Cutting device for cutting a ribbon-shaped material, in particular a sticky cord ribbon

Abstract

Cutting device for cutting a ribbon-shaped material, in particular a sticky cord ribbon, comprising two knife elements (4, 6, 17, 19, 23, 25) cooperating with each other for cutting, wherein each knife element (4, 6, 17, 19, 23, 25) is arranged on a knife carrier (5, 7, 18, 19, 24, 26) which in turn is arranged directly or indirectly on a device frame (3), characterized in that at least one vibration sensor (10, 11, 21, 22, 27, 28) is provided, via which vibration information, which is a measure of a vibration of the knife elements (4, 6, 17, 19, 23, 25) generated by the interaction of the knife elements (4, 6, 17, 19, 23, 25) during a cut, can be detected, and that a device for determining a the condition of one or both knife elements (4, 6, 17, 19, 23,25) a processing unit (12) set up to provide wear information based on the vibration information and a display unit (13) for outputting the determined wear information is provided.

Description

[0001] The invention relates to a cutting device for cutting a band-shaped material, in particular an adhesive cord band, comprising two knife elements which interact with one another for cutting, wherein each knife element is arranged on a knife carrier which in turn is arranged directly or indirectly on a device frame.

[0002] Cutting devices of the type described are used, for example, in tire manufacturing. They are used to cut strip-like material, in particular sticky cord bands, either steel cord or textile cord. The term "cutting device" refers to different types of machines. These are roughly divided into shears and slitters. Examples of shears used here include guillotine shears, i.e., guillotine shears with a bar-shaped, vertically movable upper blade and a bar-shaped, fixed-position lower blade; circular or roller shears with a rotating, horizontally movable circular blade and a fixed-position blade bar; or shears with a rapidly rotating saw blade. These shears are used to cut individual sections from an endless belt. Various such shears are described, for example, in DE 20 2013 103 082 U.A slitter is used to divide an endless belt lengthwise, creating two or more partial belts. This typically involves two circular blades that work together to separate the material.

[0003] Regardless of the type of cutting device, the respective knife systems are subject to a certain amount of wear. Depending on the stress and wear, appropriate maintenance and adjustment work must therefore be carried out. The time for maintenance or a knife change or adjustment during ongoing operation is difficult to determine. In practice, the maintenance personnel check the condition of the respective knife system at defined maintenance intervals and, if necessary, adjust the knife system accordingly, i.e. readjust it, or replace the knife system in the event of excessive wear. However, until it is recognized that adjustment or a knife change is necessary, operations continue, possibly resulting in the production of a corresponding amount of scrap material.If necessary intervention is detected, this leads to a shutdown of the cutting device and thus the entire system, inevitably resulting in a production downtime. Since the load on the measuring system is influenced not only by the number of cutting processes but also by the material type, material width, and material thickness, various parameters are present that promote wear, making it even more difficult to detect wear that requires action in a timely manner.

[0004] The invention is therefore based on the problem of providing a cutting device which is improved compared to the above.

[0005] To solve the problem, at least one vibration sensor is provided in a cutting device of the type mentioned at the outset, via which vibration information which is a measure of a vibration of the knife elements generated by the interaction of the knife elements during a cut can be detected, and a processing device is provided which is set up to determine wear information indicating the state of one or both knife elements on the basis of the vibration information, and a display device is provided for outputting the determined wear information.

[0006] The invention is based on the finding that with every cut, the knife system generates oscillations that lead to vibrations in the equipment. It has now been found that these oscillations or the oscillation spectrum change over time and therefore with increasing wear of the knife elements. As a rule, stronger oscillations or vibrations result from wear-related misalignment, which would require adjustment, or the corresponding wear of the knife elements, which means reduced cutting quality. Due to wear, the oscillation amplitudes increase, i.e., greater oscillation accelerations occur at the knife elements or the knife carriers or the coupled equipment components into which the vibrations are introduced.According to the invention, an oscillation generated during a cut, or the vibrations generated during the cut, which are generated by the interaction of the knife elements and the strip material, is detected by means of at least one oscillation sensor. The oscillation sensor thus provides oscillation information in the form of sensor signals that represent the oscillations or vibrations and are based on the interaction of the knife elements cutting the strip material. The sensor signals are sent to a processing device that is configured to process the sensor signals and determine wear information based on them. This wear information ultimately provides information about the condition of the knife system orof the knife elements, so that the wear information is an indicator of whether the knife system is cutting the strip material as required, or whether the cutting quality has decreased due to wear and tear, resulting from incipient or advanced wear of the knife elements. The wear information ultimately provides information about whether or not action by maintenance personnel is required.

