EP0307769B1 - Métier à tricoter avec dispositif de changement de fils - Google Patents

Métier à tricoter avec dispositif de changement de fils Download PDF

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Publication number
EP0307769B1
EP0307769B1 EP88114553A EP88114553A EP0307769B1 EP 0307769 B1 EP0307769 B1 EP 0307769B1 EP 88114553 A EP88114553 A EP 88114553A EP 88114553 A EP88114553 A EP 88114553A EP 0307769 B1 EP0307769 B1 EP 0307769B1
Authority
EP
European Patent Office
Prior art keywords
thread
knitting machine
machine according
length
knotting
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.)
Expired - Lifetime
Application number
EP88114553A
Other languages
German (de)
English (en)
Other versions
EP0307769A2 (fr
EP0307769A3 (fr
Inventor
Ernst-Dieter Plath
Eduard Steidle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sipra Patententwicklungs und Beteiligungs GmbH
Original Assignee
Sipra Patententwicklungs und Beteiligungs GmbH
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Filing date
Publication date
Application filed by Sipra Patententwicklungs und Beteiligungs GmbH filed Critical Sipra Patententwicklungs und Beteiligungs GmbH
Publication of EP0307769A2 publication Critical patent/EP0307769A2/fr
Publication of EP0307769A3 publication Critical patent/EP0307769A3/fr
Application granted granted Critical
Publication of EP0307769B1 publication Critical patent/EP0307769B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices
    • D04B15/62—Thread guides for circular knitting machines; Thread-changing devices with thread knotters
    • 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
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed

