EP0566506A1 - Device for reciprocating the knives in heavy centre-shed dobbies - Google Patents

Device for reciprocating the knives in heavy centre-shed dobbies Download PDF

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Publication number
EP0566506A1
EP0566506A1 EP93420156A EP93420156A EP0566506A1 EP 0566506 A1 EP0566506 A1 EP 0566506A1 EP 93420156 A EP93420156 A EP 93420156A EP 93420156 A EP93420156 A EP 93420156A EP 0566506 A1 EP0566506 A1 EP 0566506A1
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EP
European Patent Office
Prior art keywords
knives
dobby
drums
heavy
movement
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
EP93420156A
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German (de)
French (fr)
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EP0566506B1 (en
Inventor
Siegmund Horst Tremer
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Staeubli GmbH
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Staeubli und Trumpelt GmbH Maschinenfabrik
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Application filed by Staeubli und Trumpelt GmbH Maschinenfabrik filed Critical Staeubli und Trumpelt GmbH Maschinenfabrik
Publication of EP0566506A1 publication Critical patent/EP0566506A1/en
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Publication of EP0566506B1 publication Critical patent/EP0566506B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/14—Features common to dobbies of different types
    • D03C1/18—Knives; Knife frames
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/10—Centre-shed dobbies, i.e. shed formed by lifting some threads and lowering the others from central shed-closed position

Definitions

  • the present invention relates to heavy dobbies used for training the crowd on very wide weaving machines, of the kind in particular of those used for the manufacture of tubular fabrics suitable for the production of felts or endless dry filters for pulp industry.
  • each of the heald frames CL mounted on the weaving machine is connected by a connecting rod 1 to a corresponding oscillating lever 2, articulated in 2a on the fixed frame; opposite this point 2a, each lever 2, provided with a stop 2b, supports a double tilting hook 3 which is pivotally controlled by pushers of the dobby reading mechanism in order to selectively engage the one or the other of two actuating knives 4, which, suitably guided horizontally, are controlled to move alternately in unison in opposite directions.
  • the mechanism for the alternative control of the two knives 4 comprises, at each of the opposite ends thereof, a link 5 articulated on the one hand to one of said knives, on the other hand to a beam 6 capable of oscillating around d 'a support axis 7.
  • Each of the two flails 6 is equipped with two rollers 6a and 6b which roll on the tracks 8a and 8b of a complementary cam 8 wedged on a shaft 8c, driven in continuous rotation, through a schematic transmission at 9, by the motor of the corresponding weaving machine.
  • the invention essentially consists in providing, on either side of the actuating knives, two drums rotating in synchronism, which are oriented parallel to the direction of alternating movement of said knives and the periphery of which is hollowed out by two grooves with corrugated profiles. reversed which cooperate with the ends of each of the knives, so that the rotation of these drums ensures desmodromically the alternating movement of said knives in opposite directions.
  • Fig. 2 is a perspective view illustrating the arrangement of a dobby established in accordance with the present invention.
  • Fig. 3 is a detail section illustrating the cooperation of the drums and the ends of the knives.
  • the reference 11 designates the two reciprocating knives which, in the conventional manner, are intended to cooperate selectively with the double tilting hook 13 pivotally mounted at the upper end of each of the oscillating levers 14 connected by a connecting rod 15 to the matching heald frame. It is on these hooks 13 that the pushers (not shown) of the usual dobby binding mechanism act, in the manner which has been described above.
  • the invention uses two drums 16 carried by shafts 17 oriented transversely to the axis of said knives, that is to say parallel to the direction of movement to be imparted to these last.
  • the two shafts 17 are connected to each other by a toothed belt 18 associated with two corresponding pulleys 19 and one of these shafts extends axially at 17 'to be kinematically linked to the shaft (not shown) of the weaving machine controlled by the envisaged dobby, or that of an independent motor.
  • Each drum 16 is hollowed out by two grooves 16a inside each of which is engaged a roller 12 (fig. 3) mounted idly on a stud 11a, provided axially at each of the ends of the knives 11. It is easily understood that by means of a appropriate corrugated profile of the grooves 16a and a suitable offset of the latter, the rotation of the drums 16 will impart to the knives 11, introduced between horizontal guides shown diagrammatically at 20, the alternative movement sought.
  • each knife takes place gradually, without sudden jerk. Furthermore and above all, the knives 11 are directly connected to the profile of the grooves 16a of the drums 16, without any intermediate articulation; the movement is thus likely to be of perfect quality, absolutely unchanging in time.
  • the dobby according to the invention can thus operate at very high working speeds, without parasitic vibrations and without risks of weaving defect. It will also be observed that its structure is more compact and more economical than traditional structures.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)

