EP0285592B1 - Thread feeding device for weaving looms - Google Patents

Description

The present invention relates to an improved supplier device for weaving machines, see for example FR-A-2291304 associating more particularly a supplier composed mainly of a thread guide arm and a drum on the one hand, and an apparatus device placed in front of and / or behind the supplier, on the axis thereof, on the other hand. Specifically, the invention presented relates to a supply device at the outlet of which a grommet element can be introduced automatically, in the axial direction. This grommet element will automatically find the path to the input of the supplier device, where a weft thread can be attached to it, after which the removal of the grommet element automatically leads to the re-entry of the thread on the supplier and peripheral equipment.

We know that the weft thread can be manually retracted onto suppliers by passing a flexible material pass-through element, carrying the weft thread, successively through the supplier's organs such as thread guide arm, anti-balloon ring, etc. The invention presented provides a supplier device making it possible to return the weft yarn to both the supplier and the peripheral equipment, using a flexible grommet element and in a single operation.

For this, the supplier device provided by the invention is characterized in that it consists of a set of auxiliary and guide elements mounted on the peripheral equipment on the one hand and on the supplier on the other hand , and forming, with the conventional organs of the supplier, a guide path providing, for the flexible grommet element, an inlet and an outlet oriented in the axial direction.

The axial orientation of the inlet and outlet through which the grommet element passes offers the notable advantage of making such an improved supply device particularly suitable for automatic re-entry of the weft thread, due to the fact that a automatic grommet device will generally be presented axially in front of the supplier device, the weft thread to be fixed to the grommet element also being generally presented in the axis of the supplier device.

• la figure 1 représente un dispositif fournisseur prévu par l'invention;
• la figure 2 représente une vue schématique du dispositif fournisseur prévu par l'invention;
• la figure 3 représente une vue en perspective de la partie du dispositif repérée par F3 sur la figure 2;
• la figure 4 représente une vue en coupe selon la ligne IV-IV sur la figure 2;
• la figure 5 représente une vue schématique du tambour du fournisseur;
• la figure 6 représente une vue en perspective de la partie du dispositif repérée par F6 sur la figure 2;
• la figure 7 représente un autre état fonctionnel de la partie du dispositif illustré à la figure 6;
• la figure 8 représente une variante de la partie du dispositif illustrée à la figure 7;
• la figure 9 représente une vue en perspective de la partie du dispositif repérée par F9 sur la figure 2;
• les figures 10 et 11 représentent deux états fonctionnels d'un compensateur-frein de fil mis en oeuvre dans le cadre de l'invention présentée;
• les figures 12, 13 et 14 représentent différents compensateurs de fil pourvus de guide-fils mobiles;
• les figures 15 et 16 représentent deux autres compensateurs de fil, caractérisés par le fait que leurs guide-fils peuvent se séparer en deux parties;
• la figure 17 représente un autre guide-fil spécifique;
• la figure 18 illustre l'application de guide-fils conformes à celui illustré à la figure 17;
• la figure 19 représente une variante de la partie du dispositif illustrée à la figure 9.

In order to better highlight the characteristics of the invention, the description of some preferred embodiments is given below, by way of examples without limitation, with reference to the accompanying drawings, in which:

• FIG. 1 represents a supplier device provided by the invention;
• FIG. 2 represents a schematic view of the supplier device provided by the invention;
• FIG. 3 represents a perspective view of the part of the device identified by F3 in FIG. 2;
• 4 shows a sectional view along the line IV-IV in Figure 2;
• Figure 5 shows a schematic view of the supplier's drum;
• FIG. 6 represents a perspective view of the part of the device identified by F6 in FIG. 2;
• FIG. 7 represents another functional state of the part of the device illustrated in FIG. 6;
• FIG. 8 represents a variant of the part of the device illustrated in FIG. 7;
• Figure 9 shows a perspective view of the part of the device marked with F9 in Figure 2;
• Figures 10 and 11 show two functional states of a wire brake compensator implemented in the context of the invention presented;
• Figures 12, 13 and 14 show different thread compensators provided with movable thread guides;
• Figures 15 and 16 show two other wire compensators, characterized in that their wire guides can be separated into two parts;
• Figure 17 shows another specific thread guide;
• FIG. 18 illustrates the application of wire guides conforming to that illustrated in FIG. 17;
• FIG. 19 represents a variant of the part of the device illustrated in FIG. 9.

