DD285877A7 - PRINTING PRESS - Google Patents

Abstract

The invention relates to a printing press, in particular for multicolor printing. Based on the task - creating a printing press according to the image transport principle, which has a small number of color gaps and can be equipped with a variety of printing - is at a printing press with a Bedruckstoffzufuehrung, a Bedruckstofftransportsystem and Bedruckstoffabfuehrung at least one printing forme cylinder with inking and dampening and The printing substrate transport system is designed as a central impression cylinder cooperating with the printing material removal and the printing material supply, each impression cylinder assigned an impression cylinder and the Druckbilduebertragungselement as endless, standing in touch contact with the central pressure cylinder and through the pressure zone between at least one printing form cylinder and at least one impression cylinder guided bandfoermiges print image is formed collecting element. Image Transport principle; Central impression cylinder; Print image collecting element}

Description

For this 5 pages drawings

Anwendungcgeblet

The invention relates to a printing press, in particular for multi-color printing.

Characteristic of known technical soundings

It is a sheet-fed printing machine known (DE 3203948), in which the blanket cylinders of the individual printing units are arranged in contact for color transmission in series and a cylinder, which simultaneously represents the application drum and the Umlefiksystem the Auslagekettenkreises, is pressed against a blanket cylinder. The disadvantage here is that many color gaps are necessary for image transfer printing, which cause an increase in dot, Doubliererscheinungen and thus a loss of quality. Furthermore, in these machines due to the above-average number of cleavage sites, a color layer thickness control according to the different length path of the color to color transfer to the substrate problematic. This machine design is not suitable for modern machine with a large number of printing units, such as a 10-color machine due to the disadvantages described.

2Ie of the invention

The aim of the invention is to increase the quality of printing, simplify the sheet guiding and, associated therewith, increase the printing capacity.

Essence of invention Aufga je Ei.'indung is the creation of a printing machine according to the image transport principle, which a small number of Has color gaps and can be equipped with a variety of printing works. According to the invention, the object in a printing machine with a printing material, a Beds recycling system and a printing material removal, at least one printing forme cylinder with dyeing and dampening unit

and at least one in contact with the printing material transport system and the printing form cylinder

Printed image transfer element achieved in that the printing material transport system as mi 'the printing material removal and

formed the printing material supply cooperating central pressure cylinder, each printing forme cylinder

Associated impression cylinder and the print image transfer element as an endless, in touching contact with the Central pressure cylinder standing and through the pressure zone between at least one Dnckformzylinder and at least

a counter-pressure / linder guided band-shaped printed image collecting element is formed.

The central pressure cylinder is as a sheet guiding central pressure cylinder with at least one gripper system or as Bahnführungszentraldruckzylinder formed. At least one printing plate cylinder with dyeing and dampening unit is above

des.oberen run of Druckbildsammelelomentes or at least one Druckfoimzylinder below the lower run of the

Printed image collecting element or at least one printing forme cylinder with dyeing and dampening unit above the upper run of the Print image collecting element and at least one printing forme cylinder with dyeing and dampening unit below the lower run of the Printed image collecting element arranged. The Bogenfqhrungszentraldruckzylinder is another printed image collecting element with at least one printing form cylinder

associated with dyeing and dampening unit and a counter-pressure cylinder.

The web guide central pressure cylinder is a printed image collecting element with at least one printing form cylinder with dyeing

and dampening and associated with a counter-pressure cylinder.

The print image collecting element is designed as an endless offset printing blanket or at least one offset blanket piece is fixed with

connected to the print image collecting element or the printed image collecting element has at least one gripping system for a

Offset printing piece on. Ausführungsbelsplel The invention will be explained in more detail using an exemplary embodiment. In the drawings show Fig. 1: sheet-fed printing machine with transfer printing units Flg. 2: sheet-fed printing machine with Untertrum printing units Fig. 3: Sheet-fed printing machine with top and bottom strand printing units Figure 4; Sheet-fed press with double-impression printing units Fig.5: Web-fed printing press (single-printing unit). The printing machine according to the invention in the form of a sheet-fed printing machine consists of a sheet-guiding system

and a print-producing system.

The sheet-guiding system consists (Fig. 1 to 4) of a printing material feed with a feeder 1, a feed table 2 and

a sheet transfer 3, for example, a pre-gripper, one of the sheet transfer downstream as

Bogonführungszentraldruckzylinder 4.1 trained printing material transport system and as a sheet delivery 5

trained printing material removal.

The sheet guide central pressure cylinder 4.1 has two gripper systems 6, wherein the number of gripper systems increases

or can be reduced

The printing machine according to the invention in the embodiment as a web-fed printing press consists of a web-guiding system

and a print-image-carrying system.

The web-guiding system (FIG. 5) consists of a printing material feed with a unwinding 22 and a Bahnzufünrungsrolle 23, a web guide central pressure cylinder 4.2; and one as a reel 24 with Bahnabführungsrollen

25 trained printing material removal.

