DE102006031714A1 - Rotary printing press i.e. newspaper printing press, operating method, involves controlling production-printing speed of printing press based on height of partial impression that is provided in printing - Google Patents

Abstract

The method involves bringing printing units (05, 06) into a functional position in an alternative manner, and implementing sheet change for successive printing of partial impression. The production-printing speed of a rotary printing press (03) is controlled based on the height of the partial impression that is provided in the printing and overall changing speed that is required for sheet change. The actual production printing speed is reduced to maximum production printing speed based on the print impression and the changing speed.

Description

The The invention relates to a method for operating a rotary printing press with an imprint for flying plate change according to the preamble of claim 1.

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 In the past the plate change at impression works became often still done manually. In contrast, should in the case of the present invention, the plate changes Automated impression printing.

Of the Invention is based on the object, a method for operating a rotary printing press with an imprinting unit for flying plate change to accomplish.

The The object is achieved by the Characteristics of claim 1 solved.

The particular advantages of the invention are that the printing speed of the rotary printing press on the respective print job is automatically adaptable.

embodiments The invention are illustrated in the drawings and are in Following closer described.

It demonstrate:

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 printing, 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 circulation TA _{akt is} lower than that at maximum Continuous printing speed U _max during the total cycle time GW achievable maximum partial exposure 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 advance speed U _{max is} 36,000 U / s, 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 mm 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 bruises 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 Special control software can thus provide a further optimization level get that production data to create the optimized one Production process (maximum continuous printing speed for a given partial print run height) entered and be held, to be used, the plates to be changed in the order of the individual to be processed in the imprinter mode partial orders manually or automatically (several pressure plate containers or Multiple magazine an automatic plate changer) presort.

This allows a further time optimization of the Imprinterbetriebs by shortening the Change or set-up time, the for an optimization of the production speed or realization smaller minimum runs in Imprinterbetrieb can be used.

01

web guide element

02

Train, Material web, substrate web, paper web

03

Rotary printing press, Fed rotary offset printing machine

04

Imprinter, 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 high tower

12

Printing unit Quad 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 printed 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 Production speed

Claims (9)

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, characterized in that the continuous printing speed (U) of the rotary printing press ( 03 ) is controlled as a function of the height of the partial print (TA _akt ) currently being printed. A method according to claim 1, characterized in that the continuous printing speed (U) of the rotary printing press ( 03 ) is controlled as a function of the total changeover time (GW) required for a flying plate change. Method according to claims 1 and 2, characterized in that, depending on the current partial support (TA _akt ) and the total change time (GW) required for a plate change, the current continuous printing speed (U _akt ) compared to the maximum 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 the 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 3, 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 2 to 6, characterized that the total change time (GW) is at least composed of the required for braking the respective plate cylinder Time, from the time required for plate change and from the for accelerating the respective plate cylinder to the working speed required time. Method according to one of the preceding claims, characterized 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.