DE3135696A1 - PRINTING FOR CHANGEABLE FORMATS - Google Patents

Description

Xoenig & Bauer -Jr- 1981-09-01

Public company P1.574U3

Würzburg / Germany 326 / Ru / vRf

Printing unit for variable formats

The invention relates to a device for transporting a paper web in a printing unit and a Vorricntunq to carry out the procedure according to the generic terms of claims 1 and 2.

Printing machines for variable formats are ζ. ύ. made known by the JB-PS LI69 210. Regardless of the format, a paper web is transported in a certain length through a pressure gap between two cylinders and then withdrawn by a certain amount of time. Here two loop legs are provided, which are mounted on a common slide.

This device is part of the fact that it is because of the and the movement of the slide with the loop legs none in the sense of the new status aar Tecnni / Z honing Production speeds.

The invention is based on the task, a misplacing and to create a device to carry out the fermentation, with which it is possible to have an adjustable format continuous printing, unwinding and processing with only a short piece of paper web to have to move back and forth the paper ban by the old moving Machine elements are required.

Koenig & Bauer - «8- - 1981-09-01

Aktienqesellsctiaft P1.574DE

WürzDurg / Germany »

would be given according to the invention by the subject matter of Claims 1 solved.

The advantages achieved with the invention are in particular in that the device can be arranged immediately before and after de; ti or the urukKzylindem, so that only a short piece of paper can be moved back and forth liiuii. This ensures that the production run is in register ozw. has a favorable influence on the editing register. The speed of production and rune of the machine can be increased significantly because there is no reciprocating Machine parts are necessary. The format changeover is much easier. The paper tension of the durcn the printing unit running web can easily be changed by the regulated groups of draw rollers.

An exemplary embodiment of the invention is shown in the drawing and is described in more detail below. she shows

a printing unit with the device according to the invention.

From a paper supply roll, not shown, a paper web 1 is a printing unit 2 by means of one of a üauptantrieo 3 driven pull roller group 4 supplied. The paper tooth 1 is guided from the pull roller group 4 to a first paper tooth store 6. The paper web store ö consists of a roller 7 which is hung on two arms 8. the two arms 8 are positively connected to a shaft

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fCoenig & Bauer - '* & - 1981-09-01

Public company P1.574Dj3

Würzburg / Germany

bundles that are held in both side frames of the 2 is rotatably mounted. At one end of the vj'elle is a Drive pin of an electric rotary magnet 5 angeujjpeit. The housing of the rotary magnet 5 is oefestiqt on the side frame, The torque of the rotary magnet 5 is continuously adjustable in a known manner and acts in the '// iron that the paper spell 1 between pull roller group 4 and roller 7 of the paper oahn memory 6 is held taut with a predetermined force. the Paper web tension is set between roller 7 and pull roller group 4 in a known manner and kept constant.

The paper spell 1 wraps around the roller 7 from above by about 1dO ° and then zv; ei below and at a distance to the left ozw. To the right of it arranged and mounted in the side frames guide rollers 9 and 11. The guide roller 11 is the paper web 1 is fed to a second drawing roller group 12 driven by an electric motor. She wraps around one first Anpreßwaize 13 and then a draw roller 14 of the feed roller group 12 practically free of slippage. From the draw roller 14, the leads Paper web 1 over a deflection roller 16 through a pressure nip between the horizontally opposite back cylinders 17 and 1b to a third drawing roller group 19. The third drawing roller group 19 consists of an electric motor driven draw roller 21 and a pressure roller 22 placed on it. After the pressure roller 22, the paper web traverses 1 a second paper web store 23. The second paper web store 23 consists of the same elements like the first paper web store 6, namely a roller 24,

(ο

Koenig & Bauer - 4T- 1981-09-01

Public limited company P1.574DE

Würzburg / Germany

two arms 26 and an electric rotary magnet 27. From the second paper web store 23, the paper web 1 runs into a fourth driven by the main drive 3 of the printing machine Pull roller group 28 and from there into one or more downstream printing units or processing stations, which the Continue to process paper web 1 running at a uniform speed, e.g. B. print or cut across.

The draw rollers 14 and 21 of the second and third draw roller groups 12, 19 are each provided with an encoder disk as an actual value transmitter and are each equipped with a DC motor driven.

An encoder is attached to one of the pressure cylinders 17, 18 as a setpoint generator coupled. The encoders have a high resolution and send their impulses to a digital comparator circuit away. Second and third pull roller groups 12, 19 each have their own control circuit for their DC motor, so that between the second and third pull roller group 12, 19 a desired paper web tension is set and maintained can be.

