DD142684A5 - ESTABLISHMENT DEVICE FOR INCORPORATING THE PRINTING PRESSURE PRINTING COMPONENTS - Google Patents

Description

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Dyeing device for coloring the printed parts of printing presses

Field of application of the invention

The invention relates to the field of printing technology and can be used in the inking of printing presses for letterpress, offset printing, flexographic printing or other printing methods.

Characteristic of the known technical solutions

The inking systems, which are equipped with almost all pressing presses, have the same similarity and allow to use a single ink per print.

They consist of the following parts and work in the following way:

An ink fountain serves as a supply and dispenser of printing ink which is dispensed under the deformation of a flexible steel plate supported on a metal cylinder called a "transfer roller". The ink passes between the plate and the "transfer roller" and forms on its surface a more or less thick film depending on the pressure exerted on the back of the plate by adjusting screws.

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A set of soft rollers, alternating with metal cylinders, transfer and modify the paint film to properly dispense it for dyeing. Depending on their designers, the desired thickness and quality of the ink application, the number, the diameter and the arrangement of the rollers and cylinders are very different.

With this inking principle, the ink fountain only allows an approximate regulation of the ink film thickness in areas with a width of approximately 20 to 40 mm. The "transfer roller" generally has a variable and controllable feed.

The film deposited at the outlet of the paint box is relatively coarse and unsuitable for good coloration. Its refinement is achieved by any spreading roller which stretches, laminates, kneads and homogenizes it. The paint rubbing cylinders participate in and complete this action; they are called "rolling rolls" for their rotary and axial movement. They regulate the thickness of the film per zone and prevent the circular beads resulting from surface tensions of the printing ink.

The film which dyes the printing parts of the press must have a perfectly regular and constant thickness in a certain zone. The allowable tolerance, in one more or less, is on the order of 2 to 3 microns.

The paint forming the film must, depending on the vehicle, the type of printing and various factors, have a certain fluidity, which, owing to its constituents,

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their possible additives and by the mechanical effect of the inking unit is determined. The quality of the paint job determines to a great extent that of the print.

The commonly used inking units make it possible to meet these requirements to a great extent. They have, however, in addition to their significant space requirements, a certain number of disadvantages:

Inaccuracy of control in the thickness of the paint film in narrow zones, which makes it difficult to juxtapose lean print in planographic printing.

Unjustified consumption of printing ink if the surface to be printed is negligible compared to the total printing surface of the machine. This consumption is very high for small, successive prints, which are printed in different shades ^.

At the beginning of a print, the color balance is only present after printing a certain number of copies, resulting in a waste of paper.

This type of coloring is moreover completely unsuitable for the processing of inks of different shades in one print because of its basic principle. In fact, the "dressing rolls" rapidly mix the inks and the ink fountain does not allow to dispense and regulate narrow widths of ink films that have different shades.

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In order to try to weaken this restriction, some solutions have already been created. They all maintain the same printing principle and, with more or less different methods at the point of consolidation of inks of different shades, use discontinuous grooves arranged on the spreading rolls or on the Y / alts cooperating with them, to provide discontinuity zones or remaining ones Stripping ink resulting from the mixing of the distribution rollers. These methods are only superficially effective, poorly adapted to the successive prints, very different from each other and often very inadequate. Without mentioning the color box, the very fact of having to make special "dressing rolls" on each different print imposes a constraint on the printer, which in the great majority of cases is incompatible with the realized time savings and in practice the interest in this Process suppressed ·

In fact, the printer that wishes to obtain a multi-color print is forced to process each color in turn, which requires as many passes through the press as there are colors, except for three- or four-color prints using clichés In principle, the overlaying of three basic colors permits the realization of any coloration. "These prints, however, are limited to certain types of printing and require at least three or four passes through the press.

This reality is detrimental to the fact that it is possible to perform multi-color prints with good results.

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French patents Nos. 1 275 206 and 1 341 700 and US Pat. No. 7,316,777 have shown solutions with the intention of simplifying the classic inking apparatuses and thereby eliminating almost the entire set of cylinders and distribution rolls.

