DE102010003385A1 - Method for executing order change at sheet fed printing press, involves using part of waste sheet, which is generated on active printing elements, in printing elements as starting waste sheet for printing process - Google Patents

Abstract

The method involves assigning a blanket cylinder (4) to a plate cylinder (3), where the rubber cylinder cooperates with a printing cylinder (5). Goods sheet is printed on an active printing element (A, B), and clean pressure waste sheet is produced for cleaning printing of the blanket cylinder. Printing elements (C, D) are passed after the good sheets and a printing process is started. A part of the waste sheet, which is generated on the active printing elements, is used in the printing elements as a starting waste sheet for the printing process.

Description

The invention relates to a method for performing a job change sheetfed presses according to the preambles of the first and second claim.

Methods for operating a sheet-fed printing press are known in which the flying plate change known in web-fed printing presses is used. A flying plate change is generally understood to mean that a new order is already prepared during the execution of a first order. It is understood by preparing that the printing plate is changed at an inactive, not involved in the pressure of the printing unit, while the sheet-fed printing machine executes a print job.

From the DE 102 57 282 A1 Such a method has become known. Here, the drive of the plate cylinder is effected by a separate drive motor, which is synchronized with the main drive gear train of the sheet-fed press. To change the printing plate, the inking unit and the dampening unit are uncoupled from the plate cylinder, the plate cylinder is the blanket cylinder, the blanket cylinder from the printing cylinder and the inking rollers of the inking unit and dampening rollers of the dampening unit are parked by the plate cylinder. With the known means the printed printing plate is removed and clamped a new pressure plate. The inking unit and the dampening unit are turned back on and the new printing plate is inked. Thus, this printing unit is ready to carry out the subsequent print job.

After processing the current order, the sheetfed offset press must be transferred to the start of the follow-up order in a set-up mode. This means that the sheetfed offset press is shut down or operated at a low speed to set up and start the next job. Setting up is understood as the implementation of measures by which the relevant printing unit is prepared for the follow-up order. These measures are in particular the cleaning of the blanket cylinder and the printed plates. This is done by the so-called clean printing.

The clean printing is in the DE 10 2005 040 011 A1 described. At the relevant printing unit, the inking rollers of the inking unit are parked from the forme cylinder and the plate cylinder and the blanket cylinder remain for a predetermined period of time or for a predetermined number of cylinder revolutions in Druckanstellung.

Only when this cleaning is done, the new order can be started. Clean printing produces clean-print waste sheets that have to be transported from the sheetfed press. Furthermore, losses of sheet material also arise from the fact that for proofing of the subsequent order also waste paper, the so-called start-up spoil sheets arise. This is followed by losses of sheet material as well as loss of time.

The invention therefore has the object to develop a method for performing a job change sheetfed presses, can be saved by the waste during the transition from a print job to a follow-up contract.

This object is solved by the features of the first and the second claim.

The invention will be explained in more detail with reference to exemplary embodiments. The corresponding drawings have the following meaning

1 Sheet-fed printing machine in aggregate construction, the active printing units are arranged in sheet travel direction in front of the inactive.

2 Sheet-fed printing machine in aggregate design, the active printing units are arranged in sheet travel direction behind the inactive.

Like from the 1 can be seen, the sheet-fed press several printing units A, B, C, D on. To carry out the method according to the invention, at least two printing units are required.

The sheet-fed press suitable for the application of the method according to the invention has a feeder 1 on which a sheet pile 11 with the printed sheet provided for printing 12 assigned. In sheet travel direction 16 seen is a bow plant 2 downstream. This is followed by the printing units A, B, C, D. The printing units A, B, C, D are identical, so that their description is made below by the printing unit A and is omitted in the figure to the name of the corresponding components of the other printing units B, C, D.

Each printing unit A, B, C, D has a plate cylinder 3 on, on whose lateral surface a pressure plate 10 is mounted. The plate cylinder is an inking unit 7 , a dampening unit 8th and a rubber cylinder 4 assigned. The rubber cylinder 4 has contact with a printing cylinder 5 ,

Between the printing units A, B, C, D is ever a transfer drum 6 arranged and at each printing unit A, B, C, D is in each case a plate changing device 9 for feeding and removing the printing plates 10 intended. In the printing units C and D is the plate changing device 9 shown in the plate change position. In this case, the direction of movement of the discharged printed printing plate 10 indicated by an arrow, as well as the feed direction of the new printing plates 10 , In the printing units A and B is the plate changing device 9 inactive.

The printing units A, B, C, D is in the sheet running direction 16 seen a display 13 downstream.

