DD154530A5 - METHOD AND DEVICE FOR DOSING PRINTING COLOR - Google Patents

Abstract

According to the invention, racemic alpha-isoprophyl-4-di- or -trifluoromethoxyphenylacetic acid is known per se

Description

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Method and device for dosing printing ink Field of application of the invention:

The invention relates to a method of dosing paint applied to a printing plate by means of a roller assembly, the roller assembly being rotated so that the surface speed is substantially equal to the peripheral speed of the printing plate, especially for rotary printing presses.

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Characteristic of the known technical solutions;

Newspaper printing machines are generally constructed so that either two or four spaced-apart printing plates are arranged across the length of the plate cylinder so that each plate on the plate cylinder simultaneously contacts a paper web. Each of the printing plates on the plate cylinder usually prints with the same color. However, it is sometimes desirable or necessary to apply printing ink of various colors to a printing plate, or to not apply paint to a portion of a web.

There are already implementable or movable ink reservoirs have been created to apply color stains on a printing plate of a plurality of printing plates on a printing cylinder

Object of the invention:

In particular, the present invention discloses improvements in the field of implementable. Paint reservoirs which are particularly suitable for use in combination with an inking unit of the type disclosed in U.S. Patent Application Serial No. S.N. 797 262 of April 18, 1978 is shown and described by the same Applicant.

Explanation of the essence of the invention:

The inventively improved, convertible ink reservoir has a pickup roll and an applicator roll, one of which has a hard surface and the other has an elastically compliant surface which is in press-fit engagement with each other under pressure. The take-up roll can meter or meter an excess of color at a dosing gap, flooded with ink, between the take-up roll and the applicator roll so that a controlled ink thickness is metered onto the surface of the applicator roll. The color film on the applicator roll

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is transferred at a supply gap between the applicator roll and a metering roll. The difference in speed between the metering roll and a transfer roll permits slippage to form a thin, smooth ink layer on the transfer roll as the ink is divided and metered. The transfer roller then applies the paint to a forming roller.

The transfer roller and the forming roller are driven at approximately the speed of the printing plate which is engaged with the forming roller.

When the printing plate is made hard-faced, the molding roll should have an elastically yielding surface. In order to reduce the required drive in terms of roller slip at the transfer nip between the metering roll and the transfer roll, the transfer roll is provided with a hard surface and driven at a greater surface peripheral speed than a metered roll provided with an elastic jacket against which it slides. as shown and described in a patent application of the same applicant entitled "inker for newspaper press" (international application number PCT / US 79/00948 of 5 November 1979).

In a preferred embodiment of the present invention, the convertible ink reservoir on a paint tray with a certain amount of ink. An applicator roll is rotatably connected to the ink tray to provide controlled amount of color output. A take-up roll is provided in the inkwell to deliver ink to the applicator roll. A facility

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rotatably binds the take-up roll to the ink tray to adjustably position the take-up roll relative to the applicator roll so as to obtain the desired controlled color output.

Embodiments of the present invention are described in the subclaims.

As already apparent from the above references, and will be apparent from the following parts of the description, the object underlying the present invention is in particular to provide a convertible, movable ink reservoir, which is arranged adjustable relative to a pressure cylinder Apply color to a selected printing plate on the cylinder, and to optionally refrain ink supply to sections of the cylinder. It should be possible to adjust the color output from the convertible ink reservoir by controlling the pressure between the pickup roller and a supported by the ink pan of the ink fountain applicator roll, and it should continue to be possible to remotely control the color output from a point remote to the paint reservoir. Furthermore, the convertible ink reservoir according to the invention should be removable from the printing machine for cleaning, without it being necessary to readjust the applicator roll afterwards relative to the metering roller of the inking unit for the printing press. Furthermore, the ink reservoir according to the invention should open up the possibility to use relatively small diameter rollers to create a considerable indentation and thus a corresponding pressure at the transfer gap, the strip width at the contact point while the shearing section between a metering and a

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transfer roller to be minimized.

Other parts of the task will become apparent from the following description

Ausführunpsbeispiele;

The invention and preferred embodiments of the invention are explained below with reference to a drawing. It shows:

Fig. 1 is a schematic representation of the color system for a lithographic printing machine, wherein in particular the various color and Feuchtflüssigkeitsfilme (exaggerated) are shown;

Fig. 2 is a front view showing the metering roller, the transfer roller and the applicator roller and the support structure;

Fig. 3 is a section through the illustration according to

Fig. 2 in the direction of the section line 3-3. seen in Figure 2;

Fig. 4 is a schematic representation of a standard printing station;

Fig. 5 is a schematic representation of a reversed printing station;

Fig. 6 is a schematic representation of

electric circuit of the motors for the dampening unit and the inking unit;

Fig. 7 is a sectional view seen in the direction of the section line 7-7 in Figure 2, in an enlarged view.