[0007] According to the invention, the wear information is output to a display device, for example a monitor or an illuminated display or the like, in a way that is detectable by maintenance personnel, so that the personnel can easily record the wear information and draw appropriate conclusions from it. The wear information can be extremely simple in its information content, for example in the form of a color display, which can also be structured, for example, like a traffic light system. If the determined wear information indicates that the vibrations present in the monitored cut or several vibrations or spectra recorded within a monitoring cycle lie within a tolerance range that is assigned to a knife system showing no or only negligible wear, then a green illuminated display can be provided, for example.If the vibrations or the vibration spectrum lie within a tolerance range associated with a blade system with a given, yet acceptable, level of wear, a yellow indicator light can be issued as a warning signal. If the vibrations or vibration spectra are detected within an interval associated with increased or high wear of the blade system, a red indicator light can be issued as an alarm signal, requiring the fastest possible action. This traffic light system therefore allows for timely detection of a certain level of wear, allowing appropriate precautions to be taken. Preventive action can be taken before excessive wear is detected, or immediate action can be taken when excessive wear is detected.In addition to such a color light system, any other type of display, for example in text form or a symbol field, etc., is of course also conceivable in order to communicate the respective wear information accordingly.

[0008] The system therefore allows for quasi-continuous monitoring of cutting behavior, regardless of the process, i.e., regardless of the type of device being considered, whether it is a pair of shears and, if so, which type, or a slitter, etc., as well as regardless of the material being cut, such as steel cord or textile cord, the thickness of the material being cut, etc., since only the respective oscillation or vibration behavior, the sole cause of which is the cutting quality, which in turn depends on the quality of the knife system, is taken into account. By using at least one vibration sensor, the cutting process can be continuously recorded and analyzed by the processing device, and a statement on the wear of the knife system can be output in the form of wear information.This allows any wear to be recorded and communicated in real time, allowing for timely response. Manual intervention by maintenance personnel to check the knife system, which would necessitate a shutdown of the cutting system, is therefore eliminated. Instead, upon detection of wear, maintenance or a possible knife replacement can be scheduled early, thus avoiding downtime of the cutting system due to knife wear during production and maintaining a high level of product quality, while avoiding rejects.

[0009] As described, the processing device serves to determine the wear information based on the vibration information determined via the vibration sensor, i.e., the sensor signal. Within the scope of this determination, in a further development of the invention, the processing device can be configured to determine the wear information based on a comparison of the vibration information or comparison information determined on the basis thereof with at least one piece of reference information. Specific reference information for the type of cutting device, optionally specified with respect to the cut material, is stored in the processing device, for example, reference vibration modes or reference vibration spectra associated with different wear states.The processing device is now configured to compare either the sensor signals supplied by the vibration sensor directly or comparison information determined based on them, for example, comparison values ​​such as vibration amplitude values ​​or vibration acceleration values, with the reference information, which is naturally defined accordingly, for example, a comparison amplitude value or a comparison acceleration value. This comparison therefore makes it easy to determine the degree of wear associated with a detected actual vibration or a detected actual vibration value, so that corresponding wear information can be easily determined.

[0010] In addition to the actual sensor signal, one or more material parameters, in particular the thickness, width, and type of material (e.g., steel or textile cord), are preferably also recorded. These material parameters are also assigned to the reference information so that the reference information assigned to the monitored process is used for comparison purposes. The measured values ​​are recorded continuously, i.e., the data is recorded in real time during the ongoing process and processed by the processing device, which has the appropriate processing algorithms for this purpose.With a good cutting performance, i.e. with a wear-free or very minimally worn blade system, the vibration information or the signal curve provided by the vibration sensor shows a clear, relatively sharp curve with a relatively sharp peak in a very narrow frequency range, which is only slightly distorted towards lower and higher frequencies. Whereas with a more or heavily worn blade system, the vibration information or the signal curve is more or more distorted or blurred and may exhibit multiple peaks at different frequencies, which is an indication of corresponding blade wear. The frequency of the oscillations or vibrations is in the kilohertz range. The reference information is stored in the processing device and was previously recorded.If the processing algorithm that processes the sensor signals and determines the wear information is a self-learning algorithm, possibly based on artificial intelligence, the algorithm can be trained using previously recorded reference information, such as reference signal curves, for specific wear patterns and operating parameters. Furthermore, a self-learning system evolves over the course of operation based on the continuously recorded sensor information, so that the processing becomes increasingly more specific and precise over time.

