EP0097386A1 - Safety device for a knitting machine - Google Patents

Safety device for a knitting machine Download PDF

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Publication number
EP0097386A1
EP0097386A1 EP83200777A EP83200777A EP0097386A1 EP 0097386 A1 EP0097386 A1 EP 0097386A1 EP 83200777 A EP83200777 A EP 83200777A EP 83200777 A EP83200777 A EP 83200777A EP 0097386 A1 EP0097386 A1 EP 0097386A1
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EP
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Prior art keywords
carriage
length
pulses
perforated blade
speed
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Granted
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EP83200777A
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German (de)
French (fr)
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EP0097386B1 (en
Inventor
Louis Frund
Pierre-Lorrain Christinat
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Atelier de Construction Steiger SA
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Atelier de Construction Steiger SA
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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

Definitions

  • the subject of the present invention is a safety device for a straight knitting machine intended to ensure that the carriage stops in the event of an abrupt change in its speed following an impact or other incident such as jamming of the yarn.
  • Another solution used consists in measuring the torque necessary for driving the carriage, by means of a spring.
  • the torque increases suddenly and the detection of this increase makes it possible to stop the carriage.
  • Such detection is however coarse and does not make it possible to avoid damage for sure.
  • the object of the present invention is to provide simple, rapid and reliable detection, insensitive to disturbances other than disturbances of the movement of the carriage.
  • the device comprises means for generating pulses of length inversely proportional to the speed of the carriage, means for continuously measuring the variation in length of these pulses and means for stopping the carriage when this variation exceeds a certain reference rate.
  • a metal blade 1 Parallel to one of the needlework of the knitting machine is mounted a metal blade 1 provided with equidistant perforations 2.
  • This blade 1 is advantageously constituted by the blade already present on certain machines for counting needles, the spacing of the perforations 2 corresponding to the gauge of the needle beds.
  • a stirrup 3 integral with the carriage and carrying on one side an emitter, for example a light-emitting diode, and on the other side a sensor, for example a photodiode or a phototransistor.
  • This phototransistor can advantageously be mounted on a printed circuit comprising a first amplifier stage.
  • pulses are amplified and formed in such a way that the sequence of rectangular pulses shown in FIG. 2 is obtained approximately.
  • the signal obtained is processed by a processing unit CPU which delivers a "stop" signal when the analysis of this signal indicates a sudden disturbance in the movement of the carriage.
  • FIG. 2 schematically represents the train of pulses generated by the detector 3.
  • Each perforation 2 generates a positive pulse a followed by an interval b which can also be considered as a negative pulse.
  • the rate of change in the length of the positive pulses a is measured, on the one hand, and the rate of change in the length of the negative pulses b, on the other hand.
  • the first quotient is measured at time t ', immediately after the end of a positive pulse or upon the appearance of a negative pulse, while the second quotient is measured after each negative pulse, i.e. say as soon as a positive impulse appears.
  • the length of the pulses is advantageously measured by sampling and digital processing.
  • the rate of change is calculated and compares to the reference rate using a microprocessor.
  • the factor k is controlled by the knitting program.
  • This program can be contained in the CPU processing unit.

Abstract

Le dispositif est destiné à assurer l'arrêt du chariot en cas de variation brusque de la vitesse à la suite d'un choc ou autre incident tel que bourrage du fil. Une lame métallique 1 munie de perforations équidistantes 2 est montée parallèlement à l'une des fontures de la machine à tricoter. Un étrier (3) solidaire du chariot se déplace le long de cette lame 1. L'étrier (3) porte d'un côté un émetteur et de l'autre un capteur. Lors du déplacement du chariot la succession de perforations 2 provoque des impulsions dont la longueur est inversement proportionnelle à la vitesse de translation du chariot. Une unité de traitement CPU traite le signal obtenu après amplification et mise en forme des impulsions et délivre un signal STOP lorsqu'une brusque perturbation est détectée dans le mouvement du chariot.The device is intended to stop the carriage in the event of an abrupt change in speed following an impact or other incident such as wire jam. A metal blade 1 provided with equidistant perforations 2 is mounted parallel to one of the needle beds of the knitting machine. A stirrup (3) integral with the carriage moves along this blade 1. The stirrup (3) carries on one side a transmitter and on the other a sensor. When the carriage moves, the succession of perforations 2 causes pulses whose length is inversely proportional to the speed of translation of the carriage. A CPU processing unit processes the signal obtained after amplification and shaping of the pulses and delivers a STOP signal when an abrupt disturbance is detected in the movement of the carriage.

