DE102015208179B4 - Method for aligning plate cylinders and adjusting printing plates in sheet-fed printing machines - Google Patents

Abstract

A method for operating a sheet-fed printing machine with several printing units (1, 2, 3), wherein - the respective printing unit (1, 2, 3) has at least one plate cylinder (4), - a printing forme is clamped on the plate cylinder (4) and - the For this purpose, the plate cylinder (4) is equipped with clamping elements suitable for clamping the printing form and arranged in a clamping channel (5), - for the plate cylinder (4) a rotational angle range of the clamping channel (5) accessible to the operator is stored in a control of the sheet-fed printing machine or this is calculated on the basis of the information stored there and - the printing unit (1, 2, 3) is stopped in such a way that the clamping channel (5) of the plate cylinder (4) comes to a standstill in this angle of rotation range, - a setting of the printing form for register correction of at least one printing unit (1, 2, 3) of the plurality of printing units (1, 2, 3) is carried out at a standstill, - the product produced on the sheet-fed printing machine undergoes a quality control is subjected and then, if at least one quality criterion is not met, the printing unit (1, 2, 3) causing the deviation is identified and the relevant printing unit (1, 2, 3) is stopped so that the clamping channel (5) of the Plate cylinder (4) of the relevant printing unit (1, 2, 3) is located in the rotational angle range accessible to the operator, - access to the clamping channel (5) through a cover (12) in the housing of the printing unit (1, 2, 3) during continuous printing ) is closed, - the cover (12) opens automatically.

Description

The invention relates to a method for aligning plate cylinders and for adjusting printing plates in sheet-fed printing machines according to the features of claim 1.

In such a sheet-processing machine, in particular sheet-fed printing machine, moisture and / or flexing processes cause the printing material to roll out at the ends of the sheets during printing. This rolling increases from one printing unit to the next, so that it is necessary to adapt the printing plates of the individual printing units to the deformations of the sheets in order to achieve register accuracy. For this purpose, the tensioning rail receiving the printing plate end is partially displaced in the circumferential direction and the printing plates are thus expanded in this direction. This is often referred to as stretching the printing plate. For stretching in the axial direction with respect to the plate cylinder, a tensioning rail consisting of several tensioning elements is used, the individual tensioning elements being displaced in the direction of the edges of the printing plate.

During the production run, test sheets are drawn and checked for compliance with the color register. In this way it can be determined at which printing unit the relevant adjustment processes are required.

From the DE 10 2007 057 455 A1 such a solution is known. It is proposed there to equip the printing forme cylinder carrying the printing plate and the transfer cylinder of a printing unit, which is provided with a rubber blanket, with actuators. The actuators are arranged in the cylinder channels and engage the front and rear edges of the printing plate and the blanket. Furthermore, actuators are provided sunk in the lateral area of the cylinder jacket, which act on the side edges of the printing plate or the rubber blanket. The sheet-fed printing machine is assigned a control panel which is provided with an image inspection device which is suitable for the geometrical measurement of the sheet-like printing materials that are to be processed. The image inspection device is connected to the controller and a computer which processes the measurement results of the image inspection device and carries out a target / actual comparison. If deviations from the target value occur during this comparison, the actuators are activated in such a way that the deviations found are minimized or compensated for.

The disadvantage of this solution is the high technical effort.

From the EP 0 534 214 A1 a method and a device for correcting trapezoidal register deviations are known. The rear edge of the printing plate is clamped to at least two sections and a test print is then carried out to determine register deviations. This misregistration is then corrected by pulling the two sections apart in the axial direction. Corresponding devices are available for manually operated plate clamps. These can apply a high clamping force, which is not possible with automatic plate clamping. In order to be able to correct such a misregistration even when the plate is clamped with a lower clamping force, it is proposed here that an additional clamping force be applied to the two subsections before the correction.

The DE 690 22 378 T2 , the DE 195 31 024 A1 , the DE 10 2007 049 453 A1 , the DE 10 2004 039 536 A1 , the DE 10 2012 014 806 A1 , the DE 42 23 583 A1 , the DE 44 07 632 A1 , the DE 600 21 815 T2 , the DE 10 2006 002 087 A1 , the DE 196 40 649 A1 , the DE 38 36 310 A1 and the DE 196 36 703 A1 disclose methods for changing printing plates, in which the plate cylinder is positioned in predetermined angular positions.

