EP0568470B1 - Locking and preselection device for heavy centre-shed dobbies - Google Patents
Locking and preselection device for heavy centre-shed dobbies Download PDFInfo
- Publication number
- EP0568470B1 EP0568470B1 EP93420166A EP93420166A EP0568470B1 EP 0568470 B1 EP0568470 B1 EP 0568470B1 EP 93420166 A EP93420166 A EP 93420166A EP 93420166 A EP93420166 A EP 93420166A EP 0568470 B1 EP0568470 B1 EP 0568470B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hook
- dobby
- lever
- oscillating lever
- oscillating
- 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
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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
- D03C1/10—Centre-shed dobbies, i.e. shed formed by lifting some threads and lowering the others from central shed-closed position
-
- 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
- D03C1/26—Facilitating engagement of lifting-hooks with draw-knives
Definitions
- the present invention relates to heavy dobbies used for training the crowd on very large weaving machines, of the kind in particular of those used for the manufacture of tubular fabrics suitable for the production of felts or dry endless 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 at 2 a on the fixed frame; one of the ends of each lever 2, provided with a crazy stop 2 b , is equipped with a double tilting hook 3 which is pivotally controlled by pushers (arrows 4) of the reading mechanism of the dobby in order to come selectively engaged with one or the other of two actuating knives 5 which are controlled to move alternately in unison in opposite directions.
- each oscillating lever comprise two movable locking members associated with elastic return means which tend to apply them laterally against the double tilting hook to immobilize the latter angularly when it has been grasped by a actuating knife, while ensuring its release at the time of the order or selection, that is to say when the two knives come simultaneously into contact with the considered oscillating lever.
- the elastic means associated with the movable locking members exert on each double tilting hook an angular retaining effect greater than the tilting effect applied to this hook by the pushers. of the reading mechanism, so that these pushers can begin to act on the hook before the oscillating lever in question has arrived at the selection position, thereby allowing the pre-selection of said hook.
- the reference 11 designates one of the oscillating levers which are pivotally mounted on a common axis 12 and which are coupled by a connecting rod 13 to the different heald frames of the corresponding weaving machine.
- each lever 11 carries a double hook 14 which is tiltably mounted on a small axis 15 and which is intended to receive the action of two pushers (arrow 16) of the reading mechanism of the dobby to engage one or the other of two actuating knives 17.
- These knives 17 are actuated so as to move alternately in opposite directions relative to each other. It has been assumed in the present case that these knives 17 move along a semi-circular profile having the common axis 12 as their center.
- each double hook 14 With each double hook 14 are associated two movable locking members constituted by two small friction pads 18 which pivot on studs 19 provided laterally on the lever 11 on either side of the axis 15 and which are connected one to the other by a leaf spring 20 with a loop-shaped profile, the ends of which are secured to said pads.
- This spring 20 tends to spread the actuating tails of the two pads 18 in order to apply their inner edge against the rounded lower part of the double hook 14, and it will be noted that at this working position, the aforementioned tails protrude laterally of the profile of the lower end of the oscillating levers 11.
- the oscillating lever 11 is consequently driven by this knife 17 and moves to the left, as illustrated in FIG. 3.
- the same effect obviously occurs when it is the opposite knife (right on the drawing) which has been selected, as shown in fig. 4.
- this spring 20 has been arranged so that it exerts on this locking pad 18 a greater angular retention force than that which is applied by one or other of the pushers 16 of the reading mechanism on the hook 14 with a view to selection, it is possible to ensure that the chosen pusher 16 begins to act on the hook 16 before the lever 11 has reached the vertical selection position according to FIG. 2; of course, this hook will not tilt until it has been released by the two pads 18, but such a structure allows the pre-selection of the hooks and levers; the reading mechanism consequently has a longer period of time for selection and in this way any risk of defect is avoided even at the high operating speeds now required for the dobby.
