EP3393948B1 - Method for regulating the processing of a material web on the basis of register marks, and apparatus for carrying out the method - Google Patents

Description

The invention relates to a method for regulating the processing of a material web, in particular a material web of packaging material, that has a registration mark that has been passed past a processing device for the purpose of processing. Furthermore, the invention relates to a device for processing a material web, in particular packaging material web, on a processing device with at least one drive roller for driving the material web, with at least one processing tool for carrying out said method with at least one sensor for detecting register marks of the material web guided past the sensor, with an evaluation device for determining a deviation of an actual position of at least one machining tool of the machining device from a predefined position of the at least one machining tool for the same detection event and a control device for controlling the actual machining position of the at least one machining tool corresponding to the detection event of a register mark by the at least one sensor on the basis of the deviation determined by the evaluation device between the actual posit ion and the predetermined position of the at least one machining tool.

Material webs are often processed in several successive steps, with each individual processing step repeated at predetermined intervals along the material web. In this way, webs can be made with a variety of similar, successively arranged sections. During processing, the material web is typically driven by at least one drive roller.

Material webs can be provided for example with a multi-color print. In order to ensure a high print quality, the individual printing steps must be synchronized, ie congruent with each other. Alternatively or additionally, depending on the material web and the planned use of the material web, other processing steps, such as punching, cutting, folding embossing and perforating, are matched to each other so that material webs or material blanks produced as accurately as possible can be obtained.

These basic principles are largely independent of the material web. The material webs to be processed can be, for example, monolayer materials. But there are also multi-layered webs in question, which consist of a composite material and / or laminate. These can be used for example as packaging material. The packaging material is, for example, a packaging material laminate with interconnected individual layers of different materials, which impart different properties to the packaging material laminate. In many cases, so-called carton / plastic packaging laminates or cardboard composite packaging are suitable for foodstuffs, which are formed from a laminate comprising a cardboard layer and outer, in particular thermoplastic, plastic layers, for example made of polyethylene (PE). The carton provides the packages with sufficient stability to allow the packages to be easily handled and stacked, for example. The plastic layers can be sealed and protect the carton from moisture and food from absorbing unwanted substances from the package. Additionally, other layers such as barrier layers, such as aluminum, polyamide, and / or ethylene vinyl alcohol may be provided to prevent diffusion of oxygen and other gases through the package. Corresponding material webs are relatively thick and relatively strong, which can complicate the exact processing of the webs in successive steps to be performed.

To regulate the processing of a web of material having a register mark passed by a processing device for the purpose of processing, a so-called register control or print mark control is typically used. For this purpose, the web is provided at certain intervals with register marks or print marks, which can be detected by an optical sensor as soon as they pass through the sensor. Print marks represent register marks applied by printing, which in principle can also be provided in other ways than by printing. Such print marks are used for the control of a processing device for punching a moving web WO 2012/039934 A2 disclosed. The revelation WO 2012/039934 A2 is considered to be the closest prior art to the subject-matter of independent claims 1 and 10.

In most cases, the detection of the register marks takes place at a position which corresponds to an integral multiple of repetition lengths of the material web. The repetition length is determined by the length of the similar sections of the material web, for example the blanks cut out of the material, in particular the packaging material blanks. In this case, a repetition length would be defined, for example, by the distances between the front edges of the later packaging material blanks in the material web. Alternatively or additionally, however, the repetition length can also be understood by the distance between two similar processing points along the material web. For example, if the same decor is printed over and over again, the repeat length would be the distance between two identical points of successive decors. The register marks are also preferably provided at intervals corresponding to the repetition length.

If a register mark is detected by the sensor, it is also detected in which position the subsequent processing tool was located at the time of the registration of the registration mark, ie the detection event. This position is then compared with the predetermined position of the machining tool that the machining tool should have at the time of register mark registration. From this comparison, a deviation between the two positions is derived, which can optimally be equal to zero, if necessary, but also positive or negative. To compensate for this deviation, regulates a control device based on the Amount and the sign of the deviation, the position of the machining tool. The machining tool is briefly accelerated for this purpose or briefly braked. This means that the drive of the machining tool moves this briefly a little faster or a little slower. The period of time during which the acceleration and / or deceleration takes place is typically shorter than the time span that elapses between the detection of two consecutive register marks by the at least one sensor. By briefly accelerating or decelerating, it is thus attempted to influence the position of the machining tool so that it coincides with the predetermined position of the machining tool. Therefore, and due to the usually only minor deviations accelerating or decelerating occurs only very briefly. Due to the usually very high speed of the material bands, deceleration or acceleration is carried out in a pulse-like manner.