In these known solutions, the basic idea is to provide a single color film which is laminated and metered by squeezing two cylinders, one of which is metallic and the other covered with a soft material so as to directly color the offset plate , This method does not allow zone-wise thickness control of the film, nor does the occasional sealing of inks with different hues. This system may be sufficient to offset to process a hue or ink type where theoretically each dot of the sheet receives the same amount of ink, but almost all in-service offset presses are still equipped with inking units each equipped with regulating screws are similar to those used in book printing.

In letterpress printing, and especially in the case of a platinum printing press, where pressure regulation is very sensitive to the grease differences in the printed parts and is closely correlated with the coloration, it is inevitable to regulate the thickness of the color film per zone.

Depending on their nature or their hue, the inks show different densities and different flow behavior and require to achieve a given

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Coloring different thicknesses.

In order to realize an offset or letterpress inking unit which may process multiple colors at once, where each film must be given a proper color, one must necessarily consider this factor and provide it with a narrow range control so that the printer the possibility is given to give "ribbons" of small width.

Object of the invention

The aim of the invention is to provide a more economical high-use inking device for inking the printing parts of printing presses.

presentation; the essence of the invention;

The invention has for its object to provide a coloring device for coloring the printing parts of printing presses, which allows high-precision printing and ensures one or more color film of different colors or different texture to homogenize and micrometrically zuzumessen.

To achieve the object, a coloring device is now provided, which is characterized in that it is formed by a rotating inking device which laminates, processes, homogenizes and outputs with great accuracy one or more films of printing ink of different shades or of different nature, by narrowing these films micrometrically

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Strips strips, wherein the inking device in combination simultaneously serving as inking cylinder and as a color table metal cylinder and a set of joint-tight plates which are independently actuated by means of a screw and a lever, wherein the lever a fine adjustment differential movement. has effect to achieve a mikronweise thickness regulation of the film.

Conveniently, it is provided that the inking cylinder, which serves in the same way as a color table, is formed of multiple ribs and is designed as a thermal radiator, wherein the ribs are covered on the surface of a hard chromium-plated, smooth-ground or feinmattierten metal ring.

It is furthermore advantageous if platelets are provided as Einfärbllamellen, which are close together and are independent of each other ·

It is also convenient for each platelet to have a narrow width (5-10 mm) to allow the regulation of delivery of narrow color and different hue print color films. As low has been found that the entirety of the closely juxtaposed platelets is ground in place on their carrier and is fine-grained on its cooperating with the color table part, except in the case where it is coated with an elastomer.

In a further embodiment of the invention can also be provided that the inking plates are replaced by a single, non-deformable blade to a color film

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of uniform thickness over the entire width of the lamella, the thickness of which can be controlled micrometrically.

Also, according to the present invention, in the case of simultaneous printing of colors of different hue or texture, the pigment density of the inks can be determined either by deconcentration (thinning) of high pigment-containing colors by means of a conventional transparent additive or by pigmenting a low-concentration color with pigments the same kind is regulated »

In the context of the invention is also that the color table is coated on its surface with a hardened elastomer to colorize the printed parts directly.

It is expedient in this context, if the coated with an elastomer color table is protected from the pressure with the help of a paint coating at the points where the paint partitions work.

As a favorable training has also been shown when a sheathed with elastomer cylinder for transferring the ink film from the metallic color table on the printing plate or the printing plate and its passage exactly corresponds to the passage of the printing plate or plate carrier.

It is also advantageous that any translational movement of the dampening rollers is prevented in the case where printing inks of different hue or different texture are processed simultaneously.

In a further embodiment of the invention can be provided that the partitions, which divide the color films into fields, are made of a microporous material, the

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suitable to be soaked with water or other liquid or wax, acting as an ink repellent or as a lubricant for the partition.

Conveniently, it is also envisaged that the partitions are made of a strip or semi-strip material of Polyurethanangle and can be lubricated during operation. To limit the heating and wear.

Preferably, the partitions that divide the color file into patches have a very small thickness of a few tenths of a millimeter to allow for ink films that are very close to each other. , · -

The advantages of the invention are now based on the fact that one or more color films which are suitable for coloring the printing parts on a metal cylinder serving as a color table can be formed directly. The thickness of this film or films is for each narrow strip micrometrically adjustable. This apparatus makes it possible to omit the "distribution roller train" and the "distributor rollers" and to classify inks of different hue or various characteristics into fields of high accuracy directly in this rotary inking unit.

