EP2092100B1 - Procédé et dispositif de surveillance d'aiguilles - Google Patents

Procédé et dispositif de surveillance d'aiguilles Download PDF

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Publication number
EP2092100B1
EP2092100B1 EP06829013A EP06829013A EP2092100B1 EP 2092100 B1 EP2092100 B1 EP 2092100B1 EP 06829013 A EP06829013 A EP 06829013A EP 06829013 A EP06829013 A EP 06829013A EP 2092100 B1 EP2092100 B1 EP 2092100B1
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EP
European Patent Office
Prior art keywords
signal
needles
time interval
pulses
pulse
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EP06829013A
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German (de)
English (en)
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EP2092100A1 (fr
Inventor
Andreas Lutters
Filipo Oneda
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Memminger IRO GmbH
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Memminger IRO GmbH
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/18—Indicating, warning, or safety devices, e.g. stop motions responsive to breakage, misplacement, or malfunctioning of knitting instruments

Definitions

  • the invention relates to a method for monitoring needles on knitting machines and a corresponding device.
  • Knitting machines have a large number of knitting needles, which are subject to wear and in particular can break off. Often knitting machines, in particular circular knitting machines are used for the ongoing production of large quantities of goods. If a needle breaks, the result is a defect in the goods produced. There is produced rejects. However, needle breaks can occur again and again. It is therefore important to monitor the needles of the running knitting machine. For this purpose, various efforts have already been made.
  • the U.S. Patent 3,577,750 discloses a monitoring arrangement with an optical sensor in the form of a light barrier, run through the measuring path, the needle heads.
  • the pulses generated during the passage of the needle heads through the light path of the light barrier are converted into rectangular pulses.
  • the length of such a pulse is relatively large in intact needles, while it is significantly lower in broken needles. If the pulse length is shorter than expected, an alarm signal is given.
  • This monitoring method is based on the requirement of constant engine speed. If it is to be adjusted so sensitively that even needle bends or only fractures of parts of the hooks can be recognized, there are false alarms in case of speed fluctuations of the knitting machine.
  • the hooks of the needles run through the focal point of a lens for optical needle monitoring. It is optically generated a signal containing a periodic component in which individual pulses are visible. When a needle is bent, a single pulse will appear a little earlier or a little later. As a result, the time interval to the one neighboring pulse is shortened and increased to the other neighboring pulse. If a needle is missing, the time interval between two successive pulses is doubled from the normal value. In this way, the monitoring of the needles is attributed to a time measurement. This is done, for example, by comparing the actual pulses obtained with a sequence of desired pulses, wherein an error signal is triggered when the actually obtained pulse deviates from the desired pulse.
  • the beats DD 274 455 A1 The needle monitoring ago by derived from the individual needles signal pulses and converted into digital signals. For each needle, a comparison is made between a stored and a current signal value. If the signals are outside a predetermined value range, an error signal is generated.
  • a preset counter is used, which is preset to the desired number of needles. He counts the needle pulses backwards. If the preselection counter does not reach the desired value (zero) after one or more machine revolutions, an alarm signal is generated.
  • the latter method is insensitive to variations in engine speed. Also, needle vibrations that shorten or lengthen the interval between successive needle pulses during one machine revolution can hardly result in machine shutdowns.
  • the method is only applicable if the needle number of the machine is known. Also, a missing or bent needle is detected only after a complete machine revolution. In the worst case, multiple machine revolutions are required to capture. However, the goal is to capture errors as quickly as possible.
  • the DE 19 924 924 A1 discloses a method and an apparatus according to the preamble of claims 1 and 14.
  • Bent or broken needles are thus reliably detectable regardless of the insensitivity of the method according to the invention against fluctuations in speed. Furthermore, a failed needle is immediately detectable. There is no need to wait for a machine cycle.
