DE2916048A1 - PRINTING MACHINE AND INKING UNIT FOR A PRINTING MACHINE - Google Patents

Description

Our mark Our ref. D 1659

Harold Phillip Dahlgren _f 3305 Manor Wäy ,. Dallas, Texas 75235, (V.St.A.)

Printing machine and inking unit for a printing machine

The invention relates to a printing machine in which the color is applied to a printing plate, which an image on a transferring fluid-absorbing material.

The invention further relates to an inking unit for the selective and uniform application of a liquid newspaper printing ink or the like. existing color film on a printing plate a printing press.

Inking units for printing plates which have found acceptance or entry on the market generally have two to four forming rollers arranged to be in rolling engagement with a printing plate. Each of the forming rollers

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Bremen / Bremen Office: Postfach / P. O. Box 10 71 Feldstrasse 24, D-2800 Bremen Telephone: (0421) * 7 40 44 Facsimile / Telecopier: Rank Xerox Telegr. / Cables: Diagram Bremen

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Könffin / AccbuinsT3re "mi Bremer Bank, Bremen (BLZ 290 80010) 1001449 Deutsche Bank, Bremen (BLZ 290 700 50) 1112002 PSchA Hamburg (\\\ 7 ,? Np! No 20) 1260 81-202

Munich Office:

P.O. Box / P. O. Box 14 0108

Schiotthauerstraße 3

D-8000 Munich 5

Telephone: (089) 65 23 21

Telegr. / Cables: Tclcpalent Munich

Telex: 523 "" 7 in. "= D (rode: forbo)

BOEHMERT & BOEHMERT

is usually in rolling engagement with one or more oscillating rollers, which paint over a large number of Rollers or rollers fed in a roller or roller train of rollers or rollers of different diameters which are arranged in the manner of a pyramid. The color is fed to the roller train via a ductor roller, which is oscillatingly brought into and out of engagement with a paint film held by a flexible doctor blade is formed, which is pressed against the hard surface of an ink roller, which is immersed in an ink pan, namely by means of a large number of suitable pressing means (ink keys).

The ink film that is formed on the ink roller immersed in the ink reservoir is too thick and unevenly to be applied directly to the printing plate during quality printing. The printing machines with the above indicated inking units, which contain a large number of rollers or rollers, are intended to reduce the thickness of the ink film and form a film of uniform thickness on the printing plate. But since the color film is on each of the rollers or rollers is not completely refreshed with each revolution of the respective forming roller becomes, the well-known adverse phenomena such as ghosting, an accumulation of color and a lack of Color not completely eliminated. This in turn has the consequence that streaking and uneven Color distribution occurs, not only on the rollers, but accordingly also on the printed product, namely due to the disadvantages described above such as ghosting and color accumulation.

Machines with inking units that contain so many rollers or rollers require very complex drive mechanisms and accordingly are extremely expensive not only in terms of their investment costs but also in terms of their maintenance

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and expensive.

In printing machines with other inking units, attempts have been made to transfer the color from a transfer roller to a form roller and a doctor's blade has been used to dispense all of the film of recycled paint from the forming roller remove before the color film is refreshed or renewed. Since most of the forming rollers are elastic rollers, i.e. rollers with an elastic surface are formed, it occurs due to the constant contact of the Doctor's blade with the surface of the relevant forming roller to corresponding signs of wear of the blade on the one hand and the roller on the other hand, which also results in uneven ink film thickness.

The present invention addresses the problem of one thin film of paint such as that used for newspaper printing, i.e. a paint with a low viscosity, to form a film of substantially uniform thickness on a forming roller, then this color film is to be moved in contact with the image section of the printing plate, while avoiding the roller or Roller trains in the inking unit, as they have been described above with regard to the prior art. At the same time the requirement of consuming relatively large amounts of energy can be eliminated. Furthermore, the numerous The settings required by the state of the art are eliminated or at least considerably reduced, and above all, there should not be any sections where ghosting or color accumulations occur that like Already mentioned above, cause undesired changes or irregularities in the printed product at all.

Devices according to US-PS 39 26 114 have been developed to remove all unused dye and dampening liquid sections

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from the forming roller before a new ink film is formed by passing the ink through a gap between the forming roller and a transfer roller is metered or dosed. However, this occurs when such a Device on both the blade and the roller a very considerable wear. It is also extremely difficult to form a color film with this known device, which is sufficiently thin by a doctor blade to Dosing of newspaper ink is used.

Printing machines or inking units according to US Pat. No. 2,240,762 provide rollers, the surface of which is provided with indentations, to dose ink onto a forming roller and then transfer it to a printing plate.

A printing unit generally contains two printing stations for applying ink to the web to be printed. If it if it is desired to print the web on both sides in a single printing unit, the web is so made by the printing unit led that color is applied to both sides. If so desired, however, two colors in the same To apply pressure unit to one side of the web, so must -. one of the two printing stations can be reversed from the '■ Direction that is used to print on both sides of the web, and the web is then used for one-sided purposes Pressure through the machine. Reversing or reversing a printing station also requires one Reversal of the rollers or cylinders of this printing station.

The present invention is accordingly based on the object of creating a printing press with an inking unit by means of which or which continuously an essentially uniform ink thickness is to be produced on a forming roller, especially in a lithographic printing system. The aim is to control the thickness of the color film very precisely

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to prevent ghosting and corresponding color changes in printed images.

In addition, when using the low-viscosity paint in question here, not only a paint film of essentially uniform thickness can be created, but also a color film that accepts wet liquid easily and gladly, to be applied to a printing plate, whereby reversing should also be possible.

The subject matter of the invention is also intended to be compared with the prior art be simple and efficient and during operation - compared to comparable known Vorrich - use relatively little power.

Finally, the printing press should only have a single control point with regard to the ink thickness with regard to the inking unit have what prevents stripes and irregularities, which can arise due to lint, paper particles, etc.