Fig. 8 is a plan view of the illustration of Fig. 7, i. that is to say, an implementable ink reservoir according to the invention, wherein some parts have been removed for the sake of clarity;

Fig. 9 is a sectional view seen in the direction of the section line 9-9 in Fig. 8;

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Fig. 10 is a schematic illustration of the color system for a lithographic printing machine showing the application and positioning of individual single-page convertible ink reservoirs; - - and

Fig. 11 is a view similar to FIG. 10 with convertible ink reservoirs for individual pages and double pages.

In the drawings, the same or equivalent parts are denoted by the same reference numerals.

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In Fig. 1 of the drawings, reference numeral 1 generally designates an inking device, hereinafter also referred to as an inking unit, for applying ink and fountain solution to a lithographic printing plate of a printing machine. In the following also briefly referred to as dampening unit 200 water applicator is a dampening unit of the type as shown and described in US-PS 39 37 141, so that the disclosure of this document hereby for simplicity's sake insofar to the subject of the present patent application is done.

As best seen in Figure 2, the inking unit 1 has spaced apart side frames 2 and 4 which are interconnected by unillustrated link supports and a strong, solid construction for supporting a forming roll 90, a ink transfer roll 10 Farbdosierwalze 12, an inking roller 312 and a paint receiving roller 310 form. The side frames 2 and 4 may be the side frames of a printing press, or side frames of an inking unit that are connected to the side frames of a printing press.

On the side frames 2 and 4 are tilting levers 16 and articulated by means of stub shafts 20 and 22 respectively. Between the side frames 2 and 4 and the rocker arms 16 and 18 tilting cylinders 24 and 26 are hinged, by means of which the rocker arms 16, 18 are to be pivoted about the burrs 20, 22 to the dyeing

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Dosierwalze 12 in position, as will be explained in more detail below, and to transfer color via the ink transfer roller 10 to the forming roller 90 of a lithographic printing machine.

A skew arm 28 may be provided to pivot the one end of the ink metering roller 12 about the axis of the ink transfer roller 10. As schematically illustrated in FIG. 2, the tilt arm 28 is rotatably mounted to a stub shaft 30 which extends adjacent to an end of the ink transfer roller between the rocker arm 18 and the tilt arm 28.

The skew arm 28 and the rocker arm 16 each have grooves 28a and 16a, respectively, formed in the inboard sides in which blocks 36 are slidably mounted carrying self-aligning bearings. In the upper portion of the grooves 28a and 16a, blocks 35 are fixedly mounted with screws 37 to provide suitable support for the shaft portions 31 and 32 of the ink transfer roller 10. Suitable means such as elastic springs 40 between the blocks 35 and 36 push the blocks 36 away from the longitudinal axis of the ink transfer roller 10 in the longitudinal direction of the tilting arm 28 and the rocker arm 16. A pressure adjusting screw 42 pushes the block 36 in the longitudinal direction of the tilting arm 28 and the rocker arm 16 against the restoring force of the springs 40. stub shafts 44 and 46 extending from the opposite ends of the ink metering roller

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12 extend outwardly are stored in the self-aligning bearings 38, so that it is ensured that the ink transfer roller 10 with the Farbdosierwalze 12 is in mutual rotating J pressure engagement. The shaft portions 31 and 32 to be referred to as stub shafts also extend outwardly from the opposite ends of the ink transfer roller 10 and are supported in bearings 39 which are disposed in the blocks 35, respectively.

It can be seen that rotation of the pressure adjusting screws 42 moves the opposite ends of the ink metering roller 12 relative to the axis of the ink transfer roller 10, so that in this way the pressure between the ink transfer roller 10 and the ink metering roller 12 is to be controlled.

As can be seen from Fig. 3, a suitable means is provided with which to set and maintain a desired angular relative position between the rocker arm 18 and the skew arm 28. In the embodiment shown in Fig. 3, an adjustment screw 50 is rotated in the skew setting 28 and extends through threaded holes, which are provided in pivot blocks 52a and 52b. The blocks 52a and 52b are hinged to a projection 54 on the tilt arm 28 and a projection 56 on the rocker arm 18, respectively. By the adjusting screw 50, the gap between the projections 54 and 55 can be adjusted to in this way the skew arm 28 relative to the

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Rocker arm 18 to move around the shaft 30 can.

The side frames 2 and 4 have suitable adjustable stops 5 with adjusting screws 5a extending therethrough to engage the rocker arms 16 and 18 when the piston rods of the tilting cylinders 24 and 26 are extended to provide a desired relative pressure between them Farbdosierwalze 12 and the color-coated transfer roller 10, the latter being provided to transfer color via a forming roller 90 on a lithographic printing plate 112 on a plate cylinder P, as will be explained in more detail below. Block-like stops 6 with set screws 6a provide an "off-press" limit when the piston rods of the tilt cylinders 24 and 26 are retracted to move the ink metering roller 12 away from the surface of the ink transfer roller 10.