Description

La présente invention a pour objet un dispositif de sécurité pour machine à tricoter rectiligne destiné à assurer' l'arrêt du chariot en cas de variation brusque de sa vitesse à la suite d'un choc ou autre incident tel que bourrage du fil.The subject of the present invention is a safety device for a straight knitting machine intended to ensure that the carriage stops in the event of an abrupt change in its speed following an impact or other incident such as jamming of the yarn.

Lorsqu'une perturbation se produit pendant le tricotage, notamment lorsqu'il se produit un bourrage du fil, il est nécessaire de pouvoir arrêter rapidement le chariot car la poursuite du déplacement de celui-ci peut occasionner des dégats considérables à la fonture et aux aiguilles. On a dès lors cherché à stopper automatiquement le chariot en cas de choc. On a notamment songé à monter un microphone piézoélectrique sur les fontures pour détecter les vibrations engendrées dans les fontures par un choc sur le chariot. Il s'est avéré toutefois difficile de régler un tel détecteur pour qu'il réagisse exclusivement à des vibrations consécutives à une perturbation dangereuse du mouvement de translation du chariot.When a disturbance occurs during knitting, especially when there is a jamming of the thread, it is necessary to be able to quickly stop the carriage because the continued movement of the latter can cause considerable damage to the needle bed and the needles . We therefore sought to automatically stop the truck in the event of an impact. In particular, consideration has been given to mounting a piezoelectric microphone on the needle beds to detect the vibrations generated in the needle beds by an impact on the carriage. However, it proved difficult to resolve such a detector so that it reacts exclusively to vibrations consecutive to a dangerous disturbance of the translational movement of the carriage.

Une autre solution utilisée consiste à mesurer le couple nécessaire pour l'entrainement du chariot, au moyen d'un ressort. Lorsque le chariot rencontre une résistance anormale, le couple augmente brusquement et la détection de cette augmentation permet de stopper le chariot. Une telle détection est toutefois grossière et ne permet pas d'éviter à coup sûr des dégats.Another solution used consists in measuring the torque necessary for driving the carriage, by means of a spring. When the carriage encounters an abnormal resistance, the torque increases suddenly and the detection of this increase makes it possible to stop the carriage. Such detection is however coarse and does not make it possible to avoid damage for sure.

Dans le but de détecter des défectuosités des aiguilles, des fontures ou des clavettes, il a été proposé de monter des jauges de contrainte sur les cames du chariot et d'afficher le signal mesuré sur l'écran d'un oscilloscope (US-A-3.955.407).In order to detect defects in needles, needle beds or keys, it has been proposed to mount strain gauges on the cams of the carriage and to display the measured signal on the screen of an oscilloscope (US-A -3.955.407).

On a également proposé de surveiller les aiguilles d'une machine à tricoter, afin de détecter les aiguilles endommagées ou manquantes, au moyen d'un dispositif de palpage photoélectrique captant la lumière réfléchie par les aiguilles, dans lequel un circuit d'interprétation du signal répond à l'intervalle de temps observé entre les impulsions successives délivrées par le dispositif de palpage et correspondant à des aiguilles présentes et intactes (FR-A-2.005.725). Ce dispositif ne détecte pas un freinage du chariot. Il dépend en outre de la qualité de surface de la tête des aiguilles.It has also been proposed to monitor the needles of a knitting machine, in order to detect damaged or missing needles, by means of a photoelectric feeler device capturing the light reflected by the needles, in which a signal interpretation circuit responds to the time interval observed between the successive pulses delivered by the feeler device and corresponding to needles present and intact (FR-A-2.005.725). This device does not detect braking of the truck. It also depends on the surface quality of the head of the needles.