In addition, it is now possible to omit the "application rollers" and color the printing parts directly with the help of a Spezialmetallzy Linders, which acts as a heat radiator and is coated with a solid elastomer * whose softness practically not on the color layer

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participates. In this embodiment, the separators may be made of soft, self-lubricating materials of the Teflon type, wherein the elastomeric coating is protected with a lacquer so as not to injure it in places where the color separators operate.

It is also possible to preserve the metallic color table and incorporate into the device a cylinder which is coated with an elastomer and serves to transfer the ink layer from the color table to the printing plate or printing plate. The passage of this cylinder corresponds very closely to that of the plate or plate carrier, so that the color drips back to the same places with each revolution of the cylinder.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing show:

Fig. 1: a side view of the device according to the invention, in section;

FIG. 2 shows a side view of the device according to the invention according to FIG. 1, shown partially and enlarged; FIG.

3 shows a plan view of the inking platelets;

FIG. 4: a side view of the adjusting device for the inking platelets.

The inventive device sum applying a or

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several colors can be inserted into a planographic press (printing press with board). This type of inking mechanism, described below, relies on extreme mechanical precision and, at the level of the active parts where they are erected and dispenses the ink layer, requires manufacturing tolerances on the order of + 2 "to 3 microns.

The selection and the fineness of the cut of the steels used also play an important role in this realization.

The frame of the device is formed by two flanges 1 which are interconnected and stiffened by two keyed crossbars 3. This frame carries two movable flanges 2, which pivot under the action of two eccentrics 13, which are controlled by a support arm of the actuating lever 14. This feature suppresses the inking of applicator rollers by removing them from the color table.

A color table 4 connecting the two movable flanges 2 receives the ink layer. It is equipped with two axles, which rotate in two bearings 28 with double bearings whose clearance adjustment takes place automatically. The staining table 4 is formed inside ribs 30 which serve as a thermal radiator to dissipate the calories produced by the surface heating during the rolling out of the colors and by the friction of the partitions 15 separating the ink layers in the case of multi-color printing. A hard chrome-plated ring 29 on a few tenths of a millimeter thick, covered to improve adhesion and the overlay of the paint film

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these ribs 30. The color table. 4 has been carefully sanded before matting. A set of gears 12 derives its movement from the board and drives the color table 4 at. The applicator rollers 11 apply the ink directly to the stage 4, where the ink layer is restored at each revolution.

A support 24A for the entirety of the partitions 25A designed as platelets 25 for regulating the paint box and its fixing screws 2βΑ is fixed by means of two screws 7 on the movable flanges 2 and rests on two tempered and ground steel shoes 6. This support 24A is removable, to allow the cleaning of the paint box.

A spindle carrier 20 and a regulating screw 18 are fastened tightly to the carrier 24 with a high-strength screw. The screw 18A acts on the fine adjustment lever 19A, which displaces the plate 25 and allows its regulation. Each tile 25 is operated independently. The carrier 24 and the spindle carrier 20 are made of a high strength, tempered and ground steel.

Each plate 25 consists of a tempered steel, a kind of spring steel, which combines hardness with elasticity. The 35 plates 25 which make up this device are tempered and ground on all their surfaces.

A manufactured in the same way from tempered steel part 31 serves the plate 25 as a stop angle. It is solidly fixed to the carrier 24 and ground square at right angles.

The assembly of the plate 25 on its carrier requires the

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greatest care · Before assembly, the whole of the elements is immersed in a solvent and dried with compressed air. The first plate 25 rests on the stop angle serving as part 31 and is fastened with a force measuring key. The following plate 25 is supported prior to its attachment to the first and immediately to the last plate 25, which is then itself held by a locking member 32 which holds the whole height together the whole of the plates 25 and prevents any deformation. A main joint seal 21 is positioned and protects the entire mechanical regulator from contamination. The platelets 25 abut each other seamlessly and can move relative to one another without changing their respective setting, being color-tight and lying in zero position against a stop 23 which forms a basic pitch equal to each platelet 25. The totality of these platelets Fig. 25 illustrates a single sipe which is dressed and finely ground on its part acting on and cooperating with the color table 4. The ink entrained by the squeezing table 4 disperses and homogenizes to form a suitable film for printing, which is used regularly for the ink supply 27 ', which is located between the color table 4 and the wafer 25. The thickness regulation of the ink film is variable from microns to microns, one revolution of the screw corresponds to about 10 microns An eccentric 9 and its operating lever 8 regulates the general application of color and works through elastic deformation of the b eiden movable flanges that carry the color box.

