Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/84—Systems specially adapted for particular applications
  • G01N21/88—Investigating the presence of flaws or contamination
  • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
  • G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
  • G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
  • G01N21/8983—Irregularities in textured or patterned surfaces, e.g. textiles, wood for testing textile webs, i.e. woven material
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/84—Systems specially adapted for particular applications
  • G01N21/88—Investigating the presence of flaws or contamination
  • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
  • G01N21/8901—Optical details; Scanning details
  • G01N21/8903—Optical details; Scanning details using a multiple detector array

Definitions

• the present invention relates to a device for monitoring a moving material web on a textile machine, a textile machine containing this device and a
• the signals are evaluated in an external processor, either a personal computer (PC) connected to the textile machine or a central computer to which a few textile machines are connected via a data network.
• PC personal computer
• Both solutions have disadvantages. Equipping every textile machine with its own PC entails high costs. In addition, it may be difficult to accommodate a PC in the textile machine due to lack of space. These disadvantages are eliminated when using a central computer, but very few web halls are equipped with a data network. The installation of such a data network is in turn associated with high costs.
• the device should in particular be inexpensive. It should also be compact and space-saving and have a long service life of several years in continuous operation. In addition, it should be scalable in that the number of optoelectronic elements and the computing power can be adapted to the needs of the respective textile machine.
• Another object of the invention is to provide a textile machine in which the web can be monitored automatically without having the disadvantages of the prior art. Furthermore, a method for operating such a device is to be specified.
• the invention is based on the idea of performing the complete data processing or signal evaluation decentrally, at the lowest level, in the monitoring device itself.
• the device according to the invention thus functions as an autonomous evaluation unit directly on the textile machine.
• external computers assigned to the textile machine, data networks etc. are waived.
• the optoelectronic, electronic and / or electrical elements used in the device are, if possible, standard components available on the market.
• the device is constructed as simply as possible so that it only contains the elements that are really required for its function.
• the device has a modular structure.
• the modular structure allows, on the one hand, to offer a very simple and inexpensive version of the monitoring device, which contains only a minimum of modules, for undemanding user needs, and, on the other hand, to expand this minimal version with additional modules and thus increase the scanning width and the computing power depending on user needs , Thanks to the modular structure and the geometric scalability, it is possible to optimally adapt the device to the respective circumstances, which also means that the costs can be scaled.
• the modular structure means that the cost of the device increases approximately in proportion to its length.
• the device according to the invention for monitoring a material web moving along a direction of movement on a textile machine, in particular on a weaving machine or on a winding device for product inspection has a housing. At least one line sensor is mounted in the housing in such a way that it is used to scan the web along its width suitable is. At least one analog / digital converter for converting an analog sensor signal of the at least one line sensor into a digital sensor signal is also mounted in the housing. Furthermore, a digital electronic circuit for processing the digital sensor signal into a configurable, action-triggering output signal is mounted in the housing.
• the action-triggering signal can be an action related to the web, such as. B. triggering errors, ignoring an error, turning off a drive for the web and / or initiating an optical and / or acoustic alarm.
• a device according to the invention is attached to the textile machine according to the invention, in particular a weaving machine, large dock or wrapping device for goods inspection, in which a web of goods can be moved along a direction of movement such that the web of goods can be monitored by the device.
• Production-specific parameters are e.g. B. the technical data of the textile machine, the pattern, the types of yarn, the number of warp and weft threads per unit length etc., and this for each of the weaving machines.
• the production-specific setting variables can also include parameter limit values characterizing an error, error categories, parameter ranges characterizing an error category and / or an action-triggering signal assigned to an error category. The type and appearance of the defects and the reaction of the device to a detected defect depend on the production-specific setting parameters.
• Production-specific setting variables are therefore required in the device for signal evaluation according to the invention. Since the device is deliberately simple and designed to process only the most necessary data, it could not manage all the production-specific setting parameters. According to the method according to the invention, therefore, only the part of the production-specific setting parameters required in each case is transmitted from the central processing unit to the respective monitoring device.
• the transmission can e.g. B. by hand using an interchangeable, changeable data carrier, preferably a chip card with an integrated microprocessor and memory, into the monitoring device.