- the device according to the invention constituted by the pads 18 and the springs 20 therefore ensures in practice the positive locking of the hooks 14 (anti-rebound effect) and the pre-selection thereof.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Input From Keyboards Or The Like (AREA)
- Push-Button Switches (AREA)
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 large weaving machines, of the kind in particular of those used for the manufacture of tubular fabrics suitable for the production of felts or dry endless 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 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 an average 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 connues en pratique. 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 ; l'une des extrémités de chaque levier 2, pourvue d'une butée folle 2b, est équipée d'un crochet double basculant 3 qui est commandé au pivotement par des poussoirs (flèches 4) du mécanisme de lisage de la ratière afin de venir sélectivement en prise avec l'un ou l'autre de deux couteaux d'actionnement 5 qui 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 known in practice. Each of the heald frames CL mounted on the weaving machine is connected by a connecting rod 1 to a corresponding
L'actionnement de l'ensemble des crochets doubles 3 par le mécanisme de lisage s'effectue lorsque les deux couteaux 5 se trouvent en position centrale (leviers 2 orientés verticalement) et l'on comprend que suivant qu'un crochet vient coopérer avec l'un ou l'autre de ces couteaux 5, le cadre CL se déplace verticalement vers le haut ou vers le bas à partir de la position médiane correspondant à la fermeture du pas.The actuation of all of the
Si un tel système fonctionne de manière relativement correcte lorsque la vitesse de travail est réduite, il n'en va plus de même lorsque la ratière est associée à une machine à tisser entraînée aux cadences élevées maintenant exigées en pratique. En pareil cas, les crochets doubles sont soumis à des effets de rebond et de vibrations qui rendent aléatoire leur prise par les couteaux d'entraînement. Par ailleurs, les poussoirs 4 ne disposent que d'un très court laps de temps pour agir sur les crochets doubles et il arrive que ceux-ci basculent avec un très léger retard. Or, dans un cas comme dans l'autre, tout défaut de prise de l'un des crochets doubles 4 par le couteau 5 prévu se traduit par un défaut de tissage sur l'article en cours de réalisation.If such a system works relatively correctly when the working speed is reduced, the same does not apply when the dobby is associated with a weaving machine driven at the high rates now required in practice. In such cases, the double hooks are subject to rebound and vibration effects which make it difficult for them to be taken up by the drive knives. Furthermore, the
C'est à ces inconvénients qu'entend principalement remédier la présente invention, laquelle a pour objet la ratière lourde à pas fermé qui est définie à la revendication 1.It is these drawbacks that the present invention mainly 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 faire comporter à chaque levier oscillant deux organes mobiles de verrouillage associés à des moyens élastiques de rappel qui tendent à les appliquer latéralement contre le crochet double basculant pour immobiliser angulairement ce dernier lorsqu'il a été saisi par un couteau d'actionnement, tout en assurant sa libération au moment de la commande ou sélection, c'est-à-dire au moment où les deux couteaux viennent simultanément au contact du levier oscillant considéré.In fact, the invention essentially consists in making each oscillating lever comprise two movable locking members associated with elastic return means which tend to apply them laterally against the double tilting hook to immobilize the latter angularly when it has been grasped by a actuating knife, while ensuring its release at the time of the order or selection, that is to say when the two knives come simultaneously into contact with the considered oscillating lever.
Conformément à un mode de mise en oeuvre préféré de la disposition qui précède, les moyens élastiques associés aux organes mobiles de verrouillage exercent sur chaque crochet double basculant un effet de retenue angulaire plus important que l'effet de basculement appliqué à ce crochet par les poussoirs du mécanisme de lisage, afin que ces poussoirs puissent commencer à agir sur le crochet avant que le levier oscillant considéré soit arrivé à la position de sélection, en permettant de la sorte la pré-sélection dudit crochet.In accordance with a preferred embodiment of the above arrangement, the elastic means associated with the movable locking members exert on each double tilting hook an angular retaining effect greater than the tilting effect applied to this hook by the pushers. of the reading mechanism, so that these pushers can begin to act on the hook before the oscillating lever in question has arrived at the selection position, thereby allowing the pre-selection of said hook.
On observera que si le document US-A-1 759 530 (WELLS) montre bien une mécanique pour la formation de la foule telle que définie au préambule de la revendication 1 dans laquelle les crochets doubles basculants commandés par le mécanisme de lisage coopèrent, avec des plaques d'appui propres à agir sur des bossages desdits crochets en vue de maintenir ceux-ci en prise avec les couteaux d'actionnement, ces plaques sont fixes et agissent à la manière de rampes pour appliquer les crochets sur les couteaux. Le glissement des bossages contre ces plaques ou rampes provoque des échauffements et de l'usure, en même temps qu'il augmente sensiblement l'énergie à mettre en oeuvre ; en outre la présence des plaques d'appui ne permet pas d'adopter une structure compacte dans le cas de couteaux à forte section.It will be observed that if the document US-A-1 759 530 (WELLS) clearly shows a mechanism for the formation of the crowd as defined in the preamble of claim 1 in which the double tilting hooks controlled by the reading mechanism cooperate, with bearing plates capable of acting on bosses of said hooks in order to keep them in engagement with the actuating knives, these plates are fixed and act in the manner of ramps to apply the hooks to the knives. The sliding of the bosses against these plates or ramps causes overheating and wear, at the same time as it appreciably increases the energy to be used; in addition the presence of the support plates does not allow to adopt a compact structure in the case of knives with large section.
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.
