EP1916108A2 - Printing plate and rubber blanket plate for a printing press - Google Patents

Abstract

The plate (10) has a plate-like base body (11). The printing plate has a forward-moving end and a trailing end provided after a cylinder of a printing machine. The ends are bent symmetrically with respect to side of the base body and include two identical angles. The forward moving end (12) and the trailing end (13) are arranged with the side of the base at an angle between 85 and 90deg. The forward moving end and the trailing end is arranged with the side of the base at angle of about 87deg. The forward moving end and trailing end are approximately the same lengths of between 3 and 12 mm. An independent claim is included for a rubber plate.

Description

The invention relates to a printing plate for a printing press according to the preamble of claim 1. Furthermore, the invention relates to a blanket plate for a printing press according to the preamble of claim 9.

Printing units of printing presses have a forme cylinder and a transfer cylinder, wherein on a forme cylinder at least one printing forme and on a transfer cylinder at least one transfer mold is arranged. Printing plates are usually designed as printing plates and transfer forms as blanket plates, which is why a forme cylinder is also referred to as a plate cylinder and a transfer cylinder as a rubber cylinder. Printing plates and blanket plates are mounted or clamped on the respective cylinder of a printing unit of a printing press, for which purpose the printing plates and blanket plates have the same angled leading and trailing ends with respect to a plate-shaped base body. Should z. B. a pressure plate are clamped on a forme cylinder, the leading end and the trailing end of the pressure plate are introduced into at least one clamping channel of the forme cylinder and clamped in the respective clamping channel via a clamping device integrated in the same.

From the US 4,727,807 It is already known to automatically change printing plates on a forme cylinder of a printing press, wherein the printing plates used in this prior art are designed such that the leading end and the trailing end of a printing plate are symmetrically angled relative to the plate-shaped base body, so that the leading end and the trailing end with an approximately equal angle to one side of the body.

In this case, the leading end and the trailing end are angled such that they include a relatively acute angle of less than 45 ° with the main body. At such an acute angle there is the danger that when a tensioned pressure plate to be changed and this with the leading end and the trailing end cooperating clamping devices are released, block the leading end and the trailing end in the clamping channel and then manually must be removed from the same. This affects an automated change of the printing plate and must be avoided. The same problem occurs even when blanket plates are to be changed automatically.

On this basis, the present invention is based on the problem to provide a novel printing plate and a novel blanket plate for a printing press.

This problem is solved by a pressure plate according to claim 1. According to the invention, the leading end and the trailing end each include an angle between 85 ° and 90 ° with the side of the main body.

According to the invention, both the leading end and the trailing end with one side of the basic body include a defined angle between 85 ° and 90 °. This avoids that the leading end and the trailing end block in the chip channel during automated plate change. Rather, jump at such an angle, the leading end and the trailing end of a pressure plate from the respective clamping channel independently, so that no manual intervention to release the leading end and trailing end from the corresponding clamping channel is required.

Preferably, the leading and the trailing end in approximately identical leg lengths, namely leg lengths between 3 mm and 12 mm.

The blanket plate according to the invention is defined in independent claim 9.

Fig. 1:

eine schematisierte Ansicht einer erfindungsgemäßen Druckplatte;

Fig. 2:

eine schematisierte Ansicht einer Druckeinheit einer Rollenrotationsdruckmaschine zusammen mit erfindungsgemäßen Druckplatten;

Fig. 3:

eine schematisierte Ansicht einer weiteren Druckeinheit einer Rollenrotationsdruckmaschine zusammen mit erfindungsgemäßen Druckplatten.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

Fig. 1:

a schematic view of a printing plate according to the invention;

Fig. 2:

a schematic view of a printing unit of a web-fed rotary printing press together with printing plates according to the invention;

3:

a schematic view of another printing unit of a web-fed rotary printing machine together with printing plates according to the invention.

Fig. 1 shows a highly schematic of a printing plate 10 according to the invention, wherein the pressure plate 10 has a plate-like base body 11 which serves as a subject carrier or print image carrier. At opposite ends of the pressure plate 10 has over the base body 11 angled portions, namely a so-called leading end 12 and a so-called trailing end 13. About the leading end 12 and the trailing end 13, the pressure plate 10 can be clamped or placed on a form cylinder, for this purpose the forme cylinder comprises at least one clamping channel with a clamping device integrated in the respective clamping channel.

According to FIG. 1, the leading end 12 and the trailing end 13 are angled symmetrically with respect to the main body 11, in such a way that the leading end 12 and the trailing end 13 enclose an approximately identical angle α with one side of the main body 11. The angle α is between 85 ° and 90 °. Preferably, the angle α is about 87 °.

In such an angled leading end 12 and trailing end 13 ensures that when a tensioned on a forme cylinder pressure plate 10 is released, the leading end 12 and the trailing end 13 each automatically jump out of a clamping channel of the forme cylinder and do not block in the same.

Preferably, the leading end 12 and the trailing end 13 have approximately identical leg lengths. The leg length of the leading end 12 and trailing end 13 is in a range between 3 mm and 12 mm. Such leg length favors the automatic jumping out of leading end 12 and trailing end 13 of a clamping channel when releasing a tensioned on a forme cylinder pressure plate.

The details of a printing plate described above are analogously transferable to a blanket plate, but a blanket plate is not clamped on a forme cylinder of a printing unit but rather on a transfer cylinder of a printing unit. In this context, it should be noted that a blanket plate bears no printed image, but rather transfers depending on the subject on the printing plate applied ink on a printing substrate to be printed.

