FI78644C - Collecting pressure rotating machine printing device for printing value apps - Google Patents

Description

78644

Aggregate frame printing rotary printing machine for securities printing

The invention relates to a printing device for a security printing machine according to the type definition of claim 1 for the printing of securities.

Aggregate frame printing-rotary printing machines for indirect letterpress printing are already known. In such machines, however, a plurality of frame cylinders carrying embossing plates are arranged around the rubber cylinder. A color device is provided for each frame cylinder blade. The rubber cylinder gets a multi-colored color coating from the plate cylinders. A multicolor color film is thus formed on the rubber cylinder, which is transferred from the embossing plates.

U.S. Pat. No. 3,390,631 discloses so-called cut, elastic template rollers.

DE-PS 888 247 and CH-PS 502 897 disclose the printing of multicolored patterns on letterpress plates using rubber cylinders. It requires one letterpress plate for each color to be printed. Each color must match every other color, which is why each letterpress plate must be precisely aligned with each other plate.

The object of the invention is to provide a printing device for aggregate frame printing in offset printing which is suitable for printing one or more lines in a multicolored security substrate for securities, whereby the lines to be printed can be * printed in color change without interruption and without displacements.

The task is solved as defined in the characterizing part of claim 1.

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The advantages achieved by the invention are based in particular on the fact that the lines or surfaces as offset assembly frame printing can be printed with uninterrupted color changes and without displacements. No color assembly cylinder is needed to first assemble the colors and then count them on the platen. On the other hand no need for more than one plate cylinder, to press the start-line. This avoids laborious and targeted fitting of individual printing plates. Offset plates can be used to achieve an excellent print. The line width of the printing frame remains unchanged during transfer to the printing carrier. The outlines of the lines and color surfaces are sharply demarcated and have a uniform color coverage. Avoid inevitable messing edges and uneven color coverage of lines or surfaces on a print frame printed on a hard frame in direct letterpress printing. A further advantage is that a frame cylinder can be provided for the rubber cylinder acting as a back pressure cylinder, which carries, for example, several printing plates which are dyed from stencil rolls, so that two-sided printing can be produced simultaneously.

In practice, this means that in the printing device according to the invention only a single offset printing plate is required to achieve a multicolor printing image in the wet offset method. This offset printing plate has a multi-colored pattern and is dyed using stencil rollers. Since the entire multicolor pattern occurs on a single offset printing plate, it is necessary to align the template rollers only so that the coloring parts color in a manner similar to the offset printing plate. In this way, for example, in connection with a multicolored line weight, no undesired gaps or lateral transitions can be formed between the individual, different colored line sections.

In the accompanying drawing, one embodiment of the invention is described, which is explained in more detail below. The drawing shows a schematic side view of a sheet-assembly frame rotary printing machine with a printing device according to the invention in cooperation with another offset printing device.

The printable sheets 2 arrive from the cascade feeder 1 in known manner with transport belts not shown past the stop drum 3, the transfer drum 4 to the not shown but known grips of the rubber cylinder 8 (only when the sheet is the printing carrier).

A rubber cylinder 8, the circumference of which may be coated with one, but also rubber fabrics 19, 21, 22 approximately the length of the printing plate, cooperates with a frame cylinder 23. The circumference of the frame cylinder 23 has a number of offset printing plates 24, 26, 27. Offset printing plates 24, 26 , 27 are dyed with elastic, sectorally cut, template rollers 28, 29, 30, 31 known per se. For offset coloring of the template rollers 28, 29, 30, 31, offset coloring devices 33, 34, 36, 37 are provided, whereby each template roller 28 , 29, 30, 31 are provided with an offset dye device 33, 34, 36, 37 each with wetting devices 5, 6, 7, 10,

By means of the template rollers 28-31, the sector-dyed offset printing plates 24, 26, 27 transfer their multicolor image to the printing fabrics 22, 21 and 19 of the rubber cylinder 13, the same offset printing material cooperates with the same printing fabric, i.e. the offset printing plate 24 of fset printing plate 26 with printing fabric 21 and of fset printing plate 27 with printing fabric 22. The printable sheet 2 has to be formed by the rubber cylinder 8 and the rubber cylinder 13 at the point of weight. Here, the rubber cylinder 8 and / or 13 transfers its multicolored image to the sheet 2.

