EP2067621B1 - Method of operating a sheet printing press with lacquering unit - Google Patents

Abstract

The method involves accomplishing a paint form change at a plate cylinder (22) of a painting unit (14) parallel to an assembling function at a printing unit (13) such that the painting unit is completely decoupled from a main drive of a sheet fed printing machine (10) to the paint change form. The cylinder of the painting unit is driven by a separate drive. The printing unit is synchronously coupled to the main drive of the machine after implementing the paint form change. Cylinders of the printing unit are driven by the main drive.

Description

The invention relates to a method for operating a sheet-fed printing press according to the preamble of claim 1.

In a sheet-fed printing press sheets are moved to print through several printing units. Each printing unit has an impression cylinder, a rolling on the impression cylinder transfer cylinder and a rolling on the transfer cylinder form cylinder, the transfer cylinder is also referred to as a blanket cylinder and the forme cylinder as a plate cylinder. Sheet-fed presses can, in addition to the printing units, continue to have coating units in order to additionally paint the printed sheets printed in the printing units. A coating unit has an impression cylinder and a form cylinder rolling on the impression cylinder.

In particular, for adapting a sheet-fed printing machine to a new print job must be performed on the printing units and the coating units of the same setup tasks, such. B. a printing plate change to the cylinders of the printing units and a Lackformwechsels to the cylinders of the Lackwerke. In order to increase the availability of a printing press for the printing process, set-up tasks must be carried out within a very short time, which is why setup tasks at the printing units are carried out largely parallel to set-up tasks at the coating plants. In this case, a paint form change to the coating units of the sheet printing machine is a critical size, as in a coating unit of the form cylinder of the coating unit on the impression cylinder of the same, which is associated with a gripper device for transporting the sheet rolls, which ensures when performing the coating form change and after execution of the paint form change must be that there is no risk of collision between the form cylinder and the impression cylinder associated grippers.

DE 102 2005 018 677 A1 discloses a drive for a processing machine, especially a printing machine, and a method for driving the same. For processing the sheet material, the cylinders and drums for the transport of printing material as well as the plate cylinders or forme cylinders arranged in the individual works are driven by a common gear train of at least one drive motor of a main drive together with associated machine control. To change the printing plate, the main drive with gear train is separated from the respective plate / forme cylinder and then an auxiliary drive is activated, which rotates and positions the plate / plate cylinder in a printing end position. Thereafter, the printing plate changing operations are performed and the plate / forme cylinder is rotated and positioned to fix the printing plate in the print start position. Subsequently, the main drive is stopped with gear train and the current actual angle of the processing machine determined. Thereafter, the activated auxiliary drive rotates the plate / forme cylinder in the engagement angle corresponding to the actual angle and in this coupling position of the main drive is coupled with gear train to plate / forme cylinder.

EP-A-1 757 448 discloses a method of operating a printing press, especially for performing a flying plate change on at least one printing unit of a printing press, while other printing units are operated in the production run. The form cylinder operated in the continuous printing units are directly driven by a self-propelled or direct drive and the inking units and possibly the dampening units operated in the continuous printing units are driven by a main drive. At the printing unit at which a printing plate change is carried out, the inking roller and possibly the dampening roller from the respective forme cylinder are parked. When changing the printing plate on a printing unit, the inking unit and possibly the dampening unit continues to be driven by the main drive or driven by the individual drive or direct drive assigned to the respective plate cylinder.

There is therefore a need for methods for operating a sheet-fed printing press, with which despite this problem coating form change in coating units parallel to Setup tasks on printing units of a sheetfed press can be performed.

On this basis, the present invention is based on the problem to provide a novel method for operating a sheet-fed press.

This problem is solved according to a first aspect of the invention by a method according to claim 1. Thereafter, a coating form change to a forme cylinder of a coating unit is parallelized to setup tasks on the or each printing unit feasible that decoupled for Lackformwechsel the respective coating unit completely from a main drive of the sheet-fed press and the cylinders of the respective coating unit are driven by a separate drive, and that after execution the coating reform the respective coating unit is at least partially synchronously coupled or in register with the main drive of the sheet-fed press.

The problem can also be solved according to a second aspect. Thereafter, a paint form change on a forme cylinder of a coating plant is parallelized to setup tasks on the or each printing unit feasible that remains coupled to Lackformwechsel the impression cylinder of the respective coating unit to a main drive of the sheet-fed press, whereas the forme cylinder of the respective coating unit is disconnected from the main drive and a separate Drive is driven, and that is driven synchronously or in register to the impression cylinder of the respective coating unit after execution of the paint form change the form cylinder of the respective coating unit. With the method according to both aspects of the present invention, coating form changes can be carried out in parallel with setup tasks on printing units, in particular for printing form changes on printing units, without there being a risk of collision between the forme cylinder of the coating unit and the counter-pressure cylinder of the coating unit associated grippers in the area of the coating unit.