Abstract

Heavy closed-shed dobby of the type comprising two actuating knives (11) driven in an opposed alternating movement for cooperating selectively with a double tilting hook (13) carried by each of the pivoting levers (14) coupled to the heald frames (CL) of the corresponding weaving machine, characterised in that it comprises two rotating drums (16) which are oriented parallel to the direction of movement of the knives (11) and the periphery of which has two grooves (16a) which have reversed undulated profiles and inside which are engaged studs (11a) provided axially at the end of each knife. <IMAGE>

Description

La présente invention a trait aux ratières lourdes utilisées pour la formation de la foule sur les machines à tisser de très grande largeur, du genre notamment de celles employées pour la fabrication de tissus tubulaires aptes à la réalisation de feutres ou filtres secs sans fin pour l'industrie de la pâte à papier.The present invention relates to heavy dobbies used for training the crowd on very wide weaving machines, of the kind in particular of those used for the manufacture of tubular fabrics suitable for the production of felts or endless dry filters for pulp industry.

Par suite de la très grande amplitude de la course des cadres de lisses associés à ces ratières, on ne peut utiliser les systèmes classiques à foule ouverte et l'on doit avoir recours à des ratières à pas fermé, c'est-à-dire dans lesquelles chaque cadre se déplace vers le bas ou vers le haut à partir d'une position moyenne correspondant au point de croisement de l'ensemble des cadres.Due to the very large amplitude of the heald frame travel associated with these dobbies, conventional open crowd systems cannot be used and dobbies with closed steps must be used, that is to say in which each frame moves down or up from a middle position corresponding to the cross point of all the frames.

A la fig. 1 du dessin annexé aux présentes, on a très schématiquement rappelé l'agencement général des ratières lourdes à pas fermé de type classique. Chacun des cadres de lisses CL montés sur la machine à tisser est relié par un embiellage 1 à un levier oscillant 2 correspondant, articulé en 2a sur le bâti fixe; à l'opposé de ce point 2a, chaque levier 2, pourvu d'une butée 2b, supporte un crochet double basculant 3 qui est commandé au pivotement par des poussoirs du mécanisme de lecture de la ratière afin de venir sélectivement en prise avec l'un ou l'autre de deux couteaux d'actionnement 4, lesquels, convenablement guidés horizontalement, sont commandés pour se déplacer alternativement à l'unisson dans des directions opposées.In fig. 1 of the drawing appended hereto, we have very schematically recalled the general arrangement of heavy dobbies with closed pitch of the conventional type. Each of the heald frames CL mounted on the weaving machine is connected by a connecting rod 1 to a corresponding oscillating lever 2, articulated in 2a on the fixed frame; opposite this point 2a, each lever 2, provided with a stop 2b, supports a double tilting hook 3 which is pivotally controlled by pushers of the dobby reading mechanism in order to selectively engage the one or the other of two actuating knives 4, which, suitably guided horizontally, are controlled to move alternately in unison in opposite directions.

L'actionnement de l'ensemble des crochets doubles 3 par le mécanisme de lecture s'effectue lorsque les deux couteaux 4 se trouvent en position centrale (leviers 2 orientés verticalement) et l'on comprend que suivant qu'un crochet vient coopèrer avec l'un ou l'autre des couteaux 4, le cadre CL correspondant se déplace verticalement vers le haut ou vers le bas à partir de la position correspondant à la fermeture du pas.The actuation of all of the double hooks 3 by the reading mechanism takes place when the two knives 4 are in the central position (levers 2 oriented vertically) and it is understood that, depending on whether a hook comes to cooperate with the 'either of the knives 4, the corresponding CL frame moves vertically up or down from the position corresponding to the closing of the pitch.

