ES2883423T3 - Installation for regulating the tension of a metallic monofilament and winding of the metallic monofilament - Google Patents

Abstract

Installation (2) for regulating the tension of a metallic monofilament (4) and for winding the metallic monofilament (4), comprising: - a device (6) for regulating the tension of the metallic monofilament, - a device (8) winding of the metallic monofilament arranged downstream of the regulation device in the direction of movement of the metallic monofilament, the regulation device (6) comprising: - a frame (10), - at least one tension regulation pulley (12) of the metallic monofilament (4), mounted mobile in rotation with respect to the frame (10) around an axis (14) of rotation of the regulation pulley, the regulation pulley (12) being mounted mobile in translation with respect to the frame ( 10) along a direction substantially perpendicular to the axis (14) of rotation of the regulation pulley, the regulation pulley (12) being arranged to move freely in translation with respect to the frame (10) under the effects of tension of the metallic monofilament (4) and of the weight of the regulating pulley, - means (16) for detecting at least one critical threshold of an indicator of the winding tension of the metallic monofilament (4) corresponding to a tension value of critical upper winding, the winding device (8) comprising: - a winding spool (18) mobile in rotation about a winding axis (20), - means (22) for driving the rotation of the spool (18) of winding around the winding axis (20), the installation (2) comprising means (24) for regulating the drive means (22) and connected to the drive means (22) and to the detection means (16) to reduce the speed of rotation of the winding reel (18) when the indicator reaches the critical threshold corresponding to the upper critical winding tension value, the regulation means (24) being arranged in such a way that the tension value critical upper winding pressure is less than or equal to 1000 g, the installation being characterized in that the or each regulation pulley (12) comprises a monolithic pulley sheave (17) made of a material with a density less than or equal to 7 g .cm-3, preferably at 2 g.cm-3.

Description

DESCRIPTION

installation for regulating the tension of a metallic monofilament and for winding the metallic monofilament

The object of the invention is an installation for regulating the tension of a metallic monofilament and for winding the metallic monofilament.

The invention applies to any type of metallic monofilament and in particular to carbon steel monofilaments that form a metallic reinforcement intended to be used in a tire.

Document JP 2002282929 A, on which the preamble of claim 1 is based, discloses an installation for regulating the tension of a metallic monofilament and for winding the metallic monofilament.

Installations for the manufacture of a metallic monofilament are known from the state of the art and comprise, in this order in the direction of movement of the metallic monofilament, a device for drawing the metallic monofilament, a device for straightening the metallic monofilament and a winding device. of the metallic monofilament that allows the metallic monofilament to be stored and that comprises a storage coil around which the metallic monofilament is wound.

Since this metallic monofilament is intended to be used directly in layers and then in tires, it is preferable that the metallic monofilament obtained from a drawing device is a monofilament that has as low a curvature as possible to avoid any problem of flatness of a layer. obtained by calendering several of these metallic monofilaments. In fact, non-flat plies give rise to ply cutting and bonding problems during tire manufacturing.

Tension regulation devices located between the straightening device and the winding device are known from the state of the art. However, the inventors have realized that such tension regulating devices, by virtue of the minimum tension that they applied to the metallic monofilament, introduce, during the winding stage of the metallic monofilament, an additional curvature in the metallic monofilament beyond of the acceptable level to allow a correct calendering of the metallic monofilaments and the obtaining of flat layers.

Therefore, there is a need for an installation and a method that allows limiting or even eliminating the introduction of an additional bend in the metallic monofilament during the winding step of the metallic monofilament.

The object of the invention is to provide a device and a method for winding and adjusting the tension that make it possible to obtain a straight metallic monofilament.

To this end, the present invention has as its object an installation for regulating the tension of a metallic monofilament and for winding the metallic monofilament according to claim 1.

Advantageously, the installation according to the invention makes it possible to reduce or even eliminate the introduction of an additional bend in the metallic monofilament during the winding stage.

In fact, the inventors at the origin of the invention have identified that the main reason for the introduction of additional curvature during the winding step of the metallic monofilament was too high a winding tension of the metallic monofilament.

Thanks to the installation according to the invention, and in particular thanks to the free movement of the regulating pulley or pulleys, the tension applied to the metallic monofilament is only a function of the weight of the pulley or pulleys, the number of pulleys, of the winding speed, as well as its piloting. Thus, depending on the tolerable additional curvature, a person skilled in the art will determine the number and nature of the pulley or pulleys, the mass of the elements of the regulation device that apply a tension to the metallic monofilament, but also the critical upper winding tension value. According to the invention, when the indicator reaches the critical threshold corresponding to the upper critical winding tension value, the regulation means allow the rotation speed of the winding spool to be reduced and, therefore, the winding tension applied to the metallic monofilament. . This limits the introduction of additional bend in the metallic monofilament. Therefore, it is by acting on the winding speed that the winding tension is controlled and, therefore, the additional curvature.