The stub shaft 44 extending outwardly from the one end of the ink metering roller 12 has a gear 60 fixedly keyed thereto and which meshes with a gear 71 which is seated on a shaft 58 rotatable through an opening of the side frame 2 extends. The shaft 58 is connected to the shaft of a reversible variable speed drive 69, such as an electric geared motor. This could be seen by another drive, such as a drive with a gear, sprockets, belts or the like. replaced and driven by the printing press drive

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be, and then preferably with a speed-variable transmission or the like.

The line 80, by means of which the drive 69 is energized, is connected via a variable resistor 84 to the terminals of the drive motor 69, so that the motor can run at different speeds and control the rotational speed, and thus the peripheral speed of the ink metering roller 12 is independent of the printing machine drive which controls the speed of those rollers or other means by which ink is applied to the plate cylinder, in the present case rollers 10 and 90. If appropriate, the motor 69 can be replaced by a variable speed clutch, which connects the shaft 58 with the printing machine drive, as described above.

A suitable means is provided in order to be able to supply the paint metering nip N between the adjacent surfaces of the inking roller 312 and the ink receiving roller 310, an excess color supply. In the embodiment according to the invention shown in FIG. 1, a part or section of the ink pickup roller 310 is immersed in color 14 a, which is located in a paint tray 320.

The color 14a is preferably of the type used for coloring raised image portions in the case of letter printing or of the type used in direct or lithographic offset printing or newspaper printing.

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or she is of similar nature.

The ink receiving roller 310 and the ink metering roller 12 preferably have a hollow, tubular bushing (aka core) with a resilient coating 12c attached to the outside of the bushing. The material is oleophilic; the surface can be smooth or textured. The inking roller 312 is preferably hard and has an outer surface that is textured as well as ink receptive and oleophilic, respectively. The outer surface of the inking roller 312 may accordingly consist of copper, steel or plastic, for example. The surface of the inking roller 312 may be either hard or elastically compliant.

The forming roll 90 is preferably cut to the same length as the printing plate to prevent any accumulation of excess ink which might build up on the forming roll if it is longer than the printing plate. The ink transfer roller 10 has a hard, smooth surface similar to that on the inking roller 312.

As can be seen from Fig. 1 of the drawing, the ink metering roller 12 is preferably in a depressed by pressure engagement with the ink transfer roller 10 state. The ink transfer roller 10 preferably has a tubular metal core, at the ends of which stub rolls are arranged which extend outwardly and are supported in the bearings 39 supported by the side frames 2 and 4 and having means for transferring the ink transfer roller 10 into

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bring impressive pressure engagement with the forming roll 90.

The forming roll 90 is preferably driven by a gear 90a, which meshes with a gear 90b / which is driven by the plate cylinder P of the printing press, and has a smooth, resilient outer cover.

An ink supply roll 94a, which is preferably designed as a vibrating roller, removes ink from sections 128 ¹¹ a color film 128 on the surface of the mold roller 90 and adds the color of the color overly exploited sections 128 'to, being in this manner a more uniform ink film on the surface of the Forming roller 90 forms, which moves from the gap 120 between the forming roller 90 and plate cylinder P to the gap A between ink transfer roller 10 and forming roller 90.

A second ink supply roller 94b, which is formed similarly to the ink supply roller 94a, is disposed between the plate cylinder P and the dampening unit 200 to smooth the ink film in the return from the forming roller 90, as explained in detail below.

A conditioning roll 86, preferably formed as a swing roll, is rotatably supported and conditioned on a shaft 86a in blocks 86d, and smoothes the surface of the paint film 100 to make the film more receptive to the acceptance of wet liquid. Screws 86b and 86c urge the blocks 86d and thus the conditioning roller 86 into compressive pressure engagement

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The surface of the conditioning roller 86 is preferably made of a material similar to that of the forming roll 90, so that the surface has the same affinity for color as the surface of the forming roll 90.

When the ink film 100 comes out of the nip A between the forming roll 90 and the ink transfer roll 10, it is sizing and calendering. A sized color film is not particularly receptive to wet liquid, so that the surface tension of the color molecules can reject the thin dampening liquid layer applied by the dampening unit 200. The conditioning roller 86 picks up a portion of the ink film 100 and thus divides it into a film 100 'on the conditioning roller and a remaining ink film 100a on the forming roller having a matte finish with microscopic depressions. The matte finish on the film 100a more readily accepts the thin layer of wet liquid due to the molecular attraction, which is now greater than the surface tension of the wet film forming a film 216.

The conditioning roller 86 and the ink supply rollers 9 4a and 94b preferably have such diameters that upon rotation, the ink is properly applied to the forming roller 90 and removed or redistributed therefrom.

