DE10338973A1 - Detecting interruption in material web transport by sensor unit monitoring print-to-cut registration marks and providing alarm signal if predetermined threshold values are overstepped - Google Patents

Abstract

Print-to-cut registration marks (38) are monitored by sensor unit (40) e.g. CCD camera or CCD sensor connected to processing unit (44). Unit (44) is connected to encoder (52) for position and/or speed of cutter (22) and sheet catch unit (10). Processing unit has threshold value in memory (48) and provides warning signals to activate catch unit (10) and deactivate drive (58), if obstruction occurs. Independent claims included for: 1) Device to detect interruption of web transport 2) Rotary printing machine 3) Use of device to monitor print to cut register of rotary printing machine

Description

The invention relates to a method and a device for fault detection when transporting a material web in a material web Machine according to the generic term of claim 1 and claim 8.

The invention further relates to a process to avoid product loss and / or product jam in a folder of a rotary printing press according to the preamble of claims 4 and 5.

The invention further relates to the Use a device to monitor the print-to-cut register a web-fed rotary printing press according to the preamble of claim 12th

In web-fed rotary printing machines, For example, in web-fed rotary offset presses, a web of material is commonly used unwound from a supply roll in a roll changer, by passed through several printing units, which print the material web on both sides and in multiple colors, passed through a dryer, to solvent to evaporate the printing ink, as well as around cooling rolls of a cooling roll stand guided, whereby the heated ink hardens again and then to Further processing fed to a folder in which the material web along- and cross-cut and longitudinal and can be folded to print and folded signatures to create.

The run of the material web through the different components of the rotary printing press is used in conventional Way constantly monitors what It is ensured that irregularities in the web run early recognized and in particular a web break, which leads to damage of the various components of the printing press can be prevented can.

A web break or web break often happens in the area of the dryer and causes the upstream section the torn web of a blanket cylinder from the last one Printing unit entrained by the adhesive effect of the printing ink and is wound up on the cylinder, causing serious damage lead on this printing unit can. The downstream The end of the torn web of material can be pulled into the folder and also cause damage there.

There is also the risk that by a drop in web tension in a web break in a punctual one Folder in which the signatures are held by grippers the grasping of the respective signatures is no longer in the desired Way is done. When the web tension is reduced, the signatures not exact and complete at the front edge, but only partially through the gripper closure taken. As a result, further transport in the folder can occur remove a signature from the gripper closure and cause a blockage of the transport path in the folder, whereby this through the unwanted Accumulation of the following signatures suffer considerable damage can.

To prevent such damage are Monitoring measures from the prior art known, which are presented below.

From the DE 198 27 190 A1 A method and a device for monitoring a material web is known, wherein a value of a web tension of the material web is determined, a change in the web tension per unit time is evaluated and a signal is output on the basis of this change. On the basis of this signal, a web break can be detected and, for example, an actuatable switching device can be controlled. The web tension can be determined, for example, with a measuring roller as a detector, so that excessive deflection of the measuring roller and the data derived therefrom can be used for the indication of a tear in the material web.

It is still out of the US 5,810,235 a method for detecting faults in the transport of a paper web in a printing press has become known, for example using an optical or ultrasound sensor to monitor the web speed of the material web to be transported and to compare the changes in the web speed with a predetermined threshold value and, if the threshold value is exceeded, a Web safety device can be activated.

It is also from the DE 101 29 889 A1 Known to detect a web break, the web speed by means of several microwave detectors, which are arranged at different points along the material web path and to undergo a threshold value comparison.

Furthermore, methods and devices become known, which to prevent a product jam, Example can be used in a folder.

From the US 5,346,202 A method for monitoring the transport of printed products in a machine processing printed products is known, a product stream being carried out by comparing the position of the respective front and rear edges of a product with predetermined zones. If the edges do not come to rest in the specified zones, a machine stop can be triggered.

From the EP 0 933 321 A2 is also known a folder with early warning system for detecting jams and a method used for this, the front and rear edges of printed signatures in a folder are monitored by several sensors along the transport path within the folder. It is checked whether the leading edge and / or the trailing edge of the signature deviate from the path edge by more than a certain tolerance range.

It is still out of the EP 1 086 918 A2 a method and an apparatus for recognizing a product jam in a folder are known, sensors being assigned to a copy transport path which detect the sequence of fold copies along the copy transport path and possibly generate a counting pulse which is fed to a paper jam detection.