In practice, it has been shown that a very high control effort is required to achieve an exact processing of the material webs. This is all the more true if inaccuracies from previous work steps must be taken into account in subsequent processing steps. For example, during processing, a register mark may be introduced for subsequent processing with another processing tool. For example, part of the material web can be punched out in a processing device or a fold line can be provided in the material web. In order to align the subsequent processing exactly to the previous processing and thus to take into account any errors in the previous processing, the edge of the material web around the punched-out part of the material web or the fold line can be used as a register mark for a subsequent processing step, such as this subsequent Align machining at the location of the punching or folding.

Furthermore, slippage occurring during transport of the material web and / or acceleration or deceleration of the transport speed of the material web can ensure that the register marks are not detected by the sensor in the exact chronological sequence, as provided. On the one hand, deviations from the regularity of the detection of the register marks and deviations from the position of the processing tools relative to the predetermined position of the processing tools can therefore occur independently of one another. The regulation must try to balance both deviations together.

This is particularly problematic for those applications in which very high web speeds and / or strong accelerations of the web are to be realized. With an increasing interest in an ever more efficient production and ever lower unit costs, it is a constant effort to increase the web speeds and the accelerations of the material web during the processing of the material web ever further. However, this always leads to operating conditions in which the control is not fast enough or precisely enough able to compensate for errors related to the material web and / or the machining tool or to avoid. If predetermined fault tolerances are exceeded, parts of the material web must be discharged as rejects. So there is an optimization task to enable high web speeds and strong accelerations and at the same time reduce the committee in order to produce as cheaply as possible. This optimization task has so far not been satisfactorily resolved, in particular in the case of packaging material webs.

Therefore, the present invention has the object, the method and the device of the type mentioned in such a design and further that high web speeds and accelerations of the web when starting the device for processing the web while low waste can be realized.

• bei dem die Registermarken an wenigstens einem Registermarken erfassenden Sensor vorbeigeführt werden,
• bei dem eine Auswerteeinrichtung die Abweichung einer mit dem Erfassungsereignis einer Registermarke durch den wenigstens einen Sensor korrespondierenden tatsächlichen Position wenigstens eines Bearbeitungswerkzeugs der Bearbeitungseinrichtung von einer vorgegebene Position des wenigstens einen Bearbeitungswerkzeugs für dasselbe Erfassungsereignis ermittelt,
• bei dem eine Regeleinrichtung anhand der von der Auswerteeinrichtung ermittelten Abweichung zwischen der tatsächlichen Position und der vorgegebenen Position des wenigstens einen Bearbeitungswerkzeugs die tatsächliche Bearbeitungsposition des wenigstens einen Bearbeitungswerkzeugs regelt,
• bei dem die Auswerteeinrichtung anhand aufeinanderfolgender Erfassungsereignisse von Registermarken durch den wenigstens einen Sensor die tatsächliche Distanz aufeinanderfolgender Registermarken bezogen auf das Längensystem der wenigstens einen Antriebswalze, insbesondere bezogen auf die Winkeldifferenz und/oder die Umfangsdifferenz der Antriebswalze, ermittelt und in Beziehung zu einer erwarteten Distanz der Registermarken bezogen auf das Längensystem der wenigstens einen Antriebswalze gesetzt wird,
• bei dem anhand der Beziehung zwischen der tatsächlichen Distanz und der erwarteten Distanz der Registermarken ein Vorsteuerwert ermittelt wird und
• bei dem eine Steuereinrichtung, vorzugsweise Vorsteuereinrichtung, die Geschwindigkeit des wenigstens einen Bearbeitungswerkzeugs in Abhängigkeit von dem ermittelten Vorsteuerwert anpasst.