The printing image leading system consists partly of a printed image collecting element 7, which is endless over two Deflection rollers 8 guided belt is formed and is in contact with the central pressure cylinder 4. On the other hand, the image-carrying system consists of at least one printing unit. The printing unit consists of a Printing form cylinder 9 with inking unit 10 and dampening unit 11, and a counter-pressure cylinder 12. The upper run 13 of the Print image collecting element 7 passes through the contact zone between printing form cylinder 9 and impression cylinder 12

(Fiqi).

At least one drying device 15 acts on the central pressure cylinder 4, and at least one washing device 16 and a slug catcher 17 act on the printed image collecting element.

The printed image collecting Ent 7 is formed as an endless offset blanket 18 (Figure 3) or with the printed image collecting element 7 at least one offset blanket piece 19 is connected, wherein at several associated with the printed image collecting element Offsetdrucktuchernstücken a gap for the gripper system β is provided (Fig. 1).

The printed image collecting element 7 can also consist of at least one offset printing blanket section 21 guided on a leading edge or on a leading edge and trailing edge and / or side edge gripping system 20 (FIG. 2).

In Fig. 2 lit an Aueführungsform shown, wherein the printing units consisting of printing form cylinder 9 with dyeing and dampening unit (10; 11) and impression cylinder 12 with the lower run 14 of the print image collecting moment 7 are in touching contact.

In Fig. 3 is a Aueführungsform is shown, wherein the first number of printing units with the upper run of the

7 in touch contact cteht.

4, a further embodiment is shown, wherein the sheet guiding central pressure cylinder 4.1 is associated with a further printed image collecting element T with the corresponding printing units.

In Figure 5, an embodiment is shown, wherein the web guide central printing cylinder 4.2 is associated with a printed image collecting element 7.

The operation of the printing machine according to the invention will be described below.

The withdrawn from the feeder 1 sheet is fed via the feed table 2 and the sheet transfer 3 to the central pressure cylinder. After printing, the ink applied to the sheet is dried by means of the drier 15 and fed to the delivery stack by means of the sheet delivery 5. The print image collecting element 7 passes through the print zone between Jruckformzylinder 9 and impression cylinder 12 of the first printing unit and takes over the printed image with the first color.

According to the number of printing units, the other colors are applied in the same way. The collective color image is transferred to the sheet as it passes through the printing zone between the central printing cylinder 4 and the printed image collecting element 7.

The advantages of this system are the ease of sheeting and printing with minimal doubling problems with a small number of color gaps.

Claims (10)

1. Printing machine with a printing substrate, a Bedruckstofftransportsystem and a Bedruckstoffabführung at least one printing form cylinder with dyeing and dampening and at least one standing in contact with the printing material transport system and the printing form cylinder Druckbildübertrag'mgselement, characterized in that the Bedruckstofftransportsystem a! * With the printing material removal and the Each printing plate cylinder (9) associated with a counter-pressure cylinder (12) and the print image transfer element as an endless, in contact contact with the central pressure cylinder (4) and standing by the pressure zone between at least one Druckforrnzylinder (9) and at least one Counter-pressure cylinder (12) guided band-shaped printed image collecting element (7) is formed. 2. Printing machine according to claim 1, characterized in that the central pressure cylinder (4) as Bogdnführungszentraldruckzylinder (4.1) with at least one gripper system (6) is formed. 3. Printing machine r, .ch claim 1, characterized in that the central pressure cylinder (4) is designed as a first web guide central pressure cylinder (4.2). 4. Printing machine according to claim 1, characterized in that at least one printing form cylinder (9) with dyeing and dampening unit (10; 11) above the upper run (13) of the printed image collecting element (7) is arranged 5. Printing machine according to claim 1, characterized in that at least one printing form cylinder (9) with dyeing and dampening unit (10; 11) below the lower run (14) dos Druokbildsammelelementes (7) is arranged, 6. Printing machine according to claim 1, characterized in that at least one printing form cylinder (9) with dyeing and dampening unit (10; 11) above the upper run (13) of the printed image collecting element (7) and at least one printing form cylinder (9) with color and Dampening (10; 11) below the lower run (14) of the printed image collecting element (7) is arranged. 7. Printing machine according to claim 2, characterized in that the sheet guiding central pressure cylinder (4.1) a further printed image collecting element (7 ') with at least one printing form cylinder (9') with dyeing and dampening unit (10 ', 1 V) and a counter-pressure cylinder (12') assigned. 8. Printing machine according to claim 1, characterized in that the Druckbildsammslelement (7, 7 ') is formed as an endless offset printing blanket (18). 9. Printing machine according to claim 1, characterized in that at least one offset blanket piece (19) with the printed image collecting element (7, 7 ') is firmly connected. 10. Printing machine according to claim 1, characterized in that the printed image collecting element (7, 7 ') has at least one gripping system (20) for an offset blanket piece (19).