Fig. 1:

eine schematisierte Darstellung einer Bogendruckmaschine zur Verdeutlichung des erfindungsgemäßen Verfahrens.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

Fig. 1:

a schematic representation of a sheet-fed press to illustrate the method according to the invention.

The present invention relates to a method for operating a sheet-fed printing machine, the method according to the invention being described below with reference to FIG Fig. 1 is described. So shows Fig. 1 a sheet-fed printing machine 10 with a feeder 11 and a boom 12, wherein eight printing units 13, two coating units 14 and a drying module 15 are positioned between the feeder 11 and the boom 12 in the illustrated embodiment. Printing sheets to be printed are first moved starting from the feeder 11 through the printing units 13 and then through the coating units 14, printed printed sheets being discharged from the sheet-fed printing press in the area of the delivery arm 12.

Unlike the in Fig. 1 As shown embodiment of a sheet-fed press, it is also possible that alternatively or additionally coating units are arranged upstream of the printing units or that coating units are positioned between printing units.

Each printing unit 13 has an impression cylinder 16, a rolling on the impression cylinder 16 transfer cylinder 17, a rolling on the transfer cylinder 17 forme cylinder 18, a non-illustrated inking unit and preferably a non-illustrated dampening unit. The transfer cylinders 17 of the printing units 13 are also referred to as a blanket cylinder and the forme cylinder 18 of the same as a plate cylinder.

Between adjacent printing units 13 transfer cylinders 19 are arranged in the illustrated embodiment, by means of which the printed sheets to be printed can be transported from a printing unit 13 to a subsequent printing unit 13. According to Fig. 1 one of these cylinders is designed as a transfer and turning cylinder 20, so that the printed sheets can be printed on both sides.

Each coating unit 14 also has an impression cylinder 21, wherein on the impression cylinder 21 of the coating units 14 a form cylinder 22 rolls the same. Furthermore, each coating unit has a Lackauftragwerk 23. On the form of cylinders 22 of the coating units 14 paint forms are positioned. On the form cylinders 18 of the printing units 16 printing forms are positioned.

In the exemplary embodiment shown, the drying module 15 is arranged between the two coating units 14. Transfer cylinders 19 are likewise positioned between adjacent coating units 14, as between adjacent printing units 13 and between the last printing unit 13 and the subsequent coating unit 14.

To convert a sheetfed press to z. B. a new print job 14 setup tasks must be performed both in the field of printing units 13 and in the field of Lackwerke, with set-up tasks to be performed on the coating units 14 parallelized to setup tasks on the printing units 13.

The present invention now relates to such methods for operating a sheet-fed printing press 10, with the aid of which paint mold change to the forme cylinders 22 of the coating units 14 parallelized to setup tasks on the printing units 13, in particular parallelized to form changes to the form cylinders 18 of the printing units 13 and / or parallelized for washing transmission cylinders and / or counter-pressure cylinders.

According to a first aspect of the present invention, a paint form change on the forme cylinders 22 of the coating units 14 is parallelized to setup tasks on the printing units 13 feasible that the Lackformwechsel the respective coating unit 14 is completely decoupled from a main drive of the sheetfed press and the cylinder of the respective coating unit 14th Thus, both the impression cylinder 21 and the forme cylinder 22 of the respective coating unit 14, are driven by a separate drive. After execution of the paint form change, the respective coating unit is at least partially coupled synchronously or in register with the main drive of the sheet-fed press.

As a separate drive, each coating unit 14 can be assigned either an auxiliary drive or a direct drive, wherein an auxiliary drive can be used exclusively for setup purposes and a direct drive for setup purposes as well as in the production run.

Then, when the coating units 14 are assigned as separate drives auxiliary drives, the entire coating unit 14 is synchronously or registered in register with the main drive of the sheet-fed press coupled to the execution of the paint form change, so that in the production all cylinders of the respective coating unit 14, so impression cylinder 21 and forme cylinder 22nd , driven by the main drive of the sheet-fed printing press.

