JPH0241414B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing mechanism for Sammel printing in a rotary printing press for printing securities by offset printing.

BACKGROUND OF THE INVENTION Sammel printing mechanisms of rotary printing presses for indirect letterpress printing are already known. However, in this type of printing mechanism, a number of plate cylinders that hold relief surfaces are arranged around one blanket cylinder. An inking device is associated with each of these plate cylinders. The blanket cylinders receive multicolored ink applications from these plate cylinders. In short, a multicolored ink film is formed on the rubber cylinder from the letterpress side.

From US Pat. No. 3,390,631 a color separation roller with a partially convex inking surface is known.

[Problems to be Solved by the Invention] The problem to be solved by the present invention is to provide a printing mechanism for offset printing in which one or more lines are printed in multiple colors as a background pattern to prevent forgery on securities. The object of the present invention is to ensure that each line to be printed is printed without interruption or deviation in the color change portion.

[Means for Solving the Problem] The present invention has solved this problem as follows.
That is, a plate cylinder covered with an offset printing plate is provided, and a number of cylinders are arranged around and driven around this plate cylinder and ink the offset printing plate by means of partially convex inking printing plates. A color separation plate roller is provided, and each color separation plate roller has one
An inking device is attached to the partially inked plate cylinder, and a blanket cylinder is attached to the blanket cylinder, which blanket cylinder is associated with a counterimpression cylinder, and the blanket cylinder is attached to the plate cylinder, which is partially inked. The multicolored print image collected on the rubber blanket or blankets is adapted to be transferred to the print carrier.

The advantage of this configuration of the present invention is that it is possible to perform Zammel printing using offset printing without discontinuing a plurality of lines or planes at color change areas and without any deviations. In this case, there is no need to arrange an ink collection cylinder that first collects each ink and then transfers it onto the printing plate. Further, there is no need to provide a large number of plate cylinders for printing the background pattern. This also eliminates the need for laborious adjustment and registration of the individual printing plates with respect to one another. A good printed image can be obtained using an offset printing plate. Also, the width of the lines on the plate is maintained until they are transferred onto the print carrier. The line and the contour of the colored surface are sharp and have a uniform ink thickness. Furthermore, the occurrence of line or surface edge collapse and non-uniform ink thickness, which are inevitable in letterpress printing directly from a rigid plate onto the printing carrier, is also avoided.

A further advantage is that a second blanket cylinder is used as the counterimpression cylinder to the blanket cylinder, and this blanket cylinder is associated with a forme cylinder having, for example, a plurality of printing plates which are inked by color separation rollers. It is possible. In this case, double-sided printing can be performed simultaneously.

[Example] The invention will now be explained with reference to the illustrated embodiment.

Sheets 2 to be printed are transferred from a paper feed tray 1 to a blanket cylinder 8 via a stopper drum 3 and a transport drum 4 in a known manner using a transport belt (not shown).
(only if sheets of paper are used as print carrier).

A blanket cylinder 8, whose circumferential surface is covered by a plurality of rubber blankets 19, 21, 22 of approximately the length of the printing plate, cooperates with the printing cylinder 23. The plate cylinder 23 carries one or more offset plates 24, 26, 27 on its circumferential surface. The offset plates 24, 26, 27 are applied by known separation plate rollers 28, 29, 30, 31 having elastic, partially convex inking plates. These color separation rollers 28, 29, 30, 31
Inking devices 33, 34,
36, 37 are arranged, in this case an offset inking device 33, 34, 36 with a dampening device 5, 6, 7, 10 in each case for each of the separation rollers 28, 29, 30, 31. , 37 are assigned one each. The circumferences of the blanket cylinder 8 and the plate cylinder 23 are the same, and the color separation plate rollers 28, 29, 3
It is an integral multiple of the circumference of 0.31. Color separation roller 2
8, 29, 30, and 31 all have the same circumferential dimension.

All trunks 8, 13, 23, 14, 16, 17,
18, rollers 28, 29, 30, 31, inking devices 33, 34, 36, 37, and drums 3, 4,
It is driven by a main motor 32 via a common known transmission gear system. dampening device 5, 6,
7 and 10 are each driven in a known manner by separate electric motors.

