WO1985002633A1 - Fabric rolling mechanism for circular knitting machine - Google Patents

Fabric rolling mechanism for circular knitting machine Download PDF

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Publication number
WO1985002633A1
WO1985002633A1 PCT/CH1984/000190 CH8400190W WO8502633A1 WO 1985002633 A1 WO1985002633 A1 WO 1985002633A1 CH 8400190 W CH8400190 W CH 8400190W WO 8502633 A1 WO8502633 A1 WO 8502633A1
Authority
WO
WIPO (PCT)
Prior art keywords
fabric
axis
roller
stirrup
pair
Prior art date
Application number
PCT/CH1984/000190
Other languages
French (fr)
Inventor
Erwin Zurcher
Rémy Cottenceau
Rudolf Farkas
Original Assignee
Battelle Memorial Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Battelle Memorial Institute filed Critical Battelle Memorial Institute
Publication of WO1985002633A1 publication Critical patent/WO1985002633A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/88—Take-up or draw-off devices for knitting products

Definitions

  • the subject of the present invention is a mechanism for winding a fabric for a circular knitting machine comprising at least two rolls for pinching the fabric arranged in a horizontal plane and between which the fabric passes after having surrounded a portion of the first roller and leaves them after having surrounded a portion of the second roller, a winding bar and means for driving these rollers and this bar.
  • the role of the fabric pinch rollers is to exert a determined pull on the knitted fabric and thus to ensure the regularity of the stitches.
  • the winding roller is used to collect the knitted fabric with a certain tension which ensures a regular width of the wound product. It has already been proposed to pass the knitted fabric alternately below and above two or even three pinch rollers so that the friction generated between the rollers and the fabric reduces the passage of tension between the strands situated above and below. below these rollers.
  • any slippage of the knitted fabric is not excluded through the pinch rollers, on the other hand, the diameter of the winding coil varies constantly, which implies a variable ent speed. of the winding roller so that the winding tension is constant.
  • patent CH-A-501 084 relates to a magnetic braking device including a magnet, a lever actuating this magnet and the position of which depends on the diameter of the roll of fabric. As this diameter increases, the lever approaches the magnet of a valve integral with the axis of the fabric roll and brakes it.
  • Patent CH-A-539,156 relates to a device in which
  • the fabric extraction roller is kinematically integral with the needle bed and is therefore driven positively at a speed proportional to that of the needle bed.
  • Fig. 1 is a perspective view of this mechanism.
  • Fig. 2 is a sectional view along line II-II of FIG. 1.
  • Fig. 3 is a sectional view along line III-III of FIG. 1
  • Fig. 4 is a sectional view along line IV-IV of FIG. 1.
  • Fig. 5 is a block diagram of the electric motor control circuit.
  • Fig. 1 only illustrates the knitting winding mechanism produced by the circular knitting loom which has not been shown.
  • This knitting is in the form of a tube 1 which is flattened between two pinch rollers 2 and 3. before winding the fabric on a winding bar 4 rotatably mounted around its longitudinal axis between two arms 5 and 6 of a stirrup 7 secured to a ring gear 8 rotatably mounted in a circular slide
  • ⁇ IE. re 9 secured to the frame of the loom and engaged with a drive pinion 10 kinematically connected to the motor mechanism (not shown) intended to rotate the needle bed.
  • the winding bar 4 carries a pinion 12 (fig. 3) at one end engaged with a worm 13 of a direct drive motor 14 (fig. 1).
  • the electrical supply is provided by a double circular conductive track 11 against which two sensors 11a attached to the stirrup 7 rub.
  • the pinch rollers 2 and 3 are rotatably connected between two arms 15 and 16 of a tilting stirrup 17.
  • This stirrup 17 is articulated around an axis 18 passing through the generatrix of the roll 2 (fig. 2) to the 'place where knitting 1 leaves this roller 2, and so ⁇ lary two arms 19 and 20 of a second tilting stirrup 21 articulated around an axis 22 passing through the generatrix of the pinch roller 3 at the place where the knit 1 comes into contact with this rou ⁇ water, and secured to the arms 5 and 6 of the stirrup 7 secured to the ring gear 8.