In web-fed rotary printing presses becomes a completely other than the above-mentioned purpose of preventing web breaks or detection, usually also monitors the print-to-cut register, which ensures that the cross cutting of the material web in the folder with the location of the printed images it is agreed that the cut is perpendicular to the material web on a Place takes place, which is preferably printed between successive Print images lies.

A printed register mark can be used for this detected with a sensor unit and a characteristic or descriptive size for the register forwarded to a computing unit and the angular position of a Cutting cylinder also recorded and also a characteristic of this Size to the Computing unit are forwarded, which one of these values characteristic or descriptive size for the print-to-cut register determined and this if necessary in the event of a deviation from a predetermined value for this Register adjusts, for example by adjusting the cutting cylinder or the position of the printed images on the material web changed becomes. Such a change of location can by rotating the pressure cylinder relative to the web or to Example by deflecting a dancer roller be achieved.

Such a method and a device for maintaining the pressure-to-cut register is known from the US 5,568,767 known. A scanner in the infeed area of a folding former detects the relative position of a printed image on the web, while an encoder detects the angular position of a cutting cylinder and generates synchronization information, the data from the scanner and the encoder being fed to a scanner controller and subsequently to a control computer. The control computer generates a position control data stream, that is to say a register error data stream, a speed control data stream and a torque control data stream, which are fed to a drive motor control of the drive motor of the cutting cylinder. For fast control of the drive motor and for rapid regulation of the print-to-cut register, not only the cut register itself, but also its first and second time derivatives, that is to say the speed and acceleration, are used in the control of the drive motor.

It is a task of the present Invention, a method and an apparatus for fault detection when transporting a material web in a material web Creating machine.

It is another or alternative Object of the present invention, a method and an apparatus for fault detection when transporting a material web in a material web Create machine, taking a possible web break early is recognized and prevented.

It is another or alternative Object of the present invention, an inexpensive method and inexpensive Fault detection device when transporting a material web in a material web Creating machine.

It is another or alternative Object of the present invention a method for avoiding product loss and / or product jam in a folder to create, which in particular early detection and thus Prevents potential damage to the folder.

These tasks are accomplished by the invention the features of claims 1, 4, 5, 8 and 12 solved.

Other features of the invention are in the subclaims contain.

• – Bestimmung und Überwachung wenigstens des Druck-zu-Schnitt-Registers; und
• – Erzeugung eines Störsignals bei Überschreiten eines vorgegebenen Schwellwertes aus.

A method according to the invention for detecting faults during the transport of a material web in a machine processing material web, wherein a quantity characterizing the web transport is determined and monitored by means of at least one sensor unit and a computing unit interacting with it, is characterized by the method steps

• - Determination and monitoring of at least the print-to-cut register; and
• - Generation of an interference signal when a predetermined threshold value is exceeded.

The method according to the invention advantageously uses Way the change the print-to-cut register, which are in the event of disturbances in the Web run result from a possible or potential, the disturbances to recognize or detect and prevent the following web break. For example, lead Web tension changes and / or Web speed changes also about changes in the print-to-cut register.

According to the Bestim mation and monitoring of at least the print-to-cut register a reliable, highly precise and responsive method is provided, which generates an interference signal by a simple threshold value comparison. Deviations in the print-to-cut register are quickly detected by the sensor unit and further processed in the computing unit, so that a characteristic quantity for the rail transport can advantageously be obtained from monitoring the values of the print-to-cut register. The print-to-cut register can itself represent this characteristic quantity and the time course of its values can be analyzed in the computing unit. If a specified threshold value is exceeded or undershot (the undershoot is to be understood in this context as an overshoot in the negative direction of the value axis) or also if a predefined maximum or minimum deviation from a predefined setpoint value is exceeded (which in this context also means exceeding a predefined value Threshold value is to be understood), an appropriate emergency measure can be initiated in a simple manner by generating an interference signal as an indicator of an interference in the transport of the material web.

It is also advantageously possible temporal course of the print-to-cut register itself and / or to monitor its first and / or its second time derivative and undergo the threshold comparison. Through the alternative or additional surveillance the course and / or the derivations of this course becomes the reaction time fault detection significantly reduced in an advantageous manner, because of upcoming values can be extrapolated.

