EP0087376A1 - Device for winding textile materials having a brake element to stop the spooling at the end of the winding operation - Google Patents

Abstract

The device is for the winding of filaments onto a rotatably driven tubular support. According to the invention, one of the side-plates (6) intended to provide the holding of the tubular supports comprises an annular cage (13) having a lateral aperture (14), which is continuous and disposed facing the arm (3) on which the side-plate is mounted, at least one friction brake element (15) being held on the inside of this cage (13) and the support arm (3) being associated with retractable means (19) which are capable of coming into a position such that they cut the path of the braking element (15) in order to stop the winding. Application : winding of textile filaments <IMAGE>

Description

The present invention relates to an improvement made to the device allowing the winding of a wire on a winding support (tube), said support being driven in rotation by a driving cylinder against which it is in tangential support.

This winding technique has been known for a very long time and the devices used to implement it essentially comprise a pivoting stirrup formed by two parallel arms, the ends of said arms being provided with gripping flanges intended to be disposed at each end of the tubular support. , these flanges being mounted to rotate freely on an axis carried by the arms.

In order to facilitate the positioning and removal of the support between the retaining flanges, at least one of the stirrup arms can be moved laterally.

Furthermore, additional means are provided to ensure regular contact of the winding against the driving cylinder as the winding progresses.

One of the problems which arises with this type of device is that of the braking of the winding formed, in particular when it is desired to replace it with an empty tube. In fact, due to the increase in the speeds and the weight of the windings formed, when the stirrup is moved away from the drive cylinder, the produced coil continues to rotate freely for a period which can be quite long.

To solve this problem, various winding braking devices have been proposed to date.

Thus, French patent 2 367 011 describes a winding device in which the arm which can be moved laterally consists of two levers articulated relative to each other, the extreme lever carrying a brake pad so that when moves it, it rests on the periphery of the winding holding flange.

This embodiment is complex in that it comprises two levers and consequently two axes of articulation. In addition, braking depends essentially on the force exerted by the operator which can be either too weak or too high.

In his French patent application published under No. 2,460,877 (corresponding to US-A-4 328 928), the applicant has proposed a solution which makes it possible, to a large extent, to overcome these drawbacks.

According to this solution, the flange mounted on the movable arm of the stirrup is made in two parts, one forming a centering and holding element for the tubular support around which the wire is wound, the other, internal, mounted freely in rotation on an axis. carried by said arm. These two parts are interconnected by an element ensuring their radial rigidity with respect to each other, but allowing the axial displacement of the internal part with respect to the external part, so that during this displacement, braking surfaces come to bear on said external part.

Such a device is of particularly simple design and makes it possible to ensure rapid and effective braking of the winding formed. However, it has been found that, in the long run, there could be premature wear of the connecting element between the two parts of the flange (or centering) thus produced. In addition, the braking efficiency always depends on the force exerted by the user.

The invention aims to overcome these drawbacks.

It essentially relates to a device of the aforementioned type in which the braking efficiency is completely independent of the force exerted by the user. Furthermore, in a preferred embodiment, the device according to the invention allows not only to obtain the aforementioned result but also a braking command without any intervention from the operator, this being carried out automatically when the caliper is moved away from the driving device in order to allow the replacement of a coil full by an empty coil.

Generally speaking, the invention therefore relates to a device for winding a wire on a tubular support driven in rotation by tangential contact with a driving cylinder, a device which essentially comprises a stirrup pivoting about a fixed axis during the formation of the winding, this stirrup being made up of two parallel arms, carrying flanges mounted free in rotation on said arms and intended to ensure the maintenance of the tubular support, at least one of these arms being movable laterally to allow the establishment and the removal of the winding formed, this device comprising braking means making it possible to stop the rotation of the winding.

• - au moins l'un des flasques comporte une cage annulaire, présentant une ouverture latérale, continue, disposée en regard du bras support, au moins un élément de freinage par friction étant maintenu plaqué sur au moins une partie de la surface interne de cette cage et étant normalement entraîné en rotation avec ledit flasque lors du bobinage,
• - le bras support est associé à des moyens escamotables, susceptibles d'être amenés à l'intérieur de la cage dans une position telle qu'ils puissent venir couper le trajet de l'organe de freinage (ou d'un élément rapporté sur ledit organe de freinage) à l'intérieur de ladite cage, de telle sorte que, dans cette position, le frein soit immobilisé par rapport à la cage et provoque ainsi son arrêt par friction.

