CS251092B2 - Disk or sheed-fed rotary for simultaneous multicolour first and back-up printing - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll or sheet-fed rotary printing machine for simultaneous multicolour face and reverse printing, in particular for printing security stock on securities, in particular banknotes, provided with a first pair of rubber rollers. one inking unit of another color and interacts with the respective rubber cylinder of said first pair of cylinders and transmits a multicolored image thereto. The rotary machine is further provided with a second pair of rubber rollers, each interacting with a roller contacted with one or the other of said first pair of rubber rollers.

A rotary machine is known in which an image with side-by-side colors can be printed on one side of the paper. This image is printed using a single high-pressure printing plate, provided with a complete printing pattern and placed on the plate cylinder. This high-pressure printing plate is dyed with a color collecting roll consisting of a rubber roll dyed with a plurality of color selection rollers corresponding to the number of colors of the printed image. Each dye selection roller is provided with cut-out relief areas which represent portions of the image dyed with a particular color, taking the corresponding color from its own inking unit. This rotary printing machine is used primarily for printing security banknotes.

Generally known as "Orlof" printing or collecting color printing, a multi-color image is obtained with perfect coverage between the different colors of the pattern, which cannot be achieved by any other printing process. Since the dye selection rollers are in contact with the ink collecting roller by their resilient surface, they can be made of a hard material, which allows engraving of very fine relief areas and thereby obtaining a very fine color area of lines or dots.

Otherwise, indirect high-pressure printing or offset printing with overlapping colors and printing patterns, also frequently used for printing the security substrate, is already known.

Further known are machines of this type for simultaneous face and reverse printing, in which the paper runs between two rubber rollers, each of which produces a multi-color image by corresponding plate rollers.

On the basis of the prior art, a rotary printing machine has been developed enabling the previously described printing methods, one or the other, each separately.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-color printing machine which, according to the choice of mo251092, is capable of performing both said printing methods, namely "Orlof" and offset printing, and both printing methods simultaneously, to achieve "Orlof" printing printing on the other side of the paper and which would allow a simple transition from one printing method to the other.

According to the invention, the invention has been provided for a web or sheet-fed rotary printing machine for simultaneous multi-color face and reverse printing, in particular for printing security paper on securities, in particular banknotes, with one first pair of rubber rollers. each of which is dyed with a different inking ink and is in contact with the rubber rollers to transfer a multicolored image thereto, one second pair of rubber rollers and two plate rollers, one of which is arranged between the rubber rollers of the first and second pair and the other between the other the rubber rollers of the first and second pairs, such that the path of the printed paper web lies between the two rubber rollers of the second pair of rollers and the two rubber rollers of the first pair of rubber rollers displaceably adjusted from the mutual pressure position to the mutual spacing position; on each side of the printed paper web, each of the arranged plate rolls is also displaceably adapted to engage and out of contact with the two adjacent rubber rollers, wherein the rubber rollers of the other pair are displaceably adjusted from the mutual downward position to the mutual apart position.

Further, according to the invention, a transfer roller is provided between the two rubber rollers arranged on both sides of the plate roll in contact with the two rubber rollers.

The advantage of the rotary press according to the invention lies not only in the technical solution in that it enables not only the two different printing processes to be carried out separately, but also both printing processes simultaneously. It is also of economic importance since the user can choose the printing process without having to use three separate rotors. The repairs that must be made to the machine when switching to other types of printing are very simple.

In the case of a sheet-fed roller, the structure is designed such that an intermediate roller is disposed between one of the rubber rollers of the second pair of rollers and the rubber roll of the first pair of rollers provided on one side of the machine. They are configured as a transfer sheet roller, the arrangement being such that when said rubber roller of the second pair of rollers transmits an image to the sheets, an opacity occurs between said printed sheet and the multicolored image on said roll of the first pair of rollers when said roller arrives in contact with the sheet.

The invention will now be described in detail by means of two exemplary embodiments, illustrated in the accompanying drawings, in which:

Giant. 1 shows schematically the position of all disc rotary organs when printing "Orlof"; FIG. 2 schematically the same machine for offset-offset printing, FIG. 3 schematically the same machine for offset-Orlof printing, FIG. 4 schematically the same machine for offset-printing, wherein the two halves of the machine are in comparison with the embodiment of FIG. Fig. 5 shows schematically the position of all sheet fed organs when printing "Orlof - Orlof", Fig. 6 schematically the same machine, when printing "offset - offset", Fig. 7 schematically the same machine, when printing "offset - Orlof" and FIG. 8 schematically shows the same machine when printing " Orlof-offset ", the two halves of the machine being interchanged compared to the embodiment of FIG.