Le mécanisme pour la commande alternative des deux couteaux 4 comprend, à chacune des extrémités opposées de ceux-ci, une biellette 5 articulée d'une part à l'un desdits couteaux, d'autre part à un fléau 6 propre à osciller autour d'un axe-support 7. Chacun des deux fléaux 6 est équipé de deux galets 6a et 6b qui roulent sur les pistes 8a et 8b d'une came complémentaire 8 calée sur un arbre 8c, entraîné en rotation continue, à travers une transmission schématisée en 9, par le moteur de la machine à tissercorres- pondante.The mechanism for the alternative control of the two knives 4 comprises, at each of the opposite ends thereof, a link 5 articulated on the one hand to one of said knives, on the other hand to a beam 6 capable of oscillating around d 'a support axis 7. Each of the two flails 6 is equipped with two rollers 6a and 6b which roll on the tracks 8a and 8b of a complementary cam 8 wedged on a shaft 8c, driven in continuous rotation, through a schematic transmission at 9, by the motor of the corresponding weaving machine.

On comprend que si un tel mécanisme permet bien de conférer aux deux couteaux 4 le mouvement alternatif recherché, son fonctionnement aux vitesses élevées maintenant imposées aux machines à tisser devient très aléatoire, du fait notamment de la longueur de la chaîne cinématique, laquelle comprend un nombre important d'articulations susceptibles de prendre du jeu. Les défauts de tissage sont donc relativement fréquents.We understand that if such a mechanism allows to give the two knives 4 the desired alternative movement, its operation at high speeds now imposed on weaving machines becomes very random, due in particular to the length of the kinematic chain, which includes a number important joints likely to take play. Weaving defects are therefore relatively frequent.

C'est à cet inconvénient qu'entend remédier la présente invention, laquelle a pour objet la ratière lourde à pas fermé qui est définie à la revendication 1.It is to this drawback that the present invention intends to remedy, which relates to the heavy dobby with closed pitch which is defined in claim 1.

En fait l'invention consiste essentiellement à prévoir de part et d'autre des couteaux d'actionnement deux tambours tournant en synchronisme, qui sont orientés parallèlement à la direction de déplacement alternatif desdits couteaux et dont la périphérie est creusée de deux rainures à profils ondulés inversés qui coopèrent avec les extrémités de chacun des couteaux, de sorte que la rotation de ces tambours assure desmodromiquement le déplacement alternatif desdits couteaux dans des directions opposées.In fact, the invention essentially consists in providing, on either side of the actuating knives, two drums rotating in synchronism, which are oriented parallel to the direction of alternating movement of said knives and the periphery of which is hollowed out by two grooves with corrugated profiles. reversed which cooperate with the ends of each of the knives, so that the rotation of these drums ensures desmodromically the alternating movement of said knives in opposite directions.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :

  • Comme indiqué plus haut, fig. 1 illustre schématiquement l'agencement général d'une ratière à pas fermé de type classique.
The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
  • As indicated above, fig. 1 schematically illustrates the general arrangement of a dobby with closed pitch of the conventional type.

Fig. 2 est une vue en perspective illustrant l'agencement d'une ratière établie conformément à la présente invention.Fig. 2 is a perspective view illustrating the arrangement of a dobby established in accordance with the present invention.

Fig. 3 est une coupe de détail illustrant la coopération des tambours et des extrémités des couteaux.Fig. 3 is a detail section illustrating the cooperation of the drums and the ends of the knives.

En fig. 2, la référence 11 désigne les deux couteaux à mouvement alternatif qui, à la façon classique, sont destinés à coopèrer sélectivement avec le crochet double basculant 13 monté à pivotement à l'extrémité supérieure de chacun des leviers oscillants 14 reliés par un embiellage 15 au cadre de lisses correspondant. C'est sur ces crochets 13 qu'agissent les poussoirs (non représentés) du mécanisme de li- sage usuel de la ratière, à la manière qui a été décrite plus haut.In fig. 2, the reference 11 designates the two reciprocating knives which, in the conventional manner, are intended to cooperate selectively with the double tilting hook 13 pivotally mounted at the upper end of each of the oscillating levers 14 connected by a connecting rod 15 to the matching heald frame. It is on these hooks 13 that the pushers (not shown) of the usual dobby binding mechanism act, in the manner which has been described above.