A print carrier, for example a sheet 2, is pressed between blanket cylinders 8 and 13 and can be printed, for example, simultaneously on both sides. In the example shown,
One or more rubber blankets 9, 11, 12
The rubber cylinder 13 covered with
4, 16, 17, 18 offset plates 38, 3
Receive ink from 9, 41, and 42. The offset printing plates 38, 39, 41, 42 are inked by inking devices 43, 44, 46, 47 assigned respectively. The blanket cylinders 8 and 13 have the same circumference, and the offset plate cylinders 14, 16,
17 and 18 also have the same circumference. The circumference of the blanket cylinders 8, 13 is the same as that of the offset plate cylinders 14, 16, 1.
It is an integral multiple of the circumference of 7 and 18 circles.

Furthermore, a blanket cylinder 8 and color separation rollers 28, 29, 3
0, 31 and inking devices 33, 34, 36, 37
Mirror-symmetrically with respect to the plate cylinder 23 having the plate cylinder 23, there is another set of second rubber cylinders (but without gripping claws).
It is also possible to provide a second forme cylinder with a separation roller and an inking device. With this configuration of individual cylinders, the printing carrier, for example a sheet 2, is printed on both sides between these two blanket cylinders.

The printed sheets 2 are conveyed, for example, via a chained extension of a paper delivery device. If a web is used as the print carrier, this printed web is fed in a known manner, for example to a cross cutter, where it is cut into sheets and piled in a delivery device.

[Brief explanation of drawings]

The drawings illustrate one embodiment of the invention,
1 is a schematic side view of a sheet-fed rotary printing press with a printing mechanism for sammel printing according to the invention in cooperation with a further offset printing mechanism; FIG. 1...Paper feed tray, 2...Sheet paper, 3...Stopper drum, 4...Transfer drum, 5, 6, 7, 10...
...Moistening device, 8,13...Rubber cylinder, 9,11,1
2, 21, 22...Rubber blanket, 14, 1
6, 17, 18...offset plate cylinder, 23... plate cylinder, 24, 26, 27, 38, 39, 41, 42
...Offset plate, 28, 29, 30, 31...
...Color separation roller, 32...Main motor, 3
3, 34, 36, 37, 43, 44, 46, 47
...Inking device.

Claims (1)

[Scope of Claims] 1. In a printing mechanism for Sammel printing in a rotary printing press for printing securities by offset printing, one plate cylinder 23 covered with offset plate surfaces 24, 26, 27 is arranged. , this plate cylinder 23
The offset printing plates 24, 26,
A plurality of color separation rollers 2 that apply ink to 27
8, 29, 30, 31, one inking device is assigned to each color separation plate roller 28, 29, 30, 31, and one blanket cylinder 8 is assigned to the plate cylinder 23. A counter-impression cylinder is attached to this blanket cylinder 8, and the blanket cylinder 8 transfers the multicolored print image collected on one or more rubber blankets 19, 21, 22 onto the printing carrier 2. A printing mechanism for sammel printing in a rotary printing press for printing securities, characterized in that it is adapted to transmit information. 2. Printing mechanism for Sammel printing in a rotary printing press according to claim 1, in which a counter impression cylinder 13 cooperating with the blanket cylinder 8 is provided. 3. The opposing impression cylinder is constructed as a blanket cylinder 13, which is provided with either one rubber blanket extending over almost the entire circumference or a plurality of rubber blankets each extending over a portion of the circumference. A printing mechanism for sammel printing in a rotary printing press according to claim 2, wherein the butts 19, 21, and 22 are stretched. 4 Holds the offset plate surfaces 38, 39, 41, 42 and attached inking devices 43, 44, 46, 4
A plurality of offset plate cylinders 14, 16, 1 with 7
A printing mechanism for sammel printing in a rotary printing press according to claim 3, wherein 7 and 18 are assigned to the blanket cylinder 13 as opposing impression cylinders. 5 A second rubber cylinder is assigned to the rubber cylinder 8,
A second plate cylinder covered with an offset printing plate is arranged to cooperate with this second blanket cylinder, and an elastic color separation printing plate with a locally convex inked printing plate is arranged on the offset printing plate. For Sammel printing in a rotary printing press according to claim 1, in which inking is carried out by rollers, and each color separation roller is assigned one inking device and one dampening device. Printing mechanism.