The DE 33 42 662 A1 relates to a device on a printing machine, consisting of a plate cylinder and a blanket cylinder, which are driven by a common motor, the plate cylinder or blanket cylinder being provided with clamping devices for clamping printing plates or blankets. Pressing a triggering unit triggers a command to a setpoint memory, which in turn forwards a setpoint to a comparator. In the comparator, the target value is compared with an actual value of the plate cylinder, which comes from an actual cylinder position value transmitter, and a control command is passed on to an engine control unit. The control command is sent from the motor control to a motor which adjusts the blanket cylinder, or via this the plate cylinder, to the position required when the printing plate or blanket is clamped and unclamped during the assembly process.

The DE 36 14 578 A1 relates to a register measuring system for printing plates.

This solution leads to an acceptable result, but requires a lot of time.

The invention is therefore based on the object of creating a method for aligning plate cylinders and for adjusting printing plates in sheet-fed printing machines.

The basis is preferably a simple technical solution in which the time required for manual stretching of the clamped printing plate is significantly reduced. This solution should also be applicable to the retensioning of all types of elevators on cylinders of printing machines.

The object is achieved according to the invention by the features of claim 1.

The invention is explained in more detail below using several exemplary embodiments. The accompanying drawing shows the schematic representation of three printing units as processing units of a sheet-fed printing machine. However, the invention is not limited to three printing units. In addition to these printing units, coating units can also be used as further sheet processing units. Further embodiments of processing units in sheet processing machines can, for. B. processing cylinder for punching or perforating or foiling.

Embodiment

The part of a sheet-fed printing press shown in the drawing shows printing units 1 , 2 , 3 those with direct drive plate cylinders 4th are equipped. As each of the three printing units 1 , 2 , 3 is structured the same, the details are only given below using one of the printing units 1 , 2 , 3 designated and described.

As can be seen in the figure, each of the three printing units 1 , 2 , 3 one plate cylinder each 4th on. On each of the three plate cylinders 4th one printing form (not shown) is clamped on each. Every plate cylinder is used for this purpose 4th with a clamping channel 5 fitted. In the clamping channel 5 suitable clamping elements are arranged for clamping the pressure plate. In particular, there is at least one holding element at the start of printing and at least one holding element at the end of printing in the clamping channel 5 arranged. The at least one holding element at the end of printing can be moved by means of at least one tensioning element.

In the illustrated embodiment, each printing unit 1 , 2 , 3 a plate cylinder 4th on, which has its own drive M. assigned.

An inking unit is used to color the printing plate 6th intended. There is also a dampening system 7th to the plate cylinder 4th employed to maintain the ink / water balance required for printing.

The plate cylinder 4th is a rubber cylinder 8th assigned to the one clamping channel 13 having. In the clamping channel 13 are tensioning elements for tensioning a blanket on the surface of the blanket cylinder 8th intended.

The rubber cylinder 8th has contact with a sheet-guiding impression cylinder 9 . Between the impression cylinders 9 two printing units 1 , 2 , 3 is one sheet-guiding transfer drum each 10 provided through which the sheets of printing unit 1 , 2 , 3 to printing unit 1 , 2 , 3 in sheet transport direction 11 be transported.

The printing units 1 , 2 , 3 a sheet feeder, not shown here, is arranged upstream and a sheet feeder, also not shown, is arranged downstream.

The impression cylinder 9 who have favourited Transfer Drums 10 who have favourited rubber cylinders 8th and preferably the inking units 6th the sheet-fed printing press shown here are driven by at least one main drive. These are the drives M. the plate cylinder 4th synchronously trackable during printing.

At least the impression cylinders 9 who have favourited the transfer drum 10 and the blanket cylinders 8th are driven by at least one main drive by means of a common gear train.

According to the invention, the sheet-fed printing machine is equipped with a control in which for each plate cylinder 4th an angle of rotation range of the clamping channel accessible to the operator 5 is stored in the control. This is to be understood as the angle of rotation range after opening a cover attached to the frame of the sheet-fed printing machine 12 is accessible to the operator so that he can carry out operator actions there.

The at least one tensioning element and / or holding element at the end of the printing is preferably accessible in this rotational angle range.

If the sheet-fed printing machine is equipped with a turning device, then information is stored in the control, on the basis of which the angle of rotation range of the clamping channel accessible to the operator is stored 5 can be calculated.