The device according to the invention is characterized in that:

• - At least one of the flanges has an annular cage, having a continuous lateral opening, disposed opposite the support arm, at least one friction braking element being held pressed against at least part of the internal surface of this cage and being normally driven in rotation with said flange during winding,
• - The support arm is associated with retractable means, capable of being brought inside the cage in a position such that they can come to cut the path of the braking member (or of an element attached to said braking member) inside said cage, so that, in this position, the brake is immobilized relative to the cage and thus causes it to stop by friction.

The friction braking elements used to the implementation of the device according to the invention, will consist of any known means, such as discs, pads, etc. Thus, they may consist of pads in one or more parts, for example three in number, these pads being disposed inside the cage and associated with a spring ring, this ring having a curved end intended to come into contact with the retractable elements when braking must be performed. Optionally, such braking elements can be constituted by a simple metal blade, disposed inside the cage, this metal blade also comprising a curved or raised portion intended to come into contact with the retractable means.

According to one embodiment of the invention, the retractable means are constituted by a finger subjected to the action of a spring, this finger being controlled by means of a flexible, external arm secured to the stirrup. In this embodiment, this retractable finger is brought into the path of the braking member (or of its holding elements) by exerting lateral pressure, the arm carrying the flange itself being slightly flexible, so that during braking, the contact pressure between the centralizer and the coil is increased, which avoids any relative sliding between these elements.

According to an improved variant of the device according to the invention, braking is performed automatically during the pivoting operation of the caliper, when it is desired to replace a full coil with an empty support. According to this embodiment, the retractable element consists of a simple pivoting stop, mounted on the arm, this stop being, in normal operation, located outside the path of the braking means and coming, by simple gravity effect, to cut the path of these braking means when the caliper is pivoted. Advantageously, in this embodiment, a system for locking the stop pivoting is provided to prevent it from moving during normal operation, for example as a result of vibrations which may occur.

• - la figure 1 est une vue d'ensemble en perspective d'un dispositif de bobinage conforme à l'invention,
• - la figure 2 est une coupe montrant en détail un mode de réalisation d'un flasque de maintien du support tubulaire sur lequel est enroulé le fil,
• - la figure 3 est une coupe selon l'axe AA de la figure 2, montrant plus en détail la manière dont sont fixés les éléments de freinage à l'intérieur de la cage,
• - les figures 4 et 5 sont également des vues de détail, en coupe longitudinale et en coupe selon l'axe BB d'un second mode de réalisation conforme à l'invention, mode dans lequel les moyens escamotables sont déplacés automatiquement sur le trajet des moyens de freinage lorsque l'on fait pivoter l'étrier,
• - la figure 6 est une vue en perspective, partielle du fonctionnement du dispositif illustré par les figures 4 et 5,
• - la figure 7 est une vue en perpective éclatée d'un dispositif similaire à celui illustré par les figures 4, 5 et 6 mais qui comporte en plus un système de verrouillage de l'élément escamotable pendant l'opération de bobinage,
• - les figures 8a à 8f illustrent de manière schématique la structure et le fonctionnement du dispositif illustré à la figure 7.

The invention and the advantages which it brings will then be better understood thanks to the exemplary embodiments given below by way of indication but not limitation and which are illustrated by the attached diagrams in which:

• FIG. 1 is an overall perspective view of a winding device according to the invention,
• FIG. 2 is a section showing in detail an embodiment of a flange for holding the tubular support on which the wire is wound,
• FIG. 3 is a section along the axis AA in FIG. 2, showing in more detail the manner in which the braking elements are fixed inside the cage,
• - Figures 4 and 5 are also detailed views, in longitudinal section and in section along the axis BB of a second embodiment according to the invention, mode in which the retractable means are moved automatically on the path of braking means when the caliper is pivoted,
• FIG. 6 is a partial perspective view of the operation of the device illustrated in FIGS. 4 and 5,
• FIG. 7 is an exploded perspective view of a device similar to that illustrated in FIGS. 4, 5 and 6 but which also comprises a system for locking the retractable element during the winding operation,
• - Figures 8a to 8f schematically illustrate the structure and operation of the device illustrated in Figure 7.

As can be seen in Figure 1, the winding device according to the invention consists essentially of a stirrup pivoting about a fixed axis (1) during the formation of the winding; this stirrup consists essentially of two parallel arms (2-3), carrying flanges, mounted free in rotation on these arms and intended to maintain the formed winding (4).

The rotary drive for the formation of the winding (4) is obtained by means of a driving cylinder (5) on which the winding is in tangential contact.

At least one of the arms, in this case the arm (3), can be moved laterally (position shown in dotted lines in FIG. 1), in order to facilitate the placement of an empty support and the removal of the winding formed. Furthermore, braking means produced in accordance with the invention, not visible in FIG. 1, making it possible to stop the rotation of the winding (4) when the caliper is moved away from the driving cylinder (5), for example during replacing the winding with an empty support tube.