Last but not least, the set-up time for setting the color film should be reduced to a minimum.

The inventive solution to this problem and expedient Refinements of the basic solution are described in the claims.

The printing press according to the invention accordingly has an inking unit with a metering means such as a metering roller and a transfer roller, each having an oleophilic surface wherein the surfaces are engaged with each other under mutual pressure. The dosing roller doses you Excess of low-viscosity paint at the gap between the metering roller and the transfer roller, so that a uniform

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moderate film dosed on the surface of the transfer roller will. An ink supply roller cooperates under pressure with the transfer roller / in order to further feed the ink film Condition and ensure that the film is substantially uniform and continuous. The color film is then divided and metered between the gap between the transfer roller and the forming roller. By controlling the speed between the forming roller and the transfer roller, slippage occurs so that a substantially uniform, calendered, smooth paint film is formed on the surface of the forming roll.

Since an uneven film of color from the printing plate ■ Moved onto the forming roller, it combines with a fresh, even color film from the transfer roller and forms a substantially uniform ink film on the form roller by removing ink from the transfer roller is removed to refresh the "starved" sections on the forming roll. The transfer roller ensures continuous for an even ink film on the form roller, and the irregular or uneven Return film, which is formed when the forming roller removes ink from the metering roller, moves back to the "flooded" gap between the metering roller and the metering roller in order to be metered or metered again there will. The ink film on the form roller is further conditioned by a conditioning roller to produce a smooth, matt finish Finish to form on it. The conditioning roller has essentially the same affinity for paint as the forming roller and splits the film accordingly, which results in a matt finish of the paint layer.

The matt finish is particularly suitable for dampening liquids record in a lithographic printing machine. A dampening liquid system has an over-

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transfer roller with hydrophilic surface and a metering roller and transfers dampening liquid to the matt finish the color on the form roller before the inking and dampening liquid layer comes into contact with the pressure plate. The color and water film is applied to the image sections of the printing plate, and the dampening liquid is also applied to the unimaged portions transferred so that lithographic printing can be carried out.

After the ink layer on the form roller moves away from the printing plate, there are "ghost sections", ie sections with little ink _x , which are reduced by an ink supply roller, this roller collecting ink and supplying those sections with it where ink has been removed before the ink layer moves into the gap between the form roller and the transfer roller in order to refresh the partially depleted ink film.

The inking unit and the dampening unit are in a special way for it suitable to be reversed so that the wet liquid is applied to the forming roller and the paint is then applied over it. This allows a reversal of the entire unit, if so desired.

This type of printing machine or inking is especially for this Suitable for applying newspaper printing ink in coloring processes, such as those used as Di-Litho (registered Trademarks of the American Newpaper Publishers Association "Research Institute") are known to direct to print with water on a lithographic plate in order to print with water offset from a blanket cylinder, to carry out stereotypical letterpress printing, to carry out dry offset printing, and to do an immediate one To carry out letter printing with a letter printing machine with a plastic plate.

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The invention is based on preferred embodiments below further explained with reference to a drawing. It shows:

Fig. 1 is a schematic representation of the inking unit according to the invention, showing the various Shows stain and wet liquid films;

Fig. 2 is a side plan view of the metering roller, the transfer roller and the support structure ;

FIG. 3 shows a sectional view in the direction of section line 3-3 in FIG. 2; FIG.

4 shows a schematic representation of a standard printing unit;

Fig. 5 is a schematic representation of a reverse or counter-working Pressure unit; and

6 shows a schematic representation of the circuit diagram of the motors of the dampening and inking units .

Identical or identically acting parts are provided with the same reference symbols in the individual figures of the drawing.

In Fig. 1 of the drawing, the reference numeral 1 denotes a paint application device, by means of which ink and dampening liquid is to be applied to a lithographic printing plate of a printing machine. In which Application means for applying water is a dampening unit 200 of the type as "he is in the on U.S. Patent 3,937,141 "DAMPENER FOR LITHOGRAPHIC PRINTING PLATES" issued February 10, 1976 to Harold P. Dahlgren is shown and described. The disclosure of US Pat. No. 3,937,141 is incorporated herein by reference fully introduced to their entire content.

As can best be seen from Fig. 2 of the drawing, has

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the paint application device arranged at a mutual distance Side frames 2 and 4, which are connected by (not shown) connecting struts and a high-strength Construction for mounting or supporting a forme cylinder or a form roller 90, an ink transfer roller 10, an ink metering roller 12 and an ink pan 14. at the side frames 2 and 4 can be side frames of a printing press, or also side frames of a Inking units that are to be connected to the side frame of a printing press.

Steep connecting links 16 and 18 are formed by stub shafts 20 and 22 articulated to the side frames 2 and 4. Parking cylinders 24 and 26 are articulated between the side frames 2,4 and the parking connecting links 16, 18 arranged to the parking connecting links 16, 18 around the To pivot stub shafts 20, 22 and to bring the ink transfer roller 10 into position, as detailed below is discussed for thereby applying ink to a form roller of a lithographic printing machine.

A skew arm 28 is provided to a To pivot the end of the metering roller 12 about the axis of the ink transfer roller 10. As shown schematically in FIG is, the tilt arm 28 is rotatably attached to a stub shaft 30 which is adjacent to a End of the ink transfer roller 10 between the link 18 and the tilt arm 28 extends.