Definitions

  • the invention relates to a knitting machine of the type specified in the preamble of claim 1.
  • knotting devices are increasingly used as thread changing devices, in which the new thread is knotted on the old thread when the thread is changed.
  • precisely localized thread change points can be achieved in the knitted fabric, which is particularly advantageous when changing colors.
  • control technology however, the problem arises of controlling the knotting device and the thread feed so that the knot also appears exactly at the desired thread change point in the knitted fabric.
  • the previously known devices for solving the problem mentioned have the disadvantage that a larger number of sensors is required and, accordingly, a larger number of measurement data must be taken into account in the control device, which complicates the structure of the control device.
  • the thread changing device is provided with a positive working thread delivery device in the form of a so-called tape feeder at a point located behind the knotting device in the thread running direction (DE-A-30 15 191)
  • the slip inevitably associated with such feeders has the consequence that the knot becomes loose gradually shifting more and more in the knitted fabric, so that e.g. In the case of a circular knit fabric, all the knots together form a helically wound line.
  • only smooth knitwear can be made with positive feeders.
  • the storage drum and the winding element are operated in the manner of a control device, which is intended to ensure a thread part of constant length on the storage drum, in that the quantity of thread delivered to the thread processing point by the thread delivery device and withdrawn from the storage drum is supplied again by the winding element.
  • a knotting device is used, the thread part arranged in it having to be stopped briefly at the moment of the actual knot formation or moved at a reduced speed. This is made possible in that the motor for the winding element is stopped during the actual knot formation and, after the knot formation has been completed, is operated for a time faster than the current thread speed.
  • the known device is not free from defects.
  • a major deficiency is, for example, that it is only suitable for the production of ring patterns consisting of horizontal stripes, because a positive thread feed takes place by means of the delivery device and therefore the thread consumption on each needle must be the same.
  • Another major defect is that the device cannot work properly in the long run because sensors are used to measure the thread parts unwound from or wound onto the storage drum, which sensors of the thread delivery device or are assigned to the winding element. If one of the two sensors produces a slight measurement error, then this error is continuously added up, resulting in a sum error and the differential signal used for controlling the motor of the winding element becoming increasingly incorrect.
  • the invention has for its object to simplify the control device for the thread changing device in a knitting machine of the type mentioned without thereby reducing its accuracy and operational reliability.
  • the displacement sensor has the additional advantage that each of its impulses denotes a specific point on the needle bed.
  • a simplification of the signal evaluation and thus also the construction of the control device can be achieved with a displacement sensor, which additionally delivers a zero pulse after each path length, which corresponds to the total length of a needle bed, i.e. in circular knitting machines of a needle cylinder revolution, so that the pulses are new for each distance Zero to be enumerated.
  • This measure ensures that an error that may occur on a route, for example a displacement of a knot position in the knitted fabric, is not passed on to the subsequent routes. So errors could not add up.
  • a knotting device can be controlled so reliably that it is not necessary to control the control device by locating the knot position in the knitted fabric, which is difficult to implement.
  • the thread storage device mentioned above is to be understood primarily as storage drums over which the thread is laid in several turns.
  • These Storage drums can be arranged in so-called feeders and can either be designed as continuously driven or stationary storage drums.
  • the storage drums do not form real thread stores, but instead cause a positive thread feed to the thread processing point by a movement dependent on the respective operating speed of the knitting machine and the thread consumption, where the thread is accordingly fed with a constant tension and thread quantity.
  • the drum forms a real thread storage device, on which the thread is wound up by means of a first thread finger and unwound by means of a second thread finger.
  • the same number of turns is always observed, which can be ensured in a thread storage device with a fixed storage drum by forcing the winding fingers to perform a synchronous movement, for example the second
  • the winding finger is set in rotation by the thread pull exerted by the processing needles and is moved past a pulse generator, the pulses of which actuate a stepping motor that moves the first winding finger and forces the first winding finger to deliver threads onto the storage drum synchronously.
  • a further simplification of the control device can be achieved in that parts of the control device are arranged on the individual knotting devices, for example an adjustable thread length storage device and of course sensors which detect the position of knotting device parts can monitor.
  • the thread length between the knotting device and the thread processing point can be different for the several knotting devices. It and the thread length required for a desired stitch length are measured on each knotting device before the start of the knitting process and individually entered into the thread length memory on the individual knotting devices or on the central control device.
  • a knotting device 10 of a thread changing device is shown only schematically as a box.
  • the individual structure of the knotting device is of no interest here.
  • the knotting device is supplied with four threads 11, 12, 13 and 14, between which it is possible to switch by tying a selected new thread to the thread previously used, for example 11.
  • the thread 11-14 selected in each case is guided from the knotting device 10 via a so-called positive feeder 15 to a thread processing point 16 of a circular knitting machine indicated schematically by its needle cylinder 17.