  • Two bars 35 and 36 (fig. 1 and 2 ⁇ are fixed between the arms 19 and 20 of the stirrup 21 and serve to keep the direction of the force exerted by the strand of fabric extending from the roller constant. 2 to the winding bar 4 whatever the diameter of the fabric roll wound on this bar 4.
  • the pinch roller 2 is secured at one end (FIG. 4) to a pinion 23 engaged with an endless screw 24 of the shaft of a DC drive motor 25, and to its other end. mite (fig. 1) of a toothed reference 26 engaged with a toothed reference 27 secured to the pinch roller shaft 3.
  • a first force sensor 28 (fig. 2) constituted by a strain gauge is disposed between the stirrup 7 secured to the toothed ring 8 and the tilting stirrup 21 articulated around the axis 22 and a second sensor of force 29 is disposed between the tilting stirrup 21 and the tilting stirrup 17 articulated around the axis 18.
  • Fig. 5 illustrates an electronic circuit block diagram des ⁇ Tine slaving the speed of 14 or 25 to the force motor sensed by the sensors engine "strength 28 respectively 29.
  • the force sensor 28 is connected by a preamplifier 30 to one of the inputs of a differential amplifier 31, the other input of which is connected to a reference potentiometer 32 which is used to display a voltage characteristic of the desired force on the force sensor 28.
  • the output of the differential amplifier 31 is connected to a regulator 33 which is itself connected to a power amplifier 34 intended to supply the motor 14.
  • the principle of adjustment of the mechanism for winding the three-sided fabric consists in controlling the speed of the motor 14 to the tension of the knitting portion 1 extending from the pinch roller 2 to the knitting rou ⁇ l formed on the bar. 'winding 4 and to control the speed of the motor 25 to the tension of the knitted portion extending between the pinch roller 3 and the needles integral with the needle bed (not shown).
  • the pivot axis 18 of the tilting stirrup 17 being coincident with the generator of the pinching rou ⁇ 2 at the place where the knit 1 leaves this roll 2 and the knit passing successively under the roll 3 between the rollers 2 and 3 and on the roller 2, the torque exerted on the stirrup 17 around the articulation axis 18 is directly proportional to the tension of the portion of fabric extending between the roller 3 and the needles of the bed (not shown).
  • the tension of the knitting strand located between the roller 2 and the winding bar 4 is not in line with the fact that the lever arm of this force, the point of application of which coincides with the axis 18 is zero.
  • the course of the knitting between the pinch rollers 2 and 3 prevents to some extent the tension prevailing in the knitting strand extending between the roller 2 and the bar 4 from being transmitted to the other strand of the knitting located upstream of the roller 3. In any case, even if there is sliding of the knitting between the rollers 2 and 3, this results in a variation in tension of the tri ⁇ cot. So the force measured by the force sensor 29 is indeed characteristic of the moment corresponding to the product of the force exerted by the knitting strand 1 extending between the roller 3 and the needles of the tangential needle (not shown) ent to the roller 3, by the lever arm for applying this force relative to the pivot axis . of the caliper 17.
  • the voltage emitted by the force sensor 29 is proportional to this no- ment so that the differential amplifier 31 and the regulator 33 regulate the supply of the motor 25 as a function of the difference between the voltage emitted by the sensor 29 and that displayed by the reference potentiometer 32 and corresponding to the desired mechanical tension in the strand of the knitted fabric 1 extending upstream of the roller 3.
  • this supply voltage is adjusted by an electronic circuit identical to that of the motor 14 as a function of the reference voltage displayed on the potentiometer d setpoint 32 and corresponding to the desired mechanical tension in the strand of the knitted fabric 1 extending downstream of the roller 2.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)

