DE102006031714B4 - Method for operating a rotary printing press with an imprinting unit for flying plate change - Google Patents

Abstract

A method for operating a rotary printing press (03) with an imprinting unit (04) for on-the-fly plate change, in which the imprinting unit (04) comprises two printing units (05; 06) which can be brought into functional position alternately, with several printing units being used for successive printing by means of the imprinting unit ( 04) partial editions (TA) to be printed during the printing of one printing unit (05 or 06), the other printing unit (06 or 05) that is not in the functional position, a plate change can be carried out, whereby a production speed (U) of the rotary printing press (03) is controlled as a function of a level of the current partial edition (TAakt) currently being printed, the production speed (U) of the rotary printing press (03) being controlled as a function of a total change time (GW) required for the on-the-fly plate change, depending on the current partial edition (TAakt) and the total required for a plate change t changeover time (GW) the current production speed (Uakt) compared to a maximum production speed (Umax) of the rotary printing press (03) is reduced as soon as the amount of the current partial edition (TAakt) is less than a ...

Description

The invention relates to a method for operating a rotary printing press with an imprinting unit for flying plate change.

Rotary printing machines with imprints for flying plate change are for example from the DE 100 08 936 A1 or the DE 93 11 113 U1 known.

In the past, the plate change on imprinters was often still done manually. On the other hand, in the case of the present invention, the plate changing on printing units should be automated.

The DE 2 033 836 A discloses a method of printing a newspaper with multiple partial issues. In this case, the speed of the printing press is reduced during a flying plate change.

The EP 1 287 987 A1 describes a controller for the plate change.

The invention has for its object to provide a method for operating a rotary printing machine with an imprinting unit for flying plate change.

The object is achieved by the features of claim 1.

The achievable with the present invention consist in particular in that the continuous printing speed of the rotary printing machine to the respective print job is automatically adjustable.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Show it:

1 a schematic side partial view of a rotary printing machine with an imprinting unit for flying plate change;

2 a machine layout for a newspaper press;

3 a section of a newspaper printing press with a ten-tower.

1 shows a schematic section through three of a web 02 , z. B. web 02 or substrate web 02 , especially paper web 02 consecutively passed printing units 05 ; 06 ; 07 , z. B. printing units 05 ; 06 ; 07 for perfecting, especially offset printing 05 for perfecting, a rotary printing machine 03 , in particular a web-fed rotary offset printing press 03 , The printing works 05 ; 06 ; 07 can also be used in other ways, eg. B. as a three-cylinder offset printing units, as a direct or flexographic printing, as a printing unit for the high pressure or gravure, as a bridge printing unit or H-printing unit or be different from each other.

For example, the printing unit has 05 in the inlet and outlet area of its printing nip 10 in each case a web guiding element 01 on to the freshly printed, not yet dried web 02 at the exit of the printing unit 05 to redirect, for example, to the pressure nip 10 of the following printing unit 06 in the correct orientation.

That on the first printing unit 05 following printing unit 06 points in the inlet and outlet area of the printing gap 10 likewise in each case a web guiding element 01 on to an already printed train 02 contactless through the pressure gap 10 to be able to lead with abolished pressure point. This printing unit 06 as well as the first printing unit 05 together form an imprint work 04 for the flying printing form change. In an operating situation, the train is 02 through the printing unit 05 printed while the web 02 the other printing unit 06 passes through without contact. In the other, in 1 shown operating situation occurs the opposite case. The train 02 is through the printing unit 06 printed while the web 02 the printing unit 05 passes without contact. In Imprintbetrieb is thus of two printing units 05 ; 06 the one printing unit 05 respectively. 06 employed and printed the web 02 while the other one 06 respectively. 05 parked and off the train 02 is passed through without contact.

Among other things are the functions of the imprinting system 04 or imprinters 04 and the printing speed U of the rotary printing machine 03 via a machine control 08 , in particular a software-controlled computer 08 may include, controllable.

On the basis of the existing production and machine data, the software controls TA as a function of the partial support to be printed and that for a plate change in a printing unit 05 ; 06 the imprint 04 or imprinters 04 required total change time GW the continuous printing speed U and the function of the imprinter 04 , In this case, the total changeover time GW is composed of the time required for braking the respective plate cylinder, the time required for the plate change, and the time required to accelerate the respective plate cylinder to the working speed.

U_akt

die aktuelle Fortdruckgeschwindigkeit,

TA_akt

die aktuelle Teilauflage

GW

die Gesamt-Wechselzeit und

A

die Anzahl der pro Umdrehung gedruckten Exemplare bedeuten.

In detail, the control is such that, depending on the current partial edition TA _akt and the total change time GW required for a plate change, the current continuous printing speed U _akt relative to the maximum continuous printing speed U _{max of} the rotary printing press 02 is reduced, as soon as the height of the current partial support TA _{akt is} less than the maximum partial printing speed U _max achievable during the total changeover time GW maximum partial support TA _max . In particular, the current continuous printing speed U _akt can be controlled according to the following relationship: U _act is proportional to or equal to TA _act / (GW × A), where

U _act

the current print speed,

TA _akt

the current partial edition

GW

the total changeover time and

A

mean the number of copies printed per revolution.

