EP1867476A1 - Rotary printing press - Google Patents

Abstract

The printing machine has a printing tool with a form cylinder (4), where the form cylinder has a cylinder channel (8) and carries a printing form. An inking unit and a damping unit are attached to the form cylinder. The printing form is colored with the medium in a form of printing color by using an inking roller, and is moistened with the medium in a form of a moist unit by using the inking roller. The cylinder channel is formed by a rubber blanket cylinder (3) of a printing tool (I).

Description

The invention relates to a rotary printing press according to the preamble of claim 1. As rotary printing machines are particularly suitable offset printing machines and / or coating units with at least two printing / coating units for the processing of substrates.

In rotary printing machines, the surface of a fixed on the forme cylinder or plate cylinder printing plate is colored by means of several inking rollers and wetted if necessary in wet offset by at least one dampening roller with fountain solution. In coating plants, the printing forme fixed on the forme cylinder (including a rubber blanket) is wetted with lacquer by means of at least one lacquer applicator roller. Such form cylinder usually have a cylinder channel for the fixation of the printing plate by means of clamping means. When passing through the cylinder channel of the forme cylinder, no ink, dampening solution or paint can be transferred to the printing form from the applicator rollers (ink, damp, lacquer application rollers). It may thus build up an approximately strip-shaped excess of color, dampening solution or paint on the respective applicator roller and lead to over-staining, over-moistening or repainting of a subsequent part of the printing form. Since the sheet material by means of at least one cylinder channel having sheet guiding cylinder (printing cylinder, transfer cylinder) is conveyed in the conveying direction by the sheet-fed rotary printing machine, these effects can overlap as the sheet material passes through several printing / varnishing and thus affect the printing / Lackierqualität by stripes on Imagine the print subject of the sheet material.

A rotary printing press of this kind is out DE 196 34 911 A1 known as an offset printing unit, which comprises a forme cylinder / plate cylinder cylinder with cylinder and each a wet / inking unit. The form cylinder are in the direction of rotation assigned several applicator rollers for the supply of dampening solution and color. The first application roller in the direction of rotation of the forme cylinder serves as a dampening applicator roller and is in direct contact with a dampening drive roller arranged below the dampening applicator roller and with upstream rollers for the dampening solution supply. In the direction of rotation of the forme cylinder, the first applicator roller is followed by at least one second applicator roller as an inking roller, wherein both applicator rollers are supplied with a color flow by an upstream, first inking roller directly in contact therewith. In the direction of rotation of the forme cylinder is followed by the second applicator roller upstream of a bridge roller, which is in direct contact with a downstream in the direction of rotation of the forme cylinder third applicator roll. The third application roller is preceded by a second inking roller, which in turn is in direct contact with a downstream in the direction of rotation of the forme fourth applicator roller. Bridge roller and second inking roller supply the adjacent applicator rollers with a color flow. In this printing unit, the diameters or circumferences of the application rollers are to be determined according to specific geometrical conditions. Thus, the circumference of the dampening form roller should correspond to approximately half the printing length and the diameter of the dampening form roller to the diameter of the forme cylinder should be divisible in the ratio 1: (n + 0.5). The applicator rollers arranged remotely from the dampening roller should have larger diameter deviations from this dampening roller.

Furthermore are out DE 82 04 506 U1 or DE 38 43 473 A1 Solutions known that interrupt the dampening solution supply to the dampening roller when passing the forme cylinder cylinder channel by suitable means or interrupt specifically by using a scraper.

In such rotary printing machines, as is well known, the geometric arrangement of the cylinder channel, the beginning of the printing, the end of the printing of the forme cylinder, the blanket cylinder and the impression cylinder from the printing / coating unit to the printing / coating unit are the same.

The object of the invention is a rotary printing machine of the aforementioned To create a type that compensates in particular the caused by the passage of a cylinder channel of a forme cylinder impairments in print quality.

The problem is solved by the training features of claim 1. Further developments will become apparent from the dependent claims.

A first advantage of the invention is due to the fact that a more uniform roll strip is produced on the print substrate in the printing / coating operation, in that at least one forme cylinder of a printing / coating unit has a special cylinder channel arrangement. This special cylinder channel arrangement also changes the beginning of the print / varnish and the end of the print / varnish on this forme cylinder. In further developments, the invention can also be realized in the cylinder channels of the blanket cylinder and / or the printing material leading printing cylinders.