The rollers 86, 94a and 94b designed as vibratory rollers are preferably with drives, not shown

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provided by means of which the rollers are reciprocating in the longitudinal direction and forth. Suitable vibratory drives of this type are well known in printing technology, so that a detailed description does not appear necessary. Rotation is generated by frictional contact with adjacent surfaces.

The dampening unit 200 is shown schematically in FIG. It has a hydrophilic transfer roller 210 on a shaft 210a and an elastic metering roller on a shaft 212a, which are mounted on the inking unit 1 in a manner similar to that described in US-PS 39 37 141. The metering roller 212 meters fountain solution 214a from a trough 214 onto the transfer roller 210 through a gap Na. The water film set by the pressure between the rollers 210 and 212 forms a thin wet liquid layer 204 which is metered by the wet liquid transfer nip 106a onto the matte finish of the ink film 100a on the surface of the forming roller 9O.

The metering roller 212 of the dampening unit is driven by a variable-speed, reversible motor 269. As shown in FIG. 6, the resistor 84 and a resistor 284 associated with the motor 269 are connected to an electrical power source and a pair of coupled bipolar switches 81a and 81b are controlled about the direction of rotation of the motors 69 and 269.

The operation and operation of the device described above is as follows:

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The pressure between the ends of the ink transfer roller 10 and the ink metering roller 12 is adjusted by rotating the pressure adjustment screws 42.

Since long rolls which are compressed under pressure tend to bow, the pressure adjacent to the centers of the rolls is less than the pressure at their end portions. The pressure in the longitudinal direction of the rollers 10 and 12 is by rotation of the adjusting screw 50 and rotation of the Schrägstellungsarms 28 about the axis of. Ink transfer roller 10 is set in a position in which a desired pressure distribution over the length of the rollers 10 and 12 is present.

The adjusting screw 5a is set to engage with the rocker arms 16 and 18 and to set a desired pressure between the ink transfer roller 10 and the ink metering roller 12.

For the purpose of a graphical representation of the novel function and procedure of the apparatus shown and described above, in Fig. 1 is a schematic representation of the ink receiving roller 310, the inking roller 312, the Farbdosierwalze 12, the ink transfer roller TO and the forming roller. The color and water films are exaggerated for clarity.

As shown in FIG. 1, the inking roller 312 associated with the ink fountain 320, when provided for transferring ink to a printing plate 112, is preferably a hard surface roller, which is the color of the ink fountain roller

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Received color pickup roller 310, which is immersed in color 14 a, which is located in the color trough 320. The inking roller 312 is rotatably supported in mutual pressing engagement with the ink metering roller 12, as will be explained below.

As the surface of the roller 310 moves toward the ink metering nip N between the rollers 310 and 312, a relatively thick ink layer 101 is picked up and brought to the surface of the ink receiving roller 310. At the tangent point of the ink metering nip N a color bead builds up, which forms a color excess. The size of the Farbwulst forming excess amount of ink is regulated by the fact that excess ink flows back into the ink fountain 3 20. The color bead forms a color reservoir from which ink is withdrawn by the inking roller 312. As the rollers 310 and 312 rotate in mutual pressure engagement, a color layer is added between the adjacent surfaces of these two rollers, which are separated by a thin lubricating paint layer. Since the inking roller 312 has an oleophilic surface, a part of the ink film adheres to the surface of the surface of the roller 310 and forms a film having the color remaining on the surface of the roller 310, which flows back into the ink fountain 320. The ink film 101 is then distributed on the surface of the roller 12 by the rotational squeezing action between the rollers 12 and 312 at its tangential line. Rollers then carry the ink film from the platen 12 to the plate cylinder P.

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At the gap T between the rollers 10 and 12, it can be seen that the ink transfer roller 10 is pressed into the elastically yielding surface of the ink metering roller 12, and that the ink film 104 on the ink transfer roller 12 comes into contact with the ink film 107 on the ink transfer roller 10. The outside of the ink film 104 and the outside of the ink film 107 on the ink transfer roller 10 are compressed and cause a hydraulic connection between the rollers 10 and 12 when they rotate closely adjacent to each other, however, without physical contact between the roller surfaces.

It is important to note that the relatively thick ink film 104 allows the rollers 10 and 12 to rotate at different speeds, as discussed below.

Preferably, the ink transfer roller 10 is driven by the forming roller 90, which is rotated by the gear 90a at the same peripheral speed as the printing plate 112, and moves at a greater peripheral speed than the ink metering roller 12. By regulating the peripheral speed difference of the ink metering roller 12 and the ink transfer roller 10 For example, the amount of ink transferred to the ink transfer roller 10 and applied to the mold roller 90 can be regulated.

Within certain limits applies, as will be explained in more detail below, that when increasing the peripheral speed of the ink metering roller 12 of the Farbübertragungsspalt T presented color film

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104 increases faster, so that more ink is transferred to the surface of the ink transfer roller 10, the forming roller 90 and the lithographic printing plate 112, and that the reverse is the case when the peripheral speed of the ink transfer roller 10 is lowered.