The illustrations differ only in the arrangement of certain organs, but all identical parts are designated with the same reference numerals in all figures.

1 to 4 is provided with the inlet rollers 2 of the paper web 1 and with a device 3 for dust removal and static dissipation. The paper web 1 can be printed either between the two rubber rollers 4, 14 by the "Orlof - Orlof" process (Fig. 1), by the "Orlof - Orlof" process (Fig. 3) or by the "Orlof - offset" process (Fig. 4). or between the large rubber rollers 6, 16 by the "offset - offset" procedure (Fig. 2) After printing, the paper web 1 is led out of the machine by the output rollers 10. The direction of rotation of the rollers is indicated by arrows.

For "Orlof - Orlof" printing, the two large rubber rollers 6, 16 are pushed together (Fig. 1), while the rubber rollers 4, 14 are pressed together. In practice, this displacement can be carried out very simply, as indicated by the large rubber rollers 6, 16, namely the eccentrics 7, 17, in which the bodies of each of the large rubber rollers 6, 16 are housed. and when the machine is out of order to move both cylinders apart. When the eccentrics 7, 17 are rotated, the axis of the rubber rollers 6, 16 is shifted. However, when the two rollers are moved apart, the distance between them is very small, only a few mm, the distance shown in FIG. 1 being exaggerated for clarity.

The rotary press consists of two symmetrical halves, of which only one is described, namely the right half.

In the exemplary embodiment of FIG. 1, the large rubber roller 6 is in contact with four dye selection rollers 8 provided with engraved reliefs 8a according to the outline of the areas printed with the respective color, each of which is dyed with a inking unit 9 provided with a double dye box. These dye selection rollers 8 with reliefs 8a are preferably made of a hard material which is free of deformation, especially if the relief is very fine, so that very fine lines can be obtained from which the security substrate is formed. The four-color areas are transferred to a large rubber cylinder 6, which acts as a paint collecting cylinder and on which the ink collects and is transferred by it to a single plate cylinder

5, provided with a high-pressure printing plate 5a contacting the collection cylinder. This high-pressure printing plate 5a is provided with a complete four-color printed printing pattern. The complete, four-tinted image is transmitted to a rubber cylinder 4 of smaller diameter than the large rubber cylinder 6 and is in contact with the rubber cylinder 14 of the other half of the machine to apply pressure to the respective side of the paper.

At the same time, another image is applied to the other side of the paper by a rubber roller 14. This second picture is produced analogously by the corresponding organs of the second half of the rotary press, four embossments 18a, provided with color selection rollers 18 colored by four inking units. and plate cylinders 15 with a high pressure printing plate 15a provided with a complete printing pattern of the second image to be transferred to the rubber cylinder 14. During the simultaneous printing, the two rubber rollers 4, 14 serve alternately as pressure rollers.

If the same rotary press is used for offset printing (Fig. 2), it is sufficient to replace the dye selection rollers 8, 18 with the plate rollers provided with the printing plates 8b, 18b, push the two rubber rollers 4, 14 together, further slide the plate rollers 5, 15 away from the rubber rollers 6 and 18, respectively, and press the two large rubber rollers 6, 16 against each other to print the paper web 1. Thus, the rollers 4, 5, 14, 15 are out of order and are not driven because their drive assembly is disconnected from the rotary drive.

The printing plates 8b, 18b consist of offset printing plates, in particular high-pressure printing plates used for dry offset printing, provided with sub-patterns colored, as in the previous case, with inking units 9, 19. These differently colored sub-patterns are united on a large rubber roller 6 or 18 acting in this case as an offset rubber roller, i.e. as a collecting roller of sub-patterns folded into a multicolored image. This is obtained by passing the paper web 1 between the two large rubber rollers

6, 16 at the same time one multicolored dry offset printing on each side.

The adjustment of the distance between the different rollers, i.e. between the rubber rollers 4, 14, the large rubber rollers 6, 16 and between the plate rollers 5, 15 and the large rubber roll 8 or 16, as well as the necessary displacement of the other rollers relative to the rollers is carried out in a manner known per se, in particular so that all the rollers are supported in eccentrics, as already described in connection with the large rubber rollers 6, 16.

The displacements are very small distances of several millimeters. The inking units 9, 19 are generally mounted on mobile inking bogies.

The rotary press according to the invention also enables the printing of "offset" Orlof (Fig. 3). In this case, the delays of all the organs correspond to the "Orlof - Orlof" procedure shown in fig.

1.