[0011] According to a particularly advantageous development of the invention, the processing device is set up to determine a comparison value, in particular an average value, which serves as comparison information, on the basis of several pieces of vibration information recorded one after the other. As described, the cutting behavior is monitored virtually continuously and corresponding vibration information is recorded, whereby a corresponding signal does not have to be recorded for each cut, but only at defined intervals, for example after every 10th, 50th or 100th cut. At each recording time, several pieces of vibration information from several cuts carried out in quick succession can also be recorded and, for example, a defined measured value can be considered from each of these and an average value can be calculated for this cycle, which forms the basis for further processing.Within each recorded vibration information item, a defined measured value is considered, which forms the basis for further processing. This measured value could be, for example, the given maximum vibration acceleration or the maximum amplitude within the vibration signal. Over time, this results in a corresponding set of vibration information items or measured values ​​determined from these, which can be displayed as a curve in a diagram. The processing device is then able to process these multiple temporally recorded vibration information items to determine a comparison value, such as an average value or an average value curve. This comparison value represents the comparison information, which is taken into account when comparing with the reference information.

[0012] This reference information can describe a condition or be assigned to a condition that describes sufficiently severe wear and requires timely action. If it turns out that the comparison information, i.e. the current comparison value resulting from the last recorded vibration behavior, corresponds to the reference information or is greater in value than it, a corresponding display can be issued requesting intervention by personnel. For example, if the maximum vibration acceleration in the vibration spectrum is determined as the signal information to be processed and the comparison value is determined based on this, a corresponding reference value assigned to a defined wear condition, which also describes a vibration acceleration, is also used as reference information within the comparison.

[0013] It is also conceivable for at least a first and a second piece of reference information to be provided, wherein a first piece of wear information can be output depending on a comparison of the comparison value with the first reference information and a second piece of wear information can be output depending on a comparison of the comparison value with the second reference information. The information system is therefore staggered. If the comparison shows that the comparison information corresponds to or is greater than the first reference information, then a yellow light can be output as a warning signal for an impending required intervention, for example as part of the traffic light system. If the comparison shows that the comparison information corresponds to or is greater than the second reference information, then a red light can be output as an alarm signal.

[0014] Although a single vibration sensor can already record corresponding vibration information, it is of course conceivable that several vibration sensors arranged at different positions are provided, with the processing device being configured to determine the wear information based on the vibration information from the multiple vibration sensors. The separate sensor signals are processed separately and compared with their own reference information, thus providing redundancy. Consequently, if one vibration sensor fails, a corresponding wear measurement is still possible. Of course, the processing device also allows the resulting evaluation results to be compared with each other, thus enabling a type of verification. This of course also results in a correspondingly broader database that can be considered in a long-term evaluation.

[0015] As described, the vibrations are generated by the knife system, i.e., by the interacting knives. Therefore, it is expedient for the vibration sensor or at least one of the multiple vibration sensors to be arranged on a knife carrier, so that the vibration behavior is ultimately recorded directly at the point of generation. However, it is also conceivable to arrange the vibration sensor or at least one of the multiple vibration sensors on the device frame. As described, the knife carriers are ultimately always mechanically coupled to the device frame, so that any vibrations generated by the knife elements are inevitably also coupled into the device frame, where they can be recorded by the vibration sensor.

[0016] As described, the cutting device can be implemented in different types. One type of device is a shear, also called a guillotine shear. In this case, the first knife element is an upper knife, which is arranged on a first knife carrier, and the second knife element is a lower knife, which is arranged on a frame carrier provided on the device frame, which is fixed in position and serves as the second knife carrier. In this type, the vibration sensor or one of the several vibration sensors is arranged on the first knife carrier or a knife carrier guide provided on the device frame, i.e. in the area of ​​the upper knife, or on the frame carrier, i.e. in the area of ​​the lower knife. The frame carrier can also be a table plate, over which the strip material fed to the knife system is conveyed.