Abstract

Two nip rolls (2, 3) are mounted between two arms of a stirrup (17) articulated about an axis (18) integral with a second stirrup (21) articulated about an axis (22). Said rolls are given by a motor (25) and the knitted fabric is rolled about a winding bar (4) driven by a motor (14). Two force sensors (28, 29) measure respectively the tension exerted by the knitted fabric (1) between the roll (3) and the bar (4) via the stirrup (21) articulated about the axis (22) and the tension exerted by the knitted fabric (1) between the roll (2) and the knitting machine needles via the stirrup (17) articulated about the axis (18). As the tensions of the knitted fabric are merged with the axes (18, 22), the tensions applied to those axes do not generate any torque to the levers articulated to said respective axes so that the motors (14, 25) set by the sensors (28, 29) adjust independently the tensions in the knitted fabric ends upstream and downstream of the rolls (2, 3).

Description

ME CAN I SME D'ENROULEME NT ME CAN I SME ENROULEME NT
D'UN T I S S U POUR MET I E R AFROM A T I S S U FOR MET I E R A
T R I C OTE R C I RC ULA I RET R I C OTE R C I RC ULA I RE
La présente invention a pour objet un mécanisme d'enroulement d'un tissu pour métier à tricoter circulaire comprenant au moins deux rouleaux de pincement du tissu disposés dans un plan horizon¬ tal et entre lesquels le tissu passe après avoir entouré une por- tion du premier rouleau et les quitte après avoir entrouré une por¬ tion du second rouleau, une barre de bobinage et des moyens d'en¬ traînement de ces rouleaux et de cette barre.The subject of the present invention is a mechanism for winding a fabric for a circular knitting machine comprising at least two rolls for pinching the fabric arranged in a horizontal plane and between which the fabric passes after having surrounded a portion of the first roller and leaves them after having surrounded a portion of the second roller, a winding bar and means for driving these rollers and this bar.
Les rouleaux de pincement du tissu ont pour rôle d'exercer une traction déterminée sur le tricot et d'assurer ainsi la régulari- té des mailles. Le rouleau de bobinage sert à recueillir le tricot avec une certaine tension qui assure une largeur régulière du pro¬ duit enroulé. On a déjà proposé de faire passer le tricot alterna¬ tivement dessous et dessus deux, voire trois rouleaux de pincement de manière que les frottements engendrés entre les rouleaux et le tissu réduisent le passage de la tension entre les brins situés au- dessus et au-dessous de ces rouleaux.The role of the fabric pinch rollers is to exert a determined pull on the knitted fabric and thus to ensure the regularity of the stitches. The winding roller is used to collect the knitted fabric with a certain tension which ensures a regular width of the wound product. It has already been proposed to pass the knitted fabric alternately below and above two or even three pinch rollers so that the friction generated between the rollers and the fabric reduces the passage of tension between the strands situated above and below. below these rollers.
D'une part, tout glissement du tricot n'est pas exclu à tra¬ vers les rouleaux de pincement, d'autre part, le diamètre du rou¬ leau de bobinage varie constamment ce qui suppose une vitesse d'en- traîne ent variable du rouleau de bobinage pour que la tension d'en¬ roulement soit constante.On the one hand, any slippage of the knitted fabric is not excluded through the pinch rollers, on the other hand, the diameter of the winding coil varies constantly, which implies a variable ent speed. of the winding roller so that the winding tension is constant.
Diverses solutions ont déjà été proposées pour tenter de ré¬ soudre ce problème. C'est ainsi que le brevet CH-A-501 084 se rap¬ porte à un dispositif de freinage magnétique coπprenant un aimant, un levier actionnant cet aimant et dont la position est fonction du diamètre du rouleau de tissu. Au fur et à mesure que ce diamè¬ tre croit, le levier approche l'aimant d'un taπbour solidaire de l'axe du rouleau de tissu et le freine.Various solutions have already been proposed in an attempt to solve this problem. This is how patent CH-A-501 084 relates to a magnetic braking device including a magnet, a lever actuating this magnet and the position of which depends on the diameter of the roll of fabric. As this diameter increases, the lever approaches the magnet of a valve integral with the axis of the fabric roll and brakes it.
Le brevet CH-A-539 156 est relatif à un dispositif dans lequelPatent CH-A-539,156 relates to a device in which
OMPI le rouleau d'extraction du tissu est cinématiquement solidaire de la fonture et est donc entraîné positivement à une vitesse propor¬ tionnelle à celle de la fonture. tïie telle solution ne résoud pas le problème du glissement possible du tissu entre les rouleaux de pincement ni celui de l'entraînement du rouleau de bobinage.WIPO the fabric extraction roller is kinematically integral with the needle bed and is therefore driven positively at a speed proportional to that of the needle bed. such a solution does not solve the problem of the possible sliding of the fabric between the pinch rollers or that of the drive of the winding roller.
