DE102012103715A1 - Rotary printing machine has cleaning device assigned to guide roller arranged between last printing position and drying device, so as to remove printing ink accumulated on guide roller - Google Patents

Abstract

The machine has printing unit (10) containing printing elements (12,13) each of which is provided with mold cylinder (14) and transfer cylinder (15). A guide roller (18) is arranged between the last printing position (16) and drying device (17), is configured to deflect the printed printing material (11) between the printing unit and the drying device. A cleaning device (19) is assigned to guide roller, so as to remove the printing ink accumulated on the guide roller. An independent claim is included for method for operating rotary printing machine.

Description

The invention relates to a web-fed printing press according to the preamble of claim 1. Furthermore, the invention relates to a method for operating a web-fed printing press.

From the practice known web presses for printing a web-shaped substrate typically have multiple printing units to print the web-shaped substrate on both sides. Such printing units have a plurality of printing units, wherein each printing unit comprises at least one inking unit, a forme cylinder and a transfer cylinder. The forme cylinder is often referred to as a plate cylinder and the transfer cylinder often called a rubber cylinder. In addition to the inking unit, each printing unit can also have a dampening unit. In order to dry the or each printed in the web printing machine web-like substrate, are known in practice web presses, in which viewed in the transport direction of the respective printed substrate downstream of the or each printing unit, a drying device is arranged. Such drying devices can be designed as so-called heatset dryers and are used to dry the printed, web-shaped substrate. In the case of web-fed printing presses known from practice, at least one deflecting roller is arranged between a last printing location of the last printing unit and the respective drying device in order to deflect the printed printing material web between the respective last printing location and the respective drying device, for example from one vertical web guide within the respective printing unit in a horizontal web guide in the respective drying device.

In the printing operation, ink can accumulate on the or each guide roller, which is positioned between the respective last printing location of the respective printed substrate web and the respective drying device, whereby these on the respective guide roller accumulating printing ink can affect the print quality and can lead to the printing of waste.

On this basis, the present invention has the object to provide a novel web printing press and a method for operating the same.

This object is achieved by a web-fed printing press according to claim 1. According to the invention, the or each deflecting roller is associated with a cleaning device which, in the printing operation, is permanently attached to the respective deflecting roller in order to permanently remove it from the same on the same accumulating printing ink.

With the present invention, it is proposed that permanent ink be removed from the or each diverter roller during printing operation via the or each diverter so as to permanently free the or each diverter roller of ink which may accumulate thereon. As a result, a high quality printed product can be produced.

The method for operating a web-fed printing press is defined in claim 5.

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:

1 : a highly schematic section of a web-fed printing press according to the invention.

The present invention relates to a web-fed printing press, preferably a web-fed printing press designed as a newspaper printing machine.

1 shows a highly schematic section of a web-fed printing press according to the invention in the region of a printing unit 10 for printing a web-shaped substrate 11 , where in 1 from the printing unit 10 two printing units 12 and 13 are shown, each having a forme cylinder 14 and a transfer cylinder 15 exhibit.

The form cylinder 14 the printing works 12 and 13 are also called plate cylinder and the transfer cylinder 15 the printing works 12 and 13 Also referred to as rubber cylinder.

Although not shown, each printing unit has 12 and 13 continue over an inking unit, using its ink on the or each on the forme cylinder 14 positioned printing form can be applied. In addition, every printing unit 12 and 13 Also include a dampening unit, in addition to the ink fountain solution to the or each on the forme cylinder 14 Apply positioned printing form.

In 1 Roll the two transfer cylinders 15 the two printing units 12 and 13 the printing unit 10 under formation of a pressure nip 16 and thus a pressure point for the substrate to be printed 11 from.

At the in 1 shown printing unit 10 These are the transport direction of the printed substrate 11 seen last printing unit 10 , wherein this printing unit 10 a drying device 17 is downstream, which can be designed as a heatset dryer.

The drying device 17 serves to dry the printed substrate, according to 1 between the last pressure point 16 and the drying device 17 a guide roller 18 is positioned, the deflection of the printed substrate 11 between the printing unit 10 and the drying device 17 serves.