  • the mentioned limit factors can be determined depending on the operating state of the knitting machine. For example, they can be changed when starting the machine by increasing the upper limit factor and decreasing the lower limit factor. This increases the permissible tolerance for the time intervals. In stationary operation, the differences between the two limiting factors can be reduced, which narrows the tolerance interval. This allows bent needles to be detected at a very early stage of their deformation and wear.
  • the cutoff factors can be set symmetrically (e.g., 0.8 and 1.2, which equals ⁇ 20%) or also asymmetrically (e.g., 0.9 and 1.3, which equals -10% and + 30%, respectively).
  • the desired number is determined in a test run. It is neither necessary nor appropriate to register the signal pattern generated by the needles.
  • the signal pattern may vary from cycle to cycle as a result of needle vibrations and as a result of the thread moving from the needles. However, it may not be the number of detected needles, i. the number of detected signal pulses varies, which is reliably monitored by the present method.
  • the switching thresholds for the signal conversion from the analog signal dynamically adapt to the digital signal. For example, an optionally weighted average of the average amplitude value of one or more preceding signal pulses can be used to form an average value to be expected for the next signal pulse.
  • the lower trigger threshold for signal shaping can be determined by subtracting a fixed amount from this expected mean value.
  • the upper trigger threshold for signal shaping can be determined by adding a fixed amount to the expected average.
  • FIG. 1 is schematized to the extreme schematized a knitting machine 1 in the form of a circular knitting machine with needles 2 on a needle cylinder 3.
  • the needles 2 is associated with an optical monitoring device 4, to which an optical head 5 and an evaluation device 6 belong.
  • the head 5 is connected, for example via an optical fiber 6 to a light source 7 to send a light beam to the passing needles or their hooks or heads.
  • the light beam can be light with a particular frequency, the light receiver is then set to this frequency, to avoid stray light interference. It is also possible to use pulsed and / or modulated light to avoid external light interference. Only the received light, which corresponds to the transmitted light, is then evaluated.
  • optical fibers and a head 5 having a front outer diameter of, for example, only 1 to 2 mm it is possible to position the sensor in inaccessible places of the knitting machine.
  • a sensor head in which the two optical fibers together have a diameter of only about 0.5 mm. This makes the monitored area very small. Even with very small needles, this ensures that only a single needle head is monitored.
  • the sensor heads are brought very close to the needle heads.
  • the distance is for example only 0.2 to 0.5 mm. This gives a high received signal strength.
  • another sensor at a distance of e.g. to provide ten needles on the circumference of the knitting machine.
  • Other sensors may be provided at further intervals. Are e.g. If two sensors are provided, past which the needles pass in succession, it can be provided that the machine only stops if both sensors transmit the same error message one after the other.
  • the signal pulse S i qualifies as a valid signal pulse and no alarm signal is generated. This pulse is counted, for example.
  • corresponding error signals can be derived from a plurality of sensors which are arranged at different points of the circumference of the knitting machine, wherein a valid error signal is only generated if all sensors for the same needle position generate an error signal.
  • an alarm signal is only generated when the signal pulse that is outside the time window or repeats itself at the same position or needle position during the following machine revolution.
  • time interval T i-1 used for the comparison
  • a different reference time value which is calculated, for example, from a plurality of preceding time intervals.
  • the calculation can be carried out, for example, by calculating an arithmetic mean, a weighted mean or another comparison value.
  • the alarm signal can be displayed on the display 10 of the evaluation device 6. It is also possible to relay this alarm signal. For example, network connections can serve this purpose. It can also be passed to the knitting machine 1 to shut down this.
  • FIG. 3 This illustrates a needle sequence 2 'in which a needle 2a is partially damaged, eg broken off.
  • the corresponding analog signal AS falls below an upper threshold in this case.
  • a corresponding digital signal pulse is not generated.
  • the time interval T 5 is twice as large as the time interval T 4 . This large deviation is no longer tolerated.
  • the limit p o is exceeded and an alarm signal is generated.