The inclination arm 28 and the parking link 16 have grooves 28a and 16a, respectively, in the inside thereof are formed, in which blocks 36 are slidably arranged which carry self-aligning bearings 38. Blocks 35 are fixedly arranged in the upper section of the grooves 28a and 16a by means of screws 37 in order to

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To provide support for shafts 31 and 32 of the ink transfer roller. Suitable means such as elastic Springs 40 between blocks 35 and 36 urge blocks 36 longitudinally towards the skew arm 28 and the parking link 16, in a direction away from the longitudinal axis of the ink transfer roller 10 is. A pressure adjustment screw 42 pushes the block 36 along the pitch arm 28 and the parking link 16 against the restoring force of the springs 40. Stub shafts 44 and 46, which are from the opposite Ends of the metering roller 12 extending outwardly are held in self-aligning bearings 38 to the metering roller 12 rotatable in pressure system to the transfer roller 10 to keep. Stub shafts 31 and 32 extending from the opposite ends of the transfer roller 10 extend outward, are mounted in the blocks 35 in bearings 39.

It can be seen that rotation of the pressure adjusting screws 42 moves the opposite ends of the metering roller 12 relative to the axis of the transfer roller 10 in order to control or adjust the pressure between the transfer roller 10 and the metering roller 12.

As can be seen from Fig. 3, a suitable means is provided about a desired relative angular position between the sloping link 18 and the pitch arm 28 cease and maintain. In the embodiment according to FIG. 3, an adjusting screw 50 is rotatable on the inclination arm 28 and extends through threaded holes in pivotable blocks 52a and 52b. The blocks 52a and 52b are pivotably arranged on an extension 54 of the arm 28 and an extension 56 of the connecting link 18, respectively. The adjustment screw 50 can be used to adjust the distance between the shoulders 54 and 56 in order to

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arm 28 relative to link 18 about shaft 30 to move.

The side frames 2 and 4 are provided with suitable adjustable means for limiting movement, such as the stop blocks 5 shown in the exemplary embodiment Adjustment screws 5a which extend through the stop blocks 5 to engage the lowering links 16 and 18 to come into engagement when the piston rods of Steep cylinders 2, 4 and 26 are extended, in order to achieve a desired relative pressure between the transfer roller 10 and to erect an ink coated form roller 90 which is arranged to apply ink to a lithographic or relief printing plate 112 to be transferred to the plate cylinder P, as will be explained in detail below. Limiting means like stop blocks 6 with adjusting screws 6a are attached to it, and create a limitation in the parked state, when the piston rods of the parking cylinders 16 and 26 are retracted to the transfer roller 10 of the surface of the forming roll 90 away. The stub shaft 32 has a disc brake 51 attached to it is. Friction pads or pads 53 are pivotally attached to a support 55 which is attached to the arm 28 to the Control the speed of the transfer roller 10 when it is driven by frictional engagement with the forming roller 90.

Which extends from the end of the transfer roller 10 outward extending stub shaft 31 has a gear 60 which is fixed by means of a screw 61 on it and with meshes with a gear 62 which is rotatable on the shaft 44 by means of a bearing 45.

The gear 62 is in mesh with a gear 64 on a shaft 58, which is driven by a clutch 66, for example of the Type of a Morse one-way coupling rotatable with the side

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frame 2 is connected. The shaft 58 is attached to the shaft of a reversible variable speed drive, for example a reversible, variable-speed electric geared motor 69. It can be seen that the gear motor 6 9 by other drive means, such as gears or gears, chain wheels Or chain drives, belt drives or the like., Could be replaced, which are driven by the drive of the printing press be, and in such a case preferably via a transmission or a similar device, by means of which the To vary or control speed.

Which extend from the end of the metering roller 12 to the outside de shaft 44 has a gear 70 which is mounted thereon and with a gear 71 is in engagement, which on the Shaft 58 is attached and is driven by this.

A connection line 80 is connected to the terminals of the motor 69 via a variable resistor 84, so that the motor can run at different speeds around the rotational speed and accordingly the surface speed to control the transfer roller 10 and the metering roller independently of .dem printing machine drive. if it If desired, the motor 69 could be replaced with a variable speed clutch which engages the shaft 58 connects to the printing press drive, as described above.

The clutch 66 allows the transfer roller 10 to be driven by the gear motor 69 with a minimum speed ratio relative to the metering roller 12 den, for example in a ratio of 1: 1, and allows the transfer roller 10 through the forming roller 90 with higher Speeds to be over-driven without starting the metering roller 12 at a faster speed.

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to drive, resulting in an ejection of color 14a from the color * - tub 14 could lead.

It can be seen that the clutch 66 could be replaced, for example, by a gearbox which enables it is to positively drive the transfer roller 10 by the geared motor 69, or the clutch 66 can be blocked or blocked. be locked to reverse movement of the ink transfer roller 10 to enable. The clutch 66 can be reversed by removing it and reversing on the Shaft 58 is placed, if this is desired.

In the case of the ink storage rollers shown in FIG rollers) 82 and 82 'are preferably oscillating rollers. The ink supply rollers 82 and 82 'can remove portions of excess ink on the transfer roller 10 in a manner equalize, as will be explained below.

Rollers 82 and 82 'are preferably positive through Roller 10 driven, i.e. by gears which in turn are driven by a gear on roller 10.

A suitable means is provided for an ample supply of paint to the paint metering gap N between the adjacent ones Surface or surface sections of the transfer roller 10 and the metering roller 12 to bring. In the exemplary embodiment according to the invention according to FIG. 1, dips a surface portion of the metering roller 12 into the ink 14a of the ink pan 14.

The color 14a is preferably a color with a relatively low viscosity, for example a color such as is used for coloring raised image sections in letter printing machines, or as used as color for a direct or offset lithographic Printing is used.

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The transfer roller 10 is preferably made hard. Their outer surface can be smooth or textured and is color receptive or oleophilic. The ink transfer roller 10 can accordingly on its outer Surface made of materials such as copper or plastic. The surface of the transfer roller 10 can be either hard or resilient, depending on the properties the surface of the forming roll 90. If the forming roll 90 has a hard surface, the surface is the transfer roller 10 is preferably hard.

The metering roller 12 preferably has a hollow, tubular sleeve with stub shafts formed thereon 44 and 46. A resilient coating 12c is drawn over the outer surface of the socket. That The material of the metering roller 12 is chosen so that it is oleophilic, the surface being smooth or textured can be.