Pour assurer la commande alternative des deux couteaux 11, l'invention a recours à deux tambours 16 portés par des arbres 17 orientés transversalement à l'axe desdits couteaux, c'est-à-dire parallèlement à la direction du mouvement à impartir à ces derniers. Les deux arbres 17 sont reliés l'un à l'autre par une courroie crantée 18 associée à deux poulies correspondantes 19 et l'un de ces arbres se prolonge axialement en 17' pour être lié cinématiquement à l'arbre (non représenté) de la machine à tisser commandée par la ratière envisagée, ou à celui d'un moteur indépendant.To provide alternative control of the two knives 11, the invention uses two drums 16 carried by shafts 17 oriented transversely to the axis of said knives, that is to say parallel to the direction of movement to be imparted to these last. The two shafts 17 are connected to each other by a toothed belt 18 associated with two corresponding pulleys 19 and one of these shafts extends axially at 17 'to be kinematically linked to the shaft (not shown) of the weaving machine controlled by the envisaged dobby, or that of an independent motor.

Chaque tambour 16 est creusé de deux rainures 16a à l'intérieur de chacune desquelles est engagé un galet 12 (fig. 3) monté fou sur un goujon 11a, prévu axialement à chacune des extrémités des couteaux 11. On conçoit sans peine que moyennant un profil ondulé approprié des rainures 16a et un décalage convenable de ces dernières, la rotation des tambours 16 va impartir aux couteaux 11, introduits entre des guides horizontaux schématisés en 20, le mouvement alternatif recherché.Each drum 16 is hollowed out by two grooves 16a inside each of which is engaged a roller 12 (fig. 3) mounted idly on a stud 11a, provided axially at each of the ends of the knives 11. It is easily understood that by means of a appropriate corrugated profile of the grooves 16a and a suitable offset of the latter, the rotation of the drums 16 will impart to the knives 11, introduced between horizontal guides shown diagrammatically at 20, the alternative movement sought.

L'inversion du mouvement de chaque couteau s'effectue de manière progressive, sans à-coup brusque. Par ailleurs et surtout, les couteaux 11 sont directement reliés au profil des rainures 16a des tambours 16, sans aucune articulation intermédiaire ; le mouvement est ainsi susceptible d'être d'une qualité parfaite, absolument invariable dans le temps. La ratière suivant l'invention peut ainsi fonctionner à des vitesses de travail très élevées, sans vibrations parasites et sans risques de défaut de tissage. On observera en outre que sa structure est plus compacte et plus économique que les structures traditionnelles.The inversion of the movement of each knife takes place gradually, without sudden jerk. Furthermore and above all, the knives 11 are directly connected to the profile of the grooves 16a of the drums 16, without any intermediate articulation; the movement is thus likely to be of perfect quality, absolutely unchanging in time. The dobby according to the invention can thus operate at very high working speeds, without parasitic vibrations and without risks of weaving defect. It will also be observed that its structure is more compact and more economical than traditional structures.

Il va de soi que la transmission 18-19 par courroie et poulies crantées est susceptible d'être remplacée par tout autre système (chaîne, engrenages, etc...) apte à assurer un entraînement rigoureusement synchrone des deux tambours 16.It goes without saying that the transmission 18-19 by belt and toothed pulleys is capable of being replaced by any other system (chain, gears, etc.) capable of ensuring a strictly synchronous drive of the two drums 16.

Claims (2)

1. Ratière lourde à pas fermé, du genre comprenant deux couteaux d'actionnement (11) animés d'un déplacement alternatif opposé pour coopérer sélectivement avec un crochet double basculant (13) porté par chacun des leviers pivotants (14) attelés aux cadres de lisses (CL) de la machine à tisser correspondante, caractérisée en ce qu'elle comprend deux tambours (16) tournant en synchronisme, qui sont orientés de manière substantiellement parallèle à la trajectoire des couteaux (11) et dont la périphérie est creusée de deux rainures (16a) à profils ondulés inversés, à l'intérieur desquelles sont engagés des goujons (11a) prévus axialement en bout de chaque couteau.1. Heavy dobby with closed pitch, of the kind comprising two actuating knives (11) animated by an opposite reciprocating movement to cooperate selectively with a double tilting hook (13) carried by each of the pivoting levers (14) coupled to the frames of healds (CL) of the corresponding weaving machine, characterized in that it comprises two drums (16) rotating in synchronism, which are oriented substantially parallel to the path of the knives (11) and whose periphery is hollowed out by two grooves (16a) with inverted wavy profiles, inside which are engaged studs (11a) provided axially at the end of each knife. 2. Ratière suivant la revendication 1, caractérisée en ce que l'entrainement des deux tambours (16) en synchronisme est assuré à l'aide d'une transmission par courroie et poulies crantées (18-19), par chaîne ou par engrenages.2. Dobby according to claim 1, characterized in that the drive of the two drums (16) in synchronism is ensured by means of a transmission by belt and toothed pulleys (18-19), by chain or by gears.
EP93420156A 1992-04-14 1993-04-13 Device for reciprocating the knives in heavy centre-shed dobbies Expired - Lifetime EP0566506B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9204880 1992-04-14
FR9204880A FR2689913A1 (en) 1992-04-14 1992-04-14 Mechanism for the alternative control of knives in heavy dobbies of the closed pitch type.