In a further embodiment of the invention be provided for monitoring at least the print-to-cut register at least one register information carrier, in particular a printed register mark and / or at least a section of the Print image is recorded by a CCD unit.

For example, it is not possible only specially printed register marks, but also the printed image itself or at least a portion of the printed image for the determination to determine the print-to-cut register in its register position and monitor why a CCD unit, for example a CCD camera, if necessary in the inlet area of the folder, a former or one Turning bar superstructure of a folder, can be used in an advantageous manner can.

A method according to the invention is also distinguished to avoid product loss and / or product jam in one Folder of a web-fed rotary printing press characterized in that by means of at least one sensor unit and one interacting with it Computing unit the web tension or the web speed of a Material web determined and monitored will, and that when exceeded a predetermined threshold value at least one web cutting device and / or Web catching device of the folder in a section in front of the first folding cylinder is activated.

It is also in this context possible, the time course of the web tension or web speed itself and / or the first and / or the second time derivative to monitor and preferably a threshold comparison.

The web tension can be determined for example, by using a dancer roller. The web speed can by a speed sensor arranged in the course of the path, which z. B. uses the Doppler effect, or one on a pull roller arranged sensor or encoder can be determined.

The activation of a web cutting device according to the invention and / or a web catching device of the folder in one section before the first folding cylinder advantageously avoiding product loss and / or a product jam in the folder because the product flow to the first and possibly further folding cylinders can be interrupted.

Another advantage of the method according to the invention results from the fact that the arrangement of the web cutting device and / or the web catching device an interruption of the material web or the product flow in the folder or immediately before Folding device happens so that the web path from the reel changer through all Printing units, the dryer, the chill roll stand as also by a possibly existing turning bar superstructure of the Folder is preserved and an expensive and time-consuming reintroduction the material web can be avoided.

The threshold can be empirical, for example can be determined in such a way that the relevant emergency measure for example cutting and catching the material web in the Infeed area of the folder, is initiated as soon as the danger there is cross-cut signatures in the folder due to the changed Web tension can no longer be gripped safely, even if the immediate Danger of a web break, for example in the area of the dryer, still does not exist. This can prevents damage to the folder in a simple and effective manner and a quick restart of the machine is guaranteed become.

In addition, it is also advantageously possible to use the predetermined threshold value as a function of the operating parameters of the machine and / or the material properties of the material web to change the setting and / or to design it changeable during operation of the machine.

As the operating parameters of the machine can for Example of the operating mode of the machine such as start-up, Acceleration or braking phase can be viewed. As a material property of Web can for example be the paper web thickness, its modulus of elasticity, the degree of dampness, the area coverage or the web width can also be used. In principle, too any other parameter that affects the print-to-cut register has to be used to adjust the threshold value.

The interference signal can also stop the machine or module stop, especially a folder stop and / or at least one web separating device and / or one web catching device activate.

A device according to the invention for fault detection when transporting a material web in a material web Machine, the device comprising at least one sensor unit and one with this interacting computing unit for determination and monitoring a size that characterizes rail transport is characterized by this from that the sensor unit for monitoring at least the print-to-cut register is and that the computing unit for storing a predetermined Threshold value is designed, the computing unit when the Threshold value at least one interference signal generated.

With the device according to the invention there are advantages, as already mentioned above with regard to the method according to the invention have been described.

It can also be provided that the sensor unit is designed as a CCD unit.

It is also advantageous to have a Provide web cutting device which can be activated by the interference signal and which is especially after a last printing unit or in Area between the former and the first cylinder of a folder Machine is arranged.

In the sense of the invention is also the Use a device to monitor the print-to-cut register a web-fed rotary printing press, which has at least one sensor unit and a computing unit interacting with this for determination of the print-to-cut register, in a multifunctional manner to look at, whereby both the print-to-cut register is regulated, as well as the print-to-cut register on exceeding a predetermined one Threshold values for fault detection is monitored when transporting a material web.

The invention is described below Reference to the drawings based on preferred embodiments described.

The figures show:

1 1 shows a schematic side view of a web-fed rotary printing press with a horizontal web guide with a device for detecting faults,

2 1 shows a schematic view of a device for fault detection according to the invention,

3 a flowchart of the method steps of the inventive method for fault detection.