The ink film between adjacent surface portions of the rollers 10 and 12 allows the rollers 10 and 12 to be slidably rotated at different peripheral speeds relative to each other, since the ink film 104 provides lubrication which prevents slippage between the adjacent surface portions of the rollers 10 and 10, respectively without causing damage caused by friction or even destruction. Due to the slippage between the rollers 10 and 12, the paint film is metered, i. is metered and distributed by dividing the color between the adjacent surface portions of the rollers 10 and 12 so as to form the ink film 106a. The thickness of the ink film 106a is controlled by the pressure between the ink metering roller 12 and the ink transfer roller 10 and the speed of the ink transfer roller.

Assuming that a one-unit thick ink film is applied to the image sections of the printing plate, the ink film 216 on the form roller 90 is probably about two units thick, with half transferred to the printing plate 112 and the other half as a film 128 '. remains on the forming roll 90 · remains. If the film 100 is equal to the film 216, the film 106a would be three units thick

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the film 100 and the film 107 have approximately the same thickness because the film 128 'is combined with the film 106a at the gap A. Assuming no slippage, the film 104 would be four units thick and the film 106b would be three units thick. It can be seen that 3 3% of the color is removed from the transfer roller 10 at the gap A, while only 25% of the metering roller 12 is removed at the gap T, and that more color for the lubrication is present at the gap T than at the gap A. Slippage between the roll surfaces at the gap T requires less power than at the gap A.

The metering roller 12 is preferably driven at a peripheral speed that is, for example, several hundred feet / minute slower than the peripheral speed of the transfer roller 10 and the forming roller 90. For example, when a printing machine moves through paper at a speed of 1200 feet / minute, it will normally have the printing plate 112, the forming roll 90, and the transfer roll 10 have circumferential speeds of 1200 feet / minute. The transfer roller 10 would preferably rotate at a peripheral speed that is less than 2 40 feet / minute.

The ink films 106a and 130 are combined in the inking nip A and also cleaved when the rollers 10 and 90 are rotated away from the inking gap A. The fresh ink film 100 adheres to the surface of the mold roll 90. Paint rejected by the mold roll 90 forms a recirculated ink film 10, which is slightly uneven.

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may be moderate, and which adheres to the surface of the applicator roll 10 and is reclaimed to the gap T to be metered again.

The conditioning roller 86 breaks up the film 100 by receiving a film 100 'and forming a matte finish on the ink film 100a. Any unevenness of the film 100 is compensated so that a film 100a of a very uniform thickness is formed.

The boundary stress between the outside of the less viscous wet film 204, due to molecular attraction between the surface of the viscous paint film 100a, causes a portion 216 of the smooth and regular wet film 204 to be added to the surface of the paint film 100a, which in turn is transferred to the board at the point of contact between the plate .112 and the forming roller 90 at the ink gap 120.

The lithographic printing plate 112 has hydrophilic and non-water-friendly non-image portions 121 and oleophilic or color-receptive image portions 122 formed on the surface. If the printing plate 112 is provided with raised image areas, the dampening unit 200 would not be needed to prevent transfer of color to non-image portions.

At the gap 120 between the forming roll 90 and the pressure. plate 112, the color film 100 or 216 is split and forms thin films 125 of color and water

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oleophilic sections 122 on the printing plate. When fountain solution is applied, the fountain solution layer 216 is supported on and in the ink film 100 and also dispersed to form a thin film 216 of fountain solution over the hydrophilic portions 121 of the printing plate.

An insignificant amount of dampening liquid remains on the surface of the forming roll 90, which moves away from the nip 120. However, this remaining wet liquid is transferred with the ink film 128 on the ink film 130a on the ink supply roller 94a where the fountain liquid can be precipitated and / or evaporated to such an extent that it has no influence on the ink system.

The color of the film 128 remaining on the forming roller 90 is combined with the ink film 130a on the ink supply roller 94a, and divided and collected on the roller 94a. Paint on roller 94a is fed to sections 128 ¹ of film 128 which have been ink stripped so as to reduce the known effect of so-called ghosting of film 128 by forming a more uniform film 130 before film 128 Re-entry into the gap A takes place.

The fountain solution layer 216 is applied in substantially the same manner. A wet liquid excess 201 is supplied to a wet liquid bead 202 to form a wet liquid film 204, which is applied to the paint film 100a on the forming roll 90 in the gap 106a. A wet liquid

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Film 217 is returned to the dampening liquid bead 202 in order to be metered or metered again at the gap Na.

From the foregoing, it will be appreciated that the paint dispensing apparatus of the present invention provides the ability to control the metering at the ink metering nip N to provide a color film of precisely controlled thickness, internally, the pressure between the ink pickup roller and the inking roller 312 is set, and internally further, the peripheral speeds of the rollers 10 and 12 are controlled relative to each other. The extent to which the metered ink film 104 is presented to the ink film 107 on the transfer roller 10 at the ink transfer nip T and also the hydraulic force to obtain the desired film thickness is controlled.