• production-specific setting variables are managed in a central processing unit. The part of these production-specific setting variables required by the device is transferred from the central processing unit to the device. This part of the production-specific setting variables is used in the device for processing the digital sensor signal into the action-triggering output signal.
• the production-specific setting parameters or parts thereof relating to the errors can be fed into the central processing unit in various ways. Images of errors can, for example, be loaded into the central processing unit from a database, from a portable scanning device or from a data network. The corresponding parameter limit values and / or parameter ranges can be generated manually or automatically on the central processing unit.
• FIG. 1 shows a block diagram of a simple embodiment of the device according to the invention
• FIG. 2 shows a block diagram of an expanded embodiment of the device according to the invention and 3 shows the method according to the invention for operating the device according to the invention.
• FIG. 1 is a schematic block diagram of a simple embodiment of the device according to the invention
• the device 1 is used to monitor a moving web 100 on a textile machine.
• the direction of movement of the web 100 is indicated by an arrow 101.
• the device 1 has a housing 2 (indicated only very schematically in the drawing), which generally has an elongated shape, the extent transverse to the direction of movement 101 being greater than in the two other spatial directions. (This property of the housing 2 cannot be seen from the schematic illustration in FIG. 1 for reasons of clarity.)
• the housing 2 (indicated only very schematically in the drawing), which generally has an elongated shape, the extent transverse to the direction of movement 101 being greater than in the two other spatial directions. (This property of the housing 2 cannot be seen from the schematic illustration in FIG. 1 for reasons of clarity.)
• the housing 2 is preferably made from a profile section which is approximately long and approximately the width of the material web and which has an at least approximately U-shaped cross section.
• the fourth wall of the housing 2, which is directed towards the web 100, is preferably made as a sandwich construction from a simple wall of the U-profile section, which is perforated with sensor windows, and a transparent layer of glass or plastic attached underneath.
• the housing 2 can be attached directly or indirectly to the textile machine.
• the housing 2 (not shown) preferably has protruding retaining bolts on both sides, which hold arms (not shown) attached to the textile machine can be stored.
• the housing 2 can be fastened directly to the textile machine, which results in a “hard” mechanical coupling between the textile machine and the housing 2.
• the means for fastening the housing 2 to the textile machine can also be equipped with shock-absorbing elements in order to remove the housing 2 as far as possible Disconnect the textile machine and keep vibrations caused by the textile machine away from the device 1.
• shock-absorbing elements for reasons of space saving, simplicity and cost savings, direct attachment without shock-absorbing elements seems to be the preferred one; the vibrations transmitted to the device 1 can be at least partially electronic and / or The device 1 is preferably arranged directly above the web 100 or in contact therewith.
• At least one line sensor 31.1-31.3 is mounted in the housing 2 in such a way that it is suitable for scanning the web 100 along its width, ie transversely to its direction of movement 101.
• the at least one line sensor 31.1-31.3 is arranged essentially perpendicular to the direction of movement 101.
• the line sensors 31.1-31.3 are optoelectronic line sensors for optically scanning the web 100 and can be, for example, in charge-coupled device (CCD) or complementary metal oxide semiconductor (CMOS). Technology.
• CMOS complementary metal oxide semiconductor
• Optoelectronic line sensors 31.1-31.3 known from scanners with a resolution of, for example, 600 dpi or a pixel length of approx. 25 ⁇ m and a total length of approx. 250 mm can be used.
• other types of sensors can also be used, for example capacitive line sensors.
• the device 1 has three optoelectronic line sensors 31.1-31.3, the scanning areas of which overlap in order to avoid blind spots along the width of the web 100.
• the device 1 is preferably operated in incident light, light sources known per se, not shown in the drawing, such as light-emitting diodes (LED) arranged in rows, being used to illuminate the web 100.
• a line sensor 31.1 and the associated light sources are preferably arranged on a common printed circuit board and together form an optical contact scanning module 3.1, which is referred to as a "Contact Imaging Sensor" (CIS).
• CIS Contact Imaging Sensor
• the device 1 according to the invention can alternatively in transmitted light or simultaneously in incident light and Depending on the application, one of these alternatives can be selected, which gives the device 1 versatility and reliability in monitoring.
• a speed sensor 32 for measuring the speed of movement of the web 100 can optionally be fitted in the housing 2. It is advantageous to distribute a plurality of speed sensors 32 over the width of the web 100 because the speed of movement can differ locally.
• a speed sensor 32 is preferably assigned to three line sensors 31.1-31.3. Depending on the suitability, however, the line sensors 31.1-31.3 themselves can also take on the task of speed measurement, which makes separate speed sensors 32 superfluous.
• the speed sensor 32 can also be used as a position sensor.
• the line sensors 31.1-31.3 and speed sensors 32 preferably used in the device 1 according to the invention manage completely without any moving parts. This gives the device 1 high reliability and a long service life.