La présente invention a pour but d'assurer une détection simple, rapide et sûre, insensible aux perturbations autres que les perturbations du mouvement du chariot.The object of the present invention is to provide simple, rapid and reliable detection, insensitive to disturbances other than disturbances of the movement of the carriage.

A cet effet le dispositif selon l'invention comprend des moyens pour engendrer des impulsions de longueur inversement proportionnelle à la vitesse du chariot, des moyens pour mesurer de façon continue la variation de longueur de ces impulsions et des moyens pour stopper le chariot lorsque cette variation dépasse un certain taux de référence.To this end, the device according to the invention comprises means for generating pulses of length inversely proportional to the speed of the carriage, means for continuously measuring the variation in length of these pulses and means for stopping the carriage when this variation exceeds a certain reference rate.

De manière à réduire au minimum le temps de réaction du dispositif, on mesure non seulement la variation entre deux impulsions successives, mais également la variation entre les intervalles successifs entre les impulsions qui se suivent.In order to minimize the reaction time of the device, not only the variation between two successive pulses is measured, but also the variation between the successive intervals between the pulses which follow one another.

Une forme d'exécution de l'invention sera décrite, à titre d'exemple, au moyen du dessin annexé.

  • La figure 1 représente schématiquement le dispositif de formation des impulsions.
  • La figure 2 représente un train d'impulsions perturbé par un brusque freinage du chariot consécutif à un choc.
An embodiment of the invention will be described, by way of example, by means of the appended drawing.
  • FIG. 1 schematically represents the device for forming the pulses.
  • FIG. 2 represents a train of pulses disturbed by an abrupt braking of the carriage following an impact.

Parallèlement à l'une des fontures de la machine à tricoter est montée une lame métallique 1 munie de perforations équidistantes 2. Cette lame 1 est avantageusement constituée par la lame déjà présente sur certaines machines pour le comptage des aiguilles, l'écartement des perforations 2 correspondant à la jauge des fontures. Le long de cette lame se déplace un étrier 3, solidaire du chariot et portant d'un côté un émetteur, par exemple une diode électroluminescente, et de l'autre côté un capteur, par exemple une photodiode ou un phototransistor. Ce phototransistor peut être avantageusement monté sur un circuit imprimé comportant un premier étage amplificateur. Lors du déplacement du chariot la succession des fentes 2 provoque l'apparition d'impulsions dont la longueur est inversement proportionnelle à la vitesse de translation du chariot. Ces impulsions sont amplifiées et formées de telle sorte que l'on obtient approximativement la suite d'impulsions rectangulaires représentées à la figure 2. Le signal obtenu est traité par une unité de traitement CPU qui délivre un signal "stop" lorsque l'analyse de ce signal fait reconnaître une brusque perturbation dans le mouvement du chariot.Parallel to one of the needlework of the knitting machine is mounted a metal blade 1 provided with equidistant perforations 2. This blade 1 is advantageously constituted by the blade already present on certain machines for counting needles, the spacing of the perforations 2 corresponding to the gauge of the needle beds. Along this blade moves a stirrup 3, integral with the carriage and carrying on one side an emitter, for example a light-emitting diode, and on the other side a sensor, for example a photodiode or a phototransistor. This phototransistor can advantageously be mounted on a printed circuit comprising a first amplifier stage. When the carriage moves, the succession of slots 2 causes the appearance of pulses whose length is inversely proportional to the speed of translation of the carriage. These pulses are amplified and formed in such a way that the sequence of rectangular pulses shown in FIG. 2 is obtained approximately. The signal obtained is processed by a processing unit CPU which delivers a "stop" signal when the analysis of this signal indicates a sudden disturbance in the movement of the carriage.