[0017] In a further development of this variant, it is conceivable for at least one first vibration sensor to be provided on the first knife carrier or the knife carrier guide, and at least one second vibration sensor to be provided on the frame carrier. Consequently, two vibration sensors are arranged on both vibration-generating elements or in their immediate vicinity, each of which provides separate measurement signals that can be evaluated accordingly.

[0018] Of course, it is also possible to provide several first vibration sensors on the first knife carrier or the knife carrier guide and / or several second vibration sensors on the frame carrier, i.e. that more than two vibration sensors are arranged distributed at different positions.

[0019] Another type of device is a roller shear. This can have a roller knife as the first knife element, which is arranged on a horizontally movable knife carrier, and a second knife element, which can have a fixed knife bar, which is arranged on a fixed frame support provided on the device frame and serves as the second knife carrier, and along which knife bar the roller knife can be moved. A vibration sensor is arranged on the first knife carrier or on a guide provided on the device frame for the first knife carrier, or on the frame support, or on the device frame. This cutting device is characterized by the combination of a horizontally movable roller knife, which moves along a horizontally extending, fixed knife bar and cuts the strip material.Here, too, if only one vibration sensor is provided, it can be arranged at different positions, although several vibration sensors can also be arranged at different positions. The frame support on which the cutter bar is mounted can also be a tabletop supporting the strip material before cutting.

[0020] A design of the cutting device as a slitter can have a first roller knife as the first knife element and a second roller knife as the second knife element, wherein the first roller knife is arranged on a first knife carrier that is movable on the device frame and the second roller knife is arranged on a second knife carrier that is fixed in position on the device frame, wherein a vibration sensor is arranged on the first knife carrier or on a guide provided on the device frame for the first knife carrier or on the second knife carrier or on the device frame. The strip material to be cut lengthwise here runs between the two roller knives and is cut into corresponding sub-strips. One of the roller knives is arranged on a horizontally movable first knife carrier, for example an adjustment plate, via which an adjustment of the first roller knife relative to the second roller knife is possible.The second roller knife is attached to a second knife carrier that is fixed in position on the device frame. The one or more vibration sensors can also be arranged at different positions here.

[0021] The descriptions and list of the different types of cutting devices that can be equipped with the wear detection system according to the invention are not exhaustive; rather, the wear detection system can also be integrated into other cutting devices not explicitly mentioned here.

[0022] In addition to the cutting device itself, the invention further relates to a method for determining and outputting wear information of a first and / or second blade element of a cutting device, wherein the cutting device has a device frame and two blade elements which interact with one another for cutting, wherein each blade element is arranged on a blade carrier which in turn are arranged directly or indirectly on the device frame, wherein vibration information which is a measure of a vibration of the blade elements generated by the interaction of the blade elements during a cut is detected by means of at least one vibration sensor, and wherein wear information indicating the state of one or both blade elements is determined on the basis of the vibration information by means of a processing device and is output via a display device.

[0023] In a further development of the method, the processing device can be configured to determine the wear information on the basis of a comparison of the vibration information or comparison information determined on the basis thereof with at least one reference information.

[0024] Furthermore, a comparison value, in particular an average value, which serves as comparison information, can be determined by means of the processing device on the basis of several vibration information items recorded one after the other.

[0025] Furthermore, the method can provide at least a first and a second piece of reference information, wherein a first piece of wear information is output based on a comparison of the comparison value with the first piece of reference information, and a second piece of wear information is output based on a comparison of the comparison value with the second piece of reference information. This allows for staggered information output, for example, information that the system is functioning correctly, followed by a first warning when wear is detected, and a second alarm when wear is excessive. This can be implemented in the form of a color-coded traffic light system.

[0026] Furthermore, the method can provide for a plurality of vibration sensors arranged at different positions, with the processing device determining the wear information based on the vibration information from the plurality of vibration sensors. This allows for redundancy as well as a corresponding cross-comparison or verification of the determined wear information.

[0027] Finally, it can be provided that a guillotine shear comprising a vertically movable upper blade as the first blade element and a position-fixed lower blade as the second blade element, or a roller shear comprising a horizontally movable roller blade and a position-fixed blade bar along which the roller blade moves, or a slitter comprising a movable first roller blade and a position-fixed second roller blade is used as the cutting device.