In the illustrated embodiment, the right half of the rotary printing presses the "Orlof" dye selection rollers 8 and the plate roller 5 using a high-pressure printing plate 5s colored with a large rubber roller 6 acting as a color pickup roller and colored with the dye selection rollers 8.

The left half of the rotary press is offset by the plate rollers 18 provided with the offset printing plates 18b colored by the large rubber rollers 16. In this case, the image is transferred from the large rubber roll 16 by the image transfer roller 15 * to the rubber roll 14, replacing the transfer roller 15 '. In this case of simultaneous mixed printing, the offset image is then printed on the paper by the rubber roller 14 after being transferred by the transfer roller 15 '.

In the fourth procedure (Fig. 4), the two halves of the rotary machine are interchanged, which allows printing using the "Orlof offset" procedure. In this case, the left side of the roll prints the image of "Orlof", the color selection rollers 18 of the platen roll 15 and the high pressure printing plate 15a, and the right side of the roll prints the offset image with offset plates 8b carried by the rollers 8, 8b and transfer roller 5 '. .

This possibility of selecting pages in the case of simultaneous mixed printing is essential if the web 1 printed with the described rotary machine passes further through a further printing unit to obtain on at least one side of a second printing, for example a steel engraving forming the main pattern.

Figs. 5 to 8 show various modifications of the sheet-fed rotary press, for simultaneous printing "Orlof - Orlof" (Fig. 5), printing "offset - offset" (Fig. 6), printing "offset - Orlof" (Fig. 7) and "Orlof - offset" printing (Fig. 8). This rotary press and its modifications are practically identical to the modifications according to Fig. 1, Fig. 2, Fig. 3, Fig. The path of the sheet 21 is indicated by a thick line in Figures 5 to 8. The sheets 21 to be printed are guided in a known manner by a brake drum 22 and two grippers provided with transfer rollers 23. Unlike the path of the paper web 1, the sheets 21 are In the illustrated case, a pair of large rubber rollers 6, 16, as shown, with rubber rollers 4, 8 acting as gripper transfer rollers, is used to convert sheets 21 from roll 4 to roll 6 using an intermediate roll 24 equipped with grippers and in continuous contact with the two rubber rollers 4, 6. Once the sheets 21 have been printed, they are conveyed by the chain gripper assembly 25 to a storage space or to a rotary printing press, for example, a steel engraving printing.

In the "Orlof - Orlof" procedure (Fig. 5), the arrangement shown in Fig. 1 corresponds to that. The two large rubber rollers 6, 16 are pushed apart and act as collecting rollers colored with color selection rollers 8, 18 and themselves color the high-pressure printing plate. The ink cartridges 9, 19 are schematically shown with only a few rollers and are provided, for example, with the same components shown in FIGS. 1 to 4. The rubber rollers 4, 14 are pressed together and print the respective image on the rollers. both sides of the sheet 21.

In the example shown, the ratio of the diameter of the rollers 4, 5, 8, 14, 15, 18 and 24 to the large rubber rollers 6, 16, 1: 3 is thus the circumference of the large rubber rollers 6, 16 corresponds to the length of three sheets of paper 21. each carries three rubber scarves, while the rollers 4, 14 each carry only one rubber scarf.

The fact that the sheets 21 remain in contact with the area of the large rubber cylinder 6, on which the ink transferred to the plate cylinder 5 is not yet found, has practically no negative effect since the arrangement is such that the areas colored on the large rubber cylinder 6 when in contact with the printing image-bearing sheet 21 applied by the roller 4, they overlap with the colored areas.

In order to meet the protection condition, the respective rolls must be arranged as follows: sum of the circumferential length of the sheet 21, the plate cylinder 5 between its points of contact with the large rubber cylinder 6 and the rubber cylinder 4 as viewed between its point of contact with the plate cylinder 5 and the point where the paper enters the rubber cylinder 4 increased by the length of the trajectory of the paper sheet 21 between its point of entry into the rubber cylinder 4 and its point of entry onto the large rubber cylinder 6. the length of the sheet 21 on the large rubber cylinder 6 between its points of contact with the rolls 5, 24, increased by the peripheral length of the sheet 21 on the plate cylinder 5, equal to one third of the circumference of the large rubber cylinder 6. a large rubber roller 6, which was transferred from the roller 4 to the paper sheet 21 and fed by one from three rubber scarves to a large rubber roller 6, with the same image location on the next rubber scarf.

Since the paper sheets 21 do not exert any pressure on the large rubber roller 6, any transfer of color found on the large rubber roller 6 to the paper sheets 21 is very unlikely.