- Fig. 2 montre de la même manière l'agencement d'une ratière suivant l'invention.
- Fig. 3 et 4 illustrent deux phases de fonctionnement de la ratière suivant fig. 2.
- As indicated above, fig. 1 schematically illustrates the general arrangement of a dobby with closed pitch of the conventional type.
- Fig. 2 similarly shows the arrangement of a dobby according to the invention.
- Fig. 3 and 4 illustrate two phases of operation of the dobby according to fig. 2.
En fig. 2 à 4, la référence 11 désigne l'un des leviers oscillants qui sont montés à pivotement sur un axe commun 12 et qui sont attelés par un embiellage 13 aux différents cadres de lisses de la machine à tisser correspondante. A l'opposé de l'embiellage 13, chaque levier 11 porte un crochet double 14 qui est monté à basculement sur un petit axe 15 et qui est destiné à recevoir l'action de deux poussoirs (flèche 16) du mécanisme de lisage de la ratière pour venir en prise avec l'un ou l'autre de deux couteaux d'actionnement 17.In fig. 2 to 4, the
Ces couteaux 17 sont actionnés de façon à se déplacer alternativement dans des directions opposées l'un par rapport à l'autre. On a supposé dans le présent cas que ces couteaux 17 se déplaçaient suivant un profil semi-circulaire ayant pour centre l'axe commun 12.These
A chaque crochet double 14 sont associés deux organes mobiles de verrouillage constitués par deux petits patins de friction 18 qui pivotent sur des goujons 19 prévus latéralement sur le levier 11 de part et d'autre de l'axe 15 et qui sont reliés l'un à l'autre par un ressort à lame 20 à profil en forme de boucle dont les extrémités sont arrimées auxdits patins. Ce ressort 20 tend à écarter les queues d'actionnement des deux patins 18 afin d'appliquer leur bord intérieur contre la partie inférieure arrondie du crochet double 14, et l'on notera qu'à cette position de travail, les queues précitées dépassent latéralement du profil de l'extrémité inférieure des leviers oscillants 11.With each
On conçoit dans ces conditions que lorsqu'un levier oscillant 11 se trouve à l'orientation verticale illustrée en fig. 2, avec les deux couteaux 17 appliqués contre l'extrémité inférieure de ce levier 11, les patins 18 sont repoussés vers le centre par lesdits couteaux et n'exercent de ce fait aucun effet de retenue sur le crochet 14 correspondant. Celui-ci est donc libre de basculer sous l'effet de l'un ou l'autre des deux poussoirs 16 afin de venir en prise avec le couteau 17 qui a été sélectionné par le mécanisme de lisage (couteau de gauche dans l'exemple envisagé en fig. 2).It is therefore conceivable that when an
Le levier oscillant 11 est en conséquence entraîné par ce couteau 17 et se déplace vers la gauche, à la manière illustrée en fig. 3. Le même effet se produit évidemment lorsque c'est le couteau opposé (à droite sur le dessin) qui a été sélectionné, comme montré en fig. 4.The oscillating
Il convient d'observer que dans un cas comme dans l'autre, le patin 18 tourné à l'opposé du couteau 17 qui assure la commande du levier oscillant 11 reçoit l'action du ressort à lame 20 qui l'applique contre le profil inférieur du crochet 14, lequel se trouve ainsi verrouillé angulairement au cours de tout le déplacement oscillant du levier 11 envisagé.It should be observed that in one case as in the other, the
Si l'on suppose maintenant qu'on a agencé ce ressort 20 de façon à ce qu'il exerce sur ce patin de verrouillage 18 un effort de retenue angulaire plus élevé que celui qui est appliqué par l'un ou l'autre des poussoirs 16 du mécanisme de lisage sur le crochet 14 en vue de la sélection, on peut faire en sorte que le poussoir 16 choisi commence à agir sur le crochet 16 avant que le levier 11 soit arrivé à la position verticale de sélection suivant fig. 2 ; bien entendu, ce crochet ne va basculer que lorsqu'il aura été libéré par les deux patins 18, mais une telle structure permet la pré-sélection des crochets et des leviers ; le mécanisme de lisage dispose en conséquence d'un laps de temps plus important pour la sélection et on évite de la sorte tout risque de défaut même aux grandes vitesses de fonctionnement maintenant exigées des ratières.If we now assume that this
Le dispositif suivant l'invention constitué par les patins 18 et les ressorts 20 assure donc bien en pratique le verrouillage positif des crochets 14 (effet anti-rebond) et la pré-sélection de ceux-ci.The device according to the invention constituted by the
Il va de soi qu'on peut imaginer d'autres formes de réalisation pour les organes mobiles 18 et les moyens élastiques de rappel 20.It goes without saying that other embodiments can be imagined for the
Claims (4)
- A heavy closed-shed dobby, of the type comprising two actuating blades (17) driven in an opposed alternating movement to cooperate selectively, under the action of pushers (16) of the reading-in mechanism of the dobby, with a rocking double hook (14) borne by each of the oscillating levers (11) connected to the heald frames (CL) of the corresponding loom, characterised in that each oscillating lever (11) has two mobile locking members (18) in the form of shoes which, under the action of elastic return means (20), are applied laterally against the corresponding rocking double hook (14), which is thus immobilised angularly when it has been gripped by the blade (17) with which it cooperates, which locking members (18) are actuated for liberation each by a different blade (17) when these blades (17) come simultaneously into contact with the oscillating lever (11) in question at the moment of selection.