In order to reduce the tendency for the ink to collect or collect adjacent the ends of the transfer roller 10. build up, the metering roller 12 is longer than the transfer roller 10, so that the ends of the Metering roller 12 extend beyond the ends of transfer roller 10. The transfer roller 10 is preferably longer than the forming roll 90 to avoid excessive build-up of paint on the ends of the forming roll 90 to minimize.

It can be seen that the materials of the transfer roller 10 and the metering roller 12, if desired, can be reversed or mutually exchanged, see above that the metering roller 12 then has a hard surface

BOEHMERT & EOEHMERT

sits and the transfer roller 10 is an elastic Coating. Both surfaces could also be elastic.

The forming roller 90 is preferably designed so that it has the same length as the pressure plate, in order to eliminate an accumulation of superfluous color here as well, which would then or could be the case, if the form roller 90 were longer than the pressure plate.

As can be seen from Fig. 1 of the drawing, the transfer roller 10 is preferably under pressure on the Forming roller 90, which has a tubular core 91 made of metal, at the ends of which are stub shafts are attached, which extend outwardly and are rotatably supported in bearings 92, which of the Side frames 2 to 4 are held.

The forming roll 90 has a smooth outer coating 96, which can be designed to be non-absorbent or absorbent, hard or soft, depending on on the type and construction of the pressure plate 112.

In one embodiment, the forming roll 90 can have a resilient, non-absorbent surface. In another embodiment, the forming roller 90 has a resilient surface and is colored absorbent and wet liquid repellent cover, as it is for example in the embodiment has become known from Molleton. However, the pressure plate 1-12 has raised portions and is made of elastic Material, the forming roller 90 could have a hard surface, for example made of copper or a hard, be provided with a thin plastic coating.

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An ink supply roller 94, which is preferably designed as a ^{vibrating roller, can remove ink from sections 128 1} 'of the ink film 128 on the surface of the forming roller 90 and supply ink to the sections 128' cleared of ink, whereby a uniform ink film on the surface of the roller 29 moving from gap 120 to gap 108.

A second ink supply roller 94 "which is similar to the roller 94 is configured is between the plate cylinder P and the dampening unit 200 are arranged to smooth the ink film when the inking roller 90 is reversed, as further is described below.

A conditioning roller 86, which is preferably designed as an oscillating roller, is rotatable on a shaft 86a supported in blocks 86d around the surface of the paint film 100 to condition and smooth and in this way the film more receptive to the wet liquid close. Screws 86b and 86c keep blocks 86d and roller 86 in pressure engagement with forming roller 90 bring. The surface of the conditioning roller 86 is preferably made of a material similar to that of FIG Forming roller 90 so that the surface has the same affinity for color as the surface of forming roller 90.

When the ink film 100 exits the gap 106 between the form roller 90 and the transfer roller 10, it is sized and calendered. Such a color film is not particularly receptive to damp liquid, because the surface tension of the color molecules creates the thin layer of dampening liquid to be applied by the dampening unit 200 can reject. The conditioning roll 86

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receives part of the color film 100 and accordingly divides the color film 100 to be one film 100 'is produced on the roller 86 and leaves a film 100a with a matt finish which has microscopic depressions. This finish of the film 100a leads to the fact that the thin Layer of moist liquid is absorbed more easily than correspondingly due to molecular attraction the surface tension of the wet lime that forms a film 217.

The conditioning roller 86 and the ink supply rollers 94 and 82 are preferred for their diameter designed such that the rotating paint is properly applied or applied to the surface of the roller 90. is distributed.

The oscillating rollers 82, 86 and 94 are preferably provided with drives (not shown) with which the rollers are to be moved back and forth in the longitudinal direction. Suitable drives for such oscillating rollers are known in the art well known, so that a detailed description does not seem necessary. One twist each of these rollers is provided by frictional engagement with adjacent surfaces.

The dampening unit 200 is shown schematically in FIG. 1. It includes a hydrophilic transfer roller 210 a shaft 210a and an elastic metering roller 212 on a shaft 212a, the arrangement being similar is taken according to the inking unit 1, as described in US-PS 39 37 141. The metering roller 212 doses liquid 214a from a tub 214 onto the transfer roller 210 via a flooded gap Na.

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The water film controlled by the pressure between rollers 210 and 212 forms a thin layer of dampening liquid 204 passing through a wet liquid transfer gap 106a onto the matte-finished paint film 100a on the surface of the forming roller 90 is dosed.

The dampening liquid metering roller 212 is of a reversible motor 260 driven, the speed of which is variable. As shown in Fig. 6, are resistors 84 and 2 84 connected to a suitable electrical network and are also connected to a pair of Double poles of double switches 81a and 81b connected, to control the direction of rotation of motors 69 and 2 69.

The working and functioning of the device described above is as follows:

The pressure between the ends of the transfer roller 10 and the metering roller 12 is controlled by the rotatable pressure adjusting screws 42 set.

Since long rollers resting against one another under pressure tend to bend or sag, the Pfcuck near the middle areas of such Roll less than near their ends. The pressure over the longitudinal direction of the rollers 10 and 12 is through turning the adjusting screw 50 and turning or pivoting the tilting arm 28 about the axis the transfer roller 10 is set in a position in which a desired pressure distribution over the length of rollers 10 and 12 is reached.

The adjusting screw 5a is positioned to work with the

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Absteil links 16, 18 engage come and set a desired pressure between the transfer roller 10 and the forming roller 90.

The surface speeds of rollers 10 and 12 are, as described above, adjustable by manipulating the resistor 84.

The dampening unit 200 is set in a manner similar to that of the inking unit 1.

In order to show the new function and the results of the process or the working method in a graphical way, as has been described above with reference to the drawing, Fig. 1 shows a schematic representation of the metering roller 12, the transfer roller 10 and the forming roller 90. Both the dye and the water films are clearer for the purpose of this Representation and illustration drawn in exaggeratedly large.