1 shows schematically the side view of a web-fed rotary printing press 1 , which is used for example in commercial printing, through which a material web 2 , for example a paper web, is guided horizontally. The web of material 2 is from a supply roll 4 in a reel changer 6 , which can be provided for the flying roll change, processed and then by printing units 8a - 8d out, which print the material web on both sides and in multiple colors. Furthermore, the material web 2 through a web safety device 10 , a hot air levitation dryer 12 and a chill roll stand 14 performed before the printed, dried and cooled material web 2 a folder 16 for the production of folded printed copies, for example signatures. The web-fed rotary printing press 1 is controlled by a control unit 18 controlled, which via data connections, not shown, with the individual components of the machine 1 is connected and can be arranged for example in a control panel.

The folder 16 has a former 20 , at least one cross cutting roller 22 and at least one folding cylinder 24 on. The printed material web 2 or several printed and overlapping material webs become the former 20 , for example from a folder superstructure or a turning bar deck, which provides the at least one material web in the area of the former with a longitudinal fold and the transverse cutting roller 22 for generating signatures.

Furthermore, the web-fed rotary printing press 1 a device 26 for the detection of faults when transporting a material web which, as in 1 shown near the infeed area of the former 20 can be arranged.

The device according to the invention 26 is further referring to 2 explained in more detail.

2 shows one with printed images 28 provided material web 2 , which first has an infeed roller 30 of the former 20 guided and by this over the folding judge 20 on to the cutting roller 22 running. Furthermore, in 2 the web safety device 10 shown which a web separator 32 in the form of a tee knife and a collecting container 34 for the severed web of material. The web catching device can be at any positions along the machine 1 , for example as in 1 shown after the last printing unit.

The printed image applied to the web 28 has a length L, which is determined by the distance between the front and rear edges 36a and 36b of the printed image 28 results.

There is also a register mark on the material web 38 printed to determine the print-to-cut register. This register mark 38 can from a sensor unit 40 , for example a CCD sensor unit or a CCD camera, are recorded, recorded or monitored. The sensor unit stands for this 40 over a data line 42 with a computing unit 44 in connection. The computing unit 44 includes a PLC unit (programmable logic controller) 46 and a storage unit 48 and can be designed, for example, as a conventional control and / or regulation computer. The unit 44 is also on a data line 50 with an encoder 52 in connection which the position and / or the speed of the cutting roller 22 in the usual way spatially and temporally recorded and sent to the unit 44 forwards. The unit is on the output side 44 over a data line 54 with the web safety device 10 in connection and can activate this via an interference signal, so that the material web 2 from the web separator 32 severed as quickly as possible, possibly caught by web-catching rollers, not shown, and the collecting container 34 is fed, in particular avoiding that the torn web of material in components of the printing press, such as the last printing unit 8d or the folder 16 is drawn in.

The device also stands 44 on the output side via a data line 56 with a drive unit 58 , for example a drive motor, in connection which at least the cutting roller 22 drives, but possibly also other rollers or cylinders of the folder 16 ,

The system from printed register mark 38 , Sensor unit 40 , Cutting roller 22 , Encoder 52 and arithmetic unit 44 can represent at least part of a conventional print-to-cut register control and can also be used for print-to-cut register control.

The mode of operation of such a regulation is known to the person skilled in the art and will only be briefly explained here. The successively printed images 28 on the material web 2 have a longitudinal distance from each other in which the material web 2 through the cutting roller 22 , for example, is cut by a cutting knife attached to the cutting roller and runs transversely to the material web and divided into signatures. The pressure-to-cut control ensures that through the cutting roller 22 cross section of the material web 2 always in the unprinted section between the printed images 28 comes to rest. This is done with the sensor unit 40 the registration mark 38 recorded in space and time and in unity 44 with those from the encoder 52 delivered data compared. The comparison reveals that the angular position and / or speed of the cutting roller 22 is currently not such that the material web 2 exactly between the printed images 28 would be severed, so the unity 44 the angular position and / or speed of the cutting roller 22 and / or the longitudinal position of the printed image 28 on the train 2 change or readjust until a desired cross-section of the material web 2 is achieved. The longitudinal shifting of the printed image 28 along the material web 2 can be achieved either by readjusting the angular position of the printing cylinders or also usually by means of a deflectable dancer roller.

