EP1069218B1 - Jacquard shedding mechanism and weaving loom with such a mechanism - Google Patents

Description

The invention relates to machines used for crowd training on looms. It relates to, more particularly, the Jacquard type armor mechanics. The invention also relates to a loom equipped with such a mechanical.

In their classic construction, the Jacquard mechanics include a head actuator located above of the trade, and a harness connecting this head to the wires of chain stretched on this job. This harness itself includes a series of arcades directly and individually controlled by the head in a vertical movement. Each of arches is assembled by a collar with one or more beams, each stringer carrying an eyelet crossed by a chain wire.

Known devices most often include claw frames carrying claws or knives intended for whether or not to raise hooks kinematically linked to the arches. The fact of dragging these claw frames with a movement vertical reciprocating requires the use of a transmission mechanics developed, from the central tree of the trade, while the precision of the crowd obtained depends on the games mechanics of this kinematic assembly. The devices known mechanics are complex and inaccessible, which disrupts their assembly and maintenance.

Furthermore, FR 2 680 526 A discloses an equipped weaving loom of actuators using Laplace forces. This job is a significant bulk.

The invention aims to overcome the above limitations by offering armor mechanics and a loom compact, economical and easily accessible, so that their implementation is facilitated.

In this spirit, the invention relates to a mechanical of Jacquard type armor for crowd training on a loom, this mechanism being associated with a harness comprising arches, integral with beams associated with the wires of the trade chain, the arches being controlled by electric actuators, characterized in that said actuators are ordered in rows and / or in columns forming two panels arranged above the profession and in that a power supply and control unit these actuators is housed in a compartment defined between these panels.

Thanks to the invention, it is possible to make cohabit the panels formed by these actuators and the power unit and control of these actuators in a compact package economical and easily accessible for operations assembly and maintenance of the loom. The compartment thus formed effectively protects the power unit and control of its environment, especially shocks mechanical and dust or surrounding fluff.

• Deux platines disposées aux extrémités des panneaux bordent le compartiment, l'une de ces platines supportant des moyens de contrôle en température de ce compartiment et/ou des actionneurs. Dans ce cas, les moyens de contrôle en température comprennent avantageusement une unité de ventilation apte à diriger vers l'unité d'alimentation et/ou de contrôle et/ou vers les actionneurs un courant d'air de refroidissement. Grâce à cet aspect de l'invention, l'unité de contrôle et les actionneurs peuvent être refroidis avec un même dispositif, ce qui est avantageux sur le plan de la fiabilité et du prix de revient de la mécanique de l'invention. On peut également prévoir que des panneaux forment ou portent des canaux de circulation d'air de ventilation des actionneurs, ces panneaux s'étendant globalement entre les platines à partir de l'unité de ventilation.
• La mécanique comprend une chambre de mise en surpression de l'air de refroidissement par l'unité de ventilation, cette chambre étant en communication, avec le compartiment et/ou des canaux formés ou portés par les panneaux, à travers des orifices ménagés dans la platine. Dans ce cas, la platine opposée est avantageusement pourvue d'orifices d'échappement de l'air de refroidissement en provenance du compartiment ou des canaux.
• Les panneaux sont inclinés l'un par rapport à l'autre, leur écartement allant croissant vers le haut, une ouverture d'accès au compartiment étant prévue au niveau des bords supérieurs de ces panneaux. Dans ce cas, un capot amovible de fermeture de cette ouverture est avantageusement prévu. On peut également intégrer à la structure du métier une coursive d'accès à cette ouverture.
• Les panneaux sont formés de boítiers de réception des actionneurs, ces boítiers étant assemblés les uns aux autres selon des rangées et/ou des colonnes.