A second advantage is that compensated by the special cylinder channel arrangement initiated at the roll start on a channel edge shock (channel impact) of the respective applicator roll (inking unit and if necessary dampening unit) and the printing technology disturbances, in particular vibrations in the printing / coating unit or the rotary printing machine reduced. Furthermore, the occurrence of visible streaks in the printed matter is avoided, thus improving the print quality.

Fig. 1

eine Rotationsdruckmaschine mit zwei Druckwerken und einem Lackwerk,

Fig. 2

eine Zylinderkanalanordnung in erster Ausbildung,

Fig. 3

eine Zylinderkanalanordnung in zweiter Ausbildung.

The invention will be explained in more detail using an exemplary embodiment. Here are shown schematically:

Fig. 1

a rotary printing machine with two printing units and a coating unit,

Fig. 2

a cylinder channel arrangement in the first embodiment,

Fig. 3

a cylinder channel arrangement in a second embodiment.

A rotary printing press, for example for the processing of sheet material, comprises at least two printing / coating units I to III. Each printing unit I, II has a cylindrical cylinder 8 having and a printing plate-carrying forme cylinder 4. The forme cylinder 4 is at least one inking unit and if necessary associated with a dampening unit (not shown). In this case, the printing plate is inked by means of applicator rollers, especially inking rollers, with a medium in the form of ink and wetted using a dampening unit by means of at least one applicator roller, especially at least one dampening roller, with a medium in the form of dampening solution. Alternatively, a coating unit III comprises a printing forme (including blanket) carrying the form cylinder 5 (painting cylinder 5) with cylinder channel 8, which is associated with a metering system 6, wherein the printing forme by means of a applicator roll, especially with a screened enamel applicator roller and a chambered doctor blade, with a medium is wetted in the form of paint.

1, a printing unit I, II designed as a plate cylinder form cylinder 4 and a form cylinder 4 adjacent arranged blanket cylinder 3, wherein the blanket cylinder 3 with a printing material in the conveying direction 7 transporting pressure cylinder 1 cooperates. In the present example, the substrate is a sheet material. The form cylinder 5 of the coating unit III is associated with a printing material leading impression cylinder 1. For the transport of the sheet-shaped printing material in the conveying direction 7, at least one transfer cylinder 2 is arranged between the printing cylinders 1. In the present example, the pressure / transfer cylinders 1, 2 - based on a single-size form cylinder 4, 5 - double-sized and have in a conventional manner circumferentially two diametrically arranged cylinder channels 8 for receiving sheet holding means.

The cylinder channel 8 of at least one forme cylinder (plate cylinder 4, painting cylinder 5) of the printing / coating units I, II, III is designed such that a different design of the cylinder channels 8 of the forme cylinder (plate cylinder 4, painting cylinder 5) of a printing / coating unit I, II, III is given to a printing / coating unit I, II, III of the rotary printing press.

Depending on the configuration of the rotary printing machine, the formation of the cylinder channel 8 of the at least one forme cylinder 4, 5 also to a plurality of printing / coating units I - III, especially their forme cylinders 4, 5, have a different design.

In a further embodiment, in addition, the cylinder channel 8 of at least one blanket cylinder 3 of the printing units I, II be designed such that a different design of the cylinder channels 8 of the blanket cylinder 3 of a printing unit I, II to a blanket cylinder 3 of the other printing units I, II Rotary printing machine is given

In a further embodiment, in addition, the cylinder channel 8 of at least one printing cylinder 1 leading to the printing material can be designed such that a different design of the cylinder channels 8 of the printing cylinder 1 from a printing / coating unit I, II, III to a printing cylinder 1 of the other pressure / Lackwerke I, II, III of the rotary printing machine is given.

In a further embodiment, the cylinder channel 8 of at least one forme cylinder 4, 5 (plate cylinder 4, painting cylinder 5) a deviating in the circumferential direction channel width 9 of a printing / coating unit I, II, III to at least one cylinder (plate cylinder 4, painting cylinder 5) have the same position in another printing / coating unit I, II, III of the rotary printing machine.
In a further development, at least one blanket cylinder 3 and / or at least one impression cylinder 1 can have a channel width 9 deviating in the circumferential direction from a printing / coating unit I, II, III to at least one cylinder (blanket cylinder 3, impression cylinder 1) have the same position in another printing / coating unit I, II, III of the rotary printing press.