[0028] Further advantages and details of the invention will become apparent from the exemplary embodiments described below and from the drawings. These show: Fig. 1 a schematic diagram of a cutting device according to the invention in the form of guillotine shears, Fig. 2 the cutting device Fig. 1 in a side view, Fig. 3 an enlarged schematic diagram of the knife system with associated vibration sensors, Fig. 4 a schematic representation of the temporal course of different vibration information in the form of a curve representation with mean value curve, Fig. 5 a schematic diagram of a cutting device according to the invention in the form of a slitter, Fig. 6 a schematic diagram of a cutting device according to the invention in the form of a roller shear, Fig. 7 a schematic diagram of a cutting device according to the invention in the form of a guillotine shear corresponding Fig. 1 showing different positioning options for vibration sensors, and Fig. 8 the cutting device Fig. 7 in a side view.

[0029] Fig. 1 shows a schematic diagram of a cutting device 1 according to the invention in the form of a guillotine shear 2 in a front view, while Fig. 2 the cutting device 1 from Fig. 1 in a side view. The cutting device 1 comprises a device frame 3, comprising an upper knife 4 arranged on a first knife carrier 5, which is received in lateral knife carrier guides and is vertically movable via an actuator, as indicated by the double arrow P1. It can thus be moved from a raised position to a lowered cutting position, in which the cutting of the conveyed strip material takes place.

[0030] This cut is performed by the interaction of the upper blade 4 with a lower blade 6, which is arranged in a fixed position on a second blade carrier 7, which is, for example, a table top 8, wherein this second blade carrier 7 is arranged in a fixed position on the device frame 3. This means that the lower blade 6 is fixed in position, while the upper blade 4 is vertically movable relative to it. The upper blade 4 and the lower blade 6 are slightly spaced apart from each other by a cutting gap 9, as Fig. 3, which shows an enlarged partial view of this knife system.

[0031] During operation, the strip material to be cut is pulled between the upper blade 4 and the lower blade 6 via a suitable transport device comprising a pulling device with a suitable gripper mechanism. The strip material is fixed in a cutting position, after which the upper blade 4 is moved vertically downwards and, in cooperation with the lower blade 6, cuts the strip material. The cut strip section is then transported away and another section of the strip material is pulled through again after the upper blade 4 has been raised. Cutting takes place at a relatively high frequency, i.e., a plurality of cuts are made per minute, which represents a corresponding load, in particular for the upper blade 4 and the lower blade 6 as well as their correct positioning across the cutting gap 9 relative to one another. Over time, wear can occur, either on the upper blade 4 or the lower blade 6 itself, i.e.that their cutting edges wear out, or in relation to the originally defined setting of the width of the cutting gap 9, this can become smaller or larger during operation.

[0032] With each cut of the strip material, minimal vibrations occur, triggered by the interaction of the upper blade 4 with the lower blade 6 in connection with the strip material. These vibrations originate from the two blade elements and are coupled via these into the two blade carriers 5, 7 or into the setup frame 3. These vibrations are short-term, high-frequency vibrations in the kilohertz range. If the upper blade 4 and the lower blade 6 are not worn and the cutting gap 9 is optimally adjusted, very weak vibrations with a small vibration amplitude arise from a central peak, i.e., there is only a slight vibration acceleration of the components involved. With increasing wear, however, the vibration behavior or the vibration curve during a cut, i.e., the vibration spectrum, changes. It will usually intensify, i.e.The vibrations become more intense, the vibration spectrum exhibits larger amplitudes and a corresponding distortion or blurring with multiple peaks over a wider frequency range. This means that the vibration behavior and thus the detectable vibration information changes with increasing wear, so that the degree of wear can generally be determined from the detectable vibration information.

[0033] For this purpose, two vibration sensors 10, 11 are provided in the example shown, with the vibration sensor 10 being arranged on the first blade carrier 5 while the second vibration sensor 11 is arranged on the second blade carrier 7. Each vibration sensor 10, 11 delivers a corresponding sensor signal that is continuously supplied and exhibits a signal increase immediately at the start of the cut, i.e., when the two blade elements and the strip material interact. The sensor signals recorded for the respective cut, i.e., the vibration information, are sent to a processing device 12, which is configured to process the vibration information or sensor signals using a stored processing algorithm and, based on the recorded sensor signals, to determine wear information that reflects the degree of wear.