The investor 1 , the bow plant 2 , the printing units A, B, C, D and the delivery 13 are via signal lines 14 or via a bus with a central control computer 15 connected. In the figure, only one signal line is designated by way of example.

With the sheet-fed printing machine described above, the following method according to the invention is realized:
Before the start of printing, it is necessary to complete a print job that prints the printed plate 10 from the plate cylinder 3 removed and a new printing plates 10 is spanned. This is done by the plate changing device 9 ,

The on the plate cylinder 3 arranged pressure plate 10 is through the inking system 7 dyed and through the dampening unit 8th moistened. The printing plate 10 puts the color on the rubber cylinder in a motivational way 4 from.

To process a print job is by a sheet separator not shown here in each case the uppermost sheet 12 from the sheet pile 11 isolated and added to the sheet course. The print sheet 12 is in a nip between the rubber cylinder 4 and the impression cylinder 5 led and printed there.

An advantageous embodiment of a sheet-fed printing machine for carrying out the method according to the invention is that the pressure cylinder via a main drive train, not shown 5 , the transfer drums 6 and the rubber cylinders 4 be driven by a first drive motor while each plate cylinder 3 each driven by a second drive motor, also not shown.

For plate change then every plate cylinder 3 driven by the associated second drive motor, while the blanket cylinder 4 , the printing cylinder 5 and the transfer drum 6 be moved by the first drive motor. In a further embodiment, the blanket cylinder 4 from its own drive or with the same drive as the plate cylinder 3 driven.

First embodiment

Like in the 1 shown, a print job is handled at the active printing units A, B, while preparatory measures for the following print job are made to the downstream in the sheet running direction printing units C, D. This includes in particular the above-described changing the printing plates 10 through the plate changing device 9 , These operations are completed within the period in which the printing on the active printing units A, B is performed. In this case, there is no operative connection between the blanket cylinder in the printing units C, D 4 and the impression cylinder 5 unless the cylinder pairs are rubber cylinders 4 / Pressure cylinder 5 are used for bowing.

Like from the 1 it can be seen, during the printing in the printing units A, B, C, D, an operative connection between the printing cylinder 5 , the rubber cylinder 4 , the plate cylinder 3 , the inking unit 7 and the dampening unit 8th , After the end of the printing process on the printing units A, B, that is, when the last good sheet has left the printing unit A, B, the inking unit 7 and the dampening unit 8th from the plate cylinder 3 switched off. For a predeterminable number of sheets 12 becomes the rubber cylinder 4 on the printing cylinder 5 leave to the blanket cylinder 4 and those on the plate cylinders 3 clamped printing plates 10 rid of paint residues. The printed sheets printed in this phase 12 are waste and are referred to as Sauberdruck-Makulaturbogen. The process itself is known by the term clean printing.

It is also possible only the plate cylinder 3 from the rubber cylinder 4 shut off and the inking unit 7 and dampening unit 8th hired to leave. This will only the rubber cylinder 4 freed of paint residues.

The clean printing paper sheets produced by the clean printing become the sheet travel direction 16 downstream printing units C, D supplied. At these printing units C, D, the preparatory measures for the processing of the upcoming print job are completed and the printing process can be initiated.

At the beginning of printing, it is inevitable that run-up spoils sheets are generated. According to the invention, at least a portion of the waste sheet generated by the still active printing units A, B as a result of clean printing in the used with the start printing printing units C, D used to generate the tarnish waste sheet. In this case, the time of the beginning of the printing at the other printing units C, D is predetermined and set so that the continuous printing is then made at the other printing unit when the last good sheet of the active printing units A, B passes the respective further printing unit C, D. Has. The setting of the printing is done by establishing the operative connection between blanket cylinder 4 and the impression cylinder 5 ,

Advantageously, the time of the beginning of the print run at the other printing units can be determined by the predefined total number for the clean-pressure paper sheets and the number of clean-printing paper sheets to be used as start-up waste. These values can be entered by the printer or provided to the controller as default data. The number of clean-pressure waste paper, which is used in the other printing as start-up waste, is chosen freely according to printing technology.

Second embodiment

Like in the 2 shown, a print job is handled at the printing units C, D, while preparatory measures for the following print job are taken at the upstream in the sheet running direction printing units A, B. In particular, the printing plates are changed at these printing units A, B. These processes are completed within the time period for the printing in the printing units C, D.

As described above, waste sheets are produced in the printing units C, D after completion of the printing.