In a further embodiment, the cylinder channel 8 of at least one forme cylinder (plate cylinder 4, Lackierzylinder 5) in the circumferential direction by an angle α deviating position of a printing / coating unit I, II, III to at least one cylinder (plate cylinder 4, painting cylinder 5) have the same position in another printing / coating unit I, II, III of the rotary printing machine. In a further development, at least one blanket cylinder 3 and / or at least one impression cylinder 1 a circumferentially by an angle α deviating position of a printing / coating unit I, II, III to at least one cylinder (blanket cylinder 3, impression cylinder 1) the same position in another Printing / coating unit I, II, III have the rotary printing press.
In Fig. 3 it can be seen that the angle α between a cylinder channel 8 in a conventional angular position and a staggered by the angle α in the circumferential direction of the cylinder channel 8 'is formed.

In the arrangement of printing units I, II for multi-color printing and / or several coating units III can in the conveying direction 7, for example, every second printing / coating unit I - III with at least one forme cylinder 4, 5 with a different design of the cylinder channels 8 to the forme cylinders 4, 5 of the other printing / coating units I - III be formed. In combination with such deviating formed cylinders 4, 5 blanket cylinder 3 and / or impression cylinder 1 can each be arranged with different design of the cylinder channels 8 in - with respect to such form cylinder 4, 5 - same printing / coating unit I - III.

Furthermore, in addition, for example, in each second printing / coating unit I - III, the blanket cylinder 3 and / or impression cylinder 1 with a different design of the cylinder channels 8 to the blanket cylinders 3 and / or printing cylinders 1 of the other printing / coating units I - III may be formed.

LIST OF REFERENCE NUMBERS

01 -

pressure cylinder

02 -

transfer cylinder

03 -

Blanket cylinder

04 -

Form cylinder (plate cylinder)

05 -

Form cylinder (painting cylinder)

06 -

dosing

07 -

conveying direction

08 -

cylinder gap

09 -

channel width

α -

angle

I -

first printing unit

II -

second printing unit

III -

coating unit

Claims (5)

Rotary printing machine with at least two printing / coating units and each having a cylinder channel, a printing plate-carrying forme cylinder, which is associated with an inking unit and possibly a dampening unit and inked the printing plate by means of application rollers with a medium in the form of ink and optionally by means of at least one applicator roller is wetted with a medium in the form of dampening solution, or one each a cylinder channel having, a printing plate-bearing form cylinder is associated with a coating unit and the printing plate is wetted by means of at least one applicator roller with a medium in the form of paint,
characterized,
in that the cylinder channel (8) of at least one forme cylinder (4, 5) of the pressure / coating units (I, II, III) is designed in such a way that a deviating formation of the cylinder channels (8) of the forme cylinders (4, 5) from a pressure - / Lackwerk (I, II, III) to another printing / coating unit (I, II, III) is given. Rotary printing machine according to claim 1,
characterized,
that the cylinder channel (8) of at least one blanket cylinder (3) of the printing units (I, II) is designed such that a different design of the cylinder channels (8) of the blanket cylinder (3) from a printing unit (I, II) to another printing unit (I, II) is given. Rotary printing machine according to claim 1,
characterized,
in that the cylinder channel (8) is formed by at least one pressure cylinder (1) guiding the printing material in such a way that a deviating formation of the cylinder channels (8) of the printing cylinders (1) from one printing / coating unit (I, II, III) to another Printing / coating unit (I, II, III) is given. Rotary printing machine according to one of claims 1, 2 or 3,
characterized,
that the cylinder channel (8)) of at least one forme cylinder (4, 5) or a blanket cylinder (3) or a pressure cylinder (1) to a circumferentially deviating channel width (9) of a printing / coating unit (I, II, III) at least one cylinder (1, 3, 4, 5) has the same position in another printing / coating unit (I, II, III). Rotary printing machine according to claim 1,
characterized ,
in that the cylinder channel (8)) of at least one forme cylinder (4, 5) or a blanket cylinder (3) or a pressure cylinder (1) has a position deviating in the circumferential direction by an angle (α) from a printing / coating unit (I, II, III) to at least one cylinder (1, 3, 4, 5) has the same position in a further printing / coating unit (I, II, III).

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