La figure 2 représente schématiquement le train d'impulsions engendrées par le détecteur 3. Chaque perforation 2 engendre une impulsion positive a suivie d'un intervalle b que l'on peut considérer également comme une impulsion négative. Au moyen d'un circuit adéquat on mesure, d'une part, le taux de variation de la longueur des impulsions positives a et, d'autre part, le taux de variation de la longueur des impulsions négatives b. On mesure plus précisément les quotients

Figure imgb0001
FIG. 2 schematically represents the train of pulses generated by the detector 3. Each perforation 2 generates a positive pulse a followed by an interval b which can also be considered as a negative pulse. By means of a suitable circuit, the rate of change in the length of the positive pulses a is measured, on the one hand, and the rate of change in the length of the negative pulses b, on the other hand. We measure the probabilities more precisely
Figure imgb0001

Le premier quotient est mesuré à l'instant t', immédiatement après la fin d'une impulsion positive ou dès l'apparition d'une impulsion négative, tandis que le second quotient est mesuré après chaque impulsion négative, c'est-à-dire dès l'apparition d'une impulsion positive. La longueur des impulsions est avantageusement mesurée par échantillonnage et traitement numérique. Le taux de variation est calculé et compare au taux de référence au moyen d'un microprocesseur.The first quotient is measured at time t ', immediately after the end of a positive pulse or upon the appearance of a negative pulse, while the second quotient is measured after each negative pulse, i.e. say as soon as a positive impulse appears. The length of the pulses is advantageously measured by sampling and digital processing. The rate of change is calculated and compares to the reference rate using a microprocessor.

Si le chariot est brusquement freiné à la suite d'un choc, il apparaît tout à coup une impulsion a d'une durée a' plus longue que la durée a' de l'impulsion précédente. De même, en général, l'intervalle b" sera plus long que l'intervalle b'. Il est possible par contre que l'impulsion positive suivante soit plus courte qu'une impulsion normale. C'est pourquoi l'on mesure la valeur absolue de la différence. Le chariot est stoppé si le quotient

Figure imgb0002
est supérieur à une a' valeur k limite déterminée expérimentalement. De même pour le second quotient mesuré.If the carriage is suddenly braked following an impact, there suddenly appears a pulse a of duration a 'longer than the duration a' of the previous pulse. Likewise, in general, the interval b "will be longer than the interval b '. It is however possible that the next positive pulse is shorter than a normal pulse. This is why the absolute value of the difference. The carriage is stopped if the quotient
Figure imgb0002
 is greater than a limit value k 'determined experimentally. Likewise for the second quotient measured.

On pourrait se contenter de comparer les impulsions positives, mais en comparant également les impulsions négatives, c'est-à-dire les intervalles, on augmente la sensibilité du dispositif de sécurité en réduisant dans certains cas le temps de réaction, étant donné que selon l'instant où se produit le choc, il peut très bien arriver qu'on ait tout d'abord une variation de la longueur des intervalles, c'est-à-dire des impulsions négatives, précédant une variation de longueur des impulsions positives, contrairement à ce qui a été représenté à la figure 2.We could be content to compare the positive pulses, but also comparing the negative pulses, i.e. the intervals, we increase the sensitivity of the safety device by reducing in some cases the reaction time, since according to the instant when the shock occurs, it may very well happen that there is first of all a variation in the length of the intervals, that is to say negative pulses, preceding a variation in length of the positive pulses, contrary to what has been represented in FIG. 2.

Etant donné que le chariot ne travaille pas toujours à la même vitesse, il peut être judicieux d'asservir le facteur k à la vitesse du chariot.Since the carriage does not always work at the same speed, it may be advisable to control the factor k at the speed of the carriage.