Fig. 4 shows a pair of inking units 1 in a standard arrangement for printing on both sides of a web W. A printing station U normally has a pair of printing units C, each having an inking unit 1 and a dampening unit 200. When it is necessary to print two colors on one side of the web W, the right printing unit C must be reversed as shown in Fig. 5 so that the web W can be fed to the printer on a single page through the printing station. Upon reversal of the direction of rotation of the mold roll, wet liquid is applied to the thin "ghost" color film leaving the printing plate 112 after the ink fountain roller 94b smooths the ink film to some extent. A fresh supply of color becomes the dampening liquid and paint on the molding roll

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supplied when the forming roller 90 moves through the gap A. The unit C can accordingly be easily reversed by reversing the drive of the unit and the motors 69 and 269.

It can be seen that the dye and wet film shown in Fig. 1 represent a standard printing unit moving in the normal standard direction, and that the films would locally change from those shown if the printing unit were reversed to first damp and then apply paint to the dampening solution.

7 shows a replaceable ink reservoir, generally designated 300, with spaced support plates 302 and 304 for rotatably supporting a paint pickup roller 310 and an inking roller 312. The backing plates 302 and 304 are provided with screws 314 on the end walls 316 and 318 of the inkwell 3 20 attached.

The bottom 322 of the ink tray 320 is welded to spaced apart support beams 324 and 326. Latch supports 328 and 330 are secured by screws 329 and support the support beams 324 and 326.

As will be explained in greater detail below, the latch supports 328, 330 are removably attached to the printing press by suitable support means.

When the plate cylinder of the printing machine has four printing plates arranged along its length, four transportable ink reservoirs 300 are side by side

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attached or provided to bring color to the dyeing "meterierwalze 12.

With reference to Figures 7 and 8 of the drawing, it should be noted that the ink receiving roller 310 preferably has a smooth, resilient surface that is in pressure engagement with the surface of the applicator roll 312, which has a hard textured surface. In the illustrated embodiment, the applicator roll has a knurled or similarly configured surface so that it is correspondingly roughened to provide a frictional driving force for rotating the applicator roll 312 and the take-up roll 310 when the applicator roll 312 is in pressure engagement with the metering roll 12 of the paint system is.

The support plates 302 and 304 have slots 332 in which bearing blocks 33 4 are mounted. Each bearing block carries a bearing 335, which in turn carries an axis which extends from the opposite ends of the applicator roll 312 to the outside. The bearing block 334 is held in position by a locking screw 336 which extends through a threaded bore 337 in the support plates 302 and 304.

Axes 310a and 310b extend outwardly from the opposite ends of the pickup roll 310 into bearings 345 supported by bearing blocks 344 slidably disposed in slots 342 formed in the backing plates 302 and 304. Springs 346 engage the bottom of the slot 342 and urge the bearing blocks 344 to a position that defines the surfaces of the rollers 310 and 312

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would separate.

Hangers 350 and 352 are attached to the bearing blocks 344 and slidably attached to the side plates 302 and 304. Each hanger 350 and 352 is provided to adjust the position of the bearing block 344 relative to the support plates 302 and 304 to adjust the pressure of adjacent surface portions of the rollers 310 and 312.

An adjusting means 355 comprises an electric motor 356 for the purpose of driving a reduction gear 3 58, which has an output shaft 360. A drive adapter 362 and a gear 364 are secured by a pin 365 on the output shaft 3 60. The lower end of the adapter 362 extends through a central opening in the gear 64 so that the adapter 362 and the gear 364 rotate with the shaft 3 60.

The upper end of the adapter 362 is fixed to a shaft of a position potentiometer 368 having output leads 369, 370 and 371 electrically connected to a readout means 3 72 by means of which the relative pressure or strip thickness at the gap 3 75 between the two Pickup roller 310 and the applicator roller 312 is read, as explained below in more detail.

The gear 3 64 meshes with a gear 380 which is mounted on a shaft 382 which is mounted in bearings 384 which are mounted in an opening in the housing 385.

A control disk 386 is located at the end of the shaft 382.

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 4

fastened and engaged with a follower member 388 which sits on a rotatably mounted bolt. An adjustment screw 392 is seated on the shaft 382 for adjusting the distance between the end of the follower link 3 88 and the end of the head 395 of the adjustment screw 392. A lock nut 394 is located on the shaft 382 to prevent inadvertent rotation. The head 395 of the adjusting screws 392 is engaged with a lug 354 of the hanger 350.