As can be seen from Fig. 1, the metering roller is for the purpose of applying ink to the printing plate preferably designed as a roller with an elastic surface, which has a smooth surface 12c, and its lower section in the color 14a of a paint tray 14 immersed. The metering roller 12 rests against the transfer roller 10 under pressure. The pressure between the adjacent surface portions of the rollers is in the manner described above by the Screw 42 adjusted so that the surface of the transfer roller 10 into the surface of the roller 12 is pressed in on the paint dispensing tray N. When the surface

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the roller 12 in the direction of the ink metering gap N rotates between rollers 10 and 12, a relatively thick layer of paint 101 is picked up and applied to the surface of the roller 12. At the point of contact in the paint metering gap N between the Rollers 10 and 12 form a color bead 102 which forms an excess of color. The size of this the excess color forming the color bead 102 is regulated by the fact that the excess color due to the action of gravity flows back into the paint tray 14 or falls back, so that there is a backflow of paint in the manner of a "waterfall". Also will the excess ink present there is controlled by the surface speed of the metering roller 12. Of the Ink bead 102 represents an ink reservoir from which ink is taken from the transfer roller 10. There the rollers 10 and 12 rotate under mutual pressure, a layer of paint is between the two adjacent surfaces or surface sections of the two rollers divided and / or metered, which is separated by a thin paint smear layer 103. Since the transfer roller 10 has a smooth, oleophilic surface a part of the film 103 adheres to the surface of the roller 10 and forms a film 104a there. The remaining part 105 is rotated back or fed back into the paint tray 14. The paint film 104a is on the surface of the roller 10 due to the rotation, the squeezing action between the rollers 10 and 12 and their tangential point of contact at the ink metering gap N. The ink supply roller 82 splits the film 104a and receives a film 104 ', which is added to the film 104a to again or continue a uniform Thickness of the film 104 on the transfer roller 10 to ensure.

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The ink film 104 moves on and with the surface of the roller 10 and then comes into contact with the Ink film 130 on ink form roller 90 at the point of contact or ink transfer nip 106 between the transfer roller 10 and the form roller 90.

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At the ink transfer gap 106 it can be observed that the transfer roller 10 is in the elastic surface of the Form roller 90 presses in, and that the ink film 104 has an outer side 108 which contacts the ink film 130, as well an inside 110 adhered to the surface of the roller 10. The outside 108 of the film 104 and the outside 131 of the ink film 130 on the forming roller 90 are compressed and form a hydraulic connection between rollers 10 and 90 when in close relation to one another rotate. However, there is no physical contact between the surfaces of the two rollers.

It is an important fact that the relatively thick ink film 104 in rolls 10 and 90 allows for different ones Surface speeds to be rotated, as will be explained below.

Preferably, the forming roll 90, which is normally associated with the is rotated the same speed as the printing plate 112 and is driven by the printing machine, with a Rotated greater peripheral speed than the surface speed of the roller 10. By regulating the differential speed between the transfer roller 10 and the application roller 90 can the applied to the plate 112 The amount of color can be regulated.

Within limits, which are explained in more detail below, if the surface speed the transfer roller 10 is increased at the ink transfer nip 106 offered color film is presented or offered with a faster or greater degree and it is accordingly, more ink is transferred to the lithographic printing plate 112 through the surface of the roller 90. The reverse takes place when the surface speed of the roller 10 is decreased.

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The ink film present between the adjacent surface sections of the roller 10 and 90 104 allows the rollers 10 and 90 with different surface speeds in one another Sliding engagement are rotated, since the color film 104 is also a lubrication, which a slip between Adjacent surfaces of the rollers 10 and 90 allowed without it to a frictional deterioration or negative influence comes. Due to the slip between the rollers 10 and 90, the ink film 104 calendered, smoothed, dosed and distributed by the color between the adjacent surface sections of the rollers 10 and the ink film 130 on the forming roller 90 is sheared off to thereby form the ink film 100 to create. The thickness of the ink film 100 is determined by the pressure between the metering roller 12 and the transfer roller 10 and the speed of the transfer roller 10 is determined or controlled.

The transfer roller 10 is preferably driven at a surface speed driven within a range of a few hundred feet per minute (feet per minute) is slower than the surface speed of the form roller 90. For example, if a printing machine has a If the paper has a line speed of 1,200 feet per minute, so have the surface portions of the printing plate 112 and the forming roll 90 normally have a surface speed from 1,200 feet per minute. The surface speed of the transfer roller 10 would then preferably between about 50 and 100 feet per minute.

The color films 104 and 130 become at the color transfer nip 106 combined or brought together and split in turn when the rollers 10 and 90 or their surface sections

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move away from the ink transfer gap 106 in turn. The fresh paint film adheres to the surface of the forming roller 90. That color that is rejected by the forming roller 90 or has not been accepted, forms an ink return film 116 which may be slightly uneven, adheres to the surface of the transfer roller 10 and which is fed back to the ink bead 102 which is adjacent the paint metering gap N that is to be metered. The dye return film 116 is therefore uneven, because those portions on the form roller 90 from which ink has been removed represent image portions on the plate 112 remove different amounts of ink from the ink film 104, to dispense the film 128 on the forming roller 90 again. As already mentioned, the color film 128 has sections 128 'with less color, of which color due to image sections 120 has been removed from the platen 112, resulting in an uneven film 128.

Since the ink film 100 on the surface of the forming roller 90 moves from the ink metering nip 106 into the vicinity of the transfer roller 10, the film 100 is essentially uniform, since the non-uniform film 130 combines with the uniform film 104 on the transfer roller 10. is brought together. The film 130 picks up paint from the film 104 in the "starved" portions 128 ¹ with less paint. The transfer roller 10 rotates at a speed which satisfies the ink requirement of the form roller 90 through the override clutch 66. The return film 116 is then returned to the excess ink on the ink bead 102 between the metering roller 12 and the transfer roller 10 in order to process the ink film 104 again.