Finally, thanks to the use of a relatively low winding tension, it is possible to wind a long length of metallic monofilament on the winding spool without running the risk of crushing the hub of the spool when it is made of steel, or without the need of changing the hub of the coil for a stronger and more expensive hub. In fact, during winding, successively wound layers exert a contracting force. This contraction force is greater the greater the number of layers wound and the greater the winding tension. Using too high a winding tension, as is the case in the state of the technique, the hub of the coil collapses when a relatively low number of layers wound on the coil is reached. By using the device according to the invention and therefore a relatively low winding tension, the number of layers that can be wound around the hub and therefore the storage capacity of the coils is increased. .

By metallic monofilament is meant a monofilament made from a metallic material, this material being able to be constituted by a metallic core and optionally by one or more layers of metallic or non-metallic coating. Such coating layers can be, for example, a brass layer, a layer of an adhesive composition or else a layer of an adhesive primer. Such a metallic monofilament has a main axis that describes a substantially rectilinear path when it is held under low tension. In other words, it is not preformed, it does not have any helical or wavy shape, and it is not assembled (in contact) with another metallic monofilament.

The installation according to the invention may also comprise one or more of the following characteristics, considered individually or according to all technically possible combinations:

- The regulation means are arranged to reduce the speed of rotation of the winding reel whenever the indicator exceeds the critical threshold corresponding to the upper critical winding tension value. Thus, the decrease in rotation speed is continuous until the winding tension value becomes sufficiently low again, that is, as long as the indicator exceeds the critical threshold corresponding to the critical upper winding tension value. By exceeding it is meant that, when the indicator is an increasing function of rotation speed, exceeding means being greater than the critical threshold and that, when the indicator is a decreasing function of rotation speed, exceeding means being below the threshold. critical, and/or

- The regulation means are arranged so that the critical upper winding tension value is less than or equal to 800 g, preferably 600 g and more preferably 500 g. The higher the critical upper winding tension value, the greater the additional bend introduced into the metallic monofilament. Thus, it is preferable to reduce this critical upper winding tension value as much as possible depending on the tolerable additional curvature and the rotation speed that also conditions the productivity of the installation; me

- The installation comprises means for detecting at least one critical threshold of a metallic monofilament winding tension indicator corresponding to a lower critical winding tension value; me

- The regulation means of the driving means are connected to the driving means and to the detection means in order to increase the rotation speed of the winding reel when the indicator reaches the critical threshold corresponding to the winding tension value critical bottom. This thus makes it possible to avoid any fluctuation of the metallic monofilament in the installation and to eliminate any risk of the monofilament coming out of the different constituent elements of the installation, in particular any coming out of the pulleys or of the guide elements; me

- The regulation means are arranged to increase the speed of rotation of the winding spool whenever the indicator exceeds the critical threshold corresponding to the lower critical winding tension value. Thus, the increase in rotational speed is continuous until the winding tension value becomes sufficiently high again, that is, as long as the indicator exceeds the critical threshold corresponding to the lower critical winding tension value. By exceeding it is meant that, when the indicator is an increasing function of rotational speed, exceeding means being greater than the critical threshold and that, when the indicator is a decreasing function of rotational speed, exceeding means being less than the critical threshold; me

- the regulation means are arranged so that the critical lower winding tension value is greater than or equal to 150 g, preferably 200 g, more preferably 300 g. The higher the critical lower winding tension value, the lower the risk of fluctuation; me

- The detection means comprise means for measuring the winding tension of the metallic monofilament between the regulation device and the winding device. Such detection means make it possible to directly determine the winding tension of the metallic monofilament. Thus, the winding tension indicator is, in this embodiment, the winding tension of the metallic monofilament itself. In order to have a significant tension of the winding tension of the monofilament on the winding spool, the means for measuring the tension are arranged downstream of the regulation device and upstream of the winding arrangement; me

- The regulation means are arranged to reduce the speed of rotation of the winding spool when the winding tension of the metallic monofilament exceeds the critical upper winding tension value; me

- The regulation means are arranged to increase the speed of rotation of the winding spool when the winding tension of the metallic monofilament drops below the critical lower winding tension value; me