Then, however, if the Lackwerken 14 are assigned as separate drives direct drives, only the impression cylinder 21 of the respective coating unit 14 is coupled in register with the main drive after execution of the paint form change, so that the counter pressure cylinder 21 of the coating units 14 are driven by the main drive of the sheet-fed press in the continuous printing, whereas the forme cylinder 22 of the coating units 14 are driven in self-motor mode by the direct drives synchronously to the main drive. In emergency mode, e.g. in case of failure of the direct drive, the forme cylinder can also be driven by the main drive.

In the print run all cylinders of the printing units 13, so-the impression cylinder 16, the transfer cylinder 17 and the forme cylinder 18 thereof, driven by the main drive of the sheet-fed press. Alternatively, it is also possible that in the continuous printing of the sheet-fed press only the impression cylinder 16 and transfer cylinder 17 of the printing units 13 are driven by the main drive of the sheet printing machine, however, that the forme cylinder 18 of the printing units 13 are driven by the form cylinders direct drives directly synchronous to the main drive self-propelled.

At this point, it should be noted that the coating forms can be both varnish plates and varnish wipes or even lacquered sleeves. Likewise, the printing forms may be printing plates or printing sleeves.

Then, if paint plates or lacquer wipes are used with a metallic carrier or plastic carrier, an automated, especially a fully automatic or semi-automatic, paint plate change can be performed using a change machine. Such automatic change machines include an automatic tensioning rail in the region of the forme cylinder 22 of the respective coating unit, a replaceable shaft for storing the coating plates and optionally a pressure roller on the forme cylinder for guiding the coating plate.

According to a second aspect of the present invention, a paint form change to the form cylinders 22 of the coating units 14 is parallelized to setup tasks performed on the printing units that remains coupled to the paint form change the impression cylinder 21 of the respective coating unit 14 to a main drive of the sheet printing machine 10, whereas the forme cylinder 22nd the respective coating unit 14 is disconnected from the main drive and is driven by a separate drive. The separate drive can in turn be an auxiliary drive, which is used exclusively for setup tasks, or a direct drive, which is also used in the production run. After execution of the paint form change of the forme cylinder of the respective coating unit 14 is again synchronized with the impression cylinder 21 of the respective coating unit 14 and thus driven to the main drive. For form change of the form cylinder 22 of the respective coating unit 14 is turned off by the impression cylinder 21, decoupled from the impression cylinder 21 and driven by the coating unit 14 associated separate drive, which, as already mentioned, is designed either as an auxiliary drive or as a direct drive.

Then, when the separate drive is designed as an auxiliary drive, the form cylinder 22 of the respective coating unit 14 is employed again for printing after completion of the paint form change of the respective impression cylinder 21 and coupled to the same, in which case all the cylinders of the respective coating unit 14 in the continuous printing of the main drive Sheet-fed printing machine to be driven.

Then, however, when the separate drive is designed as a direct drive, the form cylinder 22 of the respective coating unit 14 is employed again to the impression cylinder, the form cylinder 22, however, remains disconnected from the impression cylinder 21 of the respective coating unit 14, so that in the continuous printing of the impression cylinder 21 of the respective coating unit from the main drive of the sheet-fed printing machine and the forme cylinder 22 of the respective coating unit from the direct drive is driven in self-motor synchronous to the main drive.

In continuous printing, when the coating unit 14 is associated with a direct drive, a coarse synchronization between the forme cylinder 22 and the counter-pressure cylinder 21 of the respective coating unit 14 via an auxiliary toothing or via a superposition gear or other synchronization device is ensured.

When carrying out a coating form change according to the second aspect of the invention may be between the forme cylinder 22 and the impression cylinder 21 of the respective coating unit 14 a protective device by z. B. retraction or swinging be positioned. This can be done in the range of a coating unit 14, a separation of work areas to z. B. in the area of the impression cylinder 21 to carry out a washing process, while above in the form of the cylinder 22, a coating form change takes place. As a result, different setup tasks can be carried out in parallel in the coating unit.

Then, when parallel to the paint form change on the forme cylinder of the respective coating unit, the printing press is operated in the continuous printing, the protective device serves the separation of the working areas and the sheet guide in the area of the coating unit.

By pivoting or stopping the self-powered forme cylinder relative to the impression cylinder of the coating unit and the introduction of serving as a sheet guide between the forme cylinder and the impression cylinder of the coating unit, it is also possible to put the same form cylinder to save energy in unused coating unit. When re-use of the coating unit can then be operated synchronously to the impression cylinder by means of direct drive again the forme cylinder.