  • the evaluation device 6 may have a sensor, which is not further illustrated, or may be connected to such a sensor, which in each case delivers a pulse at each rotation of the needle cylinder 3 at a defined point. This can be one pulse per revolution or even several pulses per revolution of the knitting cylinder. If the number of pulses counted per revolution deviates from a desired number Z, an alarm signal can be generated. This can in turn be displayed on a display of the evaluation device 6 or forwarded for further processing in a network wired or wireless.
  • the desired number Z can be entered by the operator, for example via the keypad 11. However, it is also possible to start a learning mode of the evaluation device 6 via the keypad 11, in which the evaluation device 6 the Number of needles automatically detected. This can happen, for example, in a test run over one or more revolutions. The number of needles detected in the test run with an intact machine is then stored as a setpoint Z.
  • the needle cylinder 3 is not completely populated with needles or there are intentionally larger gaps between individual needles.
  • the evaluation device 6 may be modified so that it interrupts the needle monitoring at the predetermined selected location.
  • FIG. 4 An illustration of the appropriate procedure is in FIG. 4 given.
  • the sequence of needles 2 has two gaps L 1 , L 2 .
  • the needles and the associated analog signals AS, as well as the signal pulses S are designated merely by their index positions 1, 2, 3, etc.
  • the needles are missing at the index positions 3 and 6. Accordingly, no signal pulses S are present at the index positions 3 and 6.
  • the failure of these pulses would be in accordance with the FIG. 2 given description for the generation of alarm signals. However, this is avoided in an extended embodiment.
  • the index positions at which no needles 2 are present, in the present embodiment, the index positions 3 and 6, are either entered via the keypad 11 in the evaluation device 6 or registered in the test run.
  • the corresponding time interval extending from the signal pulse S 2 to the signal pulse S 4 is thus excluded from the test described above. The same applies to the time interval preceding the signal pulse S 7 .
  • the evaluator described so far has several advantages. For one, it is insensitive to speed fluctuations of the knitting machine. On the other hand, it is largely insensitive to influences of the thread and needle vibrations. Furthermore, bent or broken needles can be reliably detected. It is not necessary to store an entire needle pattern. Irregular needle sequences can be monitored by pre-storing the positions of missing needles. This comes with very little storage space. Here, the fact is exploited that needles can be present on the knitting cylinder only according to the predetermined pitch. It is therefore sufficient to store the index position of non-existent needles in order to suppress generation of the alarm signal at this point.
  • the amplitude of the signals generated by the sensor is monitored. This is based on FIG. 5 illustrated.
  • the signal thresholds T1, Tb used for triggering these analog signals are calculated from the signal thresholds and signal average values Tm of preceding pulses. In this way, trends in long-wave signal amplitude fluctuations can be detected and rendered harmless.
  • the lower trigger limits Tl can be approximated by the two mean signal values Tm of the preceding pulses. This can be done by averaging, for example. For example, the averages of several previous pulses can be added by weight and divided by a factor.
  • the lower trigger threshold for shaping the next pulse can be determined by subtracting a fixed amount from this expected average.
  • the upper trigger threshold for signal shaping This next pulse can be determined by adding a fixed amount to the expected average. This results in a hysteresis method.
  • the switching thresholds T1 and Th are thus set dynamically as a function of the signal amplitude of the preceding pulses. In a circulation of the knitting cylinder regularly occurring fluctuations of the signal amplitudes are thus made ineffective as a disturbance factor.
  • the inventive method for monitoring needles of a knitting machine is based on a dynamic definition of the monitored time intervals between individual needle pulses.
  • the duration of at least one or more preceding periods between individual signal pulses is taken as a measure of the time interval currently to be evaluated.
  • a dynamic determination of the switching thresholds for generating the signal pulses can be made. Again, the amplitude of preceding pulses is analyzed, a trend is determined, and the switching thresholds for generating the current signal pulse are determined from this trend.
  • This method can be used to evaluate the pulses generated at all needle positions. If the needle cylinder is intentionally only partially loaded, individual needle positions can be indexed accordingly and excluded from the evaluation. This provides a reliable robust and reliable monitoring method.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (14)