When the motor 356 is energized, the output shaft 3 60 rotates, imparting motion through the gears 364 and 380 of the shaft 382. When the shaft 382 rotates, the control disk 3 86 also rotates, thereby moving the follower 388 and the head 395 of the adjusting screw 392, and gives the hanger 350 a longitudinal movement. Movement of the hanger 350 results in the bearing block 344 and take-up roll 310 being moved relative to the applicator roll 312 to adjust the width of the strip at the nip 375. The position indicator readout means 372 is calibrated with the adjusting screw 392 so that the position indicator 372 provides a suitable reading or display capability when the surfaces of the rollers 310 and 312 are just touching each other in so-called "kiss contact". When the motor 356 is rotated to increase the width of the strip at the nip 375, the reading device of the position indicator 372 will thus indicate the pressure or width of the strip at the nip 375.

The motor 356 is preferably via lines 402 and

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404 driven by a suitable electrical energy source 400 when a switch 405 is closed. The motor 356 is disconnected from the power source when the switch 405 is open, and is reversed when connected to the terminal 404a.

The switch 405 is preferably located adjacent to the side crimping of the printing station or on a console of the printing press, so that the adjustment of the pressure in the gap 375 can be remotely controlled.

It will be appreciated that a pressure adjustment means 355 is disposed adjacent each of the two support plates 302 and each of the transportable ink reservoirs 300 so that the strip is independently adjustable at the nip 375 at each end of the take-up roll 310. In order to impart motion to the lug 354 of the hanger 350 for adjustment of the gap 375 which would not be necessary in a remote control, suitable means such as a screw means may be provided.

The lock brackets 328 and 330 have bevelled ends 328a and 33Oa, respectively, which extend obliquely forward from top to bottom and face the end of the ink tray 320 on which the remote controlled adjustment means 355 are supported. The opposite end of each latch support 328 or 330 has in its interior a recess in which a spring is disposed which presses against the latch support 328 and 330, respectively, and a pin 422 in a direction away from the respective beveled shoulder 328a and 33Oa direction suppressed.

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Between the side frames 2 and 4, a support structure 4 50 is arranged, by means of support brackets 4 5Oa for supporting the transportable color reservoirs that are used in the printing press. The support structure 450 has a main support plate 451, a lower mating support plate 452 extending substantially parallel to the main support plate 451, and spacer beams 453 and 454 extending between and along the support plates 451 and 452 and connected thereto by screws 455. Inwardly tapered shoulders 456 are provided on each side of the main support plate 451 to receive a clamp 460 to be connected to each of the portable paint reservoirs.

Clamp 460 permits movement of each ink reservoir 300 along support structure 450 to allow for adjustable positioning of the respective ink tray 30 relative to the respective impression cylinder, and has a frame with spaced apart side walls 462 and 464 which are substantially integral extend parallel to the locking beams 328 and 330 and are arranged close to them. A locking bracket 466 is connected outside of each side wall 462 or 46 4 by screws 470 to the side walls 462, 464. The locking brackets 466 have clamping shoulders 472 and 474, which form complementary locking angles for the support plate 451 and the pins 422, respectively. The sidewalls 462 and 464 have threaded bores 462a and 464a which extend in the longitudinal direction of the sidewalls 462 and 464, respectively. encryption

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Locking screws 476 and 478 have heads 476a and 478a, respectively, located at one end and threads 476b and 478b at the other end threaded into threaded holes 462a and 464a, respectively. The screws 476 and 478 terminate in tapered shoulders at the threaded end so as to engage the tapered shoulders 456 of the main support plate 451. Accordingly, the side walls 462 and 464 are secured to the support structure 450 by the heads 476a and 478a of the screws 476 and 478, in which they engage the main support plate 451 on the tapered shoulders 456 to provide a C-type clamp connection. After attachment, a locking nut 480 provided on each screw 476, 478 is rotated against a shoulder of each side wall 462, 464, respectively, thereby maintaining the locking action.

A slide block 500 is attached to each side wall 462 and slidably by screws 502 which extend through slots 500a and 500b, respectively. A threaded bore 500c extends substantially parallel to the slots 500a, 500b and is substantially aligned with the locking beams 328, 330.

An adjustment screw 504 has a head 504a from which extends a shaft 504b in a threaded portion 504c which is threaded into the threaded bore 500c. By rotation of the head 504a, the shaft 504b moves longitudinally through the threaded hole 500c with the outer end meeting the shoulder 328a and 33Oa, respectively, to urge the locking beams 328 and 330 toward the locking bracket 366, respectively. Accordingly, by adjustment

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the adjusting screw 504, the ink tray 320 and the applicator roll 312 moves in the direction of the metering roller 12 and in depressed relative position, while the ink tray 320 is attached to the clamping device 460.

In order to provide for the possibility of a return movement of the ink tray for cleaning, without having to readjust the adjustment screw 504, there is provided a means 510 for allowing rapid retraction of the ink reservoir 300. This means 510 has a shaft 512 rotatable in the side walls An eccentric cam 514 is connected to each end of the shaft 512 by a pin and is engaged at its periphery with a shoulder of the slide block 500. Between the cams, there is a handle 518 for rotating the eccentric cams 514 By such movement, the slide block 500 and the adjustment screw 504 are moved in a direction that allows the end of the adjustment screws 504 to disengage the chamfered shoulders 328a and 33Oa, respectively Removal of the ink pan from the clamping device is possible.