The circumferences of the rubber cylinder 8 and the frame cylinder 23 are equal and an integer multiple of the circumference of the template rollers 28, 29, 30, 31. All template rollers 28, 29, 30, 31 have the same circumference.

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The stencil rollers 28, 29, 30 and 31 each receive a monochromatic color coating from their own color application rollers, each cooperating with its own color device 33, 34, 36 and 37. There are three dyeing rollers and one of them is formed as a combined dye and wetting agent application roller and is connected to the wetting device 5, 6, 7 and 10. The template rollers 28, 29, 30 and 31 now sectorically transfer the dye and wetting agent emulsion to offset plates 24, 26 and 27, Sectorally applied color emulsions successively accumulate on offset printing plates.

All cylinders 8, 13, 23, 14, 16, 17, 18, rollers 28, 29, 30, 31, color devices 33, 34, 36, 37 and drums 3, 4 are driven via a common and per se known drive gear from the main motor 32. Humidification devices 5 , 6, 7, 10 are operated in a known manner by a separate electric motor.

The printable printing medium, e.g. sheet 2, can be simultaneously pressed on both sides between the rubber cylinder 8 and the rubber cylinder 13. In this case, the rubber cylinder 13 coated with one or more rubber fabrics 9, 11, 12 can be dyed from the offset printing plates 38, 39, 41, 42 of the offset frame cylinders 14, 16, 17, 18. The offset printing plates 38, 39, 41, 42 is each dyed with a color device 43, 44, ·: 46, 47 arranged thereon. The rubber cylinders 8 and 13 have the same circumference and also the offset frame cylinders 14, 16, 17, 18 with each other. The circumference of the rubber cylinders 8, 13 is an integer multiple of the circumference of the offset frame cylinders 14, 16, 17, 18.

It would also be possible to mirror-view the cylinders 8 and 23 with their template rollers 28, 29, 30, 31 and color devices 33, 34, 36, 37 yet other cylinders 8 and 23 (but without grippers) with template rollers 28, 29, 30, 31 and color devices 33, 34, 36, 37. With this arrangement of cylinders, a printing base, e.g. sheet 2, could be simultaneously pressed on both sides between the rubber cylinders 8, 8.

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The printed sheets 2 are led, for example, via chain receivers to the sheet receiving device. When a paper web is used as the printing medium, the printed paper web is led to a switch, for example, cut into sheets here and delivered to a sheet receiving device.

Claims (5)

1. Collection device for rotary printing machine with collecting pressure for offset printing of securities, characterized in that the device is provided with an offset printing plate (24, 26, 27), coated with molded cylinders (23), which are arranged around the mold cylinder (23), sectional cut rolls (28, 29, 30, 31) cutting the offset printing plates (24, 26, 27), providing a color device (33, 34, 36, 37) for each template roll (28, 29, 30, 31) ), for the molded cylinder (23) colored in sectors, a gun cylinder (8) is provided which transmits the multicolor print images collected on its rubber cloth or rubber cloths (19, 21, 22) on a printing substrate (2). Pressure device according to claim 1, characterized in that it is provided with a counter-pressure cylinder (13) which interacts with the rubber cylinder (8). Pressure device according to claims 1 and 2, characterized in that the counter-pressure cylinder (13) is realized as a rubber cylinder, that this rubber cylinder (13) is provided with a gunmid cloth extending over approximately its entire circumference or with several rubber cloths (9, 11, 12). ), each of which extends over a portion of its circumference. Pressure device according to claims 1-3, characterized in that a plurality of offset pressure cylinders (14, 16, 17, 18) carrying offset printing discs (38, 39, 41, 42) and for the gunini cylinder (13) are provided and with associated color devices (43, 44, 46, 47).