The supplier device illustrated in FIG. 1 mainly consists of a supplier 1 and a peripheral device placed at the input 2 and at the output 3 of this supplier; in the example illustrated, this apparatus consists of a wire brake 4 and a wire compensator 5, respectively.

The supplier 1 mainly consists of a drum 6 and a wire guide arm 7, as in conventional installations. Near the unwinding edge 8, the drum 6 conventionally comprises a crown 9 formed of flexible metal strips acting as an anti-bloating device.

The wire brake 4 is formed mainly of two nozzles 10 and 11 interacting and between which a wire can be led.

The thread compensator 5 mainly consists of two thread guides 12 and 13, constituted for example by two eyelets, between which the thread can be subjected to the action of a pressure element 14.

The invention presented is distinguished by the fact that the supplier device is provided, both at the level of the supplier 1 and at the height of the peripheral apparatus, with a set of guide elements forming, with the conventional members that the we just mentioned, a path allowing the guide of the grommet element 15 so that the latter can be pushed in a single movement through the supplying device, more particularly from the outlet 3 to the inlet 2, so that a weft thread 16 can be fixed to the thread guide element 15 when the latter has reached the thread brake 4. By a return movement of the thread guide element 15, the thread of frame 16 can then be returned to the supplier device.

The main guide elements and auxiliary elements which equip the supplier device and which are represented in the two figures 1 and 2, essentially consist of elements 17 which can exert an opening force on the pressure element 14 of the thread compensator 5 , a hub cover 18 placed at the end of the drum 6, a recess or a channel 19 formed in the drum 6 and an element 20 intended to force the opening of the wire brake 4.

Regarding supplier 1, the hub cover 18 mentioned above is placed in the axis of the drum 6, on the outlet side 3 thereof. As illustrated in FIG. 3, this hub cover 18 takes the form of a cone in which a guide 21 is made, for example in the form of a groove. The cutout 19 mentioned above extends this groove and has a path as illustrated in Figure 2; a sectional view of this cutout is given in FIG. 4. The latter makes it possible to clearly observe that the cutout 19 consists of a T-groove in which the transverse part 22 is intended to guide the grommet element 15 , while the longitudinal part 23 provides the passage for the weft thread to be returned to the drum during the return stroke of the grommet element 15. The cutout 19 ensures a smooth transition between the end piece 24 and the surface of winding 25 of the drum 6.

FIG. 5 also shows that during normal operation of the supplier, the movement of the weft thread 16 is in no way hampered by the cutout 19 mentioned above, since the weft thread leaves the drum at a suitable angle with respect to cutting 19.

FIGS. 6 and 7 give a schematic view of the operation of the elements 17 intended to force the movement of the pressure element 14 between the thread guides 12 and 13, so as to open the passage to the thread pass element 15. The elements 17 could, for example, consist of an ordinary push rod, but also, as illustrated in FIG. 8, include a thread guide element 26, the movement of which can force the pressure element on the side 14 of the compensator, while guiding the grommet element 15 between the thread guides 12 and 13 when it is at rest.

The wire brake 4 mentioned above is equipped with one or more elements 20 which, animated by a suitably chosen movement, can open the wire brake 4 so as to allow passage to the wire pass element 15 .

The supplier can also be provided with control and drive devices which, when the thread guide arm and / or the drum are stopped, ensure the alignment of the end of the thread guide arm 7 and of the cutout 19 Therefore, a grommet element 15 once introduced into the axis of the thread compensator 5, this element may be through the entire supplier device, after which, a weft thread 16 once fixed to this grommet element and this once retracted, the weft thread 16 will be driven both through the thread brake 4, the supplier 1 and the thread compensator 5.

It is clear that the peripheral equipment mentioned above can also include several elements, and that, both at input 2 and at output 3, a wire brake 4 or a wire compensator can be provided. 5, or a combination of several of these elements. This is why the description of some variants of installations or parts of installations in accordance with the invention is given below.

FIG. 10 illustrates a wire brake compensator 27, conventionally composed of two elements 28 and 29 articulated to each other by a spring hinge, and the opposing faces of which are provided with eyelets or wire guides , 30 and 31 respectively, arranged alternately on each of these faces. During normal operation of such a brake compensator, the weft thread 16 is guided along the path illustrated in FIG. 10, the spacing of the elements 28 and 29 (whose relative position is adjusted by the spring hinge) creating , on the one hand, a braking effect and, on the other hand, a compensation effect on the weft thread 16.