  • the thread is laid in several twists over a storage drum 18, which is driven by means of a drive belt 19 depending on the thread consumption and on the speed of rotation of the needle cylinder 17 of the circular knitting machine.
  • the respective thread 11-14 of the thread processing point 16 is forcibly fed in the required amount and thus tangentially with a constant tension.
  • the positive drive of the storage drum 18 ensures that the same amount of thread is always rewound onto the storage drum 18 as is drawn off tangentially from the storage drum 18 at the lower end. Accordingly, at any operating speed of the needle cylinder 17, the length of the thread, which extends from the knotting device 10 via the positive feeder 15 to a thread processing point 16 of the circular knitting machine, is always the same size.
  • Each system has a storage drum and each storage drum carries the same number of thread turns.
  • Circular knitting machines are predominantly multi-system, and each system can be assigned its own knotting device 10. All knotting devices 10 of a circular knitting machine are coupled to a common control device 20, but each have their own control part 21, which is part of the overall control device of the circular knitting machine.
  • the control device 20 includes a displacement encoder, which in the circular knitting machine shown is designed as an angle rotary encoder 22 and is drivingly coupled to the rotating needle cylinder 17 of the circular knitting machine.
  • the rotary encoder delivers a fixed number of pulses over a full revolution of the needle cylinder 17 and, after a full revolution of the needle cylinder, a zero pulse via a control line 23 in the central control device 20 and in the control parts 21.
  • the control device 20 has a special one for each connected knotting device 10 and its control part 21 Interface on. Via a first control connection 24, the knotting device 10 receives command impulses from the central control device 20, which comprises a microprocessor (not shown) and a pattern memory, if knotting is to be carried out. In addition, 24 feedback signals of the knotting device 10 are passed to the control device 20 via this connection.
  • the control part 21 of the knotting device 10 receives the clock pulses of the angle rotary encoder via a second control connection 25, and the zero pulse supplied by the angle rotary encoder 22 via a third control connection 26.
  • At least one adjustable thread length memory can be accommodated in the control part 21 of each knotting device 10 in a manner not shown, and at least one counting stage actuated by the clock pulses of the angular rotary encoder and its zero pulse is arranged.
  • the control part 21 can also have its own microprocessor which from the signals supplied by the central control device 20, taking into account individual switching delay times in the individual knot devices 10, the time of the trigger signal for knot formation is determined as a function of speed. The machine speed is determined from the clock pulses / time unit of the encoder.
  • a central microprocessor can also be accommodated in the control device 20, to which the data set on the control part 21 of each knot device is fed and which then calculates the trigger signals for knotting device 10 and delivers them in a timely manner.
  • the number of pulses of the rotary encoder over a full revolution of the needle cylinder 17 is fixed, regardless of the diameter of the needle cylinder and its needle pitch.
  • the control device can thus be used on any circular knitting machine without major adjustment problems.
  • the counting stage in the control part 21 of each knotting device 10 is reset to zero after each revolution of the needle cylinder 17.
  • the instantaneous speed of the knitting machine can be calculated at any time from the clock pulses of the angle rotary encoder 22 and taken into account when determining the time of knot formation.
  • the thread consumption per needle during stitch formation is also recorded in the pattern memory, and accordingly that is proportional to the drive of the Needle cylinder 17 set drive speed of the positive feeder 18 is set.
  • the control device described can be used to produce striped goods and inlaid goods in which the knots appearing in different rows of stitches lie exactly vertically one below the other or are placed at specific points.
  • FIG. 2 shows the design of the thread changing device for circular knitting machines on which jacquard patterns are to be produced, where, in contrast to the exemplary embodiment according to FIG. 1, where constant thread consumption has always been assumed at all needle processing points 16, the thread consumption at the individual thread processing points 16 fluctuates.
  • a thread processing point 16 is indicated schematically by a needle and the same reference numbers are used for all the same parts as in FIG. 1.
  • the device differs from the device according to FIG. 1 essentially in that instead of a positive feeder 15, a real storage feeder 30 is provided, which has a stationary storage drum 18 '. Each coming from the knotting device 10 thread 11-14 is wound onto the fixed thread drum 18 'by means of a first drivable winding finger 31.
  • the thread is drawn off from the fixed storage drum 18 'and passed to a thread processing point 16.
  • the thread can be drawn off by forcibly driving the second winding finger 32.
  • the rotational movement of the second Winding finger 32 is caused by the tension exerted on the thread 11 by the needles at the thread processing point 16.
  • Each rotational movement of the second winding finger 32 is determined on a moving disc 33 by means of sensors 34. With pulses supplied by the sensors 34, a forced drive of the first winding finger 31 is effected via a drive motor, not shown in FIG .
  • a gear 35 which is only indicated schematically, ensures that the storage drum is fixed in the case of rotating winding fingers.
  • Fig. 3 shows a possible embodiment of a memory feeder 30 '.
  • the fixed storage drum 18 ' is arranged and the two winding fingers 31 and 32 are rotatably mounted coaxially to the storage drum 18'.
  • the first winding finger 31 is driven by means of a stepping motor 37 arranged in the carrier 36, to which it is connected in terms of drive via an endless toothed belt 38.
  • the second winding finger 32 is fixedly connected to an aluminum disk 33, which can be serrated at its edge and generates pulses during the rotation of the winding finger in an optical sensor 34, which is acted upon by a light source 39, which drives the stepping motor 37 and thus the first winding finger 31 can be used.
  • the aluminum disc serves 33 as an eddy current brake disc in cooperation with a winding 40.