On a déjà proposé d'asservir le couple d'un moteur à courant continu destiné à entraîner les rouleaux de pincement du tissu à la tension de ce tissu, dans le brevet US-A-4 236 390. La mesure de cette tension et le mode d'entraînement du rouleau de bobinage ne sent pas décrits dans ce document.It has already been proposed to control the torque of a direct current motor intended to drive the nip rollers of the fabric to the tension of this fabric, in patent US-A-4 236 390. The measurement of this tension and the winding roller drive mode does not feel described in this document.
Il apparaît qu'aucune solution n'a été proposée jusqu'ici pour résoudre le problème qui consiste d'une part à tirer sur les aiguil¬ les, d'autre part à enrouler le tricot à deux tensions respectives réglables indépendamment l'une de l'autre. Le but de la présente invention est précisément de résoudre ce problème.It appears that no solution has been proposed so far to solve the problem which consists on the one hand of pulling on the needle, on the other hand of winding the knitted fabric at two respective voltages independently adjustable one of the other. The object of the present invention is precisely to solve this problem.
A cet effet, cette invention a pour objet un mécanisme d'en¬ roulement d'un tissu pour machine à tricoter circulaire selon la revendication 1. Le dessin annexé illustre, sché atiquement et à titre d'exem¬ ple, une forme d'exécution du mécanisme objet de l'invention. La fig. 1 est une vue en perspective de ce mécanisme. La fig. 2 est une vue en coupe selon la ligne II-II de la fig. 1. La fig. 3 est une vue en coupe selon la ligne III-III de la fig. 1To this end, the subject of this invention is a mechanism for rolling up a fabric for a circular knitting machine according to claim 1. The attached drawing illustrates, atically dried and by way of example, a form of execution of the mechanism object of the invention. Fig. 1 is a perspective view of this mechanism. Fig. 2 is a sectional view along line II-II of FIG. 1. Fig. 3 is a sectional view along line III-III of FIG. 1
La fig. 4 est une vue en coupe selon la ligne IV-IV de la fi¬ gure 1.Fig. 4 is a sectional view along line IV-IV of FIG. 1.
La fig. 5 est un schéma-bloc du circuit électrique de commande des moteurs.Fig. 5 is a block diagram of the electric motor control circuit.
La fig. 1 n'illustre que le mécanisme d'enroulement du tricot produit par le métier à tricoter circulaire qui n'a pas été repré¬ senté. Ce tricot se présente sous la forme d'un tube 1 que l'on ap- platit entre deux rouleaux de pincement 2 et 3.avant d'enrouler le tissu sur une barre de bobinage 4 montée rotativement autour de son axe longitudinal entre deux bras 5 et 6 d'un étrier 7 solidaire d'une couronne dentée 8 montée rotativement dans une coulisse circulai-Fig. 1 only illustrates the knitting winding mechanism produced by the circular knitting loom which has not been shown. This knitting is in the form of a tube 1 which is flattened between two pinch rollers 2 and 3. before winding the fabric on a winding bar 4 rotatably mounted around its longitudinal axis between two arms 5 and 6 of a stirrup 7 secured to a ring gear 8 rotatably mounted in a circular slide
\IE. re 9 solidaire du bâti du métier et en prise avec un pignon d'en¬ traînement 10 relié cinématiquement au mécanisme moteur (non repré¬ senté) destiné à faire tourner la fonture. La barre de bobinage 4 porte un pignon 12 (fig. 3) à une extrémité en prise avec une vis sans fin 13 d'un moteur d'entraînement 14 à courant continu (fig. 1). L'alimentation électrique est fournie.par une double piste con¬ ductrice circulaire 11 contre laquelle frottent deux capteurs lia solidaires de l'étrier 7.\IE. re 9 secured to the frame of the loom and engaged with a drive pinion 10 kinematically connected to the motor mechanism (not shown) intended to rotate the needle bed. The winding bar 4 carries a pinion 12 (fig. 3) at one end engaged with a worm 13 of a direct drive motor 14 (fig. 1). The electrical supply is provided by a double circular conductive track 11 against which two sensors 11a attached to the stirrup 7 rub.
Les rouleaux de pincement 2 et 3 sont mntes rotativement en- tre deux bras 15 et 16 d'un étrier basculant 17. Cet étrier 17 est articulé autour d'un axe 18 passant par la génératrice du rouleau 2 (fig. 2) à l'endroit où le tricot 1 quitte ce rouleau 2, et so¬ lidaire de deux bras 19 et 20 d'un second étrier basculant 21 ar¬ ticulé autour d'un axe 22 passant par la génératrice du rouleau de pincement 3 à l'endroit où le tricot 1 entre en contact avec ce rou¬ leau, et solidaire des bras 5 et 6 de l'étrier 7 solidaire de la couronne dentée 8.The pinch rollers 2 and 3 are rotatably connected between two arms 15 and 16 of a tilting stirrup 17. This stirrup 17 is articulated around an axis 18 passing through the generatrix of the roll 2 (fig. 2) to the 'place where knitting 1 leaves this roller 2, and so¬ lary two arms 19 and 20 of a second tilting stirrup 21 articulated around an axis 22 passing through the generatrix of the pinch roller 3 at the place where the knit 1 comes into contact with this rou¬ water, and secured to the arms 5 and 6 of the stirrup 7 secured to the ring gear 8.
