EP2044430A2 - Method and arrangement for determining the yarn quality and/or spool quality of a running thread based on laser-doppler anemometry - Google Patents
Method and arrangement for determining the yarn quality and/or spool quality of a running thread based on laser-doppler anemometryInfo
- Publication number
- EP2044430A2 EP2044430A2 EP07786359A EP07786359A EP2044430A2 EP 2044430 A2 EP2044430 A2 EP 2044430A2 EP 07786359 A EP07786359 A EP 07786359A EP 07786359 A EP07786359 A EP 07786359A EP 2044430 A2 EP2044430 A2 EP 2044430A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- yarn
- running
- speed
- laser beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 134
- 238000004599 local-density approximation Methods 0.000 title claims abstract description 35
- 238000004804 winding Methods 0.000 claims abstract description 68
- 238000005259 measurement Methods 0.000 claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 239000004753 textile Substances 0.000 claims abstract description 15
- 206010020112 Hirsutism Diseases 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims description 41
- 230000001133 acceleration Effects 0.000 claims description 17
- 238000011156 evaluation Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 208000000995 spontaneous abortion Diseases 0.000 description 2
- 240000002129 Malva sylvestris Species 0.000 description 1
- 235000006770 Malva sylvestris Nutrition 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000035559 beat frequency Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
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
- G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
- G01N21/8915—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined non-woven textile material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/40—Applications of tension indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H61/00—Applications of devices for metering predetermined lengths of running material
- B65H61/005—Applications of devices for metering predetermined lengths of running material for measuring speed of running yarns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/003—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to winding of yarns around rotating cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
- B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
- B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
- B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
- B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
- B65H63/0324—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using photo-electric sensing means, i.e. the defect signal is a variation of light energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
- B65H63/082—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle responsive to a predetermined size or diameter of the package
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/36—Textiles
- G01N33/365—Filiform textiles, e.g. yarns
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
- G01P3/366—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light by using diffraction of light
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
- B65H2557/50—Use of particular electromagnetic waves, e.g. light, radiowaves or microwaves
- B65H2557/51—Laser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
- B65H2557/60—Details of processes or procedures
- B65H2557/65—Details of processes or procedures for diagnosing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Definitions
- the present invention relates to a method according to one of claims 1 or 4 or 25.
- Winding units of modern textile machines for example for the production of cheeses, are equipped with devices for speed measurement and length measurement of the running thread.
- Constantly increasing demands on the quality of the yarn have led to the monitoring of parameters of the yarn structure such as the yarn diameter not only at selected winding units, but at each individual winding unit.
- the length of the deviation is usually used to evaluate whether a deviation from the nominal yarn diameter is to be classified as a yarn defect.
- the determination of the exact defect length is therefore an essential part of the quality control of the yarn.
- Classic mechanical measuring methods for measuring the speed of the running thread work with rolling measuring wheels.
- friction is associated between the yarn and the surface of the measuring wheel.
- the friction of sensitive threads can lead to disadvantageous quality impairments.
- a device for measuring the speed of running textile threads on a winding device which operates according to the so-called correlation measuring method.
- the measured values of two sensors arranged one behind the other at a fixed distance in the direction of movement of the textile thread are evaluated by means of a time-of-flight correlator in order to determine the yarn speed therefrom.
- the two sensors work without contact and can, for example, operate on an optical or capacitive basis.
- LDA laser Doppler anemometry
- the basic principle of the LDA is based on the indirect measurement of the Doppler shift (shift of the light frequency) on moving scattering particles. It is a point-oriented non-contact optical process from laser measurement technology. With the Doppler effect, a frequency shift occurs, which depends on the relative speed with which the transmitter and receiver move relative to each other. By evaluating the frequency shift, it is thus possible to determine the velocity of a moving body when the receiver is stationary.
- the reference beam LDA method uses a reference beam and a measuring beam.
- the reference wave which is not shifted in frequency, and the reflected scattered light of the measuring beam shifted in accordance with the Doppler effect are superimposed in the receiver.