The method according to the invention is implemented as follows: At the beginning of the print job, the inking rollers are the inking unit 6th from the plate cylinder 4th switched off and the contact between the plate cylinder 4th and the blanket cylinder 8th is canceled (see figure). The rubber cylinder 8th is from the impression cylinder 9 switched off.

The inking rollers of the inking unit are used to process a print job 6th employed and the contact between the plate cylinder 4th , Rubber cylinder 8th and impression cylinder 9 is produced. During this test printing operation, the inked printing plate transfers the printing ink via the rubber cylinder 8th on the one on the impression cylinder 9 guided sheet. In this pressure phase, printed sheets are removed in order to check the register accuracy of at least parts of the printed image. The checking is done visually. In another variant the register deviations are determined by sheet inspection. For this purpose, at least one or more sensors, in particular at least one or more cameras, are provided.

A sensor that detects the registration can in particular be assigned to the printing press and / or a control station of the printing press. With the sensor assigned to the printing press, at least parts of the at least one sheet in the printing press are detected during printing. With the sensor assigned to the control station, at least parts of the at least one sheet lying on the control station from the same job, in particular the one that is currently being printed, are recorded.

When a register discrepancy is detected in the printed image, the sheet-fed printing press is stopped. The sheet travel is usually interrupted. The printing unit affected by the register deviation 1 , 2 , 3 (e.g. the printing unit 1 ), or all affected printing units 1 , 2 , 3 (e.g. the printing units 1 , 2 ) are identified and communicated to the controller.

As an alternative to stopping the entire sheet-fed printing press, the remaining printing units can also be provided 2 , 3 or. 3 to continue running and only the identified printing units 1 or. 1 , 2 to stop.

• In einem ersten Schritt wird die synchrone Nachführung des Plattenzylinders 4 des Druckwerks 1, 2 der Bogendruckmaschine aufgehoben. Nun werden in einem zweiten Schritt die Plattenzylinder 4 so angehalten, dass der Spannkanal 5 des Plattenzylinders 4 der identifizierten Druckwerke 1, 2 in einem für den Bediener zugänglichen Drehwinkelbereich zum Stillstand kommt. Dieser Drehwinkelbereich ist aus der Steuerung bekannt bzw. kann aus den dort hinterlegten Daten berechnet werden. Die Bewegung erfolgt durch den Antrieb M der Plattenzylinder 4.

Stopping the affected printing units 1 , 2 , 3 (e.g. the printing units 1 , 2 ) happens as follows:

• The first step is the synchronous tracking of the plate cylinder 4th of the printing unit 1 , 2 the sheet-fed printing press lifted. Now, in a second step, the plate cylinder 4th stopped so that the clamping channel 5 of the plate cylinder 4th of the identified printing units 1 , 2 comes to a standstill in an angle of rotation range accessible to the operator. This angle of rotation range is known from the control or can be calculated from the data stored there. The drive makes the movement M. the plate cylinder 4th .

In another variant of the invention, the synchronous tracking of all printing units 1 , 2 , 3 interrupted and the sheet-fed press is stopped so that the clamping channels 5 all plate cylinders 4th are in the angle of rotation range accessible to the operator.

After the plate cylinder or cylinders 4th have come to a standstill in the position described above, the cover preferably opens automatically 12 and grants the and / or the operator (s) access to the respective clamping channel 5 . In another variant of the invention, the identified printing unit that has now come to a standstill is used 1 , 2 or printing units 1 , 2 indicated by the signal and the operator must remove the respective cover 12 open yourself. In a further embodiment, the respective cover opens 12 automatically.

He is now able to carry out operator actions there. These actions can consist in particular in carrying out settings for register correction in order to minimize register errors, in particular when the respective plate cylinder is at a standstill 4th , preferably to take actions to eliminate the register deviations, for example the so-called stretching of the printing plate. The clamping elements are in the clamping channel 5 operated in such a way that they are displaced in the circumferential direction to stretch the pressure plate. Moving the clamping elements, starting from the center in the direction of the lateral edges, causes the printing plate to expand axially to the plate cylinder 4th .
The shifting of the clamping elements both in the axial and in the circumferential direction can be done manually using suitable clamping means.

In this case, the respective printing form is preferably stretched in the circumferential direction and / or in the axial direction (based on the plate cylinder).

The sheet-fed printing press can then be returned to production. This is done in such a way that the drives are synchronized M. the plate cylinder 4th to the main drive is restored. The sheet-fed printing machine is brought to production speed and the printing is started.