It has already been explained that the color film 130 is smoothed, spread, measured and regulated at the color transfer gap 106 between the transfer

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"BOEHMERT & BOEHMERT * '

roller 10 and the forming roller 90. The conditioning roller 86 splits the film 110 by taking up the film 100, to form a matte finish on the paint film 100a. Any irregularities such as streaking in the film 100 are leveled and uniformed to make a film 100a of very uniform thickness form.

The interfacial tension between the outside of the less viscous wet liquid film 204 causes due to the molecular attraction between the surface of the more viscous Color film 100a that part 216 of the smoothed and evened film 204 of dampening liquid is the surface color film 100a is added, which in turn is attached to the plate at the point of contact between the pressure plate 112 and the forming roller 90 at the ink gap 120 is fed or transferred there.

The lithographic printing plate 112 has hydrophilic or water-friendly sections 121 without images or images, and oleophilic or ink-accepting image sections 122 on their Top. If the printing plate 112 is provided with raised image sections, the dampening unit 200 would not be required, to prevent transfer of color to the sections that do not have pictures or sections.

At the gap 120 between the application roller 90 and the printing plate 112, the paint film 100 is split open and then forms thin films 125 of paint and water over the oleophilic Surfaces or surface portions 122 of the printing plate. The dampening liquid layer 216 becomes when dampening liquid is supplied, carried on and in the paint film 100, and is also spread around a thin film 226 of dampening liquid over the hydrophilic portions 121 of the printing plate.

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^: -B'OEHMERT & B (OEHMERt

An insignificant amount of dampening fluid remains the surface of the forming roll 90 moving away from the nip. The amount of moist liquid remaining on it however, is transferred with the ink film 128 to the ink film 130a on the ink supply roll 94 where the dampening liquid is driven out and / or evaporated to such an extent that it has no effect on the inking system is.

The ink film 128 remaining on the forming roller 90 is combined or brought together with the film 130a on the ink supply roller 94 and split up and collected on the roller 94. Ink present on roller 94 is ^{fed to the portions 128 1} with little ink of film 128 and in this way reduces the known effect of "ghosting" in film 128 by forming a uniform film 130 before it again enters gap 106 entry.

The dampening liquid layer 216 is substantially increased applied the same way. An excess of dampening liquid 201 is fed to the bead 202 to form a dampening liquid film 204, which is then applied to the ink film 100a on the forming roller 90 in the gap 106a. The wet liquid film 217 then returns to the bead 202 back to be dosed again in the gap Na.

From the above it can be seen that the inking unit improved according to the invention for applying Color in printing systems offers or creates a control option in order to carry out a metering at the metering gap N. and to provide an ink film 104 of precisely controlled thickness by reducing the pressure between the transfer roller 10 and of the metering roller 12 and the surface speeds of the relatively interacting rollers are controlled will. The extent to which the dosed ink film 104 corresponds to the

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Ink film 130 is offered on the form roller 90 in the ink transfer nip N and also the hydraulic power to Obtaining the desired film splitting are controlled or controlled.

To avoid conditions that could cause paint to build up, which could make it impossible to To form a film 104 of precisely controlled thickness, the roller assembly provides for elimination of paint that is present in Form of an ink film 116 on the transfer roller 10 is returned and moves away from the ink transfer nip. Accordingly, the effect of the unused, exhausted ink film, which is not accepted by the form roller 90, from the inking system or inking unit eliminated by moving the film 116 to the "flooded" paint metering gap N is returned, and is not left behind, in order then to build up on the transfer roller 10 if necessary, as was the case with previous devices.

As an aside, it should be noted that the above-described and the embodiment shown in the drawing serves only to explain the present invention and can of course be designed differently without the To leave the scope of the invention.

It should also be noted that both the transfer roller 10 and the metering roller 12 with the printing machine drive via gears, gears or the like. could be connected or can be driven by an independent drive to the conditions described above with regard to to achieve a special speed ratio.

It should also be noted that the transfer roller be moved back and forth in the transverse direction or in the axial direction

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to smoothen the color films 130 and 100 further.

Fig. 4 shows a pair of inking units 1, as in the Standard version can be used when both sides of a web W are to be printed. A printing unit U has whole Generally speaking, a pair of printing stations (printing couples) C, each having an inking unit 1 and a dampening unit 200.

If necessary, two on one side of the web W To print colors, the printing station C shown on the right in the drawing must be reversed as shown in Fig. 5, so that the web W can be guided in its lines so that it can be printed on a single page Reversing the direction of the inking roller 90, the dampening liquid is applied over the thin "ghost film" of paint, which leaves the plate 112 behind the ink supply roll 94 ' and evens out the color film to a certain extent. A fresh supply of paint becomes the color liquid and paint fed on roller 90 as roller 90 moves through nip 106. Accordingly, the printing station C can be reversed by simply reversing the drive of the printing station and motors 69 and 269.

Since the friction is changed when reversing the inking unit 1, the disc brake 41 should be adjusted to to adjust or control the speed ratio between the mold roller 90 and the transfer roller 10.

It can be seen that the films of paint and wet liquid, as shown in Fig. 1, correspond to a standard printing station, which is in the normal or standard direction and that their films would locally change from those shown when the printing station reversed would be to first apply wet liquid and then paint on the wet liquid.