The method according to the invention for detecting faults during the transport of a material web in a machine processing material web at least determines the print-to-cut register in the manner just described and subjects the data obtained in this way to monitoring in the unit 46 , When a predetermined threshold value is exceeded, which, for example, in the storage unit 48 the unit creates 44 an interference signal, which over the data lines 54 and 56 both the web catching device 10 activated as well as the drive 58 disabled. Furthermore, the interference signal can be sent to other components of the printing press 1 trigger an emergency stop or initiate a complete machine stop and thereby damage due to the torn material web 2 prevent on the components or the machine.

Monitoring the print-to-cut register in the unit 44 respectively. 46 can, for example, monitor the time course of the print-to-cut register and, in the event that a value characterizing the print-to-cut register, for example the longitudinal position of the register mark along the web 2 relative to the angular position of the cutting cylinder 22 to the train 2 , exceeds a predetermined threshold, initiate the emergency measures described.

It is also possible that the unit 44 alternatively or additionally, the first and / or the second time derivative of the time course of the pressure-to-cut register is monitored and these values are also compared with a respective threshold and, if necessary, the necessary emergency measures are initiated.

For the skilled person is aware that with exceeding a predetermined Threshold also exceeding in the negative direction with respect to the value axis, i.e. falling short a predetermined threshold value can be meant.

Furthermore, monitoring for exceeding or falling below a predetermined deviation from a predetermined target value can be provided hen.

With the help of the sensor unit 40 , for example a CCD camera, can additionally or alternatively also the printed image 28 or a part or section of this printed image can be detected. This makes it possible to use the captured image area (in whole or in part) to determine the print-to-cut register.

It can preferably be an area of the printed image 28 can be compared with a stored pattern for position detection. Common processing mechanisms or algorithms of digital image processing, for example correlation methods, can be used for this. If the pattern was recognized in the image and the position was recorded, a value for the print-to-cut register can be determined from the data obtained in this way.

Furthermore, a register information carrier for Example of a brand that comes to rest in the printed image. The information carrier for the Readers of the printed product arranged in a non-disturbing manner and / or be unrecognizable. The location of the information carrier is conceivable in a printed photo or graphic.

3 shows a process flow for a method for fault detection according to the invention, in a first step 100 a characteristic value for the longitudinal register, in a second step 101 a characteristic value for the cut register and in a third step 102 a characteristic value for the pressure -to-cut register is determined. In a subsequent step 103, the characteristic value of the print-to-cut register is subjected to monitoring, with for example the time profile and / or the first and / or the second time derivative of this profile of the print-to-cut register being monitored and subjected to a threshold comparison. In a further step 104, when a threshold value is exceeded in this way, a machine stop is triggered and / or a web guiding device is activated. Alternatively, if the threshold value is not exceeded after step 104, the determination of the characteristic values is started again in step 100.

To carry out the method according to the invention to avoid product loss and / or product jam in the folder 16 the web-fed rotary printing press 1 can be a web tension measuring device as a sensor unit 60 (please refer 2 ) be provided. The web tension measuring device 60 comprises a deflectable dancer roller, the deflection of which from a rest position represents a measure of the web tension. The measuring device 60 stands over a data line 61 with the computing unit 44 in connection, so that the time course of the web tension of the computing unit 44 is available for analysis. In the storage unit 48 the computing unit 44 a predetermined threshold value is stored and a comparison / evaluation unit (not shown) of the computing unit 44 determines whether the web tension or the first and / or the second derivative of the web tension of the predetermined threshold value is exceeded.

Alternatively or in addition to the tension measurement, a web speed sensor can be used, for example on the axis of the roller 30 can be arranged, the roller 30 can be designed as a driven pull roller, the web speed can be recorded and monitored in a similar manner, ie by comparing threshold values, such as the web tension to avoid product loss and / or product jam in the folder. The threshold value comparison can take place with the current, measured speed value, an integrated or an average value. Furthermore, a lower threshold can additionally be provided, although if the tensioning roller speed is exceeded, it is set, but there is no emergency stop or the like.

If the threshold value is exceeded, a web cutting device and / or web catching device is activated 132 over a data line 62 activated so that the product flow before the first folding cylinder equipped with grippers 24 of the folder 16 is interrupted. The web catching or cutting device 132 can like in 2 shown below the former, but also above the former, for example in front of the infeed roller 30 be arranged. Additional emergency measures, for example a machine stop of the folder or the entire web-fed rotary printing press, can also be initiated.