Access to the clamping channel is during production 5 through a cover 12 in the housing of the printing unit 1 , 2 , 3 closed.

During the production run, test prints are taken at fixed intervals or the quality of the production run is monitored using an image inspection camera. If register deviations are found during production, these can now be eliminated using the procedure described above.

After a print job has been processed, the clamping elements are returned to their Initial position spent. This is done so that the printing units 1 , 2 , 3 be stopped so that the clamping channel 5 of the plate cylinder 4th comes to a standstill in an angle of rotation range accessible to the operator and there the operator can carry out the necessary operator actions.

Embodiment

The method according to the invention can also be applied to sheet-fed printing machines in which the plate cylinder 4th are driven by the main drive of the sheet-fed printing machine during production and by an auxiliary drive outside of production.

The procedure is implemented as follows: When a register discrepancy is detected in the print image, the plate cylinders are 4th , in which such an event was detected, decoupled from the main drive and coupled to the associated auxiliary drive.

With the help of the auxiliary drives, the relevant printing units will be 1 , 2 , 3 now stopped so that the plate cylinder 4th of the relevant printing units 1 , 2 , 3 be brought into a position in which the clamping channels 5 are in the angle of rotation range accessible to the operator. The ones in the clamping channels 5 arranged clamping elements are operated by the operator in the manner described above. Once the causes of the register deviation have been eliminated, the sheet-fed printing press can be switched back to production. The plate cylinder 4th again decoupled from the auxiliary drive and coupled to the main drive.

Embodiment

The method according to the invention can also be used on conventional sheet-fed printing machines. This is to be understood as meaning sheet-fed printing machines in which the plate cylinder 4th are driven by the main drive of the sheet-fed printing machine during production and also for performing auxiliary processes.

The method is implemented, for example, as follows: When a register discrepancy is detected in the print image, the sheet-fed printing press is stopped. This is done in such a way that at least one of the printing units 1 , 2 , 3 , in which a register discrepancy was found in the print image, the plate cylinder 4th comes to a standstill that its clamping channel 5 and / or clamping channel 13 of the blanket cylinder 8th is located in a rotation angle range accessible to the operator. The cover 12 opens and the operator can carry out the required operator actions.

Multiple plate cylinders 4th are selected and communicated to the controller. From these selected plate cylinders 4th or printing works 1 , 2 , 3 becomes the last plate cylinder selected in relation to the sheet travel direction 4th positioned, ie the plate cylinder 4th which is closest to the sheet delivery. This preferably comes to a standstill in the angle of rotation range accessible to the operator.

It can be the covers 12 of all selected plate cylinders 4th before or after positioning the plate cylinder 4th , preferably open automatically at the same time.

Sheet-fed printing machines are designed in such a way that, as a rule, with two or more printing units, the plate cylinder 4th (in particular alternating in pairs) have a corresponding angle of rotation position, also referred to as phase position. In other words, there are typically at least two plate cylinders 4th or rubber cylinder 8th , whose clamping channel 5 have the same angle of rotation when the sheet-fed printing machine is at a standstill. In the figure this applies to the printing units 1 and 3 to. Therefore, the coverage will also change in both cases 12 open so that operator actions can be carried out on both printing units if required.

After completion of the work, the operator sends a completion message to the control. This is preferably done in such a way that the cover is closed 12 represents this completion notification. The completion notification can also take the form of pressing a button.

After the completion notification, the control system asks whether there are any further printing units 1 , 2 , 3 are available for which an operator action is required and for which the clamping channel 5 , 13 was not yet accessible for operator actions.

If this is not the case, the sheet-fed printing press can be switched back to production.

In the event that there are other identified printing units 1 , 2 , 3 were recognized, which require an operator action and where the clamping channel 5 was not yet accessible for operator actions, the sheet-fed printing press is transferred to a further position or to a further phase position. The clamping channel is also in this further position 5 in an angle of rotation range accessible to the operator. After the operator actions, it becomes the last plate cylinder selected 4th upstream plate cylinder 4th positioned in the rotation angle range accessible to the operator. After the necessary work has been carried out, a completion report is generated again. Should further affected printing units 1 , 2 , 3 are recognized, the mode is repeated until there is no longer any need for action.