• At least one analog / digital converter 41 is installed in housing 2. As in the exemplary embodiment in FIG. 1, this can have a plurality of, for example three, input channels. Analog / digital converter 41 with three inputs are well developed and too relative in trade Favorable prices available because they are used in large numbers in digital color cameras for the A / D conversion of the pixel signals for the basic colors red (R), green (G) and blue (B). In the present case, no color information is required, so that the three inputs of the A / D converter 41 can be used for the sensor signals of the three scanning modules 3.1-3.3. This also explains why it is considered to be particularly advantageous to equip the device 1 according to the invention with a number of line sensors which is a multiple of three.
• the digital output signal of the A / D converter 41 can be fed to a local digital processor element 43, for example a digital signal processor (DSP).
• DSP digital signal processor
• This can take the first steps for processing the sensor signals. For example, he can correct image distortions such as tremors, possibly using an output signal from the speed sensor 32, and / or make individual brightness corrections for individual pixels.
• a local programmable logic module 42 e.g. B. a field programmable logic device (Field Progra mable Gate Array, FPGA) may be provided.
• the digital sensor data possibly preprocessed by the local digital processor element 43, are fed to this.
• An alternative embodiment of the device 1 according to the invention manages without a local digital processor element 43; in this case, the tasks of the local digital processor element are carried out by the local FPGA 42.
• the D / A converter 41, the local FPGA 42 and the local digital processor element 43 are preferably arranged on a local input module (LIM) 4.
• the local input module 4 carries out a first processing of the sensor signals and controls the three scanning modules 3.1-3.3. and any speed sensors 32 that may be present.
• a digital electronic evaluation circuit 5 for processing the digital sensor signals into an action-triggering output signal is mounted in the housing 2.
• the evaluation circuit 5 is preferably implemented on a base circuit board and connected to the local input module 4 via an input line 51.
• the input line 51 opens into a logic element 52, for example a second field programmable logic module (FPGA).
• FPGA field programmable logic module
• the main task of this second FPGA 52 is to control various local input modules if there are several of them (cf. FIG. 2).
• the heart of the evaluation circuit 5 is a digital processor element 53, for example a digital signal processor, for signal evaluation.
• a memory unit 54 is connected to the processor element 53.
• the storage unit 54 can have a read and write memory (Random Access Memory, RAM) 55 and / or a read-only memory (ROM) 56, preferably a rewritable read-only memory such as a flash-erasable programmable read-only memory (FEPROM) , Furthermore, the evaluation circuit can include a real-time clock (RTC) 57, which is preferably connected to the second FPGA 52. This is used to continue timing even when the device 1 is without a power supply. In this way, an absolute time can be assigned to the recorded production and quality data and, if necessary, output to a central processing unit (see FIG. 3).
• RTC real-time clock
• the scanning modules 3.1-3.3, the local input module 4 and the evaluation circuit 5 can be mounted one above the other and / or next to one another in the housing 2 on separate circuit boards.
• the evaluation circuit 5 evaluates the sensor signals using a suitable program. For this purpose, firstly, if there are several scanning modules 3.1-3.3 and in particular several local input modules 4.1-4.5 (cf. FIG. 2), it assembles an entire image line from the sensor signals. Second, the evaluation circuit 5 can derive values for preselected parameters from the sensor signals. Such parameters can e.g. B. length, width, contrast, intensity, diameter, direction, etc. For the values the parameters are predetermined and are stored, for example, in the storage unit 54. Furthermore, ranges of values for the values of the parameters can also be predetermined and stored, for example, in the storage unit 54, which define different categories of errors. Such categories can e.g. B. warp errors, weft errors, surface defects or edge defects. The distribution of the errors in the web 100 can be determined for the categories of the errors.
• Such parameters can e.g. B. warp errors, weft errors, surface defects or edge defects.
• the evaluation circuit 5 Depending on the determined category and / or the distribution of the errors in the web 100, the evaluation circuit 5 generates and sends out an action-triggering signal which can trigger an action in connection with the web 100.
• an action can e.g. B. counting the errors, ignoring the error, turning off a drive for the web 100 or triggering an optical and / or acoustic alarm.
• the action-triggering signal can be output to an operating unit 110.
• the control unit 110 preferably contains output means (not shown), for example a liquid crystal display (LCD) and / or input means, for example a keyboard. It can be attached to the housing 2, preferably to the side of the web 100, or used as an independent unit connected to the evaluation circuit 5 by means of appropriate interfaces via cable or radio.
• the control unit 110 can have an interface (not shown) for a chip card with an integrated microprocessor and memory (smart card) for identifying an operator and / or for entering production-specific setting parameters (cf. FIG. 3).
• the action-triggering signal can also be output directly to a control unit 120 of the textile machine in question, for example to stop the textile machine.
• the control unit 120 can also be connected to a data network 130 such as e.g. B. Ethernet connected.
• the evaluation circuit 5 with a data network 130 such as e.g. B. Ethernet to send the action-triggering signal to this data network 130.