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

Claims (9)

  1. Machine à tricoter comprenant un bâti à aiguilles (17) et un dispositif de changement de fils comprenant au moins un dispositif de nouage (10), un dispositif de stockage de fil (15, 30), qui est disposé entre le dispositif de nouage (10) et un poste de traitement de fil (16) de la machine à tricoter, et un dispositif de commande, (20, 21) pour le dispositif de changement de fils, qui présente un microprocesseur et une mémoire de données de noeuds, et auquel appartient un détecteur qui délivre des impulsions dépendantes du mouvement d'une partie de la machine, mais indépendantes de l'espacement des aiguilles du bâti à aiguilles (17), caractérisée en ce que la longueur du fil (11-14), guidé par le dispositif de stockage de fil (15, 30) entre chaque dispositif de nouage (10) et le poste de traitement de fil (16) qui lui est associé, est maintenue à une valeur constante stockée dans une mémoire du dispositif de commande (20, 21), en ce que le détecteur délivrant les impulsions dépendantes du mouvement est un capteur de déplacement (22) ayant un nombre d'impulsions déterminé par unité de longueur de déplacement, et en ce qu'à chaque dispositif de nouage (10) est relié en outre, en tant que partie du dispositif de commande (21), un étage de comptage, ou une autre mémoire de longueur de déplacement, synchronisé par le capteur de déplacement (22) et remis en position initiale par une impulsion nulle.
  2. Machine à tricoter selon la revendication 1, caractérisée en ce que le capteur de déplacement délivre une impulsion nulle après chaque longueur de déplacement, qui correspond à la longueur totale d'un bâti à aiguilles.
  3. Machine à tricoter circulaire selon la revendication 1 ou 2, caractérisée en ce que le capteur de déplacement est un capteur angulaire (22) ayant un nombre d'impulsions déterminé par rotation de la machine, lequel délivre au moins une impulsion nulle dans une position périphérique déterminée de la machine.
  4. Machine à tricoter selon l'une des revendication 1 à 3, caractérisée en ce que le dispositif de stockage de fil (15) est un fournisseur de fil, entraîné en dépendance de la consommation de fil et/ou de la vitesse de la machine, pour fournir une alimentation positive de fil au poste de traitement de fil (16), dont la bobine entraînée de stockage de fil (18) porte un nombre déterminé de spires de fil.
  5. Machine à tricoter selon l'une des revendication 1 à 3, caractérisée en ce que le dispositif de stockage de fil (30) présente une bobine fixe de stockage de fil (18'), un premier doigt de bobinage pour l'enroulement d'un fil (11-14) sur la bobine de stockage de fil (18') et un deuxième doigt de bobinage (32) pour le déroulement du fil (11-14) de la bobine de stockage de fil (18'), et en ce que les deux doigts de bobinage (31, 32) sont actionnables en synchronisme.
  6. Machine à tricoter selon la revendication 5, caractérisée en ce que le deuxième doigt de bobinage (32) est déplaçable devant un capteur d'impulsions (34) dont les impulsions actionnent un moteur pas à pas (37) déplaçant le premier doigt de bobinage (31).
  7. Machine à tricoter selon l'une des revendications 1 à 6, caractérisée en ce qu'à chaque dispositif de nouage (10) est relié, en tant que partie du dispositif de commande (20/21), au moins un stockeur réglable de longueur de fil et des détecteurs surveillant la position de parties du dispositif de nouage.
  8. Machine à tricoter selon l'une des revendications 1 à 7, caractérisée en ce que le dispositif central de commande (20) ou les éléments du dispositif de commande (21) présentent en outre un stockeur réglable de longueur de fil pour la longueur de fil par maille.
  9. Machine à tricoter selon la revendication 5 ou 6, caractérisée en ce que le deuxième doigt de bobinage (32) est couplé à un frein à courants de Foucault (33/40).
EP88114553A 1987-09-18 1988-09-07 Métier à tricoter avec dispositif de changement de fils Expired - Lifetime EP0307769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873731379 DE3731379A1 (de) 1987-09-18 1987-09-18 Strickmaschine mit fadenwechseleinrichtung
DE3731379 1987-09-18

Publications (3)

