EP0307769A2 - 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
EP0307769A2
EP0307769A2 EP88114553A EP88114553A EP0307769A2 EP 0307769 A2 EP0307769 A2 EP 0307769A2 EP 88114553 A EP88114553 A EP 88114553A EP 88114553 A EP88114553 A EP 88114553A EP 0307769 A2 EP0307769 A2 EP 0307769A2
Authority
EP
European Patent Office
Prior art keywords
thread
knitting machine
control device
machine according
length
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.)
Granted
Application number
EP88114553A
Other languages
German (de)
English (en)
Other versions
EP0307769A3 (fr
EP0307769B1 (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
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 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 with a thread changing device with at least one knotting device, with a thread storage device which is arranged between the knotting device and a thread processing point of the knitting machine, and with a control device having a microprocessor and a knot data memory for the thread changing device, to which a sensor belongs, which provides impulses dependent on the movement of a machine part.
  • knotting devices are increasingly used as thread changing devices, in which the new thread is knotted onto 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 there is the problem that To control 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 control 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 invention is accordingly based on the object of simplifying 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 object is achieved in a knitting machine with the devices mentioned at the outset in that the length of the thread passed over the thread storage device between each knotting device and the thread processing point assigned to it is kept at a constant value recorded in a memory of the control device, and in that the the sensor which provides the movement-dependent impulses is a path transmitter which is independent of the needle pitch of a needle bed and has a fixed number of impulses per path length unit.
  • 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 that 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, such as a shift 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, which is difficult to implement, by locating the knot position in the knitted fabric.
  • the thread storage device mentioned above primarily means 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, depending 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 when the storage drum is stationary, the drum forms a real thread store, 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 memory 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 respectively selected thread 11-14 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 turns over a storage drum 18 which is driven by means of a drive belt 19 depending on the thread consumption and on the rotational speed 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 sensor, 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 angular 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 into the central control device 20 and into 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 routed 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.
  • each knotting device 10 at least one adjustable thread length memory can be accommodated in a manner not shown, and at least one counting stage actuated by the clock pulses of the angle 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 are fed and which then calculates the trigger signals for knot formation and delivers them in good time for each knot device 10.
  • 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 rotation 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 a 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 numerals 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 ensures that the storage drum is stationary when the winding fingers are rotating.
  • 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 disc 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 alumi serves nium disc 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)
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
DE3731379 1987-09-18
DE19873731379 DE3731379A1 (de) 1987-09-18 1987-09-18 Strickmaschine mit fadenwechseleinrichtung

Publications (3)

Publication Number Publication Date
EP0307769A2 true EP0307769A2 (fr) 1989-03-22
EP0307769A3 EP0307769A3 (fr) 1991-08-28
EP0307769B1 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
EP0574881A1 (fr) * 1992-06-17 1993-12-22 Shima Seiki Mfg., Ltd. Dispositif et procédé pour le contrôle de la position de traitement de fil dans un métier à tricoter rectiligue

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5523459A (en) * 1994-03-25 1996-06-04 Ube Industries, Ltd. Preparation of α-keto acid ester
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
WO2024128950A1 (fr) * 2022-12-14 2024-06-20 Vandewiele Sweden Ab Passe-fil, en particulier pour fils lourds

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015191A1 (de) * 1980-04-19 1981-11-05 Schaffhauser Strickmaschinenfabrik, Schaffhausen Fadenwechselvorrichtung fuer textilmaschinen, insbesondere rundstrick- und rundwirkmaschinen
WO1982003642A1 (fr) * 1981-04-16 1982-10-28 Jacobsson Kurt Arne Gunnar Procede d'alimentation en fils de differentes couleurs d'une machine a tricoter, et machine a tricoter pour la mise en oeuvre du procede
DE3620296A1 (de) * 1985-06-21 1987-01-02 Stoll & Co H Fadenauswaehlvorrichtung fuer strickmaschinen
DE3619105A1 (de) * 1986-06-06 1987-12-10 Christian Schwabe Fadenwechsel-verfahren fuer textilmaschinen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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
CH643015A5 (fr) * 1981-12-03 1984-05-15 Mayer & Cie Maschinenfabrik Metier a tricoter.
DE3416195A1 (de) * 1984-05-02 1985-11-14 Gustav 7290 Freudenstadt Memminger Fadenliefervorrichtung fuer 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
DE3627731C1 (de) * 1986-08-16 1988-03-31 Gustav Memminger Fadenliefervorrichtung mit elektronischer Fadenspannungsregelung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015191A1 (de) * 1980-04-19 1981-11-05 Schaffhauser Strickmaschinenfabrik, Schaffhausen Fadenwechselvorrichtung fuer textilmaschinen, insbesondere rundstrick- und rundwirkmaschinen
WO1982003642A1 (fr) * 1981-04-16 1982-10-28 Jacobsson Kurt Arne Gunnar Procede d'alimentation en fils de differentes couleurs d'une machine a tricoter, et machine a tricoter pour la mise en oeuvre du procede
DE3620296A1 (de) * 1985-06-21 1987-01-02 Stoll & Co H Fadenauswaehlvorrichtung fuer strickmaschinen
DE3619105A1 (de) * 1986-06-06 1987-12-10 Christian Schwabe Fadenwechsel-verfahren fuer textilmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574881A1 (fr) * 1992-06-17 1993-12-22 Shima Seiki Mfg., Ltd. Dispositif et procédé pour le contrôle de la position de traitement de fil dans un métier à tricoter rectiligue
US5369966A (en) * 1992-06-17 1994-12-06 Shima Seiki Manufacturing Limited Method and apparatus for yarn processing position control of flat knitting machine

Also Published As

Publication number Publication date
JPH0197247A (ja) 1989-04-14
EP0307769A3 (fr) 1991-08-28
DE3731379A1 (de) 1989-04-06
DD282481A5 (de) 1990-09-12
DE3731379C2 (fr) 1992-05-07
US5131244A (en) 1992-07-21
JPH0149818B2 (fr) 1989-10-26
EP0307769B1 (fr) 1996-02-21
ES2086292T3 (es) 1996-07-01

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