EP1529862B1 - Procédé de redémarrage d'un métier à tisser après un arrêt et/ou un changement de position de la chaîne - Google Patents

Procédé de redémarrage d'un métier à tisser après un arrêt et/ou un changement de position de la chaîne Download PDF

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Publication number
EP1529862B1
EP1529862B1 EP03425726A EP03425726A EP1529862B1 EP 1529862 B1 EP1529862 B1 EP 1529862B1 EP 03425726 A EP03425726 A EP 03425726A EP 03425726 A EP03425726 A EP 03425726A EP 1529862 B1 EP1529862 B1 EP 1529862B1
Authority
EP
European Patent Office
Prior art keywords
loom
image
initial
restarting
adjustment
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
EP03425726A
Other languages
German (de)
English (en)
Other versions
EP1529862A1 (fr
Inventor
Giuseppe Casarotto
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.)
Promatech SpA
Original Assignee
Promatech SpA
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 Promatech SpA filed Critical Promatech SpA
Priority to ES03425726T priority Critical patent/ES2287442T3/es
Priority to DE60313619T priority patent/DE60313619T2/de
Priority to EP03425726A priority patent/EP1529862B1/fr
Priority to AT03425726T priority patent/ATE361385T1/de
Publication of EP1529862A1 publication Critical patent/EP1529862A1/fr
Application granted granted Critical
Publication of EP1529862B1 publication Critical patent/EP1529862B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J1/00—Auxiliary apparatus combined with or associated with looms
    • D03J1/007—Fabric inspection on the loom and associated loom control
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/002—Avoiding starting marks
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/007—Loom optimisation

Definitions

  • the present invention relates to a method for controlling the starting position of a weaving loom after stopping, in particular a method for restarting the weaving loom after stopping in view of an adjustment.
  • the rotation angle described by the main shaft of the loom during down time i.e. during the time between two steady conditions
  • is tracked for example by means of an encoder, to be later reproduced backwards by the main motor.
  • this approach should achieve the desired result, especially thanks to the inherent control accuracy of modern encoders and electric motors.
  • phase displacement between initial "mechanical” condition and initial “textile” condition may also be of a minimal extent (being the larger, the more elastic the yarn is), but in any case it inevitably causes defects in the fabric (commonly referred to as “overhead beating” defects and "open space in cloth”) which it is desirable to eliminate.
  • JP04-065555 discloses a method for restarting a weaving loom, whereby after stopping the loom an adjustement on the mechanical members of the loom is carried out on the basis of a textile phase displacement measured by comparing first and second image obtained by a image sensor.
  • a warp chain runs from a let-off cylinder to a fabric-tensioning roller passing through the weaving area where the weaving machine is located.
  • the position in which the fabric is actually originated corresponds with the reed beating line, i.e. the line along which the last weft thread inserted is beaten onto the cloth.
  • an image acquisition device or camera capable of taking up at least a portion of the fabric travelling in front of a window frame which is fixed with respect to the loom reference, preferably a small window frame of limited size, advantageously smaller than 10x10 cm and, for example, measuring about 2x2 cm.
  • the image of the fabric preferably in a digital format, is then managed and processed, for example keeping only a thin linear scanned image thereof in the warp direction.
  • the image of the fabric is acquired at preset times by a digital taking up system, for example the acquisition device described in the Italian patent application simultaneously filed by the same Applicant.
  • the method of the invention provides that, when the loom is stopped for the required adjustments, a digital image of the framed fabric portion is acquired through the taking up device: such digital image is kept at least temporarily in a memory area, for example either in a RAM of a suitable integrated circuit, or in a RAM or a hard disk of a computer connected to the acquisition device.
  • the loom is brought back to the conditions in which it was at the time of stopping, using known methods, for example causing the loom motor to reproduce backwards the rotation angle detected by an encoder integral with the main shaft.
  • the loom control system instructs the taking up device to acquire a second image of the framed fabric portion, which is compared against the first image stored in the memory area.
  • the comparison between the two images occurs by means of suitable numerical algorithms so that it may be established whether there is a perfect match - except for a tolerance factor set beforehand - or whether the two images are so different that adjustment is required.
  • the amount and direction of correction is obtained by which the warp chain must be shifted to bring the leading edge of the cloth back to exactly the same position it was in when the loom was stopped.
  • the numerical comparison between the two digital images can be performed in a variety of ways, some of which are immediately available to a person skilled in the field of computerised anti-counterfeiting systems.
  • a possible comparison method for example, consists in identifying the position of light intensity peaks in each image compared against a fixed reference, for example the edge of the acquisition window frame of the taking up device: from the difference in the peak positions in the two images and from the enlarging rate at which the fabric image is acquired, it is possible to determine the amount and direction by which the loom must be moved forwards or backwards, with respect to the mechanical condition existing at the time when the loom was stopped, in order to reset the initial "textile" condition.
  • the measure of the adjustment processed by the central control system of the loom on the basis of the comparison of the two images and transmitted to the loom motors, can be slightly larger than that calculated strictly on the basis of the phase shift existing between the two images, for example to take into account the elasticity of the actual warp chain and the remarkable friction existing between the cloth and the bench in nearly static conditions.
  • the adjustment is carried out through two or more iterative steps between which the image comparison phase is repeated.
  • the fabric portion whose image is acquired lies in a position as close as possible to the leading edge of the cloth, so as to increase accuracy when resetting the initial conditions: in fact, this avoids residual positioning errors deriving from the elasticity of the cloth portion between the acquisition window frame and the beating line.
  • control system provides to restart the loom.
  • the set objects are thus achieved, since the method allows to reset - after loom stopping and adjustment intervention affecting a displacement of the warp chain - not only the initial "mechanical” condition, but also - most importantly - the initial "textile” condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (5)