  1. Procédé de surveillance d'aiguilles dans des machines à tricoter, dont les aiguilles présentent une vitesse relative par rapport à un capteur optique en se déplaçant dans le champ visuel de celui-ci, ce procédé étant caractérisé en ce qu'au moins pour quelques aiguilles, chaque fois qu'une d'elles se déplace dans le champ visuel du capteur, celui-ci émet une impulsion de signal (S1, S2, S3,... Sn), l'intervalle de temps (T1, T2, T3,... Tn) séparant des impulsions de signal (S1, S2, S3,... Sn) qui se suivent étant déterminé et une impulsion de signal (Si) étant enregistrée comme étant une impulsion séquentielle valable (Si) de l'impulsion de signal précédente (Si-1) seulement si l'intervalle de temps (Ti) est inférieur au produit (po·Ti-1) d'un facteur limité (po) supérieur et d'un intervalle de temps de référence (Ti-1) et s'il est également supérieur au produit (pu·Ti-1) d'un facteur limité (pu) inférieur et de l'intervalle de temps de référence (Ti-1).
  2. Procédé selon la revendication 1, caractérisé en ce que l'intervalle de temps de référence est un intervalle de temps directement précédent (Ti-1).
  3. Procédé selon la revendication 1, caractérisé en ce que l'intervalle de temps de référence est une valeur de référence calculée à partir d'un ou plusieurs intervalles de temps précédents (Ti-1,... Ti-n).
  4. Procédé selon la revendication 1, caractérisé en ce que l'amplitude (A1, A2, A3,... An) des impulsions individuelles de signal (S1, S2, S3,... Sn) est enregistrée.
  5. Procédé selon la revendication 1, caractérisé en ce que pour obtenir les impulsions de signal, sont utilisés des seuils de déclenchement établis à partir des amplitudes (A1, A2, A3,... An).
  6. Procédé selon la revendication 1, caractérisé en ce qu'un signal d'alarme est produit quand une impulsion de signal (Si) se trouve en dehors d'une fenêtre de temps (ΔTi = pu·Ti-1 - po·Ti-1).
  7. Procédé selon la revendication 1, caractérisé en ce que le nombre des impulsions de signal (S1, S2, S3,..., Sn) enregistrées par course ou tour de la machine à tricoter est comparé à un nombre de consigne (Z) et un signal d'alarme est produit en cas d'écart.
  8. Procédé selon la revendication7, caractérisé en ce que le nombre de consigne (Z) est déterminé au cours d'un passage d'essai.
  9. Procédé selon la revendication 1, caractérisé en ce qu'au cours d'un passage d'essai sont déterminées des positions de vide pour lesquelles aucune aiguille n'est prévue.
  10. Procédé selon les revendications 9 et 6, caractérisé en ce que la génération d'un signal d'alarme est interrompue si l'impulsion de signal manque à une position de vide et ne se trouve donc pas dans la fenêtre de temps (ΔTi = pu·Ti-1 - po·Ti-1).
  11. Procédé selon la revendication 1, caractérisé en ce que l'exécution du procédé est interrompue quand démarre le métier à tricoter.
  12. Procédé selon la revendication 1, caractérisé en ce que sur un écran est affiché le nombre des impulsions de signal (S1, S2, S3,... Sn) saisies par course ou tour de la machine.
  13. Procédé selon la revendication 1, caractérisé en ce que sur un écran est affichée l'amplitude (A1, A2, A3,... An) de chaque impulsion de signal (S1, S2, S3,... Sn) saisie.
  14. Dispositif de surveillance d'aiguilles dans des machines à tricoter, dont les aiguilles présentent une vitesse relative par rapport à un capteur optique en se déplaçant dans le champ visuel de celui-ci, ce dispositif étant caractérisé en ce qu'il présente un dispositif de commande qui, chaque fois qu'une aiguille se déplace dans son champ visuel, saisit une impulsion de signal (S1, S2, S3,... Sn) produite par le capteur, détermine l'intervalle de temps (T1, T2, T3,... Tn) séparant des impulsions de signal (S1, S2, S3,... Sn) qui se suivent et enregistre une impulsion de signal (Si) comme étant une impulsion séquentielle valable (Si) de l'impulsion de signal précédente (Si-1) seulement si l'intervalle de temps (Ti) est inférieur au produit (po·Ti-1) d'un facteur limité (po) supérieur et d'un intervalle de temps de référence (Ti-1) et s'il est également supérieur au produit (pu·Ti-1) d'un facteur limité (pu) inférieur et de l'intervalle de temps de référence (Ti-1).
EP06829013A 2006-11-13 2006-11-13 Procédé et dispositif de surveillance d'aiguilles Active EP2092100B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/010844 WO2008058550A1 (fr) 2006-11-13 2006-11-13 Procédé et dispositif de surveillance d'aiguilles