- The regulation means are arranged to reduce the speed of rotation of the winding spool whenever the winding tension of the metallic monofilament is above the critical upper winding tension value; me

- The regulation means are arranged to increase the speed of rotation of the winding spool when the winding tension of the metallic monofilament is below the critical lower winding tension value; me

- The regulation means are arranged to increase the speed of rotation of the winding spool whenever the winding tension of the metallic monofilament is below the critical lower winding tension value; me

- The detection means comprise means for detecting at least one critical position of the regulating pulley corresponding to the critical upper critical winding tension value. Such detection means make it possible to indirectly determine the winding tension of the metallic monofilament. Thus, the winding tension indicator is, in this embodiment, the position of the regulating pulley. Furthermore, in this embodiment, the sole detection of the critical position is sufficient to detect the achievement of the critical upper winding tension value, unlike the embodiment in which the winding tension is measured directly and in which requires continuous measurement. The critical position can be characterized by an angle value or a function of the angle value, a coast value or a function of the coast value, the activation of a sensor, whatever the nature of this sensor (optical, pressure , proximity, contact, sound, etc.); me

- The regulation means are arranged to reduce the speed of rotation of the winding reel when the regulation pulley reaches the critical position corresponding to the critical upper winding tension value; me

- The regulation means are arranged to reduce the speed of rotation of the winding spool whenever the regulation pulley exceeds the critical position corresponding to the upper critical winding tension value; me

- the detection means comprise means for detecting at least one critical position of the regulating pulley corresponding to the critical lower winding tension value. Analogously to the above, the winding tension indicator is, in this embodiment, the position of the regulating pulley. Furthermore, in this embodiment, the sole detection of the critical position is sufficient to detect the achievement of the critical lower winding tension value, unlike the embodiment in which the winding tension is measured directly and in which requires continuous measurement. The critical position can also be characterized by an angle value or a function of the angle value, a coast value or a function of the coast value, the activation of a sensor, whatever the nature of this sensor (optical, pressure, proximity, contact, sound, etc.); me

- The detection means comprise means for detecting at least one critical position of the regulation pulley corresponding to a critical lower winding tension value; me

- The regulation means are arranged to increase the speed of rotation of the winding reel when the regulation pulley reaches the critical position corresponding to a lower critical winding tension value; me

- The regulation means are arranged to increase the speed of rotation of the winding spool whenever the regulation pulley exceeds the critical position corresponding to a lower critical winding tension value; me

- The adjustment device comprises means for guiding the regulation pulley in curvilinear translation with respect to the frame, preferably means for guiding the regulation pulley in circular translation with respect to the frame; me

- The curvilinear translational guide means comprise a lever carrying the adjustment pulley, the adjustment pulley being mounted movable in rotation with respect to the lever, the movable lever being mounted in rotation with respect to the frame around a rotation axis of the lever; me

- The adjustment device comprises guide means in rectilinear translation of the adjustment pulley with respect to the frame; me

- The guide means in rectilinear translation comprise a guide slider for the regulation pulley, the axis of the regulation pulley moving in translation being mounted on the guide slider; me

- The regulation device comprises several pulleys for regulating the tension of the metallic monofilament mounted mobile in rotation with respect to the frame around a common axis of rotation of the regulation pulleys, each regulation pulley being mounted mobile in translation with respect to the frame along a direction substantially perpendicular to the common axis of rotation of the regulation pulleys, the regulation pulleys being arranged to move freely in translation with respect to the frame under the effects of the tension of the metallic monofilament and the weight of the regulation pulleys; me

- The regulation pulleys are mobile in rotation independently of each other; me

- The adjustment device comprises at least one metal monofilament return pulley mounted movable in rotation with respect to the frame around an axis of rotation of the return pulley, the return pulley being fixed in translation with respect to the frame; me

- The adjustment device comprises several return pulleys of the metal monofilament mounted movable in rotation with respect to the frame around a common axis of rotation of the return pulleys, each return pulley being fixed in translation with respect to the frame; me

- The return pulleys are mobile in rotation independently of each other; me

- The mass of the regulating pulley or pulleys is less than or equal to 1,500 g, preferably 800 g; me

- According to the invention, the or each regulating pulley comprises a monolithic pulley sheave made of a material having a density less than or equal to 7 g.cm-3, preferably 2 g.cm-3. By monolithic it is understood that the sheave forms a molded part that consists of a single element, unlike a sheave that consists of several elements made of materials of different nature and assembled together; me

- The sheave of the pulley or of each regulating pulley is made of a polymeric material. Such examples of polymeric material are nylon, polyester or also polytetrafluoroethylene; me