- A dobby according to Claim 1, characterised in that the elastic return means (20) exert on each rocking double hook (14) an angular retaining force which is greater than the rocking force applied to this hook by the pushers (16) of the reading-in mechanism, so that these latter can start to act on the hook before the oscillating lever (11) has arrived in the selection position, thus permitting the preselection of said hook.
- A dobby according to any one of Claims 1 and 2, characterised in that the locking members or shoes (18) are mounted to pivot on pins (19) which are integral with the corresponding oscillating lever (11) and comprise an actuating rod provided to project with respect to the lateral profile of said lever so as to be hit laterally by the actuating blades (17).
- A dobby according to Claim 3, characterised in that the elastic return means are formed by a spring leaf (20) in the form of a loop, the ends of which are made integral with the two mobile members or shoes (18).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9205481A FR2690465A1 (en) | 1992-04-28 | 1992-04-28 | Locking and preselection device for heavy dobbies of the firm pitch type. |
| FR9205481 | 1992-04-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0568470A1 EP0568470A1 (en) | 1993-11-03 |
| EP0568470B1 true EP0568470B1 (en) | 1995-02-15 |
Family
ID=9429512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93420166A Expired - Lifetime EP0568470B1 (en) | 1992-04-28 | 1993-04-21 | Locking and preselection device for heavy centre-shed dobbies |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5316049A (en) |
| EP (1) | EP0568470B1 (en) |
| JP (1) | JP3264033B2 (en) |
| CZ (1) | CZ75193A3 (en) |
| DE (1) | DE69300061T2 (en) |
| FR (1) | FR2690465A1 (en) |
Families Citing this family (3)
| 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 |
| 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 |
| EP1315640A1 (en) * | 2000-09-08 | 2003-06-04 | Magna Interior Systems Inc. | Cargo management system useful as a table |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE143983C (en) * | ||||
| DE106666C (en) * | ||||
| DE130027C (en) * | ||||
| US1759530A (en) * | 1928-08-30 | 1930-05-20 | Wonder Weave Inc | Loom shedding mechanism |
| DE915800C (en) * | 1952-07-31 | 1954-07-29 | Brock Soehne Maschinenfabrik W | Closed student shank machine |
| DE3119476A1 (en) * | 1981-05-15 | 1983-02-03 | Centralen Savet na Naučno-techničeskite Sajuzi, Sofija | Electromagnetic coupling mechanism of a dobby |
| FR2647124B1 (en) * | 1989-05-19 | 1991-07-12 | Staubli Sa Ets | NEGATIVE RATIERE WITH OSCILLATING SCALES FOR WEAVING |
| FR2663347A1 (en) * | 1990-06-15 | 1991-12-20 | Staubli Trumpelt Gmbh Maschine | CLOSED CROWD RAIL FOR WEAVING MATERIALS. |
-
1992
- 1992-04-28 FR FR9205481A patent/FR2690465A1/en active Granted
-
1993
- 1993-04-07 US US08/043,749 patent/US5316049A/en not_active Expired - Fee Related
- 1993-04-15 JP JP08883593A patent/JP3264033B2/en not_active Expired - Fee Related
- 1993-04-21 DE DE69300061T patent/DE69300061T2/en not_active Expired - Fee Related
- 1993-04-21 EP EP93420166A patent/EP0568470B1/en not_active Expired - Lifetime
- 1993-04-27 CZ CZ93751A patent/CZ75193A3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2690465B1 (en) | 1994-07-13 |
| FR2690465A1 (en) | 1993-10-29 |
| EP0568470A1 (en) | 1993-11-03 |
| JP3264033B2 (en) | 2002-03-11 |
| JPH0617344A (en) | 1994-01-25 |
| CZ75193A3 (en) | 1993-11-17 |
| DE69300061D1 (en) | 1995-03-23 |
| US5316049A (en) | 1994-05-31 |
| DE69300061T2 (en) | 1995-08-24 |
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