• a suitable expansion card (extension board) 6 connected to the evaluation circuit can be present as an interface for this purpose.
• the expansion card 6 can be connected to the same or a different data network 130 as the control unit 120, if applicable.
• the control unit 110 and the data network 130 can be used not only for the output of the action-triggering signal, but also for data input.
• the device 1 can thus learn a new error by recording it with a portable scanner, this error one Error category and, if applicable, an error triggering signal is assigned to the error category.
• the parameter limit values characterizing the error, the parameter areas characterizing the category and the action-triggering signal can be read into the evaluation circuit 5 via the operating unit 110 or via the data network 130.
• the data transmission within the device 1 is preferably carried out in parallel via a 16 MHz bus.
• the device 1 can be equipped with a voltage supply module (not shown).
• the voltage supply module can be designed in such a way that, in the event of a current interruption, there is a command for storing the current data to the evaluation circuit 5.
• FIG. 2 shows an expanded embodiment of the device 1 according to the invention. Elements explained on the occasion of FIG. 1 are denoted by the same or analog reference numerals and are not discussed further here.
• the embodiment of FIG. 2 includes five local input modules 4.1-4.5, which are connected to a single evaluation circuit 5. Three contact scanning modules 3.1-3.3 are connected to each of the five local input modules 4.1.
• the device thus has a total of 15 Contact scanning modules 3.1-3.15. With a typical usable length of a contact scanning module 3.1 of approximately 20 cm, the device 1 can thus scan an approximately 3 m wide web 100 without gaps.
• the contact scanning modules 3.1-3.15 are preferably in direct contact with the web 100.
• a further expansion step, in which the number of evaluation circuits in the device 1 according to the invention is also increased, is possible in order to achieve an even greater monitoring range or more functionality. In this case, the coordination of the individual evaluation circuits must be ensured.
• FIG. 3 schematically shows the method according to the invention for operating the device according to the invention.
• textile machines 200.1-200.3 e.g. B. looms
• FIG. 3 schematically shows the method according to the invention for operating the device according to the invention.
• textile machines 200.1-200.3 e.g. B. looms
• FIG. 3 schematically shows the method according to the invention for operating the device according to the invention.
• textile machines 200.1-200.3 e.g. B. looms
• a monitoring device according to the invention 1.1-1.3 is mounted with an operating unit 110.1-110.3.
• monitoring devices 1.1-1.3 on the textile machines 200.1-200.3 are designed to be as simple and inexpensive as possible, they can only store the most necessary data and carry out the most necessary arithmetic operations or data evaluations.
• a central processing unit 300 is therefore preferably used to manage the large amount of production-specific setting variables needed. A respectively required part of the production-specific setting variables is transmitted 310.1 by the central processing unit 300 into the respective monitoring device 1.1.
• the transmission 310.1 of the production-specific setting variables into a monitoring device 1.1 can take place, for example, by means of the smart card mentioned on the occasion of FIG. 1.
• the central processing unit 300 and the monitoring devices 1.1-1.3 or the operating units 110.1-110.3 assigned to them are equipped with corresponding writing and / or reading devices (not shown).
• An operator can save the production-specific setting parameters for a specific textile machine 1.1 on a smart card at the central processing unit 300, use this smart card to go to the relevant textile machine 1.1 and store the setting values from the smart card in the monitoring device 1.1. With this simple solution, the expensive laying and maintenance of a data network can be avoided.
• the production-specific setting variables can also be transmitted by the central processing unit 300 into the individual monitoring devices 1.1-1.3 by other means, for example by means of a data network as indicated in FIGS. 1 and 2 by reference number 130.
• Images of errors can, for example, be loaded from a database 400 into the central processing unit 300.
• Such error databases 400 can e.g. B. are offered by the manufacturer of the monitoring devices 1.1-1.3.
• the textile machine operator can use a portable scanning device 500 in order to read in images of defects on site and to load them into the central processing unit 300.
• Images of errors can also be loaded from a data network 600 into the central processing unit 300.
• the corresponding parameter limit values and / or parameter ranges can be generated manually or automatically on the central processing unit 300.
• the device 1.1-1.3 also functions autonomously, without a central processing unit 300.
• a standard selection of production-specific setting variables relating to the errors can be stored in the device at the factory during the manufacture of the device.

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• Textile Engineering (AREA)
• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Wood Science & Technology (AREA)
• Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
• Treatment Of Fiber Materials (AREA)
• Looms (AREA)

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Citations (6)

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• 2005
  • 2005-02-25 EP EP05706529A patent/EP1725857A1/de not_active Withdrawn
  • 2005-02-25 CN CNA2005800071063A patent/CN1930467A/zh active Pending
  • 2005-02-25 WO PCT/CH2005/000110 patent/WO2005085813A1/de not_active Application Discontinuation
  • 2005-02-25 JP JP2007504233A patent/JP2007527016A/ja active Pending

Patent Citations (6)

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