This in 2 shown system from sensor unit 40 and arithmetic unit 44 can be used multifunctionally according to the invention, that is, on the one hand, this system can monitor and regulate the print-to-cut register, on the other hand, the same system can also, however, the print-to-cut register if a limit value is exceeded. If the system is used multifunctionally an additional web tension measuring device is advantageously dispensed with.

1

Rotary press

2

web

4

supply roll

6

reelstands

8a-8d

printing units

10

Web catching device

12

dryer

14

Chill stand

16

folding

18

control unit

20

formers

22

cutting roller

24

folding cylinder

26

contraption for fault detection

28

print image

30

inlet roller

32

Web severing device

34

receptacle

36a

leading edge of the printed image

36b

trailing edge of the printed image

38

registration mark

40

sensor unit

42

data line

44

computer unit

46

PLC unit

48

storage unit

50

data line

52

encoder

54

data line

56

data line

58

drive unit

60

Web tension measuring device

61

data line

62

data line

100

step

101

step

102

step

103

step

104

step

132

Web severing device

L

Length of print image

Claims (12)

Method for detecting faults during the transport of a material web in a machine processing material web, wherein at least one sensor unit ( 40 ) and a computing unit interacting with this ( 44 ) a quantity characterizing the rail transport is determined and monitored, characterized by the method steps: - determination and monitoring of at least the print-to-cut register; and - generation of an interference signal when a predetermined threshold value is exceeded. A method according to claim 1, characterized in that at least the time course of the print-to-cut register, in particular its first and / or second time derivative, monitored and is subjected to a threshold value comparison. Method according to one of the preceding claims, characterized in that for monitoring at least the print-to-cut register at least one register information carrier, in particular a printed register mark ( 38 ) and / or at least a section of the printed image, from a CCD unit ( 40 ) is recorded. Method for avoiding product loss and / or product jams in a folder of a web-fed rotary printing press, characterized in that - by means of at least one sensor unit ( 60 ) and a computing unit interacting with this ( 44 ) the web tension of a material web ( 2 ) is determined and monitored, and - that when a predetermined threshold value is exceeded, at least one web cutting device and / or web catching device ( 132 ) of the folder in a section in front of the first folder ( 24 ) is activated. Method for avoiding product loss and / or product jams in a folder of a web-fed rotary printing press, characterized in that - by means of at least one sensor unit ( 60 ) and a computing unit interacting with this ( 44 ) the web speed of a material web ( 2 ) is determined and monitored, and - that if a predetermined rapid value is exceeded, at least one web cutting device and / or web catching device ( 132 ) of the folder in a section in front of the first folder ( 24 ) is activated. Method according to one of the preceding claims, characterized in that the predetermined threshold value as a function of operating parameters of the machine ( 1 ) and / or material properties of the material web ( 2 ) can be changed during presetting and / or during operation. Method according to one of the preceding claims, characterized in that the interference signal initiates a machine stop, in particular a folder stop, and / or at least one web catching device ( 10 ) and / or a web cutting device ( 32 . 132 ) activated. Device for detecting faults when transporting a material web in a machine processing material web, the device comprising at least one sensor unit ( 40 ) and a computing unit interacting with it ( 44 ) to the determ Measurement and monitoring of a variable characterizing the rail transport, characterized in that the sensor unit ( 40 ) is designed to monitor at least the print-to-cut register, and that the computing unit ( 44 ) is designed to store a predetermined threshold value, the computing unit ( 44 ) generates at least one interference signal when the threshold value is exceeded. Apparatus according to claim 8, characterized in that the sensor unit as a CCD unit ( 40 ) is designed. Apparatus according to claim 8 or 9, characterized in that a web cutting device ( 32 . 132 ) is provided which can be activated by the interference signal and which is arranged in particular after a last printing unit or in the area between the former and the first folding cylinder of a folder of the machine. Web-fed rotary printing machine, characterized by a device according to one of claims 8 to 10. Use of a device for monitoring the print-to-cut register of a web-fed rotary printing press, which device has at least one sensor unit ( 40 ) and a computing unit interacting with it ( 44 ) for determining the print-to-cut register, in a multifunctional manner, wherein: - both the print-to-cut register is regulated; - And the pressure-to-cut register is monitored for exceeding a predetermined threshold value for fault detection when transporting a material web.