JPH0241412B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a Sammel printing mechanism used in a rotary printing press for printing securities by indirect letterpress printing, which comprises a printing cylinder on which a letterpress is stretched;
It has a number of driven stencil rollers for applying ink to the cutout and letterpress plates arranged in sections around the plate cylinder, and an inking device is assigned to each stencil roller. Regarding formal matters.

Such sammel printing mechanisms for printing securities are used in sheet-fed rotary printing presses as well as web-fed rotary printing presses.

Sammel printing mechanisms used in rotary printing presses for indirect letterpress printing are already known. However, in such a printing mechanism, a large number of plate cylinders for supporting the letterpress are arranged around the blanket cylinder. Each forme cylinder has an inking device assigned to it. The rubber cylinder is coated with multicolored ink from the plate cylinder. In other words, a multicolored ink film is produced on the plate cylinder, which is applied by means of a letterpress.

A so-called cut-out elastic stencil roller is known from US Pat. No. 3,390,631.

It is an object of the present invention to be suitable for printing one or more lines in multiple colors as a background for preventing counterfeiting on securities, in which case the lines to be printed can be shifted without being interrupted during ink changes. An object of the present invention is to provide a printing mechanism for indirect printing using a relief plate, which allows printing without being affected.

According to the present invention, the problem is solved by the fact that a blanket cylinder is attached to the plate cylinder to which ink is applied for each section, and an impression cylinder is assigned to the blanket cylinder, and the blanket cylinder is attached to one or more rubber blanks of the blanket cylinder. The problem was solved by transferring the multicolored printed image collected on the bucket to the printing substrate.

The advantage provided by the invention is, in particular, that lines or areas can be printed in indirect letterpress printing without any deviations due to continuous ink changes. Furthermore, there is no need to provide an ink collection cylinder that first collects the ink and then delivers it to the printing plate. Furthermore, in order to be able to print linear strips, a large number of plate cylinders are no longer necessary. This avoids the registration of the individual printing plates with respect to each other and the complicated coordination of operations. Furthermore, letterpress printing plates can be used which produce printed images comparable in quality to dry offset printing. Furthermore, the line width of the lines on the printing plate remains approximately the same when transferred to the printing substrate. The lines and inked surface contours are sharply formed and uniformly inked. Blurring of lines or edges and uneven ink application, which are inevitable when letterpress printing is carried out directly on the substrate to be printed with a hard printing plate, are avoided. Furthermore, it is advantageous to be able to allocate a printing form cylinder to the blanket cylinder which acts as an impression cylinder, which printing form cylinder has a number of printing plates that are inked, for example by means of a stencil roller, so that the printing form cylinder can be inked at the same time. Double-sided printing is possible.

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

The sheets 2 to be printed are transferred from a feed tray 1, which holds the sheets in a stacked manner, to a stop drum 3 and a transport drum 4 by means of a conveyor belt (not shown) in a known manner. Although not shown in the drawings, it is connected to a gripper of a known blanket cylinder 8 (only if sheets of paper are used as printing material).

A printing form cylinder 23 cooperates with a blanket cylinder 8 on the circumference of which a rubber blanket 19, 21, 22 of approximately the length of the printing plate can be stretched. The plate cylinder 23 has one or more relief plates 2 around its circumferential surface.
4, 26, and 27. Letterpress 24, 26,
27 is inked by means of known stencil rollers 28, 29, 30, 31 cut out in elastic sections. stencil roller 28,
Inking devices 33, 34, 36, 37 are provided for applying ink to the respective stencil rollers 29, 30, 31.
8, 29, 30, 31, inking devices 33, 34,
36 and 37 are assigned. The circumferential surfaces of the blanket cylinder 8 and the plate cylinder 23 are of the same size and are integral multiples of the circumferential surfaces of the stencil rollers 28, 29, 30, 31. Stencil rollers 28, 29, 30, 31
all have circumferential surfaces of the same size.

Rubber cylinders 8, 13, plate cylinder 23, and offset plate cylinder 1
4, 16, 17, 18 and stencil roller 28,
29, 30, 31 and inking devices 33, 34, 3
6, 37, the stop drum 3 and the transfer drum 4 are driven by the main motor 32 via a common transmission gear, which is known per se.