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EP2092100A1 EP2092100A1 (fr) 2009-08-26
EP2092100B1 true EP2092100B1 (fr) 2010-05-26

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EP (1) EP2092100B1 (fr)
CN (1) CN101535545B (fr)
AT (1) ATE469256T1 (fr)
BR (1) BRPI0622121B1 (fr)
DE (1) DE502006007062D1 (fr)
TW (1) TWI335362B (fr)
WO (1) WO2008058550A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2024235561A1 (fr) * 2023-05-12 2024-11-21 Protechna Herbst Gmbh & Co. Kg Machine à tricoter dotée d'un dispositif de surveillance, et procédé de surveillance d'aiguilles pendant le fonctionnement de la machine à tricoter

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DE102010048173B3 (de) * 2010-10-13 2012-01-05 Memminger-Iro Gmbh Verfahren zur Justierung eines Sensorkopfes einer Nadelüberwachungseinrichtung und Nadelüberwachungseinrichtung
CN102199843B (zh) * 2011-05-26 2013-08-07 浙江恒强科技股份有限公司 横机撞针检测方法
CN102330275A (zh) * 2011-08-01 2012-01-25 鲁文杰 一种电脑横机故障检测系统
CN103225166A (zh) * 2013-04-23 2013-07-31 慈溪太阳洲纺织科技有限公司 圆桶形针织机和圆桶形针织机上的织针损坏监测方法
CN103469472B (zh) * 2013-09-13 2016-03-09 中国科学院上海光学精密机械研究所 针织机织针在线检测装置及检测方法
CN104480627A (zh) * 2014-10-22 2015-04-01 常州市第八纺织机械有限公司 铺纬针断针检测系统
CN108060507A (zh) * 2018-01-25 2018-05-22 常州市新创智能科技有限公司 纬纱针断针检测装置及其使用方法
CN113818141B (zh) * 2021-10-13 2022-11-18 诸暨市斌果科技有限公司 一种基于机器视觉的袜机编织检测系统
CN119145118A (zh) * 2024-11-14 2024-12-17 天津禾田电器有限公司 一种针织机用断针定位方法系统

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Publication number Priority date Publication date Assignee Title
WO2024235561A1 (fr) * 2023-05-12 2024-11-21 Protechna Herbst Gmbh & Co. Kg Machine à tricoter dotée d'un dispositif de surveillance, et procédé de surveillance d'aiguilles pendant le fonctionnement de la machine à tricoter

Also Published As

Publication number Publication date
EP2092100A1 (fr) 2009-08-26
ATE469256T1 (de) 2010-06-15
CN101535545B (zh) 2011-06-29
BRPI0622121A2 (pt) 2011-12-27
TWI335362B (en) 2011-01-01
CN101535545A (zh) 2009-09-16
TW200839049A (en) 2008-10-01
WO2008058550A1 (fr) 2008-05-22
BRPI0622121B1 (pt) 2016-12-27
DE502006007062D1 (de) 2010-07-08

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