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File: p 1659

April 17th 1979

REFERENCE LIST
(LIST OF REFEEENGE NUMERALS)

1 Paint application device 1 ? Side frame (of 1) 2 - 4th Side frame (of 1) 4th 5 Stop Blocks (from 2.4) 5a - Adjustment Screws 5 6th Stop Blocks (from 2.4) 6a - Adjustment Screws 6th 7th - 7th 8th - 8th 9 - 9 10 Ink transfer roller 10 11 - 11 12th Ink metering roller 12c - elastic cover 12th 13th - 13th 14th Paint tray 14a - color 14th 15th - 15th 16 Shut-down connecting link 16a - groove (in 16) 16 17th - 17th 18th Shutdown connection 18th 19th - 19th 20th Stub shaft 20th 21st - 21st 22nd Mute1we11e 22nd 23 - 23 24 Parking cylinder 24 2.5 - 25th Descent cylinder 26th 27 - 27 28 Skew arm 28a - groove (in 28) 28 29 _ 29 30th Stub shaft 30th

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5Ί stub shaft (of 11) 31 32 stub shaft (of 11) 32 33 - 33 34 _ 34 35 blocks 35 36 blocks 36 37 sow pigeons 37 38 self-aligning bearings 38 39 camps 39 40 springs 40 41 - 41 42 Pressure Adjustment Screw 42 43 - 43 44 stub shaft 44 ^ 5 Laaer 4-5 46 stub shaft 46 47 - 47 48 - 48 49 - 49 50 adjusting screw 50 51 disc brake 51 52 - 52 53 friction pads 53 54 approach (of 28) 54 55 Support 55 56 Support (of 18) 56 57 - 57 58 wave 58 59 - 59 60 gear (on 31) 60 61 screw 61 62 gear 62 63 - ■ 63 64 gear 64 65 - 65

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66 clutch Ö1a- switch 82, 82 'ink supply rollers 66 67 - 83 - 67 68 - 84 resistance 68 69 gear motor ⁸ ^ ~ nr τ? η 69 70 gear 86 conditioning roller 86b- screw 70 71 gear 87 - 71 72 - 88 - 72 73 - 89 - 73 74 - 90 forming roller 74 75 - 91 core (out of 90) 75 76 - 92 bearings 76 77 - 93 '- 77 78 - 94.94. ' Ink supply roller 78 79 - 95 - 79 80 connecting cable 96 plating (of 90) 80 97 - 81 98 - 82 99 " 83 100 color film 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

100 'color film (on 8b)
100a color film

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101 layer of paint 101 102 color bead 102 103 paint smear layer 103 104, -104 'color film 104a - color film 104 105 color film 105 106 gap 106a - gap 106 107 107 108 outer outer surface (out of 104) 108 109 - 109 110 inner surface (out of 104) 110 111 - 111 112 pressure plate (on P) 112 113 - 113 114 - 114 115 - 115 116 return film 116 117 - 117 118 - 118 119 - 119 120 SoaIt 120 121 hydrophilic sections (out of 112) 121 122 image sections (on 112) 122 123 - 123 124 _ 124 125 (thin) films 125 126 - 126 127 - 127 _ΛΟΆ 128 '- Sections with little color 128 129 - 129 130 color film (on 90) 130a - color film 130 131 "outside (of 130) 131 132 - 132 133 - 133 134 - 134 135 - 135

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File: ·

REFERENCE CHARACTERISTICS LIST OF RSjTERENCE NUMERALS

200 dampening system
20-1 wet liquid 1 202 bead ? _ 2O3 - 204 · Moist liquid layer 4 · ? .n5 * 5 2O ₆ - 6th 207 ~ 7th 208 - 8th 209 - 9 210 hydrophilic transfer roller (from 200) 210a - wave 10 211 - 11 2 ^ 2 metering roller (of 200) 212a - shaft 12th 213 - 13th 214 tub 214ä - wet liquid 14- 215 - 15th 216 partial film (of. 204) 16 217 Wet liquid film 17th 218 - 18th 219 " 19th 2 20 20th 221 21st 222 22nd 223 23 2 24- " .24 2 25 ~ 25th 2 pfi film 26th ² 27 27 ² 28 - 28 2 29 ~ 29 23O - 30th

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266 - 66 267 - 67 268 - 68 269 engine 69 270 70 271 71 272 72 273 73 274 74 275 75 276 76 277 77 278 78 279 79 280 80 281 81 282 82 283 83 284 Resistance 84- 285 85 286 86 287 87 288 88 289 89 290 90 291 91 292 92 293 93 294 94- 295 95 296 96 ² 97 97 ² 98 98 ² 99 99 300 100

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P - pressure plate N - ink metering gap Na - wet liquid metering gap W - track

U - printing unit C - printing station

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Claims (14)