When printing, the paper web 1 is through the printing nip of the impression cylinders 17 printing in perfecting, transported as long as the printing plates act on them. When passing through the clamping device channels 10 of the two pressure cylinders 17, 18 through the press nip, the second and third pull roller groups 12, 19 take over the further transport

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Koenig & Bauer Aktiengesellschaft föürzburg / Germany

- -er -

1981-03-01 P1.574DE

the paper web 1, in the following way: 1st step: braking the paper web 1 from production speed with constant delay or according to a sine function on a route from Z. B. 6Ü, 0 mm to a standstill; 2ο step backward movement of the paper web 1 from the

Standstill with constant acceleration or according to a sine function on a d-track of, for example, 60, Ü mm;

3rd step: slowing down the backward movement of the paper web 1

with constant delay or according to a sine function on a distance of z. B. 60.0 mm to a standstill;

4th step: Forward movement of the paper tooth 1 from the

Standstill with constant acceleration or according to a sine function up to production speed on a distance of z. B.60.0mm ..

With the maximum format, the durations for all four steps are the same; with the minimum format, the durations are the same the same for the first and fourth step, and also the same size as for the maximum format; the durations of the second and third steps are also the same size, but compare with the maximum format correspondingly longer.

Or you could also do the following:

First and second step the same, third and fourth step are the same as each other, but different (longer) to the first and second step.

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Koenig & Bauer - -6- - 1981-09-01

Public limited company P1.574DE

Würzburg / Germany

In the case of a smaller format, however, instead of the paper web 1 stopping during the passage through the tensioning means channels 10 through the printing nip, stopping during the passage of a cylinder 17 on a circumference of the printing and / or 18 print-free limited by the end of the format and the beginning of the format Area done through the pressure gap between the two pressure cylinders 17 and 18.

First paper web spexcher 6 in front of the printing unit 2 and the second Paper web storage devices 23 after the printing unit 2 ensure that the paper web 1 is continuously withdrawn from the supply roll or fed continuously to the processing station after printing.

/ Parts list

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Koenig & Sauer - '' "? · - 1981-09-01

Public limited company P1.574D.3

Würzburg / Germany

Parts list Paper web 1 Printing unit 2 Main drive 3 Pull roller group, first 4th Rotary solenoid 5 Paper web storage, first 6th roller 7th poor 8th Deflection roller 9 Clamping device channel 10 Deflection roller 11 Pull roller group, second 12th Pressure roller 13th Pull roller 14th 15th Deflection roller 16 Printing cylinder 17th Printing cylinder 13th Pull roller group, third 19th 20th Pull roller 21st Pressure roller 22nd Paper web storage, second 23 roller 24 25th Arm (23) 26th

27 rotary solenoid

23 Z uq w a1ζ e nq r group, fourth / Claims

AO

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Claims (7)

Koenig & Bauer -JST- 1981-U9-01 Public limited company P1.574DE Würzburg / Germany Claims A method for transporting a paper web in a printing unit of a rotary printing machine by means of two pull roller groups for printing the paper web with variable, contiguous formats between two non-exchangeable cylinders, where the paper web is pulled back through a printing gap between the cylinders after printing, characterized in that the Paper web (1) between two pull roller groups (12; 19) driven in a reversing mode is clamped in praictiscn slip-free that the paper web (1) passes through a print-free area bounded on a circumference of the printing cylinder (17; 18) by the end of the format and the beginning of the format a printing nip is approached, that then from the standstill the paper web (1) is moved back to a standstill by twice the amount of the distance depending on the format, that from this standstill the paper web (1) on the distance up to the printing nip at the peripheral speed two cylinders (17, 18) is accelerated. 2. The method according to claim 1, characterized in that the drawing roller groups (12; 19) regulated elektromotoriscn are driven. 3. The method according to claim 1, characterized in that the pull roller groups (12; 19) controlled hydraulically driven will. Koenig & Bauer - V - 1981-09-01 Public company P1.574DS vfürzburg / Germany 4. Printing unit for printing variable, contiguous formats with two driven pull roller groups and two paper web stores, characterized in that the two pull roller groups (12; 19) are driven in a controlled manner and are arranged within the printing unit (2) that the pull roller groups (12; 19) vertically one above the other, and the first (12) above and the second (19) below the pressure gap of two cylinders (17 _r 18) are arranged. 5. Printing unit according to claim 4, characterized in that an actual value transmitter is coupled to a draw roller (14; 21) of the draw roller groups (12; 19) in the printing unit (2) is that a setpoint generator is coupled to a cylinder (17, 18) directly involved in the printing process. 5. Printing unit according to claim 4 to 5, characterized in that that the drawing roller groups (12; 19) are driven regulated by an electric motor. 7. Printing unit according to claim 4 or 5, characterized in that that the pull roller groups (12; 19) are controlled hydraulically driven. / Summary / 10