At least one, in particular a preselected, machining cylinder is preferred 4th , 8th or several, in particular all, processing cylinders 4th , 8th positioned due to the triggering of a stop signal (as a result of a sequence stored in a controller). In particular, all are plate cylinders 4th of all printing units 1 , 2 , 3 when the sheet-guiding cylinder comes to a standstill 9 and / or drums 10 simultaneously positioned in the area accessible to the operator. In particular, the aforementioned sequences or parts of the sequences are carried out by a controller by triggering a stop signal.

This stop signal causes at least a standstill of the sheet-transporting cylinder. As a result of this stop signal, the sheet-guiding cylinders are preferably stopped before the standstill 9 and / or drums 10 at least the sheets from in the sheet transport direction 11 seen first impression cylinder 9 removed up to a bow boom. There is preferably no sheet held by grippers, at least from the first impression cylinder 9 up to a sheet delivery in the printing press, in particular when the sheet-guiding cylinders (e.g. impression cylinder) 9 and / or drums (e.g. transfer drum) 10 are at a standstill as a result of triggering a stop signal.

Preferably, all of the plate cylinders are deactivated for all stop signals (with the exception of emergency stop) (stored in the controller), in particular with stop signals associated with program sequences 4th the sheet-fed printing machine is stopped in the angle of rotation range accessible to the operator.

In particular, the cover 12 before stopping, especially when the processing cylinder is at a standstill 4th , 8th automatically open in the rotation angle range accessible to the operator as a result of the control.

The signals can be triggered by units or from the control station of the printing press.

List of reference symbols

1

Printing unit

2

Printing unit

3

Printing unit

4th

Plate cylinder

5

Clamping channel

6th

Inking unit

7th

Dampening system

8th

Rubber cylinder

9

Impression cylinder

10

Transfer drum

11

Sheet transport direction

12

cover

13

Clamping channel

M.

drive

Claims (26)