D'autre part, il convient de tenir compte de certains impératifs tels que la marche manuelle et la phase de renversement de sens du chariot en fin de course. On peut tenir compte de ce renversement en rendant le dispositif de sécurité opérant seulement sur une certaine longueur de la fonture.On the other hand, certain imperatives should be taken into account such as manual operation and the phase of direction reversal of the carriage at the end of the stroke. We can take this reversal into account by making the safety device operating only over a certain length of the needle bed.

Dans certaines conditions, en particulier lors du tricotage de côtes, il peut être judicieux de réduire la sensibilité du dispositif pour certaines rangées de tricotage, afin d'éviter un arrêt non désiré. A cet effet le facteur k est asservi au programme de tricotage. Ce programme peut être contenu dans l'unité de traitememt CPU.Under certain conditions, in particular when knitting ribs, it may be advisable to reduce the sensitivity of the device for certain rows of knitting, in order to avoid an unwanted stopping. For this purpose the factor k is controlled by the knitting program. This program can be contained in the CPU processing unit.

Claims (7)

1. Dispositif de sécurité pour machine à tricoter rectiligne assurant l'arrêt du chariot en cas de variation brusque de sa vitesse à la suite d'un choc ou autre incident, caractérisé par le fait qu'il comprend des moyens pour engendrer des impulsions de longueur inversement proportionnelle à la vitesse du chariot, des moyens pour mesurer de façon continue la variation de longueur des impulsions et des moyens pour stopper le chariot lorsque cette variation dépasse un certain taux de référence.1. Safety device for a straight knitting machine ensuring the carriage stops in the event of an abrupt change in its speed following an impact or other incident, characterized in that it comprises means for generating pulses of length inversely proportional to the speed of the carriage, means for continuously measuring the variation in pulse length and means for stopping the carriage when this variation exceeds a certain reference rate. 2. Dispositif selon la revendication 1, caractérisé par le fait que les moyens pour mesurer la variation de la longueur des impulsions comprennent des moyens électronique pour mesure en continu le rapport entre la différence de longueur de deux impulsions successives et la longueur de la première de ces impulsions.2. Device according to claim 1, characterized in that the means for measuring the variation in the length of the pulses comprise electronic means for continuous measurement of the ratio between the difference in length of two successive pulses and the length of the first of these impulses. 3. Dispositif selon la revendication 2, caractérisé par le fait que ledits moyens de mesure sont agencés de manière à mesurer également le rapport entre la différence de longueur de deux intervalles successifs séparant les impulsions et la longueur du premier de ces intervalles.3. Device according to claim 2, characterized in that said measuring means are arranged so as to also measure the ratio between the difference in length of two successive intervals separating the pulses and the length of the first of these intervals. 4. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que les moyens pour engendrer lesdites impulsions comprennent une lame perforée fixée parallèlement à la fonture, un émetteur de lumière solidaire du chariot et se déplaçant d'un côté de la lame perforée et un récepteur optoélectronique solidaire du chariot et monté en face dudit émetteur de l'autre côté de la lame perforée.4. Device according to one of claims 1 to 3, characterized in that the means for generating said pulses comprise a perforated blade fixed parallel to the needle bed, a light emitter secured to the carriage and moving on one side of the perforated blade and an optoelectronic receiver secured to the carriage and mounted opposite said transmitter on the other side of the perforated blade. 5. Dispositif selon la revendication 4 destiné à équiper une machine à tricoter équipé d'une lame perforée à la jauge de la fonture pour le comptage des aiguilles, caractérisé par le fait que la lame perforée du dispositif de sécurité est constituée par la lame perforée utilisée pour le comptage des aiguilles.5. Device according to claim 4 intended to equip a knitting machine equipped with a perforated blade at the gauge of the needle bed for counting needles, characterized in that the perforated blade of the safety device is constituted by the perforated blade used for counting needles. 6. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que ledit taux de référence est asservi à la vitesse de translation du chariot.6. Device according to one of claims 1 to 3, characterized in that said reference rate is controlled by the speed of translation of the carriage. 7. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que ledit taux de référence est asservi au programme de tricotage.7. Device according to one of claims 1 to 3, characterized in that said reference rate is subject to the knitting program.
EP83200777A 1982-06-11 1983-06-02 Safety device for a knitting machine Expired EP0097386B1 (en)