Also according to the second aspect of the present invention, it is possible that in the printing either all cylinders of the printing units 13 are driven by the main drive of the sheet-fed press, or that only the impression cylinder and the transfer cylinder of the printing units 13 are driven by the main drive, whereas the forme cylinder synchronously is driven by a direct drive of the respective printing unit 13 own motor.

Then, when a forme cylinder 22 of a coating unit 14 is associated with a direct drive, the paint mold positioned on the forme cylinder 22 of the respective coating unit 14 is circumferentially registerable relative to the printing units 13 via the direct drive of the forme cylinder 22 of the coating unit.

Furthermore, it is then possible to align or correct the start of printing in the corresponding coating unit 14 to the beginning of printing in the printing units 13.

In addition to such Druckanfangskorrektur is when a coating unit 14 is associated with a direct drive, a print length correction possible, with seen at a print length correction of the forme cylinder 22 of the respective coating unit 14 over the circumference or the length of a paint form of the forme cylinder 22 accelerates and / or braked is to allow a printing length correction relative to the printing units 13. In order to allow a match in the print start of coating units and printing units in such a print length correction, compensation for acceleration and / or deceleration over the length of the paint form in the clamping channel of the forme cylinder 22 of the respective coating unit 14 is placed.

A circumferential register correction and / or print start correction and / or print length correction is possible in both aspects of the present invention when the coating units 14 and the forme cylinders 22 are assigned to the same direct drives.

When using the method according to the second aspect of the present invention, if two or more coating units 14 are present in the sheet-fed press, a flying coating form change is possible such that at least one coating unit is used in the continuous printing of the sheet-fed printing machine for painting, while at least another coating plant set up work. After completion of the set-up work can then be painted with a converted coating unit, whereas a previously used for painting coating unit is retrofitted.

LIST OF REFERENCE NUMBERS

10

Sheetfed

11

investor

12

boom

13

printing unit

14

coating unit

15

drying module

16

Impression cylinder

17

transfer cylinder

18

form cylinder

19

transfer cylinder

20

Transfer and turning cylinder

21

Impression cylinder

22

form cylinder

23

Varnishing plant

Claims (5)

1. A method for operating a sheet-fed printing machine (10), wherein the printing machine (10) comprises a feeder, a delivery (12), at least one printing couple (13) at least one coater (14) and a plurality of drives, wherein each printing couple (13) comprises a plurality of cylinders (16 to 18), namely an impression cylinder (16), a transfer cylinder (17) rolling off the impression cylinder (16) and a form cylinder (18) rolling off the transfer cylinder (17), wherein each coater (14) comprises a plurality of cylinders (21, 22); namely an impression cylinder (21) and a form cylinder (22) rolling off the impression cylinder (21), wherein on the form cylinder (18) of the or each printing couple (13) at least one printing form each and on the form cylinder (22) of the or each coater (14) at least one coating form each are positioned, and wherein setting tasks on the or each coater (14) can be carried out parallelized with setting tasks on the or each printing couple (13) and a coating form change on a form cylinder (22) of a coater (14) can be performed parallelized with setting tasks on the or each printing couple (13), characterized in that for the coating form change the respective coater (14) is completely decoupled from a main drive of the sheet-fed printing machine (10) and the cylinders (21, 22) of the respective coater (14) are driven by a separate drive, and that following the execution of the coating form change the respective coater (14) is at least partially re-coupled synchronously or in register with the main drive of the sheet-fed printing machine (10).
2. The method according to Claim 1, characterized in that for the coating form change all cylinders (21, 22) of the respective coater (14) are driven by an auxiliary drive assigned to the coater (14) and that in the production run all cylinders (21, 22) of the respective coater (14) are driven by the main drive of the sheet-fed printing machine (10).
3. The method according to Claim 1, characterized in that for the coating form change all cylinders (21, 22) of the respective coater (14) are driven by a direct drive assigned to the coater (14), and that in the production run the impression cylinder (21) of the respective coater (14) is driven by the main drive of the sheet-fed printing machine (10) and the form cylinder (22) of the respective coater (14) is driven synchronously and in register by the direct drive of the respective coater (14) with its own motor.
4. The method according to any one of the Claims 1 to 3, characterized in that in the production run all cylinders (16 - 18) of the or each printing couple (13) are driven by the main drive of the sheet-fed printing machine (10).
5. The method according to any one of the Claims 1 to 3, characterized in that in the production run the impression cylinder (16) and the transfer cylinder (17) of the or each printing couple (13) are driven by the main drive of the sheet-fed printing machine (10) and the form cylinder (18) of the or each printing couple (13) is driven synchronously or in register by a direct drive of the respective printing couple (13) with its own motor.

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