BOERMERT & -BOEHMERT D 1659 April 17th. 1,979 291Ö048 claims 1. Printing machine in which ink is applied to a printing plate which forms an image on a liquid-receptive Material transfers characterized by a single forming roller (90) having an ink receiving surface (of 96); Means (92) which press-engages the forming roll (90) support rotatably with the pressure plate (P; 112); positive Drive means connected to the forming roll (90); an ink transfer roller (10) with an oleophilic, ink-absorbing surface; Means (39) holding the ink transfer roller 10 under pressure engagement with the forming roll (90) rotatably supported; Means (12, 14; 82, 82 ') for forming an ink film (104) on the transfer roller (10); reversible drive means (60-69) drivingly connected to the ink transfer roller (10); a pair of ink supply rollers (94, 94 '); and means for rotatably supporting the ^{ink supply rollers (94, 94 1} ) / so that the surface of the form roller (90) moving out of press engagement (at 120) with the printing plate (P; 112) is in the vicinity of an ink - Supply roller (94) moves before it is in pressure engagement with the ink transfer roller (10) arrives. 909844/0873 BOEHMERT & -BOEHMERT -S- 2316048 2. Printing machine according to claim 1, characterized by a rotatably supported, under pressure with the form roller (90) cooperating fountain liquid transfer roller (210); Means (212, 214) with which a wet liquid film (217) to be formed on the fountain liquid transfer roller (210); a (second) reversible drive means, which is drivingly connected to the dampening liquid transfer roller (210); wherein the support means for the ink supply rollers (94, 94 ') support the latter so that the surface of the forming roller (90) resulting from the pressure engagement with the pressure plate (P; 112) moved out, moves into the vicinity of one of the ink supply rollers (94, 94 ') before it in pressure engagement with the ink transfer roller (10) or the dampening liquid transfer roller (210) arrives. 3. Printing machine in which color is applied to a printing plate which transfers an image onto a web, marked by a paint metering means (12); an ink transfer roller (10) with an oleophilic ink-receiving one Surface; a forming roller (90) which is in rotatable contact with the printing plate (P) and has an ink-receiving Surface which is in pressure engagement with the ink transfer roller (10) to form an ink transfer nip (106) is to be brought; Support means for supporting the paint dosing means (12) and the ink transfer roller (10) in mutual pressure engagement to form an ink metering gap (N) between adjacent surfaces of the ink metering means (12) and the ink transfer roller (10); Means for supplying paint (14a) to the paint metering gap (N) to form a smooth, even and continuous Ink film (104) on the surface of the ink transfer roller (10); a reversible drive for Setting or controlling the direction of rotation of the color over ~ support roller (10) relative to the forming roller (90); a dampening liquid transfer roller (210), by means of which 909844/0873 BOEHMERT & -BÖEHMERT - ' 16048 Dampening liquid is to be applied to the surface of the ink film (100a) on the surface of the form roller (90); Support means for rotatably supporting the dampening liquid transfer roller (210) in pressure engagement with the forming roller (90) to form a dampening liquid transfer gap (106a); a wet liquid metering means (212); Means for supplying dampening liquid to the dampening liquid transfer roller (210) so that the dampening liquid dosing means (212) has a smooth, even forming a continuous film of dampening liquid (217) on the surface of the dampening liquid transfer roller (210); and a reversible drive for the dampening liquid transfer roller (210). 4. Inking unit for the optional and uniform application of a liquid newspaper printing ink or the like. existing color film on a printing plate of a printing machine, in particular for a printing machine according to one or more of the preceding Claims, characterized by a color metering means (12); an ink transfer roller (10) with an oleophilic, ink-absorbing one Surface; a form roller (90) having an ink receiving surface which is in pressure engagement with the ink transfer roller (10) is brought to form a color transfer nip (106); Support means for supporting the ink metering means (12) and the ink transfer roller (10) in mutual pressure engagement to form an ink metering gap (N) between adjacent surfaces of the ink metering means (12) and the ink transfer roller (10); a control means (51) for controlling the surface speed of the ink transfer roller (10) relative to the Surface speed of the forming roll (90); Means to Feeding of paint (14a) to the paint metering gap (N) for the purpose of Formation of a smooth, uniform, continuous film of ink (104) on the surface of the ink transfer roller (10); and means for adding color to the surface 90 984 4 / OMB 73 BOEHMERT & -ΒΟΕΉΜΕ & Τ of the ink transfer roller (10) extending from the ink transfer gap (106) moved to the paint metering gap (N). 5. Inking unit according to claim 4, characterized in that the speed control means comprises a disc (51) associated with the ink transfer roller (10) in order to the peripheral speed of the ink transfer roller (10) to be able to keep less than the peripheral speed of the forming roller (90). 6. Inking unit according to claim 4 or 5, characterized in that the forming roller (90) with an elastic, non-absorbent Surface (96) is provided. 7. Inking unit according to claim 4 or 5, characterized in that the forming roller (90) has an elastic, absorbent surface (96). 8. Inking unit according to one or more of claims 4 to 7, characterized by at least one ink supply roller (82, 82 ') with an oleophilic surface; and support means for supporting the ink supply rollers (82, 82 ') in pressure engagement with the ink transfer roller (10), the ink supply roller (82, 82 ') being able to remove excess ink and to fill or supplement the excess paint on the surface of the paint transfer roller (10), before the ink film (104) moves to the forming roller (90). 9. Inking unit according to one or more of claims 4 to 8, characterized by a conditioning roller (86) which is in rotatable contact with the newly dispensed ink film on the surface of the forming roller (90), and for a matt Finish of the color film ensures. 10. Inking unit according to one or more of claims 4 to 9, 909844/0873 BOEHMERT & -BTOEHMERT 2816048 characterized by an ink supply roller (94) which is in rotatable contact with the surface of the ink film (128 ¹ , 128 ") which is being advanced from the printing plate (P; 112), the ink supply roller (94) being the Surface of the uneven color film (128 ', 128 ") leveled. 11. Inking unit according to one or more of claims 4 to 10, characterized in that the ink metering means is an ink metering roller (12) has an oleophilic surface; and the means are present by which the oleophilic ink metering roller (12) in pressure engagement with the ink transfer roller (10) too bring is. 12. Inking unit according to one or more of claims 4 to 11, characterized by a hydrophilic roller (210) by means of which creates an even film of moist liquid on the The surface of the newly dispensed ink film is to be brought onto the surface of the forming roller (90); Support means for the rotatable Supporting the hydrophilic roller (210) in mutual pressure engagement with the forming roller (90); a fountain solution dosing agent (212); and means for supplying fountain solution to the hydrophilic roller (210) so that the fountain solution metering means (212) a smooth, uniform, continuous film of dampening liquid on the surface of the hydrophilic roller (210) generated. 13. Inking unit according to claim 12, characterized in that the moisture metering means comprises a metering roller (212) which by suitable means is in relative pressure engagement is to be brought with the hydrophilic roller (210). 14. Inking unit according to one or more of claims 4 to 13, characterized in that the speed control means has a variable speed drive which is functional with the ink transfer roller 909844/0873
COPY I BOEhMERT SrBOEtIMEiIT - G- (10) Connected to the Parb Transfer Roller (10) to be driven at a slower speed than the forming roll (90). 09844/0873 Copy