- The pulley or each regulation pulley comprises a pulley with a substantially cylindrical shape having a diameter Dc of the metallic monofilament winding at least partially around the pulley the diameter Dc verifies the relationship Dc > 200.d where d is the diameter of the metallic monofilament. Thanks to such regulating pulleys, the risk of introducing additional curvature is further reduced; me

- The pulley or each return pulley comprises a roughly cylindrical pulley having a diameter Dr for winding the metallic monofilament at least partially around the pulley, the diameter Dr verifies the relation Dr > 200.d where d is the diameter of the metallic monofilament. Thanks to such return pulleys, the risk of introducing additional bending is further reduced; me

- The winding coil comprises a substantially cylindrical-shaped coil hub having a diameter De for winding the metal monofilament around the hub, the diameter De verifies De > 200.d. Again, this allows the risk of introducing additional curvature to be further reduced.

The invention finally relates to a method for regulating the tension of a metallic monofilament and for winding the metallic monofilament by means of the installation for regulating the tension of a metallic monofilament and for winding the metallic monofilament according to the invention, a method in wherein a critical threshold of a metallic monofilament winding tension indicator corresponding to a critical upper winding tension value is detected, and wherein, when the indicator reaches the critical threshold corresponding to the critical upper winding tension value , the rotational speed of the winding spool is reduced.

The procedure may comprise one or more of the following features, considered individually or in all technically possible combinations:

- The winding spool rotation speed is reduced whenever the indicator exceeds the critical threshold corresponding to the upper critical winding tension value; me

- A critical threshold of a metallic monofilament winding tension indicator corresponding to a lower critical winding tension value is detected; me

- When the indicator reaches the critical threshold corresponding to the critical value of the lowest winding voltage, the rotation speed of the winding coil increases; me

- The winding reel rotation speed is increased whenever the indicator exceeds the critical threshold corresponding to the lower critical winding tension value; me

- The winding tension of the metallic monofilament between the regulation device and the winding device is measured; me

- The rotation speed of the winding spool is reduced when the winding tension of the metallic monofilament goes above the critical upper winding tension value; me

- The rotational speed of the winding spool is reduced whenever the winding tension of the metallic monofilament increases above the critical upper winding tension value; me

- The rotational speed of the winding spool is increased when the winding tension of the metallic monofilament falls below a critical lower winding tension value; me

- The rotational speed of the winding spool is increased whenever the winding tension of the metallic monofilament is below the critical lower winding tension value; me

- At least one critical position of the regulating pulley corresponding to the critical upper winding tension value is detected; me

- The rotation speed of the winding reel is reduced when the regulation pulley reaches the critical position corresponding to the upper critical winding tension value; me

- The rotation speed of the winding reel is reduced whenever the regulation pulley exceeds the critical position corresponding to the upper critical winding tension value; me

- At least one critical position of the regulating pulley corresponding to a lower critical winding tension value is detected; me

- The rotation speed of the winding reel is increased when the regulation pulley reaches the critical position corresponding to a lower critical winding tension value; me

- The winding reel rotation speed is increased whenever the regulation pulley exceeds the critical position corresponding to a lower critical winding tension value; me

- The metallic monofilament has a diameter d ranging from 0.05 to 0.50 mm, preferably from 0.10 mm to 0.45 mm, more preferably from 0.25 mm to 0.45 mm and even more preferably from 0 .28mm to 0.40mm.

- The critical upper winding tension value is less than or equal to 1000 g, preferably 800 g, more preferably 600 g and even more preferably 500 g.

- The critical lower winding tension value is greater than or equal to 150 g, preferably 200 g, more preferably 300 g.

- Preferably, such metallic monofilament comprises a metallic core of steel. Preferably, the steel comprises a content of carbon ranging from 0.2% to 1% by mass and more preferably from 0.4% to 0.9% by mass. Preferably, the steel comprises a manganese content ranging from 0.3% to 0.7% by mass, a silicon content ranging from 0.1% to 0.3% by mass, a phosphorous content ranging as maximum up to 0.045% terminal included by mass, a sulfur rate that goes up to a maximum of 0.045% terminal included by mass and a nitrogen rate that goes up to a maximum of 0.008% terminal included by mass. Optionally, the steel comprises at most 0.1% included terminal, preferably 0.05% included terminal and more preferably 0.02% included terminal by mass of vanadium and/or molybdenum. In one embodiment, the steel used comprises less than 0.5%, preferably at most 0.05% included terminal, and more preferably at most 0.02% included terminal by mass of chromium. In another embodiment using so-called stainless steel, the steel comprises at least 0.5% included terminal, preferably at least 5% included terminal, and more preferably at least 15% included terminal by mass of chromium. Preferably, a stainless steel comprises at least 2% terminal included, preferably at least 4% terminal included, and more preferably at least 6% nickel by mass.