[0034] For this purpose, the processing device is set up to compare the vibration information, for example directly from the supplied sensor signal, with reference information. This reference information stored in the processing device 12 can be designed accordingly, depending on the type of vibration information. Each stored reference information item previously recorded for the specific cutting device or this type is assigned to a specific wear condition. The processing device then compares, for example, the vibration information in the form of a signal curve with reference information, which is also a signal curve. The reference information is stored in the processing device 12 with a large number of other reference information items assigned to different wear conditions and operating or material parameters, i.e., a corresponding set of information is available for comparison.Depending on the best match of the vibration information to be compared, the degree of wear can be determined from the corresponding reference information, i.e., wear information can be determined. This wear information is displayed on a display device 13, which may be, for example, a monitor with a color display option. Depending on whether the wear information indicates no wear, tolerable but already incipient wear, or more severe or severe wear requiring action, one of three light signals 14, 15, 16 can be emitted.If there is no wear, for example, light signal 14 will illuminate green. If there is incipient but tolerable wear, light signal 15 will illuminate yellow as a warning signal. If there is severe wear requiring immediate action, light signal 16 will illuminate red as an alarm signal. It is thus a kind of traffic light system.

[0035] Since two vibration sensors 10, 11 are provided, the processing device can process both separately and perform a comparison in each case, so that two results to be compared are obtained, whereby one comparison can be used as a leading comparison and the other comparison can be used for plausibility check.

[0036] The vibration information can be recorded for each individual cut, and a corresponding comparison can be made for each cut, thus determining wear information. However, it is also conceivable to do this only intermittently, for example only every 10th, 20th, 50th, or 100th cut. It is also conceivable to record the signals at staggered times, for example every minute, every 5 minutes, etc. In this case, it is conceivable to record and evaluate the vibration signals of several, for example five, immediately consecutive cuts for each signal recording cycle and, based on this, to determine a common measured value, for example determined by averaging, which serves as the vibration information for the comparison. This means that a variety of evaluation options are available.

[0037] Fig. Figure 4 shows an example of a curve overlaid on a multitude of individual recorded vibration information items, along with an associated mean value curve. The measurement number is plotted along the abscissa, and the respective maximum amplitude of the measured vibration or the maximum vibration acceleration within the measured vibration is plotted along the ordinate. It is assumed that for each measurement, either the respective maximum amplitude of the vibration, i.e., the maximum peak, or a maximum vibration acceleration is determined from the respective sensor signal as vibration information, which is then compared with the reference information. Fig. In Figure 4, several such vibration information items S1-S6 are marked, which are selected only as examples. Overall, a curve K results, which is laid out along the individual vibration information items.

[0038] Also shown is a mean curve M, which is determined by averaging along the curve K.

[0039] Furthermore, a first piece of reference information R1 is shown in the form of a dash-dotted line running horizontally, as is a second piece of reference information R2 in the form of a dashed line, which also runs horizontally. The reference information R1 indicates a first information level, the reference information R2 a second information level. Each recorded piece of vibration information, i.e. each amplitude value or acceleration value, is compared with the reference information R1 and R2. Depending on the comparison result, one of the three pieces of light information is output. The two pieces of reference information R1 and R2 therefore represent separate information limits. The reference information R1 is a warning limit. If this level is reached, a warning information is output in the form of the yellow light signal 15. The reference information R2 is an alarm limit, i.e. if this level is reached, an alarm information is output in the form of the red light signal 16.Below the reference information R1, the green light signal 14 is given, indicating proper operation.

[0040] As described, curve K is determined based on the individual pieces of sensor information, i.e. it follows their course. The individual pieces of sensor information can be seen, which vary relatively, i.e. the respective sensor information determined can and does differ from measurement to measurement, resulting in the relatively jagged course of curve K. While most of the sensor information at the beginning of the curve is smaller than the first reference information R1, sensor information S1 and S2, for example, lie above the reference information R1, which, if only this pure value were taken into account, would result in the corresponding output of warning information. To avoid this, since this is only a snapshot in time, the mean value curve M is determined, which runs significantly below the reference information R1.