- the reference beam method in its hitherto known embodiment, however, has the property that the intensity of the reference beam and the intensity of the measuring beam reflected from the surface usually deviate significantly in the ratio 5:95, to a good "signal-to-noise ratio" receive.
- a laser beam is split by means of a beam splitter into two parallel partial beams of the same intensity. These sub-beams are then focused with an optic, in particular by means of a condenser lens. As a result, the two sub-beams are superimposed in the focal plane. The intersection is the measurement volume, in which the velocity of the particles is determined by measuring the scattered light.
- the scattered light is recorded by imaging optics using a photodetector and evaluated by suitable electronics.
- the imaging optics consists in the simplest case of a simple focusing lens. Depending on the structure, the optics can be extended with a shutter to shield the two partial beams and with a spatial filter.
- the object of the present invention is to provide a method of the kind set forth which can be carried out with little effort and with which the winding process and / or the quality of the wound yarn and / or the quality of the wound coil can be monitored and / or optimized.
- the yarn quality of a running yarn can be monitored without contact by means of a arranged in the yarn path of a textile machine sensor device and optionally optimized by a laser beam is generated by a light source by means of an optical part and steering means for dividing and steering the Laser beam is divided into at least two sub-beams, which are guided so that they meet again at the thread, wherein from the thread-influenced and / or reflected light according to the laser Doppler anemometry method generates measurement signals and the burst signals generated in this regard with respect to hairiness of the current thread are evaluated electronically.
- the hairiness of the running yarn for determining the yarn quality can be detected in a relatively simple manner.
- the burst signals (signal packets) generated by the LDA are caused primarily by the filament hairiness. If a large number of burst packets are generated at short intervals during the speed detection, it can be assumed that there is a high yarn hairiness. And accordingly, from a smaller number of burst packages, a lower amount of yarn hairiness can be deduced.
- the hairiness of the running thread is compared continuously with at least one specific predetermined or predeterminable marginal hairiness and that issued when reaching or exceeding this Grenzhaarmaschine a warning signal and / or automatically reduces the winding speed and / or the yarn tension and / / or the winding process is ended automatically.
- the quality of a coil which is obtained by winding a running thread, monitored by means of a arranged in the threadline of a textile machine sensor device and optionally optimized by a laser light source is generated by a light source by means of an optical part -
- And steering means for dividing and steering the laser beam is divided into at least two sub-beams, which are guided so that they meet again at the thread, wherein from the thread-influenced and / or reflected light according to the laser Doppler anemometry method (LDA method) measuring signals are generated, which are evaluated electronically to determine and / or improve the quality of the coil.
- LDA method laser Doppler anemometry method
- the speed of the running thread is determined from the generated measurement signals over at least one or more time intervals and a velocity profile is formed therefrom.
- the determination of the yarn speed according to the LDA method is known per se, for example, from DE 103 42 383 A1, to which reference can be made in this respect and to the contents of which reference is expressly made.
- the speed profile formed in the context of the present invention is referred to below as the derived measurement result. It can be used for various evaluations described in more detail below.
- the acceleration of the running yarn as a time derivative of the speed can advantageously be determined for at least one time interval.
- the acceleration will be below also referred to as a derived measurement result and it can also be used for further evaluations.
- the variance or the standard deviation of the velocity profile and / or the acceleration is formed.
- the variance or standard deviation is also referred to below as the derived measurement result and can be used for further evaluations.
- the speed profile can be compared with a predetermined desired speed profile and / or limit speed profile and / or the acceleration profile can be compared with a predetermined desired acceleration profile and / or limit acceleration profile.
- the variance may be compared with a desired variance and / or a marginal variance, or the standard deviation with a Soü standard deviation and / or a marginal standard deviation.
- individual comparisons alone as well as several comparisons can be carried out simultaneously or in succession. The automatically initiated reactions then depend on the results of the comparisons carried out.