This object is achieved in accordance with claim 1 by a method for regulating the processing of a material web, in particular a material web of packaging material, that has a registration mark passing by a processing device for the purpose of processing,

• in which the register marks are passed past at least one register mark detecting sensor,
• in which an evaluation device determines the deviation of an actual position of at least one machining tool of the machining device corresponding to the detection event of a register mark by the at least one sensor from a predefined position of the at least one machining tool for the same detection event,
• in which a control device regulates the actual processing position of the at least one processing tool on the basis of the deviation between the actual position and the predetermined position of the at least one processing tool determined by the evaluation device,
• in which the evaluation device ascertains the actual distance of successive register marks relative to the length system of the at least one drive roller, in particular with respect to the angular difference and / or the circumferential difference of the drive roller, based on successive detection events of register marks by the at least one sensor and in relation to an expected distance Register marks based on the length system of at least one drive roller is set,
• in which a precontrol value is determined on the basis of the relationship between the actual distance and the expected distance of the register marks, and
• in which a control device, preferably a pilot control device, adapts the speed of the at least one machining tool as a function of the determined pilot control value.

The aforementioned object is also achieved in a device according to the preamble of claim 10, characterized in that the evaluation device is designed to determine a feed rate dependent on the web speed of the material web in the region of the at least one sensor on the basis of successive detection events of register marks by the at least one sensor, wherein the pre-control value is based on a relationship between the actual distance of successive register marks relative to the length system of the at least one drive roller, in particular based on the angular difference and / or the peripheral difference of the drive roller, and an expected distance of the register marks relative to the length system of the at least one drive roller is determined and that a control device, preferably pilot control device, for adjusting the speed of the at least one machining tool in dependence on the determined Vorst is provided.

According to the invention, the regulation of the position of the machining tool of the machining device is supplemented by a control of the speed of the machining tool. The speed of the machining tool is not determined based on the speed of a drive of the web as such, such as the angular velocity or peripheral speed of a roller or roller for driving the web or based on the speed of a motor for driving the web. Rather, the speed of the material web or a corresponding speed parameter corresponding to the speed of the material web is detected very accurately on the basis of the detection of the successive register marks and thus. The high accuracy is achieved because in the described manner the effective speed or a corresponding precontrol value corresponding to the effective speed of the material web, for example in the form of a speed parameter, of the material web is determined.

If the register marks are not provided at exactly predetermined intervals on the material web, for example because the preceding processing of the material web in which, for example, the register marks have been formed has occurred with errors, then the actual speed of the material web or the predetermined web speed is less important than on the relevant speed for the upcoming processing, so the effective web speed, the web. This describes, for example, the speed with which the register marks are brought to the next processing device or the processing tool. If the processing of the material web with the processing tool is to be coordinated with the register marks, the speed of the register marks, which may or may not be the same as the absolute speed of the material web or the predetermined web speed, is of essential importance.

The detection of the web speed on the basis of the register marks is therefore more accurate than the determination of the web speed based on the drive for the material web, be it related to a motor, the speed of a drive roller or another parameter, because such a slip between the drive and web and / or an elongation of the material web is detected during its transport. This can then be taken into account in the further processing of the material web.

Ultimately, detecting the effective speed of the web allows the speed of the machining tool to be adjusted to the effective web speed. The speed of the machining tool is not regulated, but controlled. The control is characterized by an open sequence of action, in which an input variable according to certain laws or specifications influences an output variable without the success of the influencing being continuously checked or corrected. On the other hand, when regulating, an output variable, which is also referred to as a controlled variable or actual value, is continuously recorded and compared with a reference variable or a nominal value. The Rules is therefore characterized by a closed course of action, the so-called control loop, which serves the purpose of adapting the output variable to the reference variable or nominal value.

In other words, the speed of the machining tool is increased as an increasing effective web speed is determined while the speed of the machining tool is reduced as a decreasing effective web speed is determined. Since the speed of processing tools for processing material webs can typically be set very accurately and reproducibly, it is fundamentally unnecessary to continuously record the speed of the processing tool and to control it by comparison with the predetermined speed of the processing tool. In addition, the controller takes into account the fact that the desired speed of the machining tool does not have to remain approximately constant, but can change very quickly if necessary, which may be the case in particular when starting and stopping the machine for processing the material web. A regulation could hereby be easily overwhelmed and lead to an inaccurate or unstable operation of the system.