Publications (2)

Publication Number Publication Date
EP0566506A1 true EP0566506A1 (en) 1993-10-20
EP0566506B1 EP0566506B1 (en) 1996-12-27

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EP93420156A Expired - Lifetime EP0566506B1 (en) 1992-04-14 1993-04-13 Device for reciprocating the knives in heavy centre-shed dobbies

Country Status (6)

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US (1) US5309949A (en)
EP (1) EP0566506B1 (en)
JP (1) JP3264032B2 (en)
CZ (1) CZ61193A3 (en)
DE (1) DE69306848T2 (en)
FR (1) FR2689913A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0699786A2 (en) 1994-09-01 1996-03-06 Stäubli GmbH Shedding device
EP1516947A2 (en) † 2003-09-17 2005-03-23 Groz-Beckert KG Shaft drive for weaving machines

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804041B4 (en) * 1997-02-06 2005-10-06 Texo Ab Dobby for controlling the movements of the shaft frame of a weaving machine
SE508238C2 (en) * 1997-02-06 1998-09-14 Texo Ab Shaft machine for controlling weaving machine movements in weaving machine
DE19861000B4 (en) * 1997-02-06 2006-11-02 Texo Ab Dobby assembly - has a number of pedals at a pedal spindle with a common drive through a single cam drum
US7600282B2 (en) 2003-02-10 2009-10-13 Niclas Grunewald Drive protection device
US20070284422A1 (en) * 2006-06-09 2007-12-13 Nottingham Spirk Design Associates, Inc. Reconfigurable storage box and cutter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE32559C (en) * ch. J. kane und R. E. lester in New-York Harnesses for mechanical looms
DE39816C (en) * J. A. S. BlER-NATZKI in Hamburg und R. E. LESTER in New-York Loom harness
DE915800C (en) * 1952-07-31 1954-07-29 Brock Soehne Maschinenfabrik W Closed student shank machine
CH653385A5 (en) * 1981-05-15 1985-12-31 Setafin Sa Heald-frame drive on a circular weaving machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB592892A (en) * 1944-12-18 1947-10-02 Peter Walker Blackburn Ltd Improvements relating to loom jacquards
CH402759A (en) * 1962-12-15 1965-11-15 Brevitex Ets Exploit Dobby especially suitable for fast looms
AT262171B (en) * 1965-04-06 1968-06-10 Elitex Zavody Textilniho High-speed double-stroke shaft machine with counter-rotating blanks
BE1001921A3 (en) * 1988-12-27 1990-04-10 Picanol Nv An apparatus for driving harnesses in weaving machines.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE32559C (en) * ch. J. kane und R. E. lester in New-York Harnesses for mechanical looms
DE39816C (en) * J. A. S. BlER-NATZKI in Hamburg und R. E. LESTER in New-York Loom harness
DE915800C (en) * 1952-07-31 1954-07-29 Brock Soehne Maschinenfabrik W Closed student shank machine
CH653385A5 (en) * 1981-05-15 1985-12-31 Setafin Sa Heald-frame drive on a circular weaving machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0699786A2 (en) 1994-09-01 1996-03-06 Stäubli GmbH Shedding device
EP0699786A3 (en) * 1994-09-01 1997-09-03 Staeubli Gmbh Shedding device
EP1516947A2 (en) † 2003-09-17 2005-03-23 Groz-Beckert KG Shaft drive for weaving machines
EP1516947B2 (en) † 2003-09-17 2012-08-29 Groz-Beckert KG Shaft drive for weaving machines

Also Published As

Publication number Publication date
EP0566506B1 (en) 1996-12-27
JP3264032B2 (en) 2002-03-11
CZ61193A3 (en) 1993-11-17
JPH0617342A (en) 1994-01-25
DE69306848T2 (en) 1997-05-07
FR2689913A1 (en) 1993-10-15
US5309949A (en) 1994-05-10
FR2689913B1 (en) 1994-07-13
DE69306848D1 (en) 1997-02-06

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