Publication Number Publication Date
EP0307769A2 EP0307769A2 (fr) 1989-03-22
EP0307769A3 EP0307769A3 (fr) 1991-08-28
EP0307769B1 true EP0307769B1 (fr) 1996-02-21

Family

ID=6336302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88114553A Expired - Lifetime EP0307769B1 (fr) 1987-09-18 1988-09-07 Métier à tricoter avec dispositif de changement de fils

Country Status (6)

Country Link
US (1) US5131244A (fr)
EP (1) EP0307769B1 (fr)
JP (1) JPH0197247A (fr)
DD (1) DD282481A5 (fr)
DE (1) DE3731379A1 (fr)
ES (1) ES2086292T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024128950A1 (fr) * 2022-12-14 2024-06-20 Vandewiele Sweden Ab Passe-fil, en particulier pour fils lourds

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2816784B2 (ja) * 1992-06-17 1998-10-27 株式会社島精機製作所 横編機の糸加工位置制御方法および装置
EP0673914A3 (fr) * 1994-03-25 1995-11-22 Ube Industries Préparation d'esters d'alpha-céto-acides.
SE506798C2 (sv) * 1995-05-19 1998-02-16 Ericsson Telefon Ab L M Förfarande och anordning för att överföra signaler i en optofiber
SE516643C2 (sv) * 2000-05-31 2002-02-05 Tetra Laval Holdings & Finance Förfarande och anordning för framställning av ett gasformigt medium
JP2004156184A (ja) * 2002-11-08 2004-06-03 Murata Mach Ltd 編機
JP2009273675A (ja) * 2008-05-15 2009-11-26 Datsukusu:Kk 染色式刺繍機

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE1276974B (de) * 1965-06-12 1968-09-05 Frisch Kabel Und Verseilmaschb Abzug- und Speichervorrichtung fuer durchlaufendes strangfoermiges Gut
US3737112A (en) * 1971-04-23 1973-06-05 Wesco Industries Corp Yarn feeding and storage device for textile producing machine
DE3015191C2 (de) * 1980-04-19 1983-03-03 Schaffhauser Strickmaschinenfabrik, Schaffhausen Fadenwechselvorrichtung für Textilmaschinen, insbesondere Rundstrick- und Rundwirkmaschinen
DE3264870D1 (en) * 1981-04-16 1985-08-29 Iro Ab Knitting machine for the production of a striped fabric
CH643015A5 (fr) * 1981-12-03 1984-05-15 Mayer & Cie Maschinenfabrik Metier a tricoter.
DE3416195C2 (de) * 1984-05-02 1987-01-08 Gustav 7290 Freudenstadt Memminger Fadenliefervorrichtung für fadenverarbeitende Textilmaschinen, bspw. Rundstrick- oder -wirkmaschinen
DE3431743C2 (de) * 1984-08-29 1986-11-27 Christian Montopoli Val d'Arno Bretscher Vorrichtung zur Fadenzuführung für eine Strickmaschine
CH664776A5 (fr) * 1985-06-21 1988-03-31 Stoll & Co H Dispositif de selection de fils pour metier a tricoter.
DE3619105A1 (de) * 1986-06-06 1987-12-10 Christian Schwabe Fadenwechsel-verfahren fuer textilmaschinen
DE3627731C1 (de) * 1986-08-16 1988-03-31 Gustav Memminger Fadenliefervorrichtung mit elektronischer Fadenspannungsregelung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024128950A1 (fr) * 2022-12-14 2024-06-20 Vandewiele Sweden Ab Passe-fil, en particulier pour fils lourds

Also Published As

Publication number Publication date
US5131244A (en) 1992-07-21
EP0307769A2 (fr) 1989-03-22
JPH0149818B2 (fr) 1989-10-26
DD282481A5 (de) 1990-09-12
DE3731379A1 (de) 1989-04-06
DE3731379C2 (fr) 1992-05-07
JPH0197247A (ja) 1989-04-14
EP0307769A3 (fr) 1991-08-28
ES2086292T3 (es) 1996-07-01

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