When printing using the "offset - offset" procedure (fig.

The two rubber rollers 6, 16 are pressed against each other and colored with offset printing plates 8b, 18b mounted on the plate rollers 8, 18. The rubber rollers 4, 14 are spaced apart from one another, the plate roller 5 is spaced from the rubber rollers 4, 6 and the plate roller 15 is spaced from the large rubber roller 16. The plate rollers S, 15 as well as the rubber rollers 14 are thus out of service, while the other rubber rollers 4 serve as sheet transfer rollers 21 of the paper conveyed by the transfer roll 24 to the large rubber roll 6 to be printed on both rollers 6, 16.

For "offset - Orlof" printing (fig.

7), the organ arrangement is shown in FIG. 5.

In the example shown, the right half of the machine prints, by the "Orlof" method, the dye selection rollers 8 and the plate roller 5 carrying the high pressure printing plate 5 colored with a large rubber roller 6, the large rubber roller 6 serving as a pickup roller.

The left half of the rotator prints the offset plate rollers 18, 18b with the offset plates 18b colored with the rubber rollers 16. In this case, the image from the large rubber roll 16 is transmitted by the image transfer roller 15 'to the rubber roller 14, replacing the image transfer roller 15' In the process, the plate cylinder 15 (FIG. 5) is formed by a rubber cylinder. Thus, in this case of simultaneous mixed printing, the offset image, when transferred from the image transfer roller 15 ne, is printed by the rubber roller 14 onto the paper sheet 21. As regards the contact between the paper sheet 21 and the large rubber roller 6, which is conveyed to the gripper chain assembly 25, the same remarks in connection with FIG. 5 apply.

In the fourth workflow (FIG. 8j, allowing "Orlof-offset" printing, the two halves of the rotary machine are interchanged and the left side prints the image by the "Orlof" process with color selection rollers 18, the image transfer roller 15 'being replaced by a plate roller 15 and high pressure. a printing plate 15a provided with a complete printing pattern, while the right side prints the offset image by offset plates 8b supported by the plate rollers 8, wherein the plate roll 5 is replaced in the above example by the image transfer roll 5 '.

In all the examples described, the color selection rollers 8, 18 having the collection function performed by the rubber rollers 6, 16 can be replaced by printing plates operating as color selection boards mounted on the roll. Therefore, in this case, when changing from one printing method to another, it is sufficient to change only the plates located on the rollers which are in contact with the respective rubber rollers, while the roll bodies can be used unchanged. Mito it can remain mounted cylindrical body of the plate cylinder 5, eventually 15, when transforming the function of this cylinder into a transfer cylinder 5 ‘or 15‘ of the image, if the high pressure printing plate is sufficiently thin and can easily be replaced by a rubber scarf and vice versa.

Optionally, the at least one printing unit may consist of a plate cylinder 8 and / or 18 and an inking unit 9 and / or 19 on one

Claims (2)

1. A disc or sheet-fed rotary machine for simultaneous multicolour face and reverse printing, in particular for printing a security backing on securities, in particular banknotes, with one first pair of rubber rollers, along the periphery of each of which a plurality of dye selection rollers each dyed with a different ink color and is in contact with the rubber rollers to transfer a multicolored image thereon, one second pair of rubber rollers and two plate rollers, one of which is arranged between the rubber rollers of the first and the second pair and the other between the second rubber rollers of the first and a second pair, characterized in that the path of the printed web (1) lies between the two rubber rollers (4, 14) of the second pair of rollers and the two rubber rollers 92 and / or the other side replaced by a wet offset printing unit, plate cylinders are provided Offset printing plate for wet offset printing. In addition, the direction of the paper transport and the direction of rotation of the rollers can be changed without further delay in the described disk rotors; in this case, the paper runs from the bottom up and it is only necessary to connect the paper dust removal and static removal device 3 at the bottom of the machine inlet. BACKGROUND OF THE INVENTION or (6, 16) of a first pair of rubber rollers, displaceably adjusted from a mutual pressure position to a spaced apart position, and on each side of the printed paper web (1), each of the arranged plate rollers (5, 15) is also adjustable for contact adjacent rubber rollers (6, 4; 16, 14) and out of contact with them, the rubber rollers (4, 14) of the second pair being displaceably adjusted from the mutual downward position to the mutual apart position. Disc or sheet-type adjustable rotary roller according to claim 1, characterized in that a transfer roller (4) is provided between the two rubber rollers (4, 6) arranged on both sides of the plate roll (5) in contact with the two rubber rollers (4, 6). 24).