Method for operating a sheet-fed printing press with several printing units (1, 2, 3), wherein - the respective printing unit (1, 2, 3) has at least one plate cylinder (4), - A printing form is clamped on the plate cylinder (4) and - For this purpose, the plate cylinder (4) is equipped with clamping elements which are suitable for clamping the printing form and are arranged in a clamping channel (5), - For the plate cylinder (4), a rotational angle range of the clamping channel (5) accessible to the operator is stored in a control of the sheet-fed printing press or - this is calculated on the basis of the information stored there and - the printing unit (1, 2, 3) is stopped in such a way that the clamping channel (5) of the plate cylinder (4) comes to a standstill in this rotational angle range, - an adjustment of the printing form for register correction of at least one printing unit (1, 2, 3) of the several printing units (1, 2, 3) is carried out at a standstill, - The product produced on the sheet-fed printing press is subjected to a quality control and, if at least one quality criterion is not met, the printing unit (1, 2, 3) causing the deviation is identified and the relevant printing unit (1, 2, 3) is stopped in this way that the clamping channel (5) of the plate cylinder (4) of the relevant printing unit (1, 2, 3) is in the angle of rotation range accessible to the operator, - The access to the clamping channel (5) is closed by a cover (12) in the housing of the printing unit (1, 2, 3) during production, - the cover (12) opens automatically. Procedure according to Claim 1 , characterized in that the printing form is stretched in the circumferential direction and / or in the axial direction for register correction. Procedure according to Claim 1 , characterized in that all plate cylinders (4) of the printing units (1, 2, 3) in the rotational angle range accessible to the operator as a result of triggering a stop signal at least for sheet-leading Cylinders (9) and / or drums (10) are stopped by the control and that all plate cylinders (4) of all printing units (1, 2, 3) are in the area accessible to the operator when the sheet-guiding cylinders (09) and / or Drums (10) are positioned at the same time. Procedure according to Claim 3 , characterized in that after triggering the stop signal at least all sheets are removed from the sheet-guiding cylinders (9) and / or drums (10) and then all plate cylinders (4) are stopped in the rotation angle range accessible to the operator. Procedure according to Claim 1 , characterized in that at least one device for turning the sheet is provided between the printing units (1, 2, 3). Procedure according to Claim 1 , characterized in that the cover (12) opens when the clamping channel (5) comes to a standstill in the intended angle of rotation range. Procedure according to Claim 1 , characterized in that - the respective printing unit (1, 2, 3) has a plate cylinder (4), which is assigned its own drive (M) that can be synchronously tracked to a main drive of the sheet-fed printing machine, wherein - the printing unit (1, 2, 3 ) is stopped in such a way that in a first step the synchronous tracking of the plate cylinder (4) is canceled and - in a second step the plate cylinder (4) is brought to a halt in the rotation angle range accessible to the operator, - the necessary settings for register correction in Clamping channel (5,) are made and - then the synchronous tracking is restored. Procedure according to Claim 1 , characterized in that - the respective printing unit (1, 2, 3) has a plate cylinder (4) which is driven in a first operating mode by the main drive of the sheet-fed printing press and in a second operating mode by an auxiliary drive, wherein - the respective printing unit ( 1, 2, 3) is stopped in such a way that the plate cylinder (4) is decoupled from the main drive and coupled to the auxiliary drive of the plate cylinder (4) and - the auxiliary drive brings the plate cylinder (4) into a position in which the clamping channel (5 ) is in the rotation angle range accessible to the operator, - the necessary settings for register correction are made in the clamping channel (5), - then the plate cylinder (4) is decoupled from the auxiliary drive and - is coupled to the main drive. Procedure according to Claim 1 , 7th or 8th , characterized in that the sheet-fed printing machine has at least four printing units (1, 2, 3), and that the sheet-fed printing machine is stopped so that the clamping channels (5) of all plate cylinders (4) of the printing units (1, 2, 3) are simultaneously in the angle of rotation range accessible to the operator. Procedure according to Claim 1 , characterized in that - the plate cylinders (4) are continuously driven by the main drive of the sheet-fed printing machine and - the sheet-fed printing machine is stopped in a position in which the clamping channel (5,) of at least one plate cylinder (4) is in the rotational angle range accessible to the operator - the necessary settings for register correction are made in the clamping channel (5). Procedure according to Claim 1 , 2 , 7th , 8th , 9 or 10 , characterized in that after the register correction has been set, a completion report is transmitted to the controller. Procedure according to Claim 11 , characterized in that the closing of the cover (12) is transmitted to the control as a completion message after the register correction has been set. Procedure according to Claim 11 , characterized in that the notification of completion takes place in the form of pressing a button. Procedure according to Claim 11 or 12 , characterized in that, after the completion notification, the control system asks whether there are any further printing units (1, 2, 3) which require a setting for register correction and for which the clamping channel (5) is not yet available for settings for register correction was accessible. Procedure according to Claim 14 , characterized in that when no further such settings for register correction are recognized, the sheet-fed printing press is started up. Procedure according to Claim 14 , characterized in that when at least one other such printing unit (1, 2, 3) is detected, the sheet-fed printing press is stopped in the rotational angle range of the clamping channel (5) of another printing unit (1, 2, 3) accessible to the operator, the necessary settings for Register correction in the clamping channel (5) can be made and a completion message is sent to the control. Procedure according to Claim 1 , characterized in that the identified printing unit (1, 2, 3) is displayed using signals. Procedure according to Claim 1 , characterized in that the register is checked while a print job is being carried out. Procedure according to Claim 18 , characterized in that the register deviation is determined visually on the basis of a sample sheet taken during production. Procedure according to Claim 18 , characterized in that the register deviation is determined by sheet inspection during production. Procedure according to Claim 18 , 19th or 20th , characterized in that, in order to eliminate the register deviation, the clamping elements for stretching the printing form are displaced in the circumferential direction of the plate cylinder (4). Procedure according to Claim 18 , 19th or 20th , characterized in that to eliminate the register deviation for stretching the printing form, the clamping elements are shifted axially to the plate cylinder (4) in the direction of the lateral edges of the printing form. Procedure according to Claim 18 , 19th or 20th , characterized in that the clamping elements in the clamping channel (5) are shifted manually using suitable clamping means. Method according to the preceding claims, characterized in that the necessary settings for register correction in the clamping channel (5) are made in preparation for an order to be carried out on the sheet-fed printing machine. Method according to the preceding claims, characterized in that the necessary settings for register correction in the clamping channel (5) are made in the course of interruptions in the processing of an order to be carried out on a sheet-fed printing press. Method according to the preceding claims, characterized in that after an order has been processed, the clamping elements are returned to their starting position in such a way that the at least one printing unit (1, 2, 3) is stopped so that the clamping channel (5) of the plate cylinder (4) comes to a standstill in a rotational angle range accessible to the operator and there the operator can make the necessary settings for register correction.

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