Applications Claiming Priority (2)

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CH363482 1982-06-11
CH3634/82 1982-06-11

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EP0097386A1 true EP0097386A1 (en) 1984-01-04
EP0097386B1 EP0097386B1 (en) 1985-08-14

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US (1) US4505135A (en)
EP (1) EP0097386B1 (en)
JP (1) JPS599249A (en)
DD (1) DD209862A5 (en)
DE (1) DE3360569D1 (en)
ES (1) ES8405093A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607156A1 (en) * 1986-11-13 1988-05-27 Stoll H Gmbh & Co SAFETY DEVICE FOR A STRETCH KNITTING MACHINE
CN109505053A (en) * 2018-12-12 2019-03-22 福建睿能科技股份有限公司 Flat-knitting machine head component and head motion control method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62169714U (en) * 1986-04-14 1987-10-28
JP5362584B2 (en) * 2007-12-21 2013-12-11 株式会社島精機製作所 Detection method of abnormal vibration in flat knitting machine and flat knitting machine
CN114672923A (en) 2017-03-31 2022-06-28 耐克创新有限合伙公司 Knitting machine with electronic auxiliary components

Citations (2)

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FR2190301A5 (en) * 1972-06-15 1974-01-25 Sick Optik Elektronik Erwin
GB2051141A (en) * 1979-05-14 1981-01-14 Schieber Universal Maschf Flatbed knitting machine with pulse generator for electronic control

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Publication number Priority date Publication date Assignee Title
AT303949B (en) * 1968-04-08 1972-12-11 Sick Erwin Device for monitoring circular knitting machines
CH525317A (en) * 1970-11-17 1972-07-15 Stoll & Co H Safety device for flat knitting machines
US3780297A (en) * 1971-10-04 1973-12-18 Us Industries Inc Conveyor speed monitor
US4027982A (en) * 1975-04-23 1977-06-07 Kyodo Denshi Kogyo Co., Ltd. Needle detector for circular knitting machines
US3955407A (en) * 1975-04-29 1976-05-11 The Singer Company Method and apparatus for testing knitting machines
US4037157A (en) * 1976-04-05 1977-07-19 The United States Of America As Represented By The Secretary Of The Interior Electro-optical speed transducer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2190301A5 (en) * 1972-06-15 1974-01-25 Sick Optik Elektronik Erwin
GB2051141A (en) * 1979-05-14 1981-01-14 Schieber Universal Maschf Flatbed knitting machine with pulse generator for electronic control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607156A1 (en) * 1986-11-13 1988-05-27 Stoll H Gmbh & Co SAFETY DEVICE FOR A STRETCH KNITTING MACHINE
CN109505053A (en) * 2018-12-12 2019-03-22 福建睿能科技股份有限公司 Flat-knitting machine head component and head motion control method
CN109505053B (en) * 2018-12-12 2020-10-16 福建睿能科技股份有限公司 Flat knitting machine head assembly and head motion control method

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US4505135A (en) 1985-03-19
JPS599249A (en) 1984-01-18
ES523171A0 (en) 1984-05-16
ES8405093A1 (en) 1984-05-16
JPS639063B2 (en) 1988-02-25
DD209862A5 (en) 1984-05-23
DE3360569D1 (en) 1985-09-19
EP0097386B1 (en) 1985-08-14

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