Figures 2 and 3 illustrate in detail an embodiment according to the invention.

In this embodiment, the flange designated by the general reference (6) is mounted on the movable arm (3) of the stirrup.

Its external part (7) forms a centering and holding element for the tubular support (8) around which the element (4) of the wire is formed, and its internal part (9) is mounted to rotate freely, for example by means of 'A winding (10) on the fixed axis (11) carried on the arm (3).

According to the invention, the external part (7) of the flange has an annular cage (13) having a lateral opening (14), continuous, arranged opposite the movable arm (3). Inside this annular cage (13) is arranged a friction braking element (15) constituted, in this case, by Ferrodo pads. These braking elements are fixed against the internal face (16) of the cage (13) and support a metal rod (17) forming a spring and which plays the role of a shoe.

This rod (17) has an overhanging part (18) inside the cage.

Furthermore, the support arm (3) is associated with retractable means (19) capable of being brought inside the cage (13) in a position such that they can come to cut the path of the stop (18 ), that is to say of the element attached to the braking member (15) disposed in the cage. In this position, the retractable stop (19) therefore bears against the part (18) of the rod and, consequently, immobilizes it, which causes the assembly to stop by friction of the brakes (15).

In this embodiment, the retractable means consist of a stop (19) sliding in a slot (20) formed in the arm (3). This stop (19) is normally maintained in the retracted position by means of springs (21) (not shown). It rests against a flexible secondary arm (22) mounted on the arm (3). Consequently, to bring the stop (19) inside the cage (13), it suffices to press laterally on the secondary arm (22).

The operation of such a device is as follows.

In normal operation, the stop (19) is held outside the cage (13) by the action of the springs (21) and the braking elements (15) are therefore normally driven in rotation with the flange and the winding.

When it is desired to brake the winding formed, after having removed the stirrup from the driving cylinder (5), the secondary arm (22) is pressed, which makes the stop (19) penetrate inside the cage (13). As a result, this stop (19) cuts the path of the return (18) of the rod (17) in the present case, and therefore immobilizes the brakes (15) relative to the flange. These brakes act on the surface (16) of the cage and immobilize the winding.

Such a device is particularly designed simple and ensures rapid and efficient braking of the winding formed during a digging operation. Compared to previous devices, braking is performed gradually and automatically, without being a function of the force exerted by the operator.

Figures 4 and 5 illustrate in detail another embodiment of a device according to the invention, the operation of such a device being shown schematically in Figure 6. In this variant, the same references will be used to designate the same elements or similar elements as in the example illustrated by FIGS. 2 and 3.

Compared to the previous embodiment, the essential difference lies in the retractable means which can be brought into the path of the braking elements (or means making it possible to maintain them). In fact, in order to obtain automatic braking when the caliper is raised (position shown in dotted lines in FIG. 6), these retractable means will consist of a simple stop also referenced (19), this stop being mounted end of a sector (23) which can pivot freely around an axis (24) of the arm (3). This axis (24) and the shape of the sector (23) is determined so that the stop (19) is, when the winding is in contact with the driving cylinder (5) (position shown in solid lines at the Figure 6), in the low position, that is to say outside the path of the braking means (15) disposed inside the cage (13). When the winding (4) of the driving cylinder (5) is moved aside, by simple effect of gravity, the sector (23) rocks around the axis (24) and comes to cut the path of the braking means. It therefore therefore causes, as before, an action of these braking means inside the cage (13).

Compared to the embodiment illustrated in FIGS. 2 and 3, such a device has the advantage of being able to obtain automatic braking of the winding (4) without any intervention from the manipulator. In this exemplary embodiment, in order to avoid any relative sliding of the support tube with respect to the centralizing element proper, the latter will be produced so as to be able to obtain self-locking, for example by using an embodiment of the type of those described. in French patent application No. 81 07 738 of the Applicant published under No. ₂ 504 104.

FIG. 7 illustrates a variant of the device illustrated in FIGS. 4 and 5, a variant in which a member for locking the pivoting sector (23) carrying the stop (19) is provided to prevent the tilting of said sector in normal operation. In this variant, compared to the embodiment described above, a second pivoting sector (25) is provided and is mounted in equilibrium on the axis (11) carried by the arm (3). This locking element is essentially in the form of a plate on which is mounted a counterweight (26) which ensures its maintenance during the winding operation in a position such that the sector (27) of said plate pushes the stop (19) outside the path of the stop (18) attached to the braking member disposed inside the cage.

The structure and operation of such a device is clear from Figures 8a to 8f.