According to 1 indicates the printed substrate web 11 in the area of the printing unit 10 a vertical web guide and in the drying device 17 a horizontal web guide, which is why the printed substrate web in the region of the guide roller 18 is deflected by 90 °.

It should be noted at this point that between the last pressure point 16 the printing unit 10 and the drying device 17 also several guide rollers 18 for deflecting the printed substrate web 11 can be present. It should also be noted that the web running direction of the printed substrate web 11 in the drying device 17 can also run vertically.

According to 1 is the guide roller 18 that appear between the last bruise 16 and the drying device 17 is arranged and the deflection of the printed substrate web 11 serves, a cleaning device 19 assigned, the cleaning device 19 in printing operation permanently to the respective guide roller 18 is set to permanently absorb or decrease from the same in the printing operation on the same accumulating ink.

This ensures that before the guide roller 18 that appear between the last bruise 16 and the drying device 17 is arranged again in contact with the printed substrate web 11 cleaned, the surface of which is cleaned, so that a high-quality printed product can be provided.

In the 1 shown cleaning device 19 has a respective deflection roller in printing operation 18 permanently contacting cleaning agent 20 , this cleaning agent 20 in the printing operation permanently from the guide roller 18 that appear between the last bruise 16 and the drying device 17 is arranged, ink decreases.

For this cleaning agent 20 , which in printing operation permanently the surface of the guide roller 18 contacted, it may be, for example, a cleaning roller or a cleaning cloth or a cleaning blade.

It can be provided that the cleaning device 19 from the guide roller 18 , which typically has a paint repellent surface, can be turned off to subject it to maintenance, for example, upon interruption of the printing operation. According to the invention, however, it is provided that in the printing operation, the cleaning device 19 permanently to the respective guide roller 18 that appear between the last bruise 16 and the drying device 17 is arranged and the deflection of the printed substrate web 11 Serves, is employed by the same in the printing operation permanent printing ink, which is located on the respective guide roller 18 can collect, record.

LIST OF REFERENCE NUMBERS

10

 printing unit

11

 substrate

12

 printing unit

13

 printing unit

14

 form cylinder

15

 transfer cylinder

16

 Nip / print location

17

 drying device

18

 deflecting

19

 cleaning device

20

 cleaning supplies

Claims (5)

Web-fed printing machine, with at least one printing unit ( 10 ) for printing on at least one web-shaped printing substrate, and with at least one in the transport direction of the respective printed substrate as seen in the or each printing unit ( 10 ) downstream drying device ( 17 ), wherein the or each printing unit ( 10 ) at least one printing unit ( 12 . 13 ) with a forme cylinder ( 14 ) and a transfer cylinder ( 15 ), and wherein between a seen in the transport direction of the respective printed substrate last printing point ( 16 ) of the or each printing unit ( 10 ) and the drying device ( 17 ) at least one guide roller ( 18 ) is arranged to the printed substrate web between the last printing location ( 16 ) and the drying device ( 17 ) deflect, characterized in that the or each deflection roller ( 18 ) a cleaning device ( 19 ), which in the printing operation permanently to the respective guide roller ( 18 ) is adjusted to move from the or each guide roller ( 18 ) to permanently remove on the same accumulating ink. Web-fed printing machine according to claim 1, characterized in that the respective cleaning device ( 19 ) in the printing operation, the respective guide roller ( 18 ) permanently contacting cleaning agent ( 20 ) to move from the guide roller ( 18 ) permanently remove printing ink during printing operation. Web-fed printing machine according to claim 2, characterized in that the cleaning agent ( 20 ) formed as a cleaning roller or cleaning cloth or cleaning blade. Web-fed printing machine according to one of claims 1 to 3, characterized in that the respective cleaning device ( 19 ) of guide roller ( 18 ) is shut off. A method for operating a web-fed printing machine, wherein a printing material to be printed is printed, wherein the printed substrate is dried, and wherein the printed substrate is deflected between the printing and drying over at least one guide roller, characterized in that in the printing operation of the or each guide roller is permanently removed on the same accumulating ink.

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