  1. Procédé pour redémarrer un métier à tisser lors d'une intervention de réglage impliquant le décalage du maillage de chaîne, caractérisé en ce que, après l'arrêt du métier, on effectue les étapes suivantes :
    (a) on effectue l'acquisition d'une première image d'une partie de tissu dans une position fixe par rapport au métier ;
    (b) on effectue l'intervention de réglage et l'on restaure les conditions mécaniques initiales du métier ;
    (c) on effectue l'acquisition d'une seconde image du tissu dans ladite position fixe par rapport au métier ;
    (d) on compare l'une à l'autre les première et seconde images pour établir la mesure d'un quelconque déphasage existant de textile ;
    (e) on effectue un réglage des éléments mécaniques du métier à tisser sur la base de ladite mesure du déphasage de textile pour restaurer l'état initial de textile ;
    (f) on redémarre le métier, caractérisé en ce que, après l'étape (e), on répète de nouveau les étapes (c) à (e) pour obtenir une convergence itérative de l'état initial souhaité de textile.
  2. Procédé selon la revendication 1, dans lequel, après l'étape (e), on restaure de nouveau les conditions mécaniques initiales du métier.
  3. Procédé selon la revendication 1 ou 2, dans lequel ladite position fixe est aussi proche que possible de la ligne de battage de peigne.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel ladite partie de tissu est mise en image sur une zone mesurant environ 2 x 2 cm.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdites images sont des images numériques, et ladite étape de comparaison est effectuée selon des algorithmes mathématiques.
EP03425726A 2003-11-10 2003-11-10 Procédé de redémarrage d'un métier à tisser après un arrêt et/ou un changement de position de la chaîne Expired - Lifetime EP1529862B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES03425726T ES2287442T3 (es) 2003-11-10 2003-11-10 Metodo para reiniciar un telar despues de una parada y/o un cambio de posicion de la cadena de urdimbre.
DE60313619T DE60313619T2 (de) 2003-11-10 2003-11-10 Verfahren zum Wiederanlaufen einer Webmaschine nach einem Stillstand und/oder einer Änderung der Position der Kette
EP03425726A EP1529862B1 (fr) 2003-11-10 2003-11-10 Procédé de redémarrage d'un métier à tisser après un arrêt et/ou un changement de position de la chaîne
AT03425726T ATE361385T1 (de) 2003-11-10 2003-11-10 Verfahren zum wiederanlaufen einer webmaschine nach einem stillstand und/oder einer änderung der position der kette

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03425726A EP1529862B1 (fr) 2003-11-10 2003-11-10 Procédé de redémarrage d'un métier à tisser après un arrêt et/ou un changement de position de la chaîne

Publications (2)

Publication Number Publication Date
EP1529862A1 EP1529862A1 (fr) 2005-05-11
EP1529862B1 true EP1529862B1 (fr) 2007-05-02

Family

ID=34429640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03425726A Expired - Lifetime EP1529862B1 (fr) 2003-11-10 2003-11-10 Procédé de redémarrage d'un métier à tisser après un arrêt et/ou un changement de position de la chaîne

Country Status (4)

Country Link
EP (1) EP1529862B1 (fr)
AT (1) ATE361385T1 (fr)
DE (1) DE60313619T2 (fr)
ES (1) ES2287442T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7968613B2 (en) 2007-08-03 2011-06-28 Cable Components Group Llc Compositions for compounding, extrusion and melt processing of foamable and cellular fluoropolymers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106937046B (zh) * 2017-03-07 2023-07-25 广东创达自动化装备有限公司 圆纬机布面实时图像的获取装置及方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE486590C (de) * 1929-11-21 Ver Seidenwebereien A G Vorrichtung fuer Webstuehle zum Beobachten der Schussanschlagstelle
SE448002B (sv) * 1983-10-07 1987-01-12 Asea Ab Optisk uppmetning samt overvakning av vevda produkter vid maskinvevstolar
CH668997A5 (en) * 1985-12-16 1989-02-15 Zellweger Uster Ag Re-start working parameter control - for weaving loom by warp tension sensor and microcomputer with memory
JPH0465555A (ja) * 1990-07-05 1992-03-02 Tsudakoma Corp 織機の織段防止装置
EP0682132B1 (fr) * 1994-05-09 1999-08-04 Sulzer RàœTi Ag Méthode et machine à tisser pour surveiller la position de la façure du tissu

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7968613B2 (en) 2007-08-03 2011-06-28 Cable Components Group Llc Compositions for compounding, extrusion and melt processing of foamable and cellular fluoropolymers

Also Published As

Publication number Publication date
DE60313619D1 (de) 2007-06-14
ATE361385T1 (de) 2007-05-15
ES2287442T3 (es) 2007-12-16
DE60313619T2 (de) 2008-01-31
EP1529862A1 (fr) 2005-05-11

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