According to advantageous but not compulsory aspects of the invention, the mechanics incorporates one or more of the following characteristics:

• Two plates arranged at the ends of the panels border the compartment, one of these plates supporting means for controlling the temperature of this compartment and / or the actuators. In this case, the temperature control means advantageously comprise a ventilation unit capable of directing towards the supply and / or control unit and / or towards the actuators a stream of cooling air. Thanks to this aspect of the invention, the control unit and the actuators can be cooled with the same device, which is advantageous in terms of reliability and cost price of the mechanics of the invention. It is also possible to provide for panels to form or carry channels for circulating the ventilation air of the actuators, these panels extending generally between the plates from the ventilation unit.
• The mechanics comprises a chamber for boosting the cooling air by the ventilation unit, this chamber being in communication with the compartment and / or channels formed or carried by the panels, through orifices provided in the platinum. In this case, the opposite plate is advantageously provided with outlets for cooling air from the compartment or the channels.
• The panels are inclined relative to each other, their spacing increasing upward, an access opening to the compartment being provided at the upper edges of these panels. In this case, a removable cover for closing this opening is advantageously provided. One can also integrate into the structure of the trade a passageway to access this opening.
• The panels are formed from actuator receiving boxes, these boxes being assembled to each other in rows and / or columns.

The invention also relates to a weaving loom equipped armor mechanics as previously described. This weaving loom is easier to implement and maintain that the trades of the prior art. Its performance is significantly improved compared to the known technique and it allows wire-to-wire or group control of several son of a Jacquard harness.

• la figure 1 est une coupe verticale schématique d'un métier à tisser conforme à l'invention ;
• la figure 2 est une coupe partielle à plus grande échelle selon la ligne II-II à la figure 1, on y a indiqué en I-I le plan de coupe de la figure 1 ;
• la figure 3 est une coupe partielle à plus grande échelle selon la ligne III-III à la figure 1 et
• la figure 4 est une vue de détail d'un boítier visible à la figure 1.

The invention will be better understood and other advantages of it will appear more clearly in the light of the following description of an embodiment of a weave mechanism and a loom in accordance with its principle, given only by way of example and made with reference to the appended drawings in which:

• Figure 1 is a schematic vertical section of a weaving loom according to the invention;
• Figure 2 is a partial section on a larger scale along the line II-II in Figure 1, there is indicated in II the section plane of Figure 1;
• FIG. 3 is a partial section on a larger scale along the line III-III in FIG. 1 and
• Figure 4 is a detail view of a housing visible in Figure 1.

The mechanics schematically represented in FIGS. 1 to 4 is formed by the mutual assembly of a multitude of housings 1 each of which contains several rotary actuators 2, the output shaft of which carries a pulley 3 for winding a yoke 4 connected to a rail 5 intended to control the wires of chain 6 of the loom. Each stringer is connected to the frame of the loom by an elastic return system 7.

The different boxes 1 are assembled in rows perpendicular to the plane of Figure 1 and in parallel columns to this plane, so that they form two panels A and B arranged above the weaving area, that is to say above of the trade itself. Panels A and B form a V-shaped structure open upwards and carry plates 8 of guiding the arches 4 so as to avoid interference between these arches, while a drip board 9 is provided above beams 5.

A frame 10 supports the panels A and B above of the trade in the above configuration. This frame includes a passageway 11 accessible by a staircase 12.

Between panels A and B is defined a space whose section in the plane of Figure 1 is generally triangular and inside which is housed a power supply unit 20 actuator control 2.

The unit 20 includes, among others, a transformer, a rectifier-regulator block for power supply and for supplying one or more electronic cards actuator control 2. Unit 20 also includes a battery and a back-up battery, as well as a switching between the different possible sources of voltage. The unit 20 is connected by layers of conductive wires or conductive rods to the actuators 2 of each of the panels A and B. In practice, the conductive layers or rods are connected to electronic control cards 2 'associated with motors 2 in each of the housings 1, such a card being shown only in Figure 4.

A cover 21 covers the unit 20 and the panels A and B.

Thus, the aforementioned space forms a compartment 22 of reception and protection of the unit 20.

The cover 21 is advantageously mounted in leaktight manner on the panels A and B, in order to close the upper opening 22 a of the compartment 22, which allows it to effectively protect the unit 20 from the wads of the ambient atmosphere.

Two plates 23 and 24 are provided at the ends of the compartment 22 and extend in planes overall perpendicular to panels A and B.

Unit 20 is supported in compartment 22 thanks to two brackets 25 respectively fixed on the plates 23 and 24.