At the start of winding (FIG. 8a), the support tube being empty, the ramp (27) of the tilting locking element (25) bears on the stop (19) and therefore keeps the latter out of the way of the braking means. arranged inside the cage. At the end of winding (FIG. 8b), due to the enlargement of the reel, the assembly has slightly pivoted but the stop (19) is still kept locked.

The winding operation being finished, the arm carrying the full reel is tilted backwards (FIG. 8c and FIG. 8d) and automatically, - under the action of the counterweight (26), the first sector (25) pivots, which causes the release of the stop (19) and the tilting of the sector (23), so that said stop (19) comes to cut the path of the braking means in a similar manner to the example illustrated in FIGS. 4 and 5.

It is therefore possible to change the coil.

When an empty tube has been mounted, the arm is tilted forward to start a winding operation again (Figure 8e and Figure 8f) and during this tilting operation, the sector (23) switches backwards, which therefore disables the stop (19). Locking by the sector (25) is then carried out and the winding can be carried out, the various elements coming into the position illustrated in FIG. 8a when the tilting of the arm forward is completely carried out.

Compared to the example illustrated in FIGS. 4 and 5, such a device not only has the advantage of ensuring perfect locking of the retractable stop making it possible to control the braking means, which avoids any untimely stopping liable to occur. produce as a result of vibrations during the winding operation but, moreover, it also makes it possible to rotate the reel in the opposite direction if this is desirable as well as to automatically bring back the retractable element if it has not returned to it -even in its inactive position at the start of winding.

Of course, the invention is not limited to the embodiments described above, but it covers all the variants produced in the same spirit. Thus, instead of braking pads acting on the internal surface of the cage, it could be envisaged to use a disc brake or a braking assembly comprising two series of pads acting on two opposite faces. In addition, if in general, a single centering element is produced in accordance with the invention, it can be envisaged to equip the two support arms of the stirrup with such centering elements.

The brake pads will be based on all conventional materials used to fulfill such a function, for example based on a plastic material, a metal (bronze, steel ...).

Claims (7)

1 / Device for winding wire on a tubular support driven in rotation by tangential contact with a driving cylinder (5), essentially comprising a pivoting stirrup during the formation of the winding around a fixed axis (1), this stirrup consisting of two parallel arms (2-3), carrying flanges mounted free in rotation on said arms and intended to maintain the tubular support (8), at least one of the arms (2-3) being movable laterally to allow the establishment and removal of the winding formed and braking means being provided to allow the rotation of said winding to be stopped, characterized by the fact: - that one of the flanges (6) mounted on one of the arms (2-3) comprises an annular cage (13), having a lateral opening (14), continuous, arranged opposite said arm, at least one element friction braking (15) being held pressed against at least part of the surface of this cage (13) and being normally driven in rotation with said flange, - That the support arm (3) is associated with retractable means (19) capable of being moved inside the cage (13) in a position such that they can come to cut the path of the braking member (15) (or of an element attached to the braking member) so that, in this position, the brake (15) is immobilized with respect to the cage and thus causes the winding to stop. 2 / Device according to claim 1, characterized in that the braking means (15) consist of pads associated with a rod (17) having a curved portion (18). 3 / Device according to one of claims 1 and 2, characterized in that the retractable means consist of a finger (19) subjected to the action of a spring (21) for keeping it out of the cage (13) during the actual winding operation, this finger (.19) bearing on a flexible arm (22) secured to the arm (3) allowing it to be moved inside by simple lateral pressure of the cage (13) so that it comes to cut the path of the braking means. 4 / Device according to one of claims 1 and 2, characterized in that the retractable means are constituted by a pivoting stop (19) fixed on the arm, this stop (19) being, in normal operation, located out of the way braking means and coming, by simple gravity effect, to cut the path of this braking means when the caliper is pivoted. 5 / Device according to claim 4, characterized in that the retractable stop (19) is mounted at the end of a sector (23) which can pivot freely around an axis (24) of the arm (3), the position of this axis (24) as well as the shape of the sector (23) being determined so that the stop (19) is, when the winding is in contact with the driving cylinder (5) in the low position, it that is to say outside the path of the braking means (15) arranged inside the cage (13), while when the winding (4) of the driving cylinder (5) is moved aside, by simple effect of gravity, this sector (23) rocks around the axis (24) and comes to cut the path of the braking means. 6 / Apparatus according to claim 5, characterized in that it comprises a locking system of the retractable stop during the actual winding operation. 7 / Device according to claim 6, characterized in that said locking system is constituted by a second pivoting sector (25) having at its periphery a ramp (27) which bears on the stop (19) when the winding is in contact with the driving cylinder during the winding operation.

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