Deux barres 35 et 36 (fig. 1 et 2} sont fixées entre les bras 19 et 20 de l'étrier 21 et servent à maintenir constante la diirec- tion de la force excercée par le brin de tissu s'étendant du rou¬ leau 2 à la barre de bobinage 4 quel que soit le diamètre du rou¬ leau de tissu enroulé sur cette barre 4.Two bars 35 and 36 (fig. 1 and 2} are fixed between the arms 19 and 20 of the stirrup 21 and serve to keep the direction of the force exerted by the strand of fabric extending from the roller constant. 2 to the winding bar 4 whatever the diameter of the fabric roll wound on this bar 4.
Le rouleau de pincement 2 est solidaire à une extrémité (fig. 4) d'un pignon 23 en prise avec une vis sans fin 24 de l'arbre d'un moteur d'entraînement 25 à courant continu, et à son autre extré¬ mité (fig. 1) d'un renvoi denté 26 en prise avec un renvoi denté 27 solidaire de l'arbre du rouleau de pincement 3.The pinch roller 2 is secured at one end (FIG. 4) to a pinion 23 engaged with an endless screw 24 of the shaft of a DC drive motor 25, and to its other end. mite (fig. 1) of a toothed reference 26 engaged with a toothed reference 27 secured to the pinch roller shaft 3.
Un premier capteur de force 28 (fig. 2) constitué par une jau¬ ge de contrainte est disposé entre l'étrier 7 solidaire de l'anneau denté 8 et l'étrier basculant 21 articulé autour de l'axe 22 et un second capteur de force 29 est disposé entre l'étrier basculant 21 et l'étrier basculant 17 articulé autour de l'axe 18.A first force sensor 28 (fig. 2) constituted by a strain gauge is disposed between the stirrup 7 secured to the toothed ring 8 and the tilting stirrup 21 articulated around the axis 22 and a second sensor of force 29 is disposed between the tilting stirrup 21 and the tilting stirrup 17 articulated around the axis 18.
La fig. 5 illustre un schéma-bloc du circuit électronique des¬ tiné à asservir la vitesse du moteur 14 ou du moteur 25 à la for- ce captée par les capteurs de "force 28 respectivement 29. Etant don¬ né que le circuit d'asservissement est identique dans les deux cas, seul l'un de ces circuits est représenté et décrit. Le capteur de force 28 est relié par un préaπplificateur 30 à l'une des entrées d'un amplificateur différentiel 31 dont l'au¬ tre entrée est connectée à un potentiomètre de consigne 32 qui sert à afficher une tension caractéristique de la force désirée sur le capteur de force 28. La sortie de l'aπplificateur différentiel 31 est connectée à un régulateur 33 lui-même connecté à un amplifica¬ teur de puissance 34 destiné à alimenter le moteur 14.Fig. 5 illustrates an electronic circuit block diagram des¬ Tine slaving the speed of 14 or 25 to the force motor sensed by the sensors engine "strength 28 respectively 29. As don¬ born that the slaving circuit is identical in both cases, only one of these circuits is shown and described. The force sensor 28 is connected by a preamplifier 30 to one of the inputs of a differential amplifier 31, the other input of which is connected to a reference potentiometer 32 which is used to display a voltage characteristic of the desired force on the force sensor 28. The output of the differential amplifier 31 is connected to a regulator 33 which is itself connected to a power amplifier 34 intended to supply the motor 14.
Le principe de réglage du mécanisme d'enroulement du tissu tri¬ coté consiste à asservir la vitesse du moteur 14 à la tension de la portion de tricot 1 s'étendant du rouleau de pincement 2 au rou¬ leau de tricot formé sur la barre d'enroulement 4 et à asservir la vitesse du moteur 25 à la tension de la portion de tricot s'éten¬ dant entre le rouleau de pincement 3 et les aiguilles solidaires de la fonture (non représentée). En effet, l'axe de pivotement 18 de l'étrier basculant 17 étant confondu avec la génératrice du rou¬ leau de pincement 2 à l'endroit où le tricot 1 quitte ce rouleau 2 et le tricot passant successivement sous le rouleau 3 entre les rouleaux 2 et 3 et sur le rouleau 2, le couple exercé sur l'étrier 17 autour de l'axe d'articulation 18 est directement proportionnel à la tension de la portion de tissu s'étendant entre le rouleau 3 et les aiguilles de la fonture (non représentée). La tension du brin de tricot situé entre le rouleau 2 et la barre d'enroulement 4 n'en¬ tre pas en ligne de ccπpte du fait que le bras de levier de cette force dont le point d'application est confondu avec l'axe 18 est nul. En outre, le parcours du tricot entre les rouleaux de pince¬ ment 2 et 3 eπçêche dans une certaine mesure la tension régnant dans le brin de tricot s'étendant entre le rouleau 2 et la barre 4 de se transmettre à l'autre brin du tricot situé en amont du rouleau 3. De toute façon, même s'il y a glissement du tricot entre les rou- leaux 2 et 3, ceci se-traduit par une variation de tension du tri¬ cot. Donc la force mesurée par le capteur de force 29 est bien ca¬ ractéristique du moment correspondant au produit de la force exer¬ cée par le brin de tricot 1 s'étendant entre le rouleau 3 et les aiguilles de la fonture (non représentée) tangentielle ent au rou- leau 3, par le bras de levier d'application de cette force par rap¬ port à l'axe de basculement.de l'étrier 17. Par conséquent, la ten¬ sion émise par le capteur de force 29 est proportionnelle à ce no- ment de sorte que l'aπplificateur différentiel 31 et le régulateur 33 règlent l'alimentation du moteur 25 en fonction de l'écart en¬ tre la tension émise par le capteur 29 et celle affichée par le po¬ tentiomètre de consigne 32 et correspondant à la tension mécanique désirée dans le brin du tricot 1 s'étendant en amont du rouleau 3.The principle of adjustment of the mechanism for winding the three-sided fabric consists in controlling the speed of the motor 14 to the tension of the knitting portion 1 extending from the pinch roller 2 to the knitting rou¬ l formed on the bar. 