The material web is, in particular, a packaging material web, since the process can be used particularly advantageously with these material webs. This applies in particular to packaging materials in the form of packaging material laminates which, in the case of a cardboard / plastic packaging laminate, may have at least one inner cardboard layer and outer, in particular printed, sealable plastic layers. In addition, there is usually at least one further layer, in particular of aluminum. The packaging laminates are used to form packages, which are usually used to fill food.

Simple, reliable and quite accurate, the web can be driven via the at least one drive roller. Between the drive roller and the Material web may be a frictional engagement, so that the material web is driven, for example, at least substantially at the peripheral speed of the drive roller. The peripheral speed of the drive roller and the web speed can then correspond to each other. In the case of the drive via a drive roller, the precontrol value determined on the basis of the detection of the register marks by the at least one sensor, for example in the form of a speed parameter, can be simply related to the length system of the at least one drive roller. Thus, the detection events of successive register marks are, for example, related to the distance over which the drive roller has continued to rotate between the detection of the successive register marks. The corresponding precontrol value or speed parameter can be related for the sake of simplicity to the angular difference and / or the circumferential difference of the follower roller or drive roller between two detection events. The angular difference is the angle through which the roller has continued to rotate between the corresponding detection events and the circumferential difference is the distance that a circumferential point between the corresponding detection events has traveled along the circumference. The circumference difference and the angular difference are therefore in direct contact with each other with rollers having a circular cross section. Thus, it can be determined whether the speed of the register marks or the effective web speed coincide with the expected web speed or the drive speed of the material web or not, if necessary, to be able to react accordingly.

Incidentally, the evaluation device can use detection events to determine the actual distance of successive register marks relative to the length system of the at least one drive roller, in particular with respect to the angular difference and / or the circumferential difference of the corresponding roller, and in relation to an expected distance of the register marks relative to the length system the at least put a corresponding roller. The amount and the sign of the deviations determined thereby can be very simple for Adjusting the speed of the machining tool are used. For the sake of simplicity, the speed of the machining tool can initially be set to be identical to the speed of the drive roller. If a deviation of both speeds must be taken into account, this is detected by measurement in the manner described and taken into account via the precontrol value for the purpose of compensating for the deviation. The described deviation can consequently be used for the exact change in the speed of the machining tool.

In other words, based on the relationship between the actually determined distance of the register marks relative to the length system of the drive roller and the expected distance of the register marks, a pre-control value can be determined which can then be applied to the control loop. The precontrol value fundamentally alters the speed of the machining tool in the sense of a control, while, moreover, the position of the machining tool is regulated, in particular via briefly impressed differential speeds. In this case, the manipulated variable can result in particular from a superimposition of precontrol of the speed and regulation of the position of the at least one machining tool.

The relationship to the length system of the drive roller can be achieved, for example, that is recorded for each detection event of a register mark by which distance a certain reference point along the circumference of the drive roller from a certain reference location on the circumference of the drive roller is removed. This distance may be, for example, 300 mm (L1) for a detection event and 405 mm (L2) for a subsequent detection event. If the theoretically expected distance between two consecutive register marks is 100 mm (LT), the distance of the reference point from the reference location at the subsequent detection event would have been expected to be 400 mm. The corresponding difference between the actual and the expected Value based on the length system is therefore 5 mm (LD) and can be used to determine the pre-control value. $$\mathrm{LD}=\mathrm{L}2-\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="imgf0002.png"\; state="\{\{state\}\}">L</figure-callout>}1+\mathrm{LT}$$

For this purpose, in particular first of all a normalization to the expected length value, which is used as pre-control value or for determining a pre-control value, for example in the form of a speed parameter (VD), can be used, for which purpose the circumferential speed of the drive roller (VA) can be used. $$\mathrm{VD}=\mathrm{VA}\cdot \left(\mathrm{LT}-\mathrm{LD}\right)/\mathrm{LT}$$

Instead of circumferential distances or circumferential lengths, the calculation of a pre-control value described above by way of example could also be carried out based on angular differences of a reference point of the drive roller to an angle reference of the drive roller.