As shown in solid lines in Fig. 7, the radial distance of the surface of the cam 514 is selected such that counterclockwise movement results in the slide block 500 being slightly moved toward the metering roller 12 and continued movement in the counterclockwise direction, as indicated by dotted lines in FIG. 7, causes the ink tray 320 to be disengaged from the clamping device 460, in which movement of the sliding member 460 is disengaged.

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block 500, which carries the adjusting screw 504 away from the locking bracket 466.

As shown in FIG. 8, an adjustment screw 520 is provided in the side walls 462 and 464 to lock the handle 518 in position thereby preventing rotational movement and unlocking of the ink pan 320 from the clamp 460. If desired, this adjustment screw or the like by a locking device with locking tines. be replaced, in which case the result is the same.

A lock nut 522 is threaded onto the threaded portion 504c of the adjustment screw 504 to hold the adjustment screw 504 in place or lock in that position when the adjustment has been made.

A stop 524 may be provided on the shaft 512 which cooperates with stops 526 and 528 provided on the parts 462 and 464 to limit the rotation of the handle 518 of the quick reset means 510. This is shown in Figs. 7 and 9 with solid and dash-dotted lines.

A remote controlled means 355 may be removably attached to the ink pan 320 by means of a bracket 530 having a T-slot 532 for mounting the housing of the adjustable support means 355. A T-shaped bracket 534 is attached to the end of the paint tray and engages the T-shaped slot 532

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Slidably, in a direction perpendicular to the direction in which forces are applied to the gap 375 when the take-up roll 310 is brought into pressure engagement with the applicator roll 312.

As can be seen from Fig. 10, a plurality of individual ink reservoirs may be provided across the width of a printing press for each page on the printing cylinder, so that therefore for ink cylinders 112a, 112b, 112c and 112d ink reservoirs 300a, 300b, 300c and 30Od are present. For example, in such an embodiment, if the cylinder 112c is not used, the handle 518 of the paint reservoir 300c may be turned down as shown to remove the paint supply to the cylinder 112c. When only the right part of the cylinder 112c has a plate and the cylinder 112d is not used, the ink reservoir 30Od is removed and the ink reservoir 300c is moved to the right to apply paint to the right side of the cylinder 112c.

As shown in FIG. 11, ink reservoirs according to the present invention may be the size for a single page, as in the case of the ink reservoirs 300a and 300b, or-for example, twice the size of the ink reservoir 30Oe Supply press cylinders with printing plates 112a and 112b each one page size and 112e a double page size with color.

Claims (5)

2 2 4 9 8 5 -st- 213 56 Invention entitled; A method of dosing paint to be applied by means of a roller assembly to a printing plate, wherein the roller assembly is rotated so that the peripheral surface speed is substantially equal to the peripheral speed of the printing plate, characterized by the following method steps: positioning a metering roller in impressing, mutual pressure engagement with the roller assembly for the formation of a Farbdosierspaltes; Feeding paint from a first and a second roller to the metering nip; Rotating the first and second rollers and the metering roller such that each adjacent surface sections move in the same direction to form a paint film on the metering roller; Positioning the metering roller in mutual pressure engagement with the roller assembly; and rotating the metering roller such that the surface peripheral speed is less than the circumferential speed of the Y / alzen assembly. 2. Apparatus for carrying out the method according to item 1, characterized in that one of the ink pan (320) rotatably supported applicator roll (312), is to be delivered by means of which color; a pickup roller (310) rotatably mounted on the ink tray (320) for supplying ink to the applicator roller (312); and adjusting means connected to the ink tray (320) for providing the ink tray (320) to be adjustably positioned on the frame of the printing press relative to a printing cylinder (112) of the printing press. - t - 224985 - ³⁵ " 3. The device according to item 2, characterized in that adjusting means are provided, by means of which the .Aufnahmewalze (310) for the purpose of controlling the amount of ink delivered relative to the applicator roll (312) is set, 4. Device according to item 3, characterized by in that remote control means are provided by means of which the adjusting means can be remotely controlled at a location remote from the location of the ink reservoir (300). Device according to items 1 and 2, characterized in that the inking unit comprises roller means (e.g., 10, 90) for supplying the printing plate (112) with ink; a roller (12) engaging the roller means for metering ink onto the roller means; a means (69) for changing the rotational speed of the ink metering roller (12) for controlling the slip between the ink metering roller (12) and the roller means (10); and first and second rollers (310, 312) for supplying ink (14a) to the ink metering roller (12) for use on the printing plate (112) of the printing press. For this ... Z. ... pages drawings