[0041] Fig. Figure 4 also shows that over time, with increasing measurement number, the mean value curve M increases. With the acquisition of sensor information S3, a mean value is obtained that is equal to or greater than the reference information R1, which leads to a change from the previously displayed green light signal 14 to the yellow light signal 15. This indicates that considerable wear has now occurred, which may require pre-planning an intervention. As the figure shows, the vibration information then increases fundamentally, as exemplified by vibration information S4 and S5, which leads to the mean value curve M also increasing.When sensor information S6 is recorded, the mean value is equal to or greater than the second reference information R2, which results in the third, red light signal 16 being emitted, indicating that the fastest possible action is required because severe wear has occurred, which can be countered either by adjusting the cutting gap 9 or by changing the blade. An alarm signal is therefore emitted. In the example, this is responded to quickly, as shown by the drop in curve K and also in the mean value curve M. This means that the point in time at which wear becomes intolerable can be detected with high precision and, as a result, immediate action can be initiated, namely at the onset of this condition. Because the yellow warning signal was emitted beforehand, it was possible to prepare for this moment and have appropriate measures in place.

[0042] The cutting device 1 as described above is a guillotine shear, also called a shear. Fig. Figure 5 shows an example of a cutting device 1 according to the invention, which is designed as a slitter, which allows an endless strip material to be separated longitudinally into two partial strips. Shown is a first knife element in the form of a first roller knife 17, which is movable on a first knife carrier 18, which is horizontally movable on the device frame, which is not shown in detail here, wherein the first knife carrier is, for example, an adjusting plate. Furthermore, a second knife element is provided in the form of a second roller knife 19, which is arranged on a fixed second knife carrier 20. Both rotate in opposite directions, as shown by the arrows P2 and P3. A strip material runs, as shown by the arrow P4, from above between the two roller knives 17, 19 and is cut into two partial strips, as shown by the arrows P5, P6.

[0043] This also results in corresponding oscillations and vibrations, which are again detected by two vibration sensors 21, 22, which are arranged here on the two knife carriers 18, 20, and transmitted to the processing device, which is not shown in detail here. The processing method is as described above for the first example.

[0044] Fig. Figure 6 shows an embodiment of a cutting device 1 according to the invention in the form of a rotary shear. A first blade element is provided in the form of a rotary blade 23, which is arranged on a first blade carrier 24. The blade carrier 24 is horizontally movable, as indicated by the double arrow P7; the rotary blade 23 rotates clockwise here, as indicated by the arrow P8.

[0045] A second knife element is provided in the form of a fixed knife bar 25, which is arranged in a fixed position on a frame support 26, which serves as a second knife carrier, again for example a table top. The strip material is also pulled through here when the roller knife 23 is in the starting position shown here on the left. Upon reaching the cutting position, the strip material is fixed, the roller knife 23 is moved over the knife carrier 24 to the right into the position shown in dashed lines, during which movement the strip material is cut by the interaction of the roller knife 23 with the knife bar 25. Subsequently, the strip material is pulled through again, wherein the roller knife 23 is moved back from the dashed position, cutting the strip material in the process. Alternatively, before the next cut, the roller knife 23 can also be moved back into the position shown in Fig. 6 shown starting position.

[0046] Here, too, two vibration sensors 27, 28 are provided. A first vibration sensor 27 is attached to the first blade carrier 24, and a second vibration sensor 28 is arranged on the frame carrier 26. Here, too, they communicate with a processing device (not shown in detail), which in turn processes the sensor signals to determine the sensor information and to perform the comparison to determine wear.

[0047] The Fig. 7 and Fig. 8 show an embodiment of a cutting device 1 according to the invention, which is similar to the guillotine shears from the Fig. 1-3 corresponds.

[0048] Shown again are the setup frame 3, the upper knife 4 with its first knife carrier 5, and the lower knife 6 with the frame carrier 7. Also shown are the knife carrier guides 29 on both sides, in which the first knife carrier 5 is guided vertically on the setup frame 3. The two vibration sensors 10, 11 are shown again.

[0049] In addition, a number of different positions are indicated by the dashed sensor symbols, where either the two vibration sensors 10, 11 can be positioned alternatively, or where additional vibration sensors can be arranged, all of which provide separate sensor signals. Naturally, all vibration sensors are connected to the processing device 12, which performs the corresponding signal evaluation and to which the display device 13 is assigned.