- the evaluation of one of the aforementioned derived measurement results can also be carried out by a frequency analysis, wherein a signal is generated as a reaction or the winding process automatically is influenced or interrupted or terminated when the frequency profile determined in the analysis of the frequency deviates from a desired frequency profile in a predetermined or predeterminable extent and / or when the determined frequency profile approaches or approaches a limit frequency profile up to a predetermined or predeterminable level exceeds.
- a signal is generated as a reaction or the winding process automatically is influenced or interrupted or terminated when the frequency profile determined in the analysis of the frequency deviates from a desired frequency profile in a predetermined or predeterminable extent and / or when the determined frequency profile approaches or approaches a limit frequency profile up to a predetermined or predeterminable level exceeds.
- the velocity profile from the time domain is transformed into the frequency domain and then analyzed in the frequency domain.
- the measurement signals and / or one or more derived measurement results can be evaluated, for example, with regard to misdirections of the running thread on the spool and / or with regard to erroneous windings of the running thread on a drum (drum winding), in particular grooved drum, provided for driving the spool.
- drum winding drum winding
- this sensor Disadvantage of this sensor is that a shutdown can be determined only after the emergence of the roll from the drum and thus at a relatively late time.
- the LDA sensor used according to the invention can detect the malfunction very early on, so that it is possible to respond accordingly quickly.
- misdirections of the running yarn in particular drum windings, can be determined by analyzing the speed profile of the running yarn and / or the frequency of the speed profile.
- the winding process can also be terminated automatically with a no longer tolerable level of misguiding or drum winding.
- the measurement signals and / or one or more derived measurement results can advantageously also be evaluated with respect to the tensile load of the current yarn.
- the determination of the yarn tension is derived by calculating the yarn acceleration from the measured speed signal. If, for example, one determines the height of the noise level on the acceleration signal by calculating the standard deviation, then a measure of the yarn tensile force peaks results during the winding process.
- a warning signal is output and / or the pulling force acting on the thread and / or the winding speed is reduced and / or a Garnabzugbeschreiber adjusted and / or the winding process is terminated when the tensile load increases or a certain predetermined or exceeds predeterminable level, so as to avoid deterioration of the coil quality due to tensile forces peaks.
- the measurement signals can advantageously also be evaluated with respect to one or more diameters of a coil. If, for example, a cylindrical drum drives a conical coil, only a very limited zone results on the spool stroke, in which the peripheral speeds of the drum are identical to those of the spool. This neutral zone is also referred to as the driving or driving diameter.
- This diameter can conventionally be calculated by the ratio of reel speed to drum speed.
- a disadvantage of this method is that in diameter-stopped winding sections, in which the winding section is terminated when reaching a certain diameter, in the case of a conical coil, this driving diameter is calculated as a storage diameter. For the end user of the product coils, however, it is not this diameter that is of concern, but the conical outside diameter. Furthermore, it must be considered that the driving diameter, depending on the winding conditions, can be located in different positions and anywhere on the bobbin stroke between small and large bobbin diameter.
- the outer diameter and / or the inner diameter of a conical coil can be calculated directly at the reversal points of the threading by means of the highly dynamic speed measurement of the thread by means of an inventively used LDA sensor. This results in the following relationships:
- the bobbin rotational speed and ⁇ s pu i e which is preferably a arranged on the coil activators possible, can be determined very accurately so taking into account the Verlegehubs also the outer or inner diameter of the conical bobbin ,
- winding process is not only off when a certain diameter is reached, but that the exact position of the driving diameter can be output.
- the measurement signals can advantageously also be evaluated with respect to the density of the coil.
- the determination of the package density from the yarn count, the package geometry and the wound yarn length is a quality feature of the wound product. If, for example, the coil density varies greatly in a statistically comparable collective, then it can be assumed that the coil deviating from the collective can be described as having a lower thread tension and / or a too high contact pressure by the coil frame or other circumstances as reducing the quality.
- the evaluation result thus obtained can directly influence the winding process.