According to the invention, the initiation of the printing process on the printing units A, B takes place with a predeterminable number of revolutions prior to the completion of the production of the clean-printing waste sheets on the printing units C, D. Preferably, the first start-up waste sheet obtained at the start of the printing operation follows the last on the printing unit Printing unit C, D produced clean-pressure waste paper immediately.

That is, the number of sheets required for clean printing 12 The printing units A, B must have happened so that no required for the clean printing sheet is covered with ink. This could challenge the function of clean printing. Preferably, when the first start-up waste sheet arrives at the printing unit C, the last clean-printing spoil sheet has left it and the operative connection between the blanket cylinder 4 and the impression cylinder 5 can be canceled.

The invention is not limited to the above-described arrangement of printing units. In place of a printing unit can also be a coating unit, wherein instead of a blanket cylinder cooperating with a paint supply, equipped with a paint plate paint cylinder is present. In this case, both the active coating unit can be arranged in front of and behind a further coating unit. Combinations between printing units and coating units are also conceivable. Thus, an active printing unit in front of another coating unit, on which a flying coating plate change takes place, be arranged. The reverse case is also not excluded.

Furthermore, it is possible for further printing units to be present in the sheet-fed printing press which are either involved in the printing process on the active print job and in the subsequent job or are not involved in the printing process and in this case can also serve for bowing. In the case of use for sheet guiding the blanket cylinder or the paint form cylinder remains in operative connection with the impression cylinder.

LIST OF REFERENCE NUMBERS

1

investor

2

sheet feeder

3

plate cylinder

4

rubber cylinder

5

pressure cylinder

6

transfer drum

7

inking

8th

dampening

9

Plate changing device

10

printing plate

11

sheet pile

12

sheet

13

display

14

signal line

15

control computer

16

Sheet running direction

A

printing unit

B

printing unit

C

printing unit

D

printing unit

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10257282 A1 [0003]
• DE 102005040011 A1 [0005]

Claims (5)

Method for carrying out a job change on sheet-fed printing machines, wherein the sheet-fed printing machine has at least two printing units (A, B, C, D), each printing unit (A, B, C, D) one with a inking and dampening unit ( 7 . 8th ) equipped plate cylinder ( 3 ), the plate cylinder ( 3 ) with a pressure cylinder ( 5 ) cooperating rubber cylinder ( 4 ) is assigned and the job change is performed by at at least one active printing unit (A, B) of the continuous printing is performed and at least one in the sheet travel direction ( 16 ) downstream non-active further printing unit (C, D) prepared for another printing process, characterized in that after after the active printing unit (A, B) the last good sheet has been printed, a number of clean printing spoil sheets for clean printing of the blanket cylinder ( 4 ) are generated and after the last good sheet the other printing unit (C, D) has passed, where the further printing process is started, wherein at least a portion of the active printing unit (A, B) generated clean-paper waste sheet in the further printing unit (C , D) is used as start-up spoof sheet for this further printing process. Method for carrying out a job change on sheet-fed printing machines, wherein the sheet-fed printing machine has at least two printing units (A, B, C, D), each printing unit (A, B, C, D) one with a inking and dampening unit ( 7 . 8th ) equipped plate cylinder ( 3 ), the plate cylinder ( 3 ) with a pressure cylinder ( 5 ) cooperating rubber cylinder ( 4 ) is assigned and the job change is performed by at at least one active printing unit (C, D) of the continuous printing is performed and at least one in the sheet travel direction ( 16 ) upstream further printing unit (A, B) prepared for another printing process, characterized in that after the active printing unit (C, D) of the last good sheet has been printed, a number of clean printing waste sheets are generated and the printing process the further printing unit (A, B) is started a predetermined number of revolutions before the completion of the generation of the clean-pressure paper sheet. A method according to claim 1 or 2, characterized in that the waste sheets for clean printing of the blanket cylinder ( 4 ) are generated at the respective active printing unit by, for a number of revolutions, the operative connection between the blanket cylinder ( 4 ) and the plate cylinder ( 3 ) or between the plate cylinder ( 3 ) and the inking and dampening unit ( 7 . 8th ) is released, without the operative connection between the blanket cylinder ( 4 ) and the impression cylinder ( 5 ) and the sheet feed is interrupted. A method according to claim 2, characterized in that the first start-up of the printing process start-up waste sheet immediately follows the last on the printing unit (C, D) generated clean-pressure paper sheet. A method according to claim 1 or 2, characterized in that instead of a printing unit, a coating unit occurs, wherein instead of a blanket cylinder cooperating with a paint supply, equipped with a paint plate paint cylinder is present.

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