CH655051A5 - COLLECTIVE PRINTING MACHINE PRINTER FOR SECURITIES PRINTING. - Google Patents

Description

The invention relates to a collective printing rotary printing press for security printing in indirect letterpress printing according to the preamble of claim 1. The collective printing rotary printing press for security printing can be used in both sheet-fed and web-fed rotary printing presses.

Group printing rotary printing presses for indirect printing have become known. In machines of this type, however, a plurality of forme cylinders carrying high-pressure plates are arranged around a rubber cylinder. Each plate cylinder has an inking unit assigned to it. The rubber cylinder receives a multi-colored paint application from the plate cylinders. A multicolored color film is created on the rubber cylinder, which is applied by the high-pressure plates.

So-called cut, elastic stencil rollers have become known from US Pat. No. 3,390,631.

The invention has for its object to provide a printing unit for indirect bulk printing of letterpress forms, which is suitable for printing one or more lines in multiple colors as a security background for securities, the lines to be printed can be printed continuously in color change and without offset.

The object is achieved by the subject matter of the characterizing part of claim 1.

The advantages that can be achieved with the invention are, in particular, that lines or areas can be printed in continuous color changes without any offset in indirect high-pressure collective printing. There is no need to arrange an ink collecting cylinder, which first collects the colors and then releases them onto the printing plate. On the other hand, multiple plate cylinders are not required to print a line background. This avoids labor-intensive adjustment and register-based fitting of the individual printing plates to one another. High-pressure plates can be used, with which a print image that is equivalent in quality to dry offset printing can be achieved. The line width of the line on the printing form is approximately preserved when it is transferred to the printing medium. The outer contours of the lines and color areas are sharply delimited and have a uniform color coverage. The squeezing edges and uneven color coverage of the lines or surfaces that are unavoidable in direct high pressure from a hard form on a print carrier to be printed are avoided.

Another advantage is that a plate cylinder can be assigned to the rubber cylinder acting as an impression cylinder, which, for. B. carries several printing plates, which are inked by stencil rollers, so that both face and reverse printing can be generated at the same time.

An embodiment of the invention is shown in the drawing and will be described in more detail below. The figure shows a sheet-fed printing rotary printing machine with a printing unit according to the invention in cooperation with an offset printing unit, in a schematic representation in side view.

From a shed feeder 1, sheets 2 to be printed arrive in a known manner by means of conveyor belts (not shown) via a stop drum 3, a transfer drum 4 into known but not known grippers of a rubber cylinder 8 (only in the case of sheets as print carriers).

A plate cylinder 23 interacts with the rubber cylinder 8, which can be covered on its circumference with a single, but also with rubber blankets 19, 21, 22 that are approximately printing plates. The plate cylinder 23 carries one or more high-pressure plates 24, 26, 27 around its circumference. The high-pressure plates 24, 26, 27 are colored by means of elastic, sectorally cut out stencil rollers 28, 29, 30, 31 known per se. For inking the stencil rollers 28, 29, 30, 31, inking units 33, 34, 36, 37 are provided, each stencil roller 28; 29; 30; 31 an inking unit 33; 34; 36; 37 is assigned. The circumferences of blanket cylinder 8 and plate cylinder 23 are the same and an integral multiple of the circumference of the stencil rollers 28, 29, 30, 31. The stencil rollers 28, 29, 30, 31 all have the same circumference.

All cylinders 8, 13, 23, 14, 16, 17, 18, rollers 28, 29, 30, 31, inking units 33, 34, 36, 37 and drums 3, 4 are driven by a common gear train known per se from a main motor 32 driven.

The print medium to be printed, e.g. Sheet 2, can be pressed between the rubber cylinder 8 and a rubber cylinder 13 z. B. can be printed simultaneously in face and reverse printing. In this case, the blanket cylinder 13, which is covered with one or more blankets 9, 11, 12, can be colored by offset printing plates 38, 39, 41, 42 of the offset plate cylinders 14, 16, 17, 18. The offset printing plates 38, 39, 41, 42 are inked by an inking unit 43, 44, 46, 47 assigned to them.

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Rubber cylinders 8 and 13 have the same circumference, also the offset plate cylinders 14, 16, 17, 18 with one another. The circumference of the rubber cylinders 8, 13 is an integral multiple of the circumference of the offset plate cylinders 14, 16, 17, 18.

It would also be possible to mirror the cylinders 8 and 23 with the template rollers 28, 29, 30, 31 and

655 051

Inking units 33, 34, 36, 37 once again arrange cylinders 8 and 23 (but without a gripper) with stencil rollers 28, 29, 30, 31 and inking units 33, 34, 36, 37. With this arrangement of the cylinders, the printing medium, e.g. B. a sheet 2, between the blanket cylinders 8, 8 are printed simultaneously in face and back printing.

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1 sheet of drawings

Claims (5)

655 051 PATENT CLAIMS 1. Collective printing rotary machine printing unit for security printing in indirect high pressure with a plate cylinder (23) covered with high pressure molds, with a plurality of driven, sectorally cut-out stencil rollers (28-31) arranged around the plate cylinder (23), inking the high pressure molds, each of which is a stencil roller (28-31) is assigned an inking unit (33, 34, 36, 37), characterized in that a rubber cylinder (8) is assigned to the sector-inked plate cylinder (23), which cylinder cylinder (8) , 22) transfers collected multicolored print images onto a print carrier (2). 2. collective printing rotary machine printing unit according to claim 1, characterized in that a counter-pressure cylinder (13) cooperating with the rubber cylinder (8) is provided. 3. collective printing rotary machine printing unit according to claim 1 and 2, characterized in that the impression cylinder (13) is designed as a rubber cylinder (13), that the rubber cylinder (13) with an approximately over the entire circumference of the rubber cylinder (13) extending rubber blanket , or several rubber blankets (9; 11; 12) each extending over part of the circumference. 4. Collective printing rotary machine printing unit according to claim 1 to 3, characterized in that the blanket cylinder (13) a number of offset printing plates (38,39, 41,42) carrying offset plate cylinders (14,16,17,18) with associated inking units (43, 44,46,47) are assigned. 5. collective printing rotary machine printing unit according to claim 1, characterized in that the blanket cylinder (8) is assigned a second blanket cylinder (8), that with the second blanket cylinder (8) cooperating, with high pressure plates (24,26,27) occupied, sectoral colored second plate cylinder (23) is provided, the high-pressure plates (24, 26, 27) being colored by sector-cut, elastic stencil rollers (28, 29, 30, 31), and each stencil roller (28, 29, 30, 31) ) an inking unit (33, 34, 36, 37) is assigned.