The plate 23 also supports, thanks to a bracket 26, a ventilation unit 27 arranged inside a chamber 28 formed by a cover 29 mounted on the plate 23 and provided with an air inlet orifice 29 is equipped with a filter 30. the unit 27 to create an overpressure in the chamber 28, this pressure being distributed toward the inside of compartment 22 as an air flow shown by the arrows F in figures 2 and 3. This air flow has the effect of cooling the unit 20 which tends to heat up due to the current consumption. To do this, several ports 23a are provided in the plate 23 for the passage of cooling air, so that corresponding holes 24 a are provided on the plate 24 for the escape of cooling air.

Channels 31 for cooling the actuators 2 are also provided in the panels A and B behind the actuators 2, these channels 31 being in communication with the chamber 28 by means of specific orifices 23 b aligned with exhaust orifices 24 b provided in plate 24.

Due to the flow F of air from the chamber 28, overpressure is created in compartment 22 and in channels 31, which prevents the accumulation of fluff in these volumes. To improve heat transfer, channels 31 can be provided with internal cooling fins boxes 1.

The access to the unit 20 is done by removing the cover 21 from the opening 22 a which it seals at the upper edges of the panels A and B. An operator who stands on the passageway 11 can then easily proceed to mounting operations, control or maintenance of the constituent elements of the unit 20 by working in a satisfactory position in terms of ergonomics and with very good accessibility to these elements. The passageway 11 also provides access to the actuators 2 and / or to the arches 4 for their assembly and maintenance.

The invention therefore makes it possible to increase the reliability of operator intervention and to save time when assembly and maintenance of a conforming loom to its principle. In fact, almost all of the cables and electrical connections can be made in the workshop and tested before shipping to the job site, then that the assembly obtained is compact, robust and economical.

Claims (10)

1. A dobby mechanism of Jacquard type for forming the shed on a loom, said mechanism being associated with a harness comprising harness cords (4) joined to healds (5) which are associated with the warp threads (6) of said loom, said harness cords being controlled by electric actuators (2), characterised in that said actuators are arranged in rows and/or in columns forming two panels (A, B) arranged above the loom and in that a unit (20) for supplying and controlling said actuators is housed in a compartment (22) defined between said panels.
2. A mechanism according to Claim 1, characterised in that it comprises two plates (23, 24) arranged at the ends of said panels (A, B) and bordering said compartment (22), one of said plates supporting means (27-30) for controlling the temperature of said compartment and/or of said actuators (2).
3. A mechanism according to Claim 2, characterised in that said temperature control means comprise a ventilation unit (27) able to direct a current of cooling air (F) towards said supply and/or control unit (20) and/or towards said actuators (2).
4. A mechanism according to Claim 3, characterised in that said ventilation unit (27) is capable of creating an excess pressure in said compartment (22) compared with the ambient atmosphere.
5. A mechanism according to one of Claims 3 or 4, characterised in that said panels form or bear channels (31) for circulating air for ventilating said actuators (2), said channels being supplied with cooling air via said ventilation unit (27) and extending overall between said plates (23, 24).
6. A mechanism according to one of Claims 3 to 5, characterised in that it comprises a chamber (28) for pressurising the cooling air via said ventilation unit, said chamber communicating with said compartment (22) and/or channels (31) formed or borne by said panels (A, B) via orifices (23a, 23b) formed in said plate (23).
7. A mechanism according to Claim 6, characterised in that the plate (24) opposing said plate (23) is provided with exhaust ports (24a, 24b) for the cooling air coming from said compartment (22) and/or said channels (31).
8. A mechanism according to one of the preceding claims, characterised in that said panels are inclined relative to each other, the distance between them increasing upwards, an access opening (22a) to said compartment (22) being provided at the level of the upper edges of said panels.
9. A mechanism according to one of the preceding claims, characterised in that said panels (A, B) are formed of box elements (1) for receiving said actuators (2), said box elements being assembled together in rows and/or columns.
10. A loom, characterised in that it comprises a dobby mechanism (1-28) according to any one of the preceding claims.

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