A printing plate according to the invention and a blanket plate according to the invention can extend over the entire axial width of a corresponding cylinder, in which case the printing plate width or blanket plate width corresponds to the usable axial extent of the respective cylinder.

Alternatively, a plurality of pressure plates or blanket plates can also be stretched axially next to each other on a cylinder, in which case the printing plate width or blanket plate width corresponds to an integer divisor of the usable width of the respective cylinder.

Likewise, a printing plate height or blanket plate height corresponding to the circumference of the respective cylinder or an integer divider of the circumference of the respective cylinder, depending on whether viewed in the circumferential direction of the cylinder exclusively a pressure plate or blanket plate or more printing plates or blanket plates in a row on the same to be stretched.

In a printing plate, the leading end 12 and the trailing end 13 are preferably marked with at least one mark, in such a way that the leading end and the trailing end are identifiable to avoid misplacing or clamping the printing plate on a forme cylinder.

In this case, the or each mark may be formed as a punching or deformation, which cooperates with a corresponding contouring of the respective cylinder or an automated plate changing device and prevents swapping of leading and trailing ends when clamping the pressure plate on the cylinder.

About the or each formed as a punching or deformation mark can also be ensured that the printing form is registering clamped or placed on the forme cylinder.

Alternatively, the or each mark can also be formed as by exposure or by printing applied coding, wherein it is in the coding z. B. may be a text, an icon or a barcode. A cylinder or an automated printing plate changing device can then be associated with a reading device, by means of which the coding can be read from the printing plate, so as to prevent interchanging of the leading and trailing ends when clamping a printing plate on a cylinder.

As a further alternative, the or each mark can also be designed as contactlessly readable RFID tag, wherein then the cylinder or the plate changing device is associated with a reading device for reading the RFID tag.

2 and 3 each schematically show a printing unit 14 or 15 of a web-fed rotary printing press with four printing units 16, each printing unit having a forme cylinder 17 and a transfer cylinder 18 having. In Fig. 2, the printing unit 14 is designed as a so-called 8-cylinder printing unit, in which transfer cylinder 18 adjacent printing units 16 roll on each other and define a printing nip through which a printing substrate 19 is moved therethrough. In Fig. 3, however, the printing unit 15 is designed as a so-called 9-cylinder printing unit, in which all transfer cylinders 18 roll on a satellite cylinder 20 and form with the same pressure column, through which the printing substrate 19 is moved therethrough.

When using pressure plates 10 with symmetrically angled leading ends and trailing ends, it is possible to clamp either the leading end or the trailing end first in a clamping channel, so that a direction of rotation of the cylinder during clamping and removal of a printing plate can be optimally selected.

Furthermore, all printing plates 10 can be supplied to the respective forme cylinder 17 in the horizontal feed direction. Without the risk of a geometrical collision with cylinders of other printing units 16 so-called panoramic printing plates can be stretched in the area of the printing units shown on the right side in FIGS. 2 and 3, which differ from the printing plates shown on the left side of FIGS 10 extend over the entire circumference of a corresponding forme cylinder 17.

LIST OF REFERENCE NUMBERS

10

printing plate

11

body

12

leading end

13

trailing

14

printing unit

15

printing unit

16

printing unit

17

form cylinder

18

transfer cylinder

19

substrate

20

satellite cylinder

Claims (12)

Printing plate for a printing press, in particular for a web-fed rotary printing press, with a plate-like, serving as a sujet carrier body, with an opposite the main body angled leading end and an opposite the main body angled trailing end, the pressure plate over the leading end and trailing end on a forme cylinder of a printing machine tensioned or can be placed, and wherein the leading end and the trailing end are angled relative to the base body so symmetrically that the leading end and the trailing end with one side of the body include an approximately identical angle, characterized in that the leading end (12) and the trailing end (13) with the side of the main body (11) each enclose an angle between 85 ° and 90 °. Pressure plate according to claim 1, characterized in that the leading end (12) and the trailing end (13) with the side of the base body (13) each enclose an angle of approximately 87 °. Printing plate according to claim 1 or 2, characterized in that the leading end (12) and the trailing end (13) have approximately identical leg lengths. Printing plate according to one or more of claims 1 to 3, characterized in that the leading end (12) and the trailing end (13) each have a leg length between 3 mm and 12 mm. Printing plate according to one or more of claims 1 to 4, characterized in that the leading end (12) and the trailing end (13) are each marked with at least one mark such that they are identifiable to avoid misplacement on the forme cylinder. Printing plate according to claim 5, characterized in that the or each mark is formed as a Austanzung or deformation. Printing plate according to claim 5, characterized in that the or each mark is formed as a printed or exposed coding, in particular as a barcode. Printing plate according to claim 5, characterized in that the or each mark is formed as an RFID tag. Blanket plate for a printing press, in particular for a Rollenrotatiorisdruckmaschine, with a plate-like body, with a relative to the main body angled leading end and with respect to the main body angled trailing end, the blanket plate over the leading end and the trailing end on a transfer cylinder of a printing machine can be clamped or placed , and wherein the leading end and the trailing end are angled relative to the base body so symmetrically that the leading end and the trailing end with one side of the base body include an approximately identical angle, characterized in that the leading end and the trailing end with the side of the base body one Include angles between 85 ° and 90 °. Blanket plate according to claim 9, characterized in that the leading end and the trailing end with the side of the base body in each case enclose an angle of approximately 87 °. Blanket plate according to claim 9 or 10, characterized in that the leading end and the trailing end have approximately identical leg lengths. Blanket plate according to one or more of claims 9 to 11, characterized in that the leading end and the trailing end each have a leg length between 3 mm and 12 mm.

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