The material to be printed, for example the sheet 2, is compressed between the blanket cylinders 8 and 13 and printed simultaneously on both sides. In this case, the blanket cylinder 13, on which the rubber blanket or blankets 9, 11, 12 are stretched, is the offset plate cylinder 14, 16, 1.
7, 18 offset plates 38, 39, 41, 4
Ink is applied by 2. The offset printing plates 38, 39, 41, 42 are inked by inking devices 43, 44, 46, 47 assigned to the offset printing plates 38, 39, 41, 42, respectively. The blanket cylinders 8, 13 have the same size circumferential surface, and the offset plate cylinders 14, 16, 17, 18
Similarly, both have circumferential surfaces of the same size.
The peripheral surfaces of the blanket cylinders 8 and 13 are offset plate cylinders 14 and 1.
It is an integral multiple of the circumference of 6, 17, and 18.

During printing, stencil rollers 28, 29, 30,
31 are relief plates 2 of the plate cylinder 23 each having a printed image;
Apply ink in multiple colors to 4, 26, and 27. The multicolored printing image is transferred from the letterpress on the plate cylinder to the rubber blankets 19, 21, 22 on the blanket cylinder 8 and from there is colored in the printing gap between the blanket cylinders 8 and 13 onto the sheet to be printed. . At the same time, the sheet is reverse printed and in the same printing gap is colored with a multicolored printed image from the rubber blankets 9, 11, 12 of the blanket cylinder 13, which transfers the multicolored printed image to the offset plate cylinder 14, 16, 17, 18 offset plate 38,
Collect from 39, 41, 42.

Further, stencil rollers 28, 29, 30, 31 and inking device 33 are mirror-symmetrically arranged with respect to plate cylinder 23 and blanket cylinder 8, which have stencil rollers 28, 29, 30, 31 and inking devices 33, 34, 36, 37. , 34, 36, 37
3 and a rubber cylinder 8 (without gripping nail color) can also be arranged. With this arrangement of plate cylinders and blanket cylinders, the printing material, for example sheet 2, is simultaneously printed on both sides between the blanket cylinders 8.

[Brief explanation of drawings]

The drawing shows a schematic side view of a sheet-fed rotary printing press with a Sammel printing mechanism according to the invention cooperating with an offset printing mechanism. 1...Paper feed tray, 2...Sheet paper, 3...Stop drum, 4...Transfer drum, 8, 13...Rubber cylinder, 9, 11, 12, 19, 21, 22...Rubber blanket, 14, 16, 17, 18...offset plate cylinder, 23... plate cylinder, 24, 26, 27...
... Letterpress, 28, 29, 30, 31 ... Stencil roller, 32 ... Main motor, 33, 34, 3
6, 37, 43, 44, 46, 47... Inking device, 38, 39, 41, 42... Offset printing plate.

Claims (1)

[Scope of Claims] 1. A Sammel printing machine used in a rotary printing press for printing securities by indirect letterpress printing, comprising a plate cylinder covered with letterpress and the surroundings of the plate cylinder. It has a large number of driven stencil rollers that apply ink to the letterpress cut out for each section arranged in a section, and an inking device is assigned to each stencil roller. A blanket cylinder 8 is assigned to the plate cylinder 23 to which ink is applied, and an impression cylinder is assigned to the blanket cylinder.
characterized in that the blanket cylinder 8 is adapted to transfer onto the printing substrate 2 a multicolored printed image collected on one or more rubber blankets 19, 21, 22 of the blanket cylinder, Sammel printing machine used in rotary printing presses. 2. The Sammel printing press according to claim 1, wherein the blanket cylinder 13 cooperating with the blanket cylinder 8 is provided as an impression cylinder. 3. The impression cylinder is configured as a blanket cylinder 13, and the blanket cylinder 13 is a rubber blanket extending over almost the entire circumference of the blanket cylinder 13, or a large number of rubber blankets 9 each extending over a part of the circumference. ,1
1 and 12. The Sammel printing machine according to claim 2, comprising: 4 Inking devices 43, 44, belonging to the rubber cylinder 13,
Offset printing plate 38,3 having 46,47
4. The Sammel printing press according to claim 1, further comprising a plurality of offset plate cylinders 14, 16, 17, 18 supporting offset plate cylinders 9, 41, 42. 5 A second blanket cylinder 8 is assigned to the blanket cylinder 8, and a letterpress 24, which further cooperates with the second blanket cylinder 8,
A second plate cylinder 23 to which ink is applied is provided for each section in which the letterpress plates 26 and 27 are stretched.
4, 26, 27 are applied with ink by elastic stencil rollers 28, 29, 30, 31 cut out for each section. A Sammel printing press according to claim 1, in which inking devices 33, 34, 36, 37 are assigned.