The entirety of the positioning screws 5 allows the exact positioning of the ink fountain box with respect to the

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Color table 4 · The whole of the platelets 25 is set under minimum pressure with a distance of approximately 5 microns from the color table 4 and must not touch it in order to avoid abnormal wear of the platelets 25 and disadvantageous heating of the device.

A partition support 16 and movable partitions 15 and their support screw T7 ensure the separation of different printing inks. A pressure roller 10, the. Rubber having a hardness of about 70 Shore _, evened out the color film in that part where the grain contains impurities.

The partitions 15 are made of either a hard or semi-solid material, such as polyurethane, high molecular weight polyethylene, etc., which are lubricated during the printing process by means of a sliver or other known method to limit heating and wear, or they are off made of a microporous material. This material is then impregnated with wax before use or impregnated with a lubricating fluid and possibly with an ink repellent agent such as silicone. The water that works on a chrome finish is equally a good ink repellent.

As a non-limiting example, the production of a partition causing very little heating will be described below.

A feltboard of about 500 grams per square meter with a thickness of one millimeter is coated with a quench of about 15 % dry extract of a sealed polyurethane

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or epoxy resin is impregnated to fix the fiber and then impregnated again with the aid of a wax having a softening point of about 90 ^° C. After cooling, the dividing wall is trimmed and subjected to finishing · Then the dividing wall becomes its with the platelets and the table parts in contact - coated by immersion with hard mastic, which resists the printing of the laminated ink and ensures complete tightness. This mastic is made on the basis of wax and synthetic resin. According to the nature of the papers and the color types used, a structural gel can be added to the printing ink prior to printing.

Another embodiment of the invention relates to a simplification in the production of the inking unit and is particularly well suited for the construction of semi-offset presses. In this embodiment, the regulation of the color output in narrow stripes is omitted and the whole of the inking chips 25A is replaced by a single, non-deformable and finely ground blade, the general regulation of which is obtained in the same way as in the case of the closely adjacent platelets.

With this type of process and in the case where one works simultaneously with inks of different hues or different properties, it is indispensable to be able to modify the pigment density of the inks depending on the intensity of the hue to be achieved, in order to control the color release by stripes replace. In fact, with the same hue, the intensity is also variable in direct correlation with the pigment density of the colors. A simple procedure that

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it is possible to change the pigment intensity of a printing ink as desired, is given below by way of non-limiting example.

All printing inks used have a high content of pigmentation and, if appropriate, are concentrated by means of a conventional, transparent additive, depending on the desired intensity. The regulation of the basic coloring is turned off to the densest color tone and the other color tones are modulated by the latter. The reverse process can likewise be practiced by adding pigments of the same type to inks requiring this addition. A density meter allows this regulation to be carried out with precision and ease *

The devices which serve to supply the offset presses with water are of various types. Some devices, such as mainly semi-professional machines, add the water directly to the ink. However, the majority of commercial machines have one or more salt called "dampening rollers" which add the required water to the plate. Some of these rollers are given a rotating and a translational movement.

In the majority of cases and depending on the nature of the colors, it is very difficult to prevent the water from spreading. easy to mix in the color. Although it is desirable to work simultaneously with inks having different hues or qualities, it is essential to avoid any translational movement of the "dampening rollers" in order to avoid that the water that is mixed with a printing ink of a

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Color tone works, with the ink comes in contact with a different hue.

Several particularly interesting applications result from this process and can be obtained by incorporating less voluminous inking units in existing letterpress or offset presses, which are more accurate and practical than the original ones, and which also allow multiple inks to be used simultaneously that have a different texture or different color tint.