The invention presented provides for the presence of a closing device intended to bring the elements 28 and 29 of which mentioned above, such that the eyelets 30 and 31 shown in FIG. 11 are placed in line with each other. others, thus providing passage to the grommet element 15. This closing device can consist, for example, of pressure elements 32 and 33, the bringing together of which can command the closing of the brake compensator 27. It goes from it is clear that this closing device can be produced by other embodiments.

FIGS. 12 to 14 show a series of variants in accordance with the invention, in which the brake compensator 5 described above is characterized by a mobile design which allows it to be moved in the radial direction, more particularly providing for the possibility of a displacement, relative to the axis 36 of the device, of the wire guides 12 and 13 or, at the very least, of the guide eyelets 34 and 35 proper.

In FIG. 12, the wire guides 12 and 13 are mounted on an axis and can pivot so that their free end and, consequently, their guide eyelet 34 or 35, can be aligned with respect to the cutout 19. It It is clear that in this case, the hub cover 18 becomes useless.

In the variant presented in FIG. 13, the wire guides 12 and 13 pivot by an even greater angle, so as to present the eyelets 34 and 35 in the extension of the outlet 37. In this case, the cutout 19 of the drum 6 also becomes useless, since the thread passage element 15 can be pushed directly from the thread compensator 5 into the thread guide arm 7.

According to FIG. 14, the axial movement is obtained by moving the entire compensator 5, for example on a slide 38. It is clear that in the two embodiments illustrated in FIGS. 13 and 14, brushes 39 will be used in preference to crown 9 with metal strips. The grommet element 15 can in this case be easily pushed through the bristles of the brushes.

Figures 15 and 16 illustrate two other embodiments of a wire compensator 15, in which the wire guides 12 and 13 are composed of two parts, so that the spacing thereof, designated respectively by 12A, 12B and 13A, 13B, controls the opening of the eyelets themselves 34 and 35.

In the embodiment illustrated in FIG. 15, the wire guides 12 and 13 are divided into two parts along their longitudinal axis, one of them (designated by 12A and 13A, respectively) can pivot in a radial direction at height of the eyelets 34 and 35. The operation of this device consists in that the parts 12A and 13A will pivot to allow the retraction of the weft thread (position indicated in dotted lines), after which the weft thread will be passed through the arm thread guide 7 using the thread pass element 15, the latter now stretching the weft thread 16; then the parts 12A and 13A will switch to the rest position, against the parts 12B and 13B, so that the weft thread 16 will pass through the eyelets 34 and 35, now closed.

FIG. 16 gives a variant in which the wire guides 12 and 13 are divided transversely into two parts A and B, the parts 12A and 13A being mobile and the parts 12B and 13B, fixed. The displacement of the parts 12A and 13B makes it possible to obtain an operation similar to that of the embodiment presented in FIG. 15.

The thread guides 12 and 13 mentioned above, as well as the thread guides fitted to any other peripheral equipment, may also be provided with eyelets 34-35 in accordance with that illustrated in FIG. 17. The ends of the wire guides are here formed by partially open eyelet sections 40-42 and placed in overlap, and provided on their inner periphery with suitable guide surfaces 43-45. As indicated in FIG. 17, a weft thread 16 can then be introduced into the eyelets 34 and 35 by simple pressure, the construction of the assembly guaranteeing any risk of the thread coming out.

FIG. 18 illustrates a particular application of the eyelets 34 and 35 mentioned above, in a device provided with a hinge movement allowing a reciprocal movement of the wire guides 12 and 13 in order to force the wire weft 16 in the eyelets 34 and 35.

Figure 19 gives another variant of the wire brake 4 mentioned above, in which this brake, provided with raised edges 46 and 47, can move laterally along the arrow P. The raised edges allow the introduction of the element grommet 15 in a simple way: it will suffice to pass the weft thread 16, after which the thread brake 4 can be brought back in place by a movement according to arrow P. The noses 10 and 11 will pinch the thread frame 16 to place it properly between these spouts. The weft brake 4 can be moved according to arrow P at an earlier moment, so as to guide the movement of the grommet element 15 during its passage.

It should be noted that the grommet element 15 may be hollow, so that after its introduction into the supplying device, the weft thread 16 can be blown or sucked through the grommet element, after which , this element once removed from the supplying device, the weft thread 16 will be returned to the supplying device in an appropriate manner.

The scope of the invention presented is in no way limited to the embodiments described by way of examples and shown in the accompanying drawings; on the contrary, this improved supplier device for weaving machines can be produced in any shape and size without falling outside the scope of the invention.