Hereinafter, for ease of understanding and to avoid unnecessary repetition, the method and apparatus of the aforementioned kind will be described in common, without distinguishing in detail between the method and the apparatus. For the person skilled in the art, however, it will be readily apparent from the context which features are preferred for the device and method.

In a first preferred embodiment of the method, the evaluation device determines, as a precontrol value, a speed parameter which is dependent on the web speed of the material web in the region of the at least one sensor, based on the length system of the at least one drive roller. This simplifies the control since the speed to be adjusted is corrected or adjusted by the corresponding speed parameter can be. Thus, if necessary, this results in a target speed, which is dependent on the speed parameter, for the machining tool, which can be set or specified accordingly.

Alternatively or additionally, it is preferred if the at least one machining tool is driven by a motor. Thus, the movement speed of the machining tool can be set quite accurately and reliably. It is further preferred if the machining tool rotates about an axis. This is a simple movement that can easily be sustained at about constant speed. In addition, the regulation of the position of the machining tool is then quite possible. This applies in particular to the case that the axis is aligned parallel to the material web and perpendicular to the transport direction of the material web in each case in the region of the processing device or of the processing tool. Thus, the rotational speed of the machining tool can be easily adapted to the web speed. The rotation can take place both in the direction of movement of the material web and in opposite directions to this direction. In order to be able to easily provide rotating processing tools, they can be formed or carried by a processing roller.

Regardless of the drive and the type of movement of the machining tool, the machining position of the at least one machining tool can be controlled at least by a short-term, in particular pulse-like, acceleration and / or deceleration of the speed of the machining tool. Thus, the position of the at least one machining tool can be easily adapted to the sections of the material web to be processed. This applies in particular to rotating machining tools and more particularly to those having a rotation axis which is aligned parallel to the material web and perpendicular to the web speed in each case in the region of the machining device or of the machining tool.

Alternatively or additionally, it is expedient for stable and rapid control when the machining position of the least one machining tool is controlled by means of a control circuit by briefly accelerating or decelerating or decelerating the at least one machining tool moving at a predetermined speed. Independently of this, the predefined speed of the at least one machining tool can, if required, be increased or reduced by way of feedforward control. This feedforward control is simple and with sufficient accuracy to perform.

The method can be used particularly expediently if the at least one machining tool is a cutting tool, a perforating tool, an embossing tool, a punching tool, a folding tool and / or a pressure tool. These machining tools must work very accurately on a regular basis and are usually accessible to a very fast control.

In addition, the method is particularly effective when using material webs in the form of packaging material webs, preferably from a packaging material laminate, in particular a cardboard / plastic packaging material laminate. Corresponding material webs can not be processed satisfactorily with the known methods.

Alternatively or additionally, the present method can be referred to register marks that are integrated in a decor or provided next to a decor. If necessary, but also print marks, embossing, folding, punching and / or material differences come into question. In this way, subsequent processing of the material web can be tuned to previous processing of the material web. In embossing and folding depressions or elevations of the material web can be formed, for example, which can be detected by a sensor. If parts of the material web are punched out, edges are created which are also detected by a sensor can. If necessary, parts of the material web are punched out so that they can easily carry straws, attach spouts or open packages.

So that other brands than the register marks to be detected are not inadvertently detected by the at least one sensor, a so-called gate control can be used. In this case, a release device is used, the time-related and / or length-related, for example, based on the length system of the web, window opens, in which the detection of the register mark is permitted. Only then can a register mark be detected by the at least one sensor or the detection result can only be forwarded to an evaluation device or processed by it. The corresponding flags are determined by the at least one sensor based on the detection events of the register marks. The windows are thus always open for a certain period or a certain length of the material web in which the next register mark is expected. Since the distance of the register marks is at least approximately known, the detection of the last register mark and, if necessary, additionally the speed of the material web can be estimated when the next register mark should be detected, for example. Around the expected next register mark is then opened by the release device another window, in particular predetermined width.