'winding 4 and to control the speed of the motor 25 to the tension of the knitted portion extending between the pinch roller 3 and the needles integral with the needle bed (not shown). Indeed, the pivot axis 18 of the tilting stirrup 17 being coincident with the generator of the pinching rou¬ 2 at the place where the knit 1 leaves this roll 2 and the knit passing successively under the roll 3 between the rollers 2 and 3 and on the roller 2, the torque exerted on the stirrup 17 around the articulation axis 18 is directly proportional to the tension of the portion of fabric extending between the roller 3 and the needles of the bed (not shown). The tension of the knitting strand located between the roller 2 and the winding bar 4 is not in line with the fact that the lever arm of this force, the point of application of which coincides with the axis 18 is zero. In addition, the course of the knitting between the pinch rollers 2 and 3 prevents to some extent the tension prevailing in the knitting strand extending between the roller 2 and the bar 4 from being transmitted to the other strand of the knitting located upstream of the roller 3. In any case, even if there is sliding of the knitting between the rollers 2 and 3, this results in a variation in tension of the tri¬ cot. So the force measured by the force sensor 29 is indeed characteristic of the moment corresponding to the product of the force exerted by the knitting strand 1 extending between the roller 3 and the needles of the tangential needle (not shown) ent to the roller 3, by the lever arm for applying this force relative to the pivot axis . of the caliper 17. Consequently, the voltage emitted by the force sensor 29 is proportional to this no- ment so that the differential amplifier 31 and the regulator 33 regulate the supply of the motor 25 as a function of the difference between the voltage emitted by the sensor 29 and that displayed by the reference potentiometer 32 and corresponding to the desired mechanical tension in the strand of the knitted fabric 1 extending upstream of the roller 3.
Par contre, la force appliquée sur l'étrier 17 par ce brin du tissu s'étendant en amont du rouleau 3 étant confondue avec l'axe 22 de l'étrier 21, la force exercée par ce brin de tissu se décom¬ pose en deux forces appliquées respectivement sur l'axe 18 qui cons- titue le premier point d'appui de l'étrier 17 sur l'étrier 21 et sur le capteur 29, solidaire de l'étrier 21, constituant le second point d'appui. Ces forces se répartissent proportionnellement à leurs bras de levier respectifs par rapport au point d'application de la force, confondu avec l'axe 22 de l'étrier 21, aucun couple résul- tant n'est donc transmis à cet étrier 21 de sorte que cet étrier reste constamment en équilibre autour de son axe quelle que soit la force appliquée sur l'étrier 17 et que seul le capteur 29 mesu¬ re la force au second point d'appui de l'étrier 17 sans que cette force n'influence le capteur 28. Donc, le couple exercé sur l'étrier 21 est proportionnel à la seule force du brin de tricot s'étendant entre le rouleau 2 et la barre de bobinage 4. La force proportionnelle à ce couple mesuré par le capteur 28 sert à régler la tension d'alimentation du moteur 14. Comme décrit précédemment pour le moteur 25, cette tension d'a¬ limentation est réglée par un circuit électronique identique à ce¬ lui du moteur 14 en fonction de la tension de référence affichée sur le potentiomètre de consigne 32 et correspondant à la tension mécanique désirée dans le brin du tricot 1 s'étendant en aval du rouleau 2. On the other hand, the force applied to the stirrup 17 by this strand of the fabric extending upstream of the roller 3 being coincident with the axis 22 of the stirrup 21, the force exerted by this strand of fabric is decom¬ posed by two forces applied respectively on the axis 18 which constitutes the first support point of the stirrup 17 on the stirrup 21 and on the sensor 29, integral with the stirrup 21, constituting the second support point. These forces are distributed in proportion to their respective lever arms relative to the point of application of the force, coincident with the axis 22 of the stirrup 21, no resulting torque is therefore transmitted to this stirrup 21 so that this stirrup remains constantly in equilibrium around its axis whatever the force applied to the stirrup 17 and that only the sensor 29 measures the force at the second fulcrum of the stirrup 17 without this force being influences the sensor 28. Therefore, the torque exerted on the stirrup 21 is proportional to the only force of the knitting strand extending between the roller 2 and the winding bar 4. The force proportional to this torque measured by the sensor 28 is used to adjust the supply voltage of the motor 14. As described above for the motor 25, this supply voltage is adjusted by an electronic circuit identical to that of the motor 14 as a function of the reference voltage displayed on the potentiometer d setpoint 32 and corresponding to the desired mechanical tension in the strand of the knitted fabric 1 extending downstream of the roller 2.

