, comprising a water reservoir, a roller, 9. plurality of appliances each including a composite element distinct portions of which are adapted by capillarity to transfer varying amounts of moisture from said reservoir to said roller, and independently operable means for selectively adjusting said elements respectively to bring chosen portions thereof to their functioning positions.

3. Means for dampening in printing upon sheets carried upon a lithographic press, comprising a moisture receiving element and a plurality of moisture-conveying units arranged to extend crosswise of the press and adapted to gravitationally convey water to the top of said receiving element and means whereby the functioning ofsaid units may be separately controlled.

cans for dampening in printing upon ture-conveying units arranged above said roller, so as collectively to extend across the path of movement of said sheets and means for controlling the functioning of certain of said units.

5. In a dampening device of the character described, the combination of a Water reservoir, a roller and appliances including siphon elements for transferring water from said reservoir to said roller, parts of said appliances being independently adjustable.

6. In a dampening device of the character described, the combination of a frame, a water reservoir carried by said frame, rollers mounted on said frame, appliances comprising capillary elements arranged in a row across said frame and adapted to transfer water from said reservoir to said rollers, said appliances including independently adjustable elements whereby to vary their water transferring function.

7. In a device of the character described, the combination of a water roller a plurality of auxiliary water feeding appliances extending in a row above and axially along said roller and a water-transferring connection between said appliances and the upper surface of said roller.

8. In a device of the character described, the combination of a water pan, a water roller immersed in said pan, an auxiliary water pan above the first mentioned pan, a plurality of auxiliary water feeding appliances carried in a row across said auxiliary pan, a water conductor contacting the upper side of said roller and adapted to receive Water from said appliances.

9. Incombination, a water reservoir, and an appliance including a water-absorbing element extending over an edge of said reservoir and depending inside and outside thereof, said appliance adapted to conduct water from sa1d reservoir by capillary attraction, and a water carrying roller to receive water from said appliance.

10. In combination, a water reservoir, and a plurality of adjustably mounted appliances each including a water-absorbing element extending over an edge of said reservoir and depending inside and outside thereof, said appliances adapted to conduct water from.

said reservoir by capillary attraction, a water-carrying roller and an absorbent element contracting said roller and arranged to receive Water from said appliances. 7

11. In combination, a water-transferring member, a source of water above said member and a plurality of water-dispensing appliances comprising siphon elements adapted to receive water from said supply and deliver it to said member.

12. In combination, a water-transferring member, a source of water above said-memand a plurality of water-absorbing elements adapted to receive water from said supply and deliver it by eapillarity to said member.

13. In combination, a water roller, a source of water above said roller, and a contrivance including a plurality of water dispensing elements adapted to receive Water from said supply and a member for transferring it to said roller, said elements being adjustable relative to the axis of said roller.

14. In combination with a lithograph press, a water roller, a water reservoir, a plurality of endless moisture transferring structures immersed in said reservoir and extending in a row outside of said reservoir, said structures including elements shiftable to alternative positions so as to be capable of transferring varying amounts of water, and an apron contacting the periphery of said roller and adapted to receive the Water transferred from said elements.

15. In combination with a lithograph press, a water roller, a source of water supply, a plurality of endless moisture transferring structures, said structures including elements adapted to receive and conduct water from said supply turnable to alternative positions, and composite endless tapes including sections of varying thicknesses of absorbent material adapted to transfer varying amounts of water toward the periphery of said roller.

16. In combination, a water reservoir, a water distributing member and a flexible appliance including a Water absorbing element extending over an edge of said reservoir and depending inside and outside thereof, said appliance adapted to conduct water from said reservoir to said distributing member, and means for maintaining said appliance taut.

17. In a dampening graphic press or the llke, in combination, a water pan, a roller partially immersed in said pan, an auxiliary water pan, and controllable means for transferring liquid from said auxiliary pan to said roller.

18. In a dampening device for a lithographic press or the like, in combination, a water pan. a roller partially immersed in said pan, an auxiliary water pan, and controllable means for transferring liquid from said auxiliary pan to said roller, said auxiliary water pan being provided with an overflow adapted to discharge into said water pan.

19. In a dampening device for a lithographic press or the like, in combination, a water pan, a roller partially immersed in said pan, an auxiliary water pan, controllable means for transferring liquid from said auxiliary pan to said roller, automatic means for supplying liquid to said pans and means for maintaining the water level in said pans substantially constant.

20. In a dampening device for a lithographic press or the like, in combination, a source 0 liquid, a liquid receiving roller, a

device for a litholiquid transfer device; said liquid transfer device comprising a liquid feeding element and aliquid distributing element, said liquid feeding element being adapted to feed liquid from said source to said distributing element, and said distributing element bein adapted to distribute said liquid to said rol er.

21. In a dampenln graphic pressror the li e, a roller, meansfor substantially uniformly coating said roller with a predetermined amount of liquid and means for adding liquid to said coating.

22. In a dampening device, in combination, a roller, means adapted to supply a substantially uniformly distributed coating of liquid to said roller, and a plurality of devices each adapted to independently add liquid to said coated roller, and means adapted to regulate the amount of liquid added.

23. A dampening device for use on a lithographic offset press or the like, comprising a roller whose periphery is partially immersed in liquid and means adapted to add liquid to the upper portion of the periphery of said roller. f

24. In a dampening device, a rotatable roller whose periphery is partially immersed in a liquid reservoir, and means adapted to add liquid to the periphery of said roller, after said periphery has emerged from the liquid reservoir and before it re-enters the same.

25. In a dampening device, a rotatable roller whose periphery is partially immersed in a liquid reservoir, and a plurality of devices each adapted to independently add liquid to the periphery of said roller.

26. In a dampening device for use on a lithographic ofiset press or the like, in combination, a water roller whose periphery is par- .tially immersed in liquid, a ductor roller adapted to contact said water roller, and means adapted to add liquid to the periphery of said water roller at a point between the line of emersion of the periphery of the water roller from theliquid and the line of contact of the ductor roller with this periphery.

Signed by me, this 28th dlaly of May, 1928.

JOSE]? SCHULTZ. A

device for a litho-

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