- information about the determined package density can be output and / or a warning signal can preferably be output if the package density exceeds a certain predetermined or predefinable limit value. It is also possible to change the thread tension and / or the winding speed automatically.
- the slippage between the drum and the coil which is specifically generated by a picture interference method, can be monitored. If the slip deviates from a certain target value or exceeds or falls below a certain limit value, a warning signal can be output and / or advantageously the image disturbance can be automatically corrected.
- the slip between the drum and the spool can be evaluated for an order of paraffin on the thread. If the coil angular velocity taken from the coil axis is used for the exact diameter determination via the above-described determination of the speeds at the reversal points, then the driving diameter of the conical coil can be used dynamically during the Winding process are recorded. Due to acceleration mechanisms (image disturbance) acting on the bobbin during winding operation, the position of the driving diameter will greatly migrate in the case of waxing, while without paraffin coating the position will remain relatively constant.
- a warning signal can be output and / or the winding process can be terminated automatically if the paraffin application deviates from a predefinable target value or falls below a predefinable limit value.
- the slip between the drum and the spool can be monitored when the spooling process starts up.
- the drive is preferably regulated to a predeterminable slip or to a predeterminable slip profile.
- the winding process is a discontinuous process that is interrupted several times (depending on the material and the bobbin diameter more than 40 times) due to the bobbin patterns.
- Today's trend to steadily increase winding speeds (currently to 1800m / min) sets a limit due to the recurring ramp-ups of the associated increase in production.
- One goal of the winder manufacturer is therefore to realize the fastest possible run-ups on the production speed and at the same time to keep the slip between the driving drum and the bobbin in a quantitatively predetermined limit.
- the slip between the drive drum and the bobbin can be accurately determined and regulated via the drum drive via the detection of the exact winding speed with simultaneous detection of the drum speed, so that the aforementioned goal of the greatest possible increase in production at the same time high Production quality can be optimally achieved.
- the quality of the coil production can be considered in terms of a possible breakage of the running thread and / or a possible pinching of the running thread between a spool, on which the thread is wound, and a drive roller driving the spool are monitored by means of a arranged in the threadline of a textile machine sensor device contactless and optionally optimized by a light source from a laser beam is generated by means of an optical part and steering Means for dividing and directing the laser beam is divided into at least two sub-beams, which are guided so that they meet again at the thread, being generated from the thread-influenced and / or reflected light according to the laser Doppler anemometry method measuring signals, which are evaluated electronically to determine a thread breakage and / or a Fadeneinklemmung.
- winding techniques use a drive or support roller in the coil drive, the drive thus takes place directly over the spool axis or via the drive roller.
- the thread laying is realized here via a separate unit.
- the winding process is automatically terminated when a break or entrapment of the yarn is detected. Furthermore, the error can then be corrected automatically via an additional circuit control (winding process interruption with subsequent connection process and coil start-up).
- the laser beam generated by the light source is divided and directed by means of a partial and steering device such that the two partial beams already at the exit from this part and steering device at an angle to each other directed run and intersect to form the measuring volume at the thread.
- the laser beam generated by the light source can be shared without focus by the part and steering device and the two partial beams can be focused focus on the thread.
- a one-piece wedge prism can be used, which is free of inner parting surfaces and contact surfaces.
- the laser Doppler anemometry method can be carried out both as a reference beam method and as a two-beam method, both of which are well known. It will however, it is proposed to carry out the LDA method preferably as a reference beam method since, when used according to the invention, it offers the advantage that the received speed signal is considerably more intense, so that significant savings in analog amplifier technology can be realized.
- the present invention further relates to an arrangement for carrying out a method of the type described above.
- An arrangement for the non-contact determination of the structure and / or the speed of a running thread in the yarn path of a textile machine comprising a light source for generating a laser beam, an optical Partial and steering device, by means of which the laser beam can be divided into at least two partial beams which can be brought together on the thread and deflected accordingly, as well as an optical sensor device, by means of which the light influenced and / or reflected by the thread is subjected to the laser Doppler anemometry.