Claims

REVE ND I CAT I ON S DREAM ND I CAT I ON S
1.Mécanisme d'enroulement de tissu pour métier à tricoter cir¬ culaire comprenant un support (5,6,7) monté rotativement autour d'un axe vertical et portant au moins deux rouleaux (2,3) de pincement du tissu (1) disposés dans un plan horizontal et entre lesquels le tissu passe après avoir entouré une portion du premier rouleau (3) et les quitte après avoir entouré une autre portion du second rou¬ leau (2), une barre de bobinage (4) et des moyens d'entraînement (14,25) de ces rouleaux (2,3) et de cette barre (4) caractérisé par le fait que les deux rouleaux de pincement (2,3) sont montés entre une première paire de bras parallèles (15,16) articulés autour d'un axe (18) passant par une génératrice audit second rouleau (2) à l'en¬ droit où le tissu (1) le quitte, cet axe étant solidaire d'une se¬ conde paire de bras parallèles (19,20) articulés autour d'un axe (22) solidaire audit support et passant par la génératrice du pre- mier rouleau (3) à l'endroit où le tissu (1) entre en contact avec celui-ci, et par le fait qu'il coπporte au moins un organe (29) pour mesurer la force entre la première paire de bras parallèles (15,16) , soumise à la tension du tissu en amont des rouleaux de pincement et la seconde paire de bras parallèles (19,20) et un organe (28) pour mesurer la force entre la seconde paire de bras parallèles, sounise à la tension du tissu en aval des rouleaux de pincement et ledit support (5,6,7) et deux dispositifs (30 à 34) pour cαrmander indépendaπment les moyens d'entraînement (25,14) des rouleaux de pincem≥nt (2,3) et ceux de la barre de bobinage (4) en fonction des- dites forces mesurées respectives.1.Mechanism for winding fabric for circular knitting loom comprising a support (5,6,7) rotatably mounted around a vertical axis and carrying at least two rollers (2,3) for pinching the fabric (1 ) arranged in a horizontal plane and between which the fabric passes after having surrounded a portion of the first roller (3) and leaves them after having surrounded another portion of the second roller (2), a winding bar (4) and drive means (14,25) of these rollers (2,3) and of this bar (4) characterized in that the two pinch rollers (2,3) are mounted between a first pair of parallel arms (15 , 16) articulated around an axis (18) passing through a generator to said second roller (2) at the right where the fabric (1) leaves it, this axis being integral with a second pair of arms parallels (19,20) articulated around an axis (22) integral with said support and passing through the generator of the first roller (3) at the place where the e fabric (1) comes into contact with it, and by the fact that it comprises at least one member (29) for measuring the force between the first pair of parallel arms (15,16), subjected to the tension of the fabric upstream of the pinch rollers and the second pair of parallel arms (19,20) and a member (28) for measuring the force between the second pair of parallel arms, under tension of the fabric downstream of the pinch rollers and said support (5,6,7) and two devices (30 to 34) for independently controlling the drive means (25,14) of the pinch rollers ≥ (2,3) and those of the winding bar (4 ) as a function of said respective measured forces.
2. Mécanisme selon la revendication 1, caractérisé par le fait que lesdits moyens d'entraînement sont constitués par des moteurs électriques (14,25) à courant continu et que ledit support (5,6,7) porte deux capteurs (lia) alimentés par une piste électriquement conductrice circulaire (U) concentrique audit support.2. Mechanism according to claim 1, characterized in that said drive means are constituted by electric motors (14,25) direct current and that said support (5,6,7) carries two sensors (lia) supplied by an electrically conductive circular track (U) concentric with said support.
3. Mécanisme selon la revendication 2, caractérisé par le fait que chacun desdits dispositifs (30-34) pour ccπmander indépendam¬ ment les moteurs (14,25) à courant continu comportent chacun une jauge de contrainte (28,29) un potentiomètre de consigne (32) un anplificateur différentiel (31) dont les entrées sont reliées res¬ pectivement à ladite jauge et audit potentiomètre, un régulateur (33) et un anplificateur de puissance (34). 3. Mechanism according to claim 2, characterized in that each of said devices (30-34) for ccπmander independently the motors (14,25) direct current each include a strain gauge (28,29) a potentiometer deposit (32) a differential amplifier (31), the inputs of which are connected respectively to said gauge and to said potentiometer, a regulator (33) and a power amplifier (34).
PCT/CH1984/000190 1983-12-06 1984-12-05 Fabric rolling mechanism for circular knitting machine WO1985002633A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6504/83-7 1983-12-06
CH650483 1983-12-06