In order to be able to relate the detection events exactly to the length system of the drive roller, it makes sense if the corresponding roller has a roller sensor for detecting a parameter dependent on the length system of the at least one roller, in particular an angle, an angular difference of a circumferential length and / or a circumferential difference , So that, alternatively or additionally, the position of the machining tool can be detected exactly, the machining tool and / or the machining roller may be assigned a position sensor which detects, for example, the position of the machining tool or the angle of the machining roller.

Fig. 1

ein erfindungsgemäßes Verfahren und eine erfindungsgemäße Vorrichtung in einer schematischen Darstellung und

Fig. 2

das Verfahren und die Vorrichtung in einer Fließbilddarstellung.

The invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. In the drawing shows

Fig. 1

an inventive method and a device according to the invention in a schematic representation and

Fig. 2

the method and the device in a flow diagram representation.

In the Fig. 1 a device 1 for processing a material web 2 in the form of a packaging material web of a packaging material laminate is shown. The packaging laminate is a paperboard / plastic laminate comprising a paperboard layer, an aluminum layer and outer printed polyethylene layers. The material web 2 can be unwound from a roll or otherwise supplied to the device 1. The material web 2 is transported in a straight line through the device 1 which is shown and in this respect preferred. However, this is not mandatory, but simplifies the presentation. The material web 2 is driven in the illustrated preferred device 1 via a drive roller 3 for which the material web 2 is guided through a nip 4 between the drive roller 3 and a pressure roller 5. The nip 4 is so narrow that a frictional engagement between the drive roller 3 and the material web 2 can be provided. The drive roller 3 is driven by a drive 6, in particular an electric motor drive.

The material web 2 is thereby transported to the right and thereby guided past a sensor 7, which is an optical sensor 7 in the apparatus 1 which is preferred and so far preferred. If necessary, however, other sensors and / or further sensors may be provided. The sensor 7 is provided so that it detects register marks 8 provided on the material web 2 in the form of print marks when they pass the sensor 7. After the material web 2 has passed the sensor 7, the material web 2 reaches a processing device 9 with a processing tool 10 and insofar preferred apparatus 1 is a processing device 9 for dividing the material web 2 into individual blanks, which can be used as packaging blanks for the formation of packages, in particular for filling food. For cutting off the blanks from the material web 2, the processing device 9 has a processing tool 10 in the form of a processing roller with two cutting blades 11. The processing roller rotates with the transport direction T of the material web 2 so that the cutting blades 11 are guided past a fixed cutting edge 12 provided on the other side of the material web 2, thereby severing or cutting through the material web 2 transversely to the transport direction T. The machining tool 10 is driven by a drive 13, which in the present case is designed as an electromotive drive.

Alternatively or additionally, however, other processing tools may also be provided which, for example, print, perforate, emboss, fold or punch the material web 2. In addition, instead of print marks, fold lines, punches, perforations, material differences or other features of the material web 2 can also be used as register marks 8. It may then be necessary, if necessary, to use other than an optical sensor 7.

The drive roller 3 and the machining tool 10 are associated with a roller sensor 14 and a position sensor 15, which detect the position of the associated rollers 3,10 and this position in the form of a signal S to an evaluation device 16 passes. Likewise, the sensor 7 detecting the register marks transmits a signal S to the evaluation device 16 when a register mark 8 passes the sensor 7. Thus, the evaluation device 16 can compare the machining position of the machining tool 10 when detecting a register mark 8 or the machining position of the machining tool 10 corresponding to a detection event of a register mark 8 with a machining position of the machining tool 10 predetermined for the detection event. Will this one Detected deviation between the actual and the predetermined machining position, by means of a control device 17 is a control intervention that affects the drive 13 of the processing device 9 so that the corresponding deviation of the processing positions is reduced or possibly canceled. This is done in the illustrated and so far preferred method by a momentary or pulse-like acceleration or deceleration of the speed of the machining tool 10th