- Measuring signals can be generated, which are supplied to determine and / or increase the quality of the running yarn and / or a wound coil and / or to determine a yarn breakage or a Fadeneinklemmung an electronic evaluation.
- the arrangement, in particular its evaluation unit, is advantageously designed such that it is suitable for carrying out the method according to the invention described above.
- the optical part and steering device is designed such that the exit of the two partial beams from this part and steering device so directed towards each other at an angle to that on the thread cross.
- the partial and steering device may be formed by a one-piece wedge prism.
- the two partial beams are directed in an advantageous manner focusing lens without focusing lens on the thread.
- Figure 1 a schematic representation of an arrangement for carrying out the method according to the invention as a two-beam method
- FIG. 2 shows a schematic representation of an arrangement for carrying out the method according to the invention as a reference beam method
- FIG. 3 shows a schematic representation of an alternative arrangement for carrying out the method according to the invention as a reference beam method.
- Figure 4 schematic representation of a conical coil which is driven by a drum
- FIG. 5 velocity profile of a thread when properly laid on a spool
- FIG. 6 velocity profile of a thread during a faulty laying on a spool
- FIG. 8 shows the relationship between the thread tension and the standard deviation of the acceleration signal of one thread.
- a diode laser 1 in conjunction with a collimating optics 2 is used as the light source.
- the laser beam 3 generated thereby is directed with constant beam diameter onto a wedge prism 4 used as a part and steering device.
- the wedge prism 4 which is free of inner parting surfaces and inner contact surfaces, the laser beam 3 is divided in the manner described below into two sub-beams 5a and 5b, which on a winding unit 6 of a textile machine not shown in the direction of the arrow 7 running thread 8 are directed.
- a photodetector 9 and a receiving optics as the optical sensor device, which can in particular comprise collecting lenses 10 and / or diaphragms 11.
- the wedge prism 4 formed by an obliquely cut-off glass cuboid has a partially transparent front side 12 and a rear side 13 running obliquely thereto at an angle ⁇ which is also partially transparent in the two-beam method illustrated in FIG. 1 and fully mirrored in the reference beam method illustrated in FIGS. 2 and 3 is.
- the two partial beams 5 a and 5 b leave the front side 12 of the wedge prism 4 at an angle ⁇ directed obliquely toward one another, so that they intersect at the winding 8 in the region of the winding station 6.
- a focusing of the partial beams 5a and 5b, for example by a converging lens does not take place, so that in the region of the intersection of the two partial beams 5a and 5b, a very large measuring volume with a diameter of about 2 to 3 mm with a diameter of about 3 mm of the original laser beam 3 is obtained.
- a large measurement volume of the current thread 8 can be easily passed through, so that its structure can be reliably detected in the context of quality monitoring of the coiled yarn even when caused during the winding process irregularities.
- the laser light of the two partial beams 5a and 5b impinges on the winding unit 6 on the surface of the running thread 8 and is scattered by it.
- the laser beam 3 impinges obliquely on the partially transparent front side 12 of the wedge prism 4 at an angle ⁇ .
- a first partial beam 5a is reflected directly on the front side 12.
- This partial beam 5a has an intensity of approximately 5% of the intensity of the original laser beam 3.
- the nonreflected portion of the laser beam 3 passes through the front side 12 into the wedge prism 4 and is partially reflected on the likewise partially transmissive rear side 13.
- the portion reflected here again has an intensity of approximately 5% of the intensity of the original laser beam 3.
- This portion reflected on the rear side 13 emerges from the wedge prism 4 as a second partial beam 5b with refraction at the front side 12.
- the portion of the laser beam 3 which is not reflected on the rear side 13 of the wedge prism 4 emerges from the wedge prism 4 as residual beam 14 with a residual intensity of approximately 90% of the original intensity at the partially transmissive rear side 13 and does not continue to carry out the two-beam method needed.