In addition to the great possibilities offered by the process in all conventional printing houses, it is reserved for a wide area for the printing of labels, paper, packaging cards, etc. The fact that only in certain places to have to color the printing unit, without being forced to colorize the whole machine, allows large, very significant savings in ink, especially when it comes to short, consecutive prints in different shades and where the printing surface is small is compared to the overall format of the machine.

Claims (15)

is · 212 075 25.7 * 1979 APB41F / 212 075 55 321 27 invention claim Coloring device for coloring the printing parts of letterpress, offset printing, flexographic printing presses and the like, characterized in that it is formed by a rotating inking device which prints with great accuracy one or more films of printing ink of different shades or of laminates, processes, homogenizes and outputs them by micrometrically sizing these pillows into narrow strips, the inking device having in combination both a coloring cylinder and a color table (4) serving as metal cylinder and a set of joint-tight platelets (25) independently operable by means of a screw (18A) and a lever (19A), the lever (19A) having a fine adjustment differential movement action to achieve micron-wise thickness regulation of the film. Dyeing device according to item 1, characterized in that the inking cylinder, which likewise serves as a color table (4), is formed by multiple ribs (30) and is designed as a thermal radiator, the ribs (30) forming on the surface of a hard-chromed, smooth-cut or fine-matte metal. ring (29) are covered. 3 · Device according to the points 1 and 2, characterized in that as Einfärbllamellen platelets (25) are provided, which are close to each other and are independent of each other. 19 - 2 1 2 07i 25.7.1979 APB41F / 212 075 55 321 27 4 · Dyeing device according to item 3 »characterized in that each plate (25) has a small width (5-10 mm) in order to permit the regulation of the dispensing of narrow-width and different color printing ink films The staining device according to item 4, characterized in that the entirety of the closely adjacent plates (25) are ground in place on their support and are finely ground on their part cooperating with the color table (4), except in the case where this is covered with an elastomer · 6 * coloring device according to the points 1, 3, 4 and 5, characterized in that the inking plates (25) by means of a fine adjustment lever (19A), which is actuated by a screw (18A), are micrometrically adjustable. 7. »Dyeing device according to the preceding points 1 to 6, characterized in that the inking platens (25) are replaced by a single, non-deformable lamella to obtain a color film of uniform thickness over the entire width of the lamella, the thickness of which can be controlled micrometrically is · Dyeing device according to item 7, characterized in that, in the case of simultaneous printing of colors of different hue or of different composition, the pigment density of the printing inks is obtained either by deconcentration (thinning) of high-pigment-containing colors by means of a conventional transparent - 212 25.7 * 1979 APB41F / 212 075 55 321 27 Additive or by pigmenting a low concentration color with pigments of the same kind. 9 · inking device according to one of the preceding points 1 to 8, characterized in that the color table (4) is coated on its surface with a hard elastomer in order to color the printing parts directly · 10. inking device according to item 9, characterized in that the sheathed with an elastomer color table (4) is protected from the pressure with the aid of a paint coating at the places where the Därbtrennwände work. Dyeing device according to items 1, 2, 9 and 10, characterized in that an elastomer-coated cylinder is used for transferring the ink film from the metallic inking table (4) to the printing plate or printing plate and its passage is exactly the passage of the printing plate or printing plate Cliché carrier. equivalent. 12. inking device according to any one of the preceding points 1 to 11, characterized in that any translational movement of the dampening rollers is prevented in the case where printing inks of different hue or different texture are processed evenly. , 13 · Dyeing device according to one of the preceding points 1 to 12, characterized in that the partitions (15) which divide the color films into fields »out 212 07 5 25.7 · 1979 APB41F / 212 075 55-321 27 a microporous material suitable to be impregnated with water or other liquid or wax to act as a repellency or lubricant for the partition (15) Dyeing device according to one of the preceding points 1 to 13 ", characterized in that the partitions (15) are made of a rigid or semi-rigid material of the polyurethane type and can be lubricated during operation in order to limit heating and wear. Dyeing device according to points 13 and 14, characterized in that the dividing walls (15) which divide the color films into fields have a very small thickness of a few tenths of a millimeter in order to allow printing ink films which are very close to one another. Hierciles drawings