The evaluation device 16 can also use the successive detection events of register marks 8 by the at least one sensor 7 to determine a speed parameter which depends on the web speed of the material web 2 in the region of the at least one sensor 7. The evaluation device 16 relates the web speed to the length system of the drive roller 3 by the angle by which the drive roller 3 has been further rotated between two detection events is related to the detection events. Thus, it can be determined whether the expected spacing of the register marks 8 with respect to time and / or length of the material web 2 with the actually determined distance of the register marks 8 also coincides with respect to time and / or length of the material web 2. If this is not the case because, for example, the register marks 8 do not have the predetermined distances, slip occurs during transport of the material web 2 or stretching of the material web 2 takes place, the speed of the processing tool 10 can be adapted accordingly via a control device 18. In addition, a regulation of the machining position of the machining tool 10 is carried out separately therefrom. Both the control and the control generate actuating variables U, which, if necessary, act on the drive 13 of the machining roller 10 of the machining device 9 superimposed on one another.

In the Fig. 2 the method described above is shown in somewhat more detail. Identical assemblies are therefore identified by the same reference numerals. As a reference variable W, a speed of the machining tool 10 (Setpoint) specified and, if necessary, with a, in particular constant deviation (offset) are occupied. Thereby, the speed of the Bearbeitungswerkezugs 10 is to be specified corresponding to the speed of the drive roller 3 for driving the material web 2. A regulator R outputs a manipulated variable U on the basis of the corresponding reference variable W, accordingly the drive of the machining tool 10 is driven.

Now, if a deviation occurs between the predetermined machining position of the machining tool 10 and the actual machining position of the machining tool 10 for a detection event of a register marks 8 by the sensor 7, the comparing unit D1 sends in the information E about the detection event and information P on the position of the machining tool converge, a dependent of the magnitude and the sign of the deviation signal S to a position control device PR, which adds a corresponding manipulated variable U to the controller R leaving the control variable U. Alternatively or additionally, if the effective web speed determined from the detection events of the register marks 8 by the sensor 7 does not correspond to the web speed as would be expected from the speed of the power roller 3, the comparing unit D2, in the information E, passes the detection event and information L on the length system of the drive roller 3 depending on the magnitude and the sign of the corresponding deviation, a signal S to a calculation unit B, which calculates a correction speed based on the corresponding signal S, which is then given as a reference variable W to a correction speed control KR, which in turn a Output manipulated variable U, which is added to the manipulated variable U, which has already been determined previously.

A gate control T receives information E about the detection events and uses this and, if necessary, additional, a web speed parameter to determine a window according to time and / or material web position in which the next detection event is to be expected, and outputs the information concerning the window as gate control information TS to the sensor 7 on. Outside this window, no detection is performed or the corresponding detection event is not further processed in the manner described.

Claims (14)

1. Method for regulating the processing of a material web (2), in particular a packaging material web, that has register marks (8) which are guided past a processing device (9) for the purpose of processing,

   - in which the material web (2) is driven via at least one drive roller (3),

   - in which the register marks (8) are guided past at least one sensor (7) that captures the register marks (8),

   - in which an evaluation device (16) determines the deviation of an actual position,corresponding to the capturing event of a register mark (8) by the at least one sensor (7) of at least one processing tool (10) of the processing device (9) from a predetermined position of the at least one processing tool (10) for the same capturing event,

   - in which a regulating device (17) uses the deviation between the actual position and the predetermined position of the at least one processing tool (10) determined by the evaluation device (16) of the at least one processing tool (10) to regulate the actual processing position,

   - in which the evaluation device (16) uses successive capturing events of register marks (8) by the at least one sensor (7) to determine the actual distance of successive register marks (8) in relation to the measurement system of the at least one drive roller (3), in particular in relation to the angular difference and/or the circumferential difference of the drive roller (3), and correlates this with an expected distance of the register marks (8) with regard to the measurement system of the at least one drive roller (3),

   - in which the correlation between the actual distance and the expected distance of the register marks (8) is used to determine a pilot-control value and

   - in which a control device (18), preferably a pilot-control device, adjusts the speed of the at least one processing tool (10) as a function of the pilot-control value determined.
2. Method according to claim 1,

   - in which the evaluation device (16) determines as a pilot-control value a speed parameter as a function of the path velocity of the material web (2) in the region of the at least one sensor (7) in relation to the measurement system of the at least one drive roller (3).
3. Method according to claim 1 or 2,