[0050] In principle, it is conceivable to derive from the wear information how an appropriate response can be made, for example, when the first warning level is reached, i.e., a certain level of wear is detected and this condition persists over an extended period. For example, it would be conceivable to readjust the cutting gap 9 if its detectable width during operation is no longer within the tolerance. This adjustment can be performed automatically, i.e., the cutting gap 9 can be automatically readjusted depending on the wear result. The success of this measure can be directly verified based on the next measurements regarding the cutting quality. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2013 103 082 U

[0002]

Claims

[1] Cutting device for cutting a band-shaped material, in particular an adhesive cord, comprising two knife elements (4, 6, 17, 19, 23, 25) cooperating with one another for cutting, each knife element (4, 6, 17, 19, 23, 25) being arranged on a knife carrier (5, 7, 18, 19, 24, 26), which in turn is arranged directly or indirectly on a device frame (3), characterized bythat at least one vibration sensor (10, 11, 21, 22, 27, 28) is provided, via which vibration information which is a measure of a vibration of the knife elements (4, 6, 17, 19, 23, 25) generated by the interaction of the knife elements (4, 6, 17, 19, 23, 25) during a cut can be detected, and that a processing device (12) set up to determine wear information indicating the state of one or both knife elements (4, 6, 17, 19, 23, 25) on the basis of the vibration information and a display device (13) for outputting the determined wear information are provided. [2] Cutting device according to claim 1, characterized by that the processing device is set up to determine the wear information on the basis of a comparison of the vibration information or comparison information determined on the basis thereof with at least one reference information (R1, R2). [3] Cutting device according to claim 2, characterized by that the processing device is set up to determine a comparison value, in particular an average value, which serves as comparison information, on the basis of several vibration information items recorded one after the other. [4] Cutting device according to claim 2 or 3, characterized by that at least a first and a second reference information item (R1, R2) is provided, wherein a first piece of wear information item can be output as a function of a comparison of the comparison value with the first reference information item (R1) and a second piece of wear information item can be output as a function of a comparison of the comparison value with the second reference information item (R2). [5] Cutting device according to one of the preceding claims, characterized bythat a plurality of vibration sensors (10, 11, 21, 22, 27, 28) arranged at different positions are provided, wherein the processing device (12) is set up to determine the wear information on the basis of the vibration information of the plurality of vibration sensors (10, 11, 21, 22, 27, 28). [6] Cutting device according to one of the preceding claims, characterized by that a vibration sensor (10, 11, 21, 22, 27, 28) is arranged on a knife carrier (5, 7, 18, 19, 24, 26) or on the device frame (3). [7] Cutting device according to one of the preceding claims, characterized bythat an upper knife (4) is provided as a first knife element, which is arranged on a vertically movable first knife carrier (5), and a lower knife (6) is provided as a second knife element, which is arranged on a frame carrier provided on the device frame, is fixed in position and serves as a second knife carrier (7), wherein a vibration sensor (10) is arranged on the first knife carrier (5) or on a knife carrier guide (29) provided on the device frame or on the frame carrier (7). [8] Cutting device according to claim 7, characterized by that at least one first vibration sensor (10) is provided on the first knife carrier (5) or the knife carrier guide (29) and at least one second vibration sensor (11) is provided on the frame carrier (7). [9] Cutting device according to claim 8, characterized bythat a plurality of first vibration sensors (10) are provided on the knife carrier (6) or the knife carrier guide (29) and / or a plurality of second vibration sensors (11) are provided on the frame carrier (7). [10] Cutting device according to one of claims 1 to 6, characterized by in that a roller knife (23) is provided as the first knife element, which is arranged on a horizontally movable first knife carrier (24), and a position-fixed knife bar (25) is provided as the second knife element, which is arranged on a frame carrier (28) provided on the device frame (3), which is position-fixed and serves as a second knife carrier and along which knife bar (25) the roller knife (23) is movable, wherein a vibration sensor (27) is arranged on the first knife carrier (24) or on a guide provided on the device frame (3) for the first knife carrier (24) or on the frame carrier (26) or on the device frame (3). [11] Cutting device according to one of claims 1 to 6, characterized by in that a first roller knife (17) is provided as the first knife element and a second roller knife (19) is provided as the second knife element, wherein the first roller knife (17) is arranged on a first knife carrier (18) which is arranged such that it can move on the device frame (3) and the second roller knife (19) is arranged on a second knife carrier (20) which is arranged in a fixed position on the device frame (3), wherein a vibration sensor (21, 22) is arranged on the first knife carrier (18) or on a guide of the first knife carrier (18) provided on the device frame (3) or on the second knife carrier (20) or on the device frame (3).

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