- the exact ray path of the two partial beams 5a and 5b is calculated according to Snell's law:
- the rear side 13 of the wedge prism 4 is completely mirrored. Again, a first partial beam 5a with an intensity of about 5% of the intensity of the original laser beam 3 at the partially transparent front side 12 is reflected. The non-reflected portion emerges from the wedge prism 4 after reflection at the rear side 13 and subsequent refraction at the front side 12 as a second partial beam 5b with an intensity of approximately 94%.
- the first partial beam 5a forms the reference beam, which is detected by the photodetector 9 after passing through a receiving optical system formed by an aperture 11 and a converging lens 10.
- the second partial beam 5b forms the measuring beam which is necessary for generating the interference pattern or the beat frequency. After passing through the running thread 8, the measuring beam is no longer needed for the actual evaluation, so that it can be shielded by the aperture 11 of the photodetector 9.
- the beam splitting takes place under multiple reflection and refraction on the wedge prism
- a first portion 15 with an intensity of about 5% of the intensity of the original laser beam 3 is reflected on the partially transparent front side 12 and no longer needed to carry out the further process.
- the occurred in the wedge prism 4 remaining portion of the laser beam 3 is completely reflected on the mirrored back 13 and then strikes from the inside on the partially permeable front side 12, where the largest proportion as a first partial beam
- the first partial beam 5a forms the measurement beam or scattered beam with an intensity of approximately 90%
- the second partial beam 5b forms the reference beam directed onto the photodetector 9 with an intensity of approximately 4%.
- the wedge prism 4 divides the laser beam 3 respectively into two in-phase partial beams 5a and 5b, which are then brought to overlap so that they intersect in the region of the winding unit 6 on the current thread 8.
- FIG. 4 shows a conical bobbin 20 which is driven by a drum 21 designed here as a slot drum. In this case, the drive via the lying between the inner diameter 22 and the outer diameter 23 driving diameter 24.
- the current thread 8 is for
- FIGS. 7a to 7d show the influences on the yarn speed profiles and yarn accelerations measured by the LDA sensor device due to changed yarn tension influences of the wound yarn 8.
- FIGS. 7a and 7b relate to a low yarn tension, while FIGS.
- FIGS. 7a and 7c relate to an increased yarn tension.
- the yarn speed v is in each case over the time t
- the yarn acceleration a is plotted over the time t.
- Figure 8 shows the relationship between the yarn tension F and the standard deviation s of the acceleration signal of the thread 8.
- the pressure on the disk tensioner shows the friction force of a yarn brake and thus the yarn tension F on. It can be seen that an approximately linear relationship results.
- a wedge prism 4 does not necessarily have to be used as a part and steering device, but it is also possible, for example, to use correspondingly arranged mirror geometries with partially transparent entrance mirrors.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Power Engineering (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Electromagnetism (AREA)
- Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006035251A DE102006035251A1 (en) | 2006-07-26 | 2006-07-26 | Method and arrangement for determining the yarn quality and / or package quality of a running thread on the basis of laser Doppler anemometry |
PCT/EP2007/006643 WO2008012093A2 (en) | 2006-07-26 | 2007-07-26 | Method and arrangement for determining the yarn quality and/or spool quality of a running thread based on laser-doppler anemometry |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2044430A2 true EP2044430A2 (en) | 2009-04-08 |
Family
ID=38574954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07786359A Withdrawn EP2044430A2 (en) | 2006-07-26 | 2007-07-26 | Method and arrangement for determining the yarn quality and/or spool quality of a running thread based on laser-doppler anemometry |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2044430A2 (en) |