For example, if the total changeover time GW is 2 min and the maximum machine speed, ie the maximum execution speed U _{max is} 36,000 rpm, ie 600 rpm, then with a corresponding machine configuration (2 copies per revolution, ie A = 2) a maximum partial circulation TA _max of 1,200 copies / min can be printed.

In order to be able to print at full, ie maximum, continuous printing speed U _max , the height of a partial support TA must therefore be at least 2,400 (2 min à 1,200 copies).

If, for example, the current partial edition TA _akt is only 1200 copies, then the current continuous printing speed U _{akt is} reduced and, according to the above relationship, for example, U _akt = 1.200 / (2 × 2) = 300 rpm.

2 shows a machine layout for a newspaper machine in which a four-high tower 11 is used for printing the four color set, while another printing unit 12 that as a four-tower 12 is formed, the function of the imprinter for black pages takes over. Here are the pressure points 13 and 14 respectively. 15 and 16 of the four-tower 12 alternately set to pressure ON or pressure AB. The web to be printed 02 will then continue through the printing unit 11 led to be printed there with the color components of the page.

The guide rolls 17 and 18 at the inlet and outlet of the paper web 02 in this imprint tower 12 are arranged so that the printing substrate 02 Non-contact is guided by the result in pressure-AB position between the rubber cylinders gap.

3 shows a similar arrangement as a tens tower 19 in which the imprinter operation between the pressure points 21 and 22 respectively. 23 and 24 can be carried out.

The described optimization of the well-known imprinter operation by special control software can thereby obtain a further optimization stage that the production data, which are entered and stored for creating the optimized production process (maximum continuous printing speed for a given partial print height), are used to change the printing plates to be changed in the Order the individual part orders to be processed in the imprinter mode manually or automatically (several printing plate containers or multiple magazine an automatic plate changer) to presort.

This allows a further time optimization of the imprinter operation by shortening the changeover or set-up time, which can be used for optimizing the printing speed or for realizing smaller minimum runs in the imprinter mode.

LIST OF REFERENCE NUMBERS

01

web guide element

02

Web, material web, substrate web, paper web

03

Rotary printing machine, web-fed rotary offset printing machine

04

Imprint, Imprinter

05

Printing unit, printing unit, first, offset printing unit

06

Printing unit, printing unit

07

Printing unit, printing unit

08

Machine control, calculator, software controlled

09

-

10

nip

11

Printing unit, four-tower

12

Printing unit, four-tower, imprinter

13

bruise

14

bruise

15

bruise

16

bruise

17

guide roll

18

guide roll

19

Printing unit, ten-tower

20

-

21

bruise

22

bruise

23

bruise

24

bruise

A

Number of copies per revolution

GW

Total change time

TA

partial edition

TA _akt

current partial edition

TA _max

maximum partial edition

U

Production speed

U _act

current production speed

U _max

maximum printing speed

Claims (7)

Method for operating a rotary printing machine ( 03 ) with an imprinter ( 04 ) for flying plate change, in which the imprinter ( 04 ) two printing units ( 05 ; 06 ), which can be brought alternately into functional position, wherein for the successive printing of several by means of the imprinting ( 04 ) to be printed subassemblies (TA) during printing of a printing unit ( 05 respectively. 06 ) at the other, not in working position located printing unit ( 06 respectively. 05 ) a plate change is feasible, wherein a continuous printing speed (U) of the rotary printing press ( 03 ) is controlled as a function of a height of the partial print (TA _akt ) currently located in the printing, wherein the printing speed (U) of the rotary printing press ( 03 ) is controlled in dependence on a total change time (GW), which is required for the flying plate change, wherein depending on the current partial edition (TA _akt ) and the required for a plate change total change time (GW), the current continuous printing speed (U _akt ) compared to a maximum continuous printing speed (U _max ) of the rotary printing machine ( 03 ) is reduced as soon as the height of the current partial support (TA _akt ) is less than a partial support (TA _max ) which can be achieved at maximum production speed (U _max ) during the total changeover time (GW). A method according to claim 1, characterized in that the current continuous printing speed (U _akt ) is controlled according to the following relationship: (U _act ) proportional to or equal to TA _act / (GW × A), where U _akt the current printing speed, TA _akt the current partial edition GW mean the total change time and A the number of copies printed per revolution. Method according to one of the preceding claims, characterized in that functions of the imprinter ( 04 ) depending on the current partial circulation (TA _akt ). Method according to one of the preceding claims, characterized in that functions of the imprinter ( 04 ) depending on the total changeover time (GW) required for the flying plate change. Method according to one of claims 1 to 4, characterized in that the total change time (GW) at least composed of a time required for braking a respective plate cylinder, a time required for plate change and one for accelerating the respective plate cylinder to an operating speed required time. Method according to one of the preceding claims, characterized in that the method is software implemented. Method according to one of the preceding claims, characterized in that the method in connection with a web-fed rotary offset printing press ( 03 ) is carried out.

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