Publications (1)

Publication Number Publication Date
WO1985002633A1 true WO1985002633A1 (en) 1985-06-20

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ID=4310658

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1984/000190 WO1985002633A1 (en) 1983-12-06 1984-12-05 Fabric rolling mechanism for circular knitting machine

Country Status (2)

Country Link
EP (2) EP0163703A1 (en)
WO (1) WO1985002633A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879886A (en) * 1987-05-01 1989-11-14 Gunze Limited Circular knitting machine
GB2351545A (en) * 1999-05-19 2001-01-03 Sipra Patent Beteiligung Adjustable width knitwear take-down roller

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06173146A (en) * 1992-10-09 1994-06-21 Fukuhara Seiki Seisakusho:Kk Driving apparatus for winding part in circular knitting machine
EP0622486A1 (en) * 1992-12-07 1994-11-02 Precision Fukuhara Works, Ltd Fabric take-up mechanism for circular knitting machines
US5730005A (en) * 1996-09-05 1998-03-24 Pai Lung Machinery Mill Co., Ltd. Fabric rolling-up device and control circuit assembly
IT1293791B1 (en) * 1997-07-25 1999-03-10 Santoni Srl CIRCULAR MACHINE FOR KNITTING OR HOSING WITH KNITTED FABRIC DRAWING DEVICE

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1267726A (en) * 1960-09-20 1961-07-21 Maschf Augsburg Nuernberg Ag Device for adjusting the tension of a paper web, in particular between the printing mechanisms of rotary machines by means of one or more driven feed rollers with continuously variable speed
GB1134169A (en) * 1966-03-22 1968-11-20 Gayley Wycombe Corp Improvement in take-up apparatus for textile fabric webs
US3842627A (en) * 1969-07-28 1974-10-22 Travis Mills Corp Means for rolling up tubular fabric produced by a circular knitting machine
DE2555948A1 (en) * 1975-12-12 1977-06-16 Schlafhorst & Co W Strip precoiling tension regulator - varies braking torque through roller lever by setting variable resistor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1267726A (en) * 1960-09-20 1961-07-21 Maschf Augsburg Nuernberg Ag Device for adjusting the tension of a paper web, in particular between the printing mechanisms of rotary machines by means of one or more driven feed rollers with continuously variable speed
GB1134169A (en) * 1966-03-22 1968-11-20 Gayley Wycombe Corp Improvement in take-up apparatus for textile fabric webs
US3842627A (en) * 1969-07-28 1974-10-22 Travis Mills Corp Means for rolling up tubular fabric produced by a circular knitting machine
DE2555948A1 (en) * 1975-12-12 1977-06-16 Schlafhorst & Co W Strip precoiling tension regulator - varies braking torque through roller lever by setting variable resistor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879886A (en) * 1987-05-01 1989-11-14 Gunze Limited Circular knitting machine
GB2351545A (en) * 1999-05-19 2001-01-03 Sipra Patent Beteiligung Adjustable width knitwear take-down roller
US6250114B1 (en) 1999-05-19 2001-06-26 Sipra Patententwicklungs- U. Beteiligungsgesellschaft Mbh Roller for guiding knitwear produced on a knitting machine and device constructed therewith
GB2351545B (en) * 1999-05-19 2003-08-13 Sipra Patent Beteiligung Roller for guiding knitwear produced on a knitting machine and device constructed therewith

Also Published As

Publication number Publication date
EP0163703A1 (en) 1985-12-11
EP0148727A1 (en) 1985-07-17

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