CN (1) | CN101501490B (en) |
DE (1) | DE102006035251A1 (en) |
WO (1) | WO2008012093A2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008004731A1 (en) * | 2007-09-28 | 2009-04-02 | Vienco Gmbh | Method and arrangement for determining the diameter of a running thread |
DE102008019012A1 (en) | 2008-04-15 | 2009-10-22 | Ferdinand Josef Prof. Dr. Hermanns | Method and arrangement for the highly accurate determination of the instantaneous winding speed of a running thread |
DE102009030246B3 (en) | 2009-06-23 | 2010-12-30 | Neumann Elektrotechnik Gmbh | Method and arrangement for non-contact determination of yarn tension values |
CN102906560B (en) * | 2010-03-04 | 2015-03-04 | 威克股份有限公司 | Method for detecting imperfections in a running thread having improved working point adjustment |
JP2014024652A (en) * | 2012-07-27 | 2014-02-06 | Murata Mach Ltd | Yarn winding device |
CN104101697A (en) * | 2013-04-10 | 2014-10-15 | 苏州华觉智能科技有限公司 | Detection device |
NO344472B1 (en) * | 2018-07-10 | 2020-01-13 | Stimline As | A winding apparatus |
CN109987453A (en) * | 2019-04-28 | 2019-07-09 | 国网山东省电力公司诸城市供电公司 | A kind of cable winding device |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE355608B (en) * | 1971-08-23 | 1973-04-30 | Nordiska Maskinfilt Ab | |
US3953128A (en) * | 1974-03-25 | 1976-04-27 | Atlantic Research Corporation | Process and apparatus for filament or slit size monitoring |
US4334779A (en) * | 1980-08-04 | 1982-06-15 | Canadian Patents & Dev. Limited | Non-contact optical apparatus for measuring the length or speed of a relatively moving surface |
US4697922A (en) * | 1986-03-31 | 1987-10-06 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Dual mode laser velocimeter |
DE3832984C2 (en) * | 1988-09-29 | 1997-04-24 | Akzo Gmbh | Method and device for indicating yarn breakage in yarn sheets |
GB9010862D0 (en) * | 1990-05-15 | 1990-07-04 | Rieter Scragg Ltd | Yarn quality grading method |
DE4225842A1 (en) * | 1992-08-05 | 1994-02-10 | Schlafhorst & Co W | Device for measuring the speed of textile threads on a winding device |
CN1047000C (en) * | 1993-04-29 | 1999-12-01 | 巴马格股份公司 | Method of diagnosing faults in a synthetic-yarn manufacturing process |
CH686779A5 (en) * | 1993-10-29 | 1996-06-28 | Luwa Ag Zellweger | Apparatus for checking the winding quality of yarn packages and use of the device at a spooling or spinning machine. |
JP3611140B2 (en) * | 1995-07-20 | 2005-01-19 | 計測器工業株式会社 | Yarn measuring device |
DE19605844A1 (en) * | 1996-02-16 | 1997-08-21 | Iro Ab | Device for deflecting a thread |
DE19625511A1 (en) * | 1996-06-26 | 1998-01-02 | Schlafhorst & Co W | Method and device for producing cross-wound bobbins in a wild winding |
DE19648713A1 (en) * | 1996-11-25 | 1998-05-28 | Stiftung Inst Fuer Werkstoffte | Determining diameter of cylindrical bodies or fluids with planar phase Doppler anemometer |
DE19824078C2 (en) * | 1998-05-29 | 2001-05-31 | Zinser Textilmaschinen Gmbh | Process for the production of compacted yarn and device therefor |
CN1403821A (en) * | 2002-07-16 | 2003-03-19 | 上海奥达光电子科技有限公司 | Yarn quality and component detecting method and device |
DE10342383A1 (en) * | 2003-09-13 | 2005-05-25 | Saurer Gmbh & Co. Kg | Method and device for non-contact determination of the speed of a running thread |
DE10348713A1 (en) * | 2003-10-16 | 2005-05-12 | Electrolux Home Prod Corp | Cooking oven |
DE102006015170B4 (en) * | 2006-03-30 | 2016-09-22 | Vienco Gmbh | Method and arrangement for generating an enlarged measurement volume for determining the structure and / or winding speed of textile fibers on the basis of laser Doppler anemometry |
-
2006
- 2006-07-26 DE DE102006035251A patent/DE102006035251A1/en not_active Withdrawn
-
2007
- 2007-07-26 CN CN2007800285038A patent/CN101501490B/en not_active Expired - Fee Related
- 2007-07-26 WO PCT/EP2007/006643 patent/WO2008012093A2/en active Application Filing
- 2007-07-26 EP EP07786359A patent/EP2044430A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2008012093A2 * |