   - in which the at least one processing tool (10) is motorised and preferably rotated about an axis, in particular aligned parallel to the material web (2) and perpendicular to the transport direction (T) of the material web (2) in each case in the area of the processing device (9).
4. Method according to any one of claims 1 to 3,

   - in which the processing position of the at least processing tool (10), at least also, is regulated by a brief, in particular almost pulsed, acceleration and/or deceleration of the speed of the processing tool (10).
5. Method according to any one of claims 1 to 4,

   - in which the processing position of the at least one processing tool (10) is regulated by means of a control loop through brief accelerations or brakings of the at least one processing tool (10) moving with a predetermined seed and/or

   - in which the predetermined speed of the at least one processing tool (10) is increased or decreased via a pilot control.
6. Method according to any one of claims 1 to 5, in which as the at least one processing tool (10) a cutting tool, a perforation tool, an embossing tool, a folding tool, a stamping tool and/or a printing tool is used.
7. Method according to any one of claims 1 to 6, in which as the material web (2) a packaging material web, preferably made from a packaging material laminate, in particular a board/plastic packaging material laminate, is used.
8. Method according to any one of claims 1 to 7, in which as register marks (8) integrated into a decoration or provided alongside a decoration print marks, embossings, folds, stampings and/or material differences are used.
9. Method according to any one of claims 1 to 8, in which a release device or door control (T) uses the capturing events of the register marks (8) by the at least one sensor (7) to specify a time-related and/or distance-related window for the next expected capturing event, in which a capturing event of a register mark (8) by the at least one sensor (7) can be captured, relayed and/or processed at the evaluation device (16).
10. Device (1) for the processing of a material web (2), in particular a packaging material web, on a processing device (9) having at least one processing tool (10), preferably for carrying out the method of any one of claims 1 to 9, having at least one drive roller (3) for driving the material web (2), having at least one sensor (7) for capturing register marks (8) of the material web (2) guided past the sensor (7), having an evaluation device (16) for determining a deviation of an actual position, corresponding to the capturing event of a register mark (8) by the at least one sensor (7) of at least one processing tool (10) of the processing device (9) from a predetermined position of the at least one processing tool (10) for the same capturing event, and having a regulating device (17) for regulating the actual processing position of the at least one processing tool (10) using the deviation between the actual position and the predetermined position of the at least one processing tool (10) determined by the evaluation device (16), characterised in that the evaluation device (16) is configured to determine a pilot-control value as a function of the path velocity of the material web (2) in the area of the at least one sensor (7) using successive capturing events of register marks (8) by the at least one sensor (7), wherein the pilot-control value is determined on the basis of a correlation between the actual distance of successive register marks (8) in relation to the measurement system of the at least one drive roller (3), in particular in relation to the angular difference and/or the circumferential difference of the drive roller (3), and an expected distance of the register marks (8) in relation to the measurement system of the at least one drive roller (3), and in that a control device (18), preferably a pilot-control device, is provided for adjusting the speed of the at least one processing tool (10) as a function of the pilot-control value determined.
11. Device according to claim 10, characterised in that the at least one processing tool (10) is motorised and, preferably, the processing tool (10) rotates about an axis of rotation, in particular aligned parallel to the material web (2) and perpendicularly to the transport direction (T) of the material web (2) in each case in the area of the processing device (9).
12. Device according to claim 10 or 11, characterised in that a roller sensor (14) is provided for capturing a parameter dependent upon the measurement system of the at least one drive roller (3), in particular an angular difference and/or a circumferential difference of the drive roller (3) between two events.
13. Device according to any one of claims 10 to 12, characterised in that the processing tool (10) is associated with a position sensor (15) which, by way of example, captures the position of the processing tool (10).
14. Device according to any one of claims 10 to 13, characterised in that the at least one processing tool (10) is a cutting tool, a perforation tool, an embossing tool, a stamping tool and/or a printing tool and/or in that the material web (2) is a packaging material web, preferably made from a packaging material laminate, in particular a board/plastic packaging material laminate, and/or in that the register marks (8) are print marks, embossings, perforations, foldings, punchings and/or material differences integrated into a decoration and or alongside a decoration.

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