Claims (14)

1. Supply element for weaving machines, of the type made up of the combination of a supplier (1) which is mainly composed of a thread guide arm (7), a drum (6) and peripheral parts (4, 5) placed in front of and/or behind the supplier (1), and characterized in that the supply element has been provided with a combination of auxiliary means and guide means mounted on the peripheral parts on the one hand and on the supplier on the other hand, forming a passage, together with the components of the supplier (1), having an entry and an exit situated axially towards each other, such that it ensures the guiding of a threading element (15).

2. Supply element according to claim 1, characterized in that the drum (6) has been provided with a hub cover (18), placed on the axis of the latter, to ensure the guiding of the thread guide element (15).

3. Improved supply element according to claim 1, characterized in that the drum (6) has a continuous incision (19) assuring the transition between the surface of the bobbin (25) and the end (24) of the drum (6).

4. Improved supply element according to claim 3, characterized in that the drum (6) has been provided with a hub cover (18), placed on its axis, to ensure the guiding (21) of the thread guide element (15), the guiding (21) having a far end placed in the extension of the above-mentioned incision (19) in said drum (6), whereas the other far end of the guiding (21) is placed in line with the axis of the exit (3) of the drum (6).

5. Improved supply element according to claim 3 or 4, characterized in that the incision (19) in the drum (6) is T-shaped.

6. Improved supply element according to any of the above claims, whose peripheral parts contain at least one thread tensioner (5) composed of two thread guides (12,13) situated in the extension of the axis of the drum (6) and in between which a pressure element (14) has been placed that can act upon the weft thread (16), an element characterized in that the thread tensioner is equipped with elements (17) which make it possible to remove the pressure element (14) from its operating zone.

7. Improved supply element according to claim 6, characterized in that the elements (17) of the thread tensioner (5) which make it possible to remove the pressure element (14) from its operating zone have been equipped with an element (26) which allows for the guidance of a flexible threading element (15), the guide element (26) stretching out between the thread guides (12, 13) of the thread tensioner (5).

8. Improved supply element according to any of the above claims, whose peripheral parts contain at least a yarn brake (4), characterized in that it has been provided with elements (20) which make it possible to force an opening and/or to create a passage for the threading element (15) in between the boxes (10, 11) of the yarn brake (4).

9. Improved supply element according to any of the above claims, whose peripheral parts contain at least one yarn brake tensioner (27), composed of two elements (28, 29) connected by a spring hinge, and whose opposite faces have been provided with thread eyes or thread guides (30 and 31), the element being characterized in that the yarn brake tensioner (27) has been provided with locking elements (32, 33).

10. Improved supply element according to any of the above claims, whose peripheral parts contain a certain number of thread eyes (34, 35) placed in the extension of the axis of the supplier and characterized in that at least the thread eyes (34, 35) can move in a radial sense.

11. Improved supply element according to claim 10, whose peripheral parts contain at least a yarn brake tensioner (5), consisting of two thread guides (12, 13) placed in the extension of the axis of the drum (6) and a pressure element (14) that can act upon the weft thread (16), characterized in that the thread guides (12, 13) can be put in line on the axis (36), at least at the height of the actual thread eyes (34, 35) on the one hand, and that they can be conducted in the direction of the axial extension of the exit (37) of the thread guide arm (7) on the other hand.

12. Improved supply element according to claim 3, whose peripheral parts contain at least a yarn brake tensioner (5), consisting of two thread guides (12, 13) placed in the extension of the axis of the drum (6) and a pressure element (14) that can act upon the weft thread (16), characterized in that the thread guides (12, 13), or at least the part corresponding to their actual thread eyes (34, 35), are moveable and can be presented at the centre of the supplier (1) on the one hand, and can be conducted to the incision (19) of the drum (6) on the other hand.

13. Improved supply element according to claim 1, whose peripheral parts contain at least a yarn brake tensioner (5), consisting of two thread guides (12, 13) placed in the extension of the axis of the drum (6) and a pressure element (14) that can act upon the weft thread (16), characterized in that the thread guides (12, 13) are composed of two parts, whereby the actual thread eyes (34, 35) can be opened by separating said two parts, whereby one of these (12A, 13A) can also swivel radially.
14. Improved supply element according to any of the above claims, whose peripheral parts contain a certain number of thread eyes (34, 35), characterized in that said thread eyes (34, 35) are composed of at least two sections of thread eyes (40-42) which are partially open and overlap each other, and which mainly have thread guide surfaces (43-45) along their interior contours.

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