Also Published As
Publication number | Publication date |
---|---|
CN101501490A (en) | 2009-08-05 |
DE102006035251A1 (en) | 2008-01-31 |
WO2008012093A3 (en) | 2008-03-27 |
CN101501490B (en) | 2013-12-04 |
WO2008012093A2 (en) | 2008-01-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2044430A2 (en) | Method and arrangement for determining the yarn quality and/or spool quality of a running thread based on laser-doppler anemometry | |
EP0650915B1 (en) | Device for testing the quality of the winding of yarn bobbins and use of the device in a winding and spinning machine | |
DE102006015170B4 (en) | Method and arrangement for generating an enlarged measurement volume for determining the structure and / or winding speed of textile fibers on the basis of laser Doppler anemometry | |
DE19882374B4 (en) | Method for determining the quality of the formation of a reel or roll of a paper or board web and for controlling reel forming or rewinding and winding | |
EP0924324B1 (en) | Apparatus for the supervision of yarns on ring spinning machines | |
EP3208370A1 (en) | Device and method for determining the diameter of a thread balloon, formed by a running thread at the workstation of a textile machine | |
EP1143236A2 (en) | Process and device for optical detection of impurities, especially fibres, in advancing yarn | |
EP3947793B1 (en) | Method of contactless optical detection of yarn at a workstation of a yarn manufacturing textile machine, an optical sensor of yarn and a textile machine | |
DE102007062631B4 (en) | Device for monitoring unwanted filament winding in a textile machine | |
DE3713783C2 (en) | Device for determining thread defects in a running thread | |
DE19510808C1 (en) | SIgnalling reel reserve in double lock stitch sewing machine reel | |
EP0740639B1 (en) | Process and device for detecting the winding of thread on a rotating roller | |
EP3088577A1 (en) | Device and method for determining the diameter of a thread balloon, formed by a running thread at the workstation of a textile machine | |
DE10342383A1 (en) | Method and device for non-contact determination of the speed of a running thread | |
EP1249422A2 (en) | Yarn clearing device in the winding station of a textile machine | |
EP3202964A1 (en) | Method and device for operating a workstation of a textile machine forming yarn balloons | |
DE10161502A1 (en) | Method and device for the continuous determination and localization of thread defects of a thread sheet running in one plane | |
DE102007011499B3 (en) | Running thread parameter determining method for use in textile machine, involves transforming thread signals by fast Fourier-transformation into complex signal spectrums, and determining speed of thread from shift and distance of sensors | |
EP2042877B1 (en) | Method and device for measuring the velocity of a thread | |
DE19808879A1 (en) | Method and device for detecting the tension of a yarn and method for winding yarn | |
DE10003861A1 (en) | Sliver monitor at a drawing unit has a passage through the sliver guide with an integrated transmitter and receiver system to register the presence and/or movement of the sliver | |
EP0892925A1 (en) | Method and device for detection of untextured yarn sections in textured filament yarns | |
EP2205981B1 (en) | Method and arrangement for determining the speed and/or length of a running thread | |
DE102008019012A1 (en) | Method and arrangement for the highly accurate determination of the instantaneous winding speed of a running thread | |
DE19960285A1 (en) | Monitor to register the increasing bobbin diameter during winding at a bobbin winder has a light transmitter and detector to register the gaps between the sensor and the bobbin and spindle surfaces |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20090213 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: LINDEN, MARTIN Inventor name: KOHNS, PETER Inventor name: HERMANNS, FERDINAND, JOSEF |
|
17Q | First examination report despatched |
Effective date: 20090617 |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VIENCO GMBH |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Effective date: 20130424 |