The present invention will be better understood in the light of the following description, which is given solely by way of indication and is not intended to limit said invention, accompanied by the following figures:

Figure 1 illustrates an installation for regulating the tension and winding of a metallic monofilament according to a first embodiment,

Figure 2 illustrates this installation according to a second embodiment,

Figure 3 illustrates this installation according to a third embodiment,

Figures 4a and 4b illustrate the regulation pulleys and the return pulleys of these installations, and

Figure 5 illustrates a winding coil of these installations.

In the different figures, similar elements are designated with identical references. In addition, the different elements are not necessarily represented to scale to present a view that facilitates the understanding of the invention.

FIG. 1 shows an installation 2 for regulating the tension of a metallic monofilament 4 and for winding the metallic monofilament 4 according to a first embodiment. This installation 2 comprises a device 6 for regulating the tension of the metallic monofilament 4 and a device 8 for winding the metallic monofilament 4. The winding device 8 is arranged downstream of the regulation device 6 in the direction of displacement of the metallic monofilament 4. .

The purpose of the tension regulation device 6 is to regulate the tension of the metallic monofilament 4 before the winding stage and to prevent the introduction of an intolerable additional bend in the metallic monofilament 4. In fact, too high a winding tension can cause the introduction of an intolerable additional curvature in the metallic monofilament 4 during the winding of the metallic monofilament 4. On the contrary, a too low winding tension can cause a fluctuation phenomenon, then the metallic monofilament 4 runs the risk of coming out of the elements of installation 2, in particular of the guide elements. Therefore, it is preferable to maintain a certain tension without, however, exceeding a critical upper winding tension.

The device 6 for regulating the tension of the metallic monofilament 4 comprises a frame 10 and at least one pulley 12 for regulating the tension of the metallic monofilament 4. The regulating pulley 12 comprises a pulley sheave 13. This sheave 13 is monolithic and is here made of a material having a density less than or equal to 7 g.cm-3, preferably 2 g.cm-3, in this case of a polymeric material, here nylon. The pulley is an element subjected to high mechanical stresses. Therefore, the sheave material that is in contact with the monofilament must be strong enough to resist tensile stresses, but also frictional wear. In addition, the polymeric material makes it possible to obtain a pulley that is light enough not to increase the winding tension too much, while guaranteeing the regulation function of the pulley 12. The pulley 11 has a winding diameter Dc of the metallic monofilament 4 at least partially around the pulley 11. The diameter Dc verifies the relation Dc > 200.d in which d is the diameter of the metallic monofilament 4. In this case, the diameter Dc is here the diameter of the outer surface of a groove for the passage of the monofilament metallic 4 and here Dc = 100 mm. The regulation pulley 12 is mounted so that it can rotate with respect to the frame 10 around a rotation axis 14, for example by means of a bearing interposed between the sheave 11 and the axis 14 or by direct contact between the sheave 11 and the axis 14. Furthermore, the adjustment pulley 12 is mobile in translation with respect to the frame 10 along a direction substantially perpendicular to its axis 14 of rotation. The regulation pulley 12 is arranged to move freely in translation with respect to the frame 10 under the effect of its own weight and the tension of the metallic monofilament 4 that is wound at least partially around the regulation pulley 12. Thus, the regulation pulley 12 is not motorized, nor activated by any mechanical device capable of giving a different movement to the metallic monofilament 4 and its own weight.

The adjustment device 6 can also comprise at least one return pulley 13 for the metal monofilament 4 mounted to rotate with respect to the frame 10 around a rotation axis 15, the return pulley 13 being fixed in translation with respect to the frame 10. The return pulley 13 comprises a pulley sheave 17. The pulley 17 has a diameter Dr for winding the metallic monofilament 4 at least partially around the pulley 17. The diameter Dr verifies the ratio Dr > 200.d. In this case, the diameter Dr is here the diameter of the external surface of a passage slot of the monometallic filament 4 and here Dr = 100 mm.

The axis of rotation 15 and the axis of rotation 14 are parallel to each other.

The regulation device 6 also comprises means 16 for detecting at least one critical threshold of an indicator of the winding tension of the metallic monofilament 4 corresponding to a critical upper winding tension value. The regulation device 6 also comprises means 16 for detecting at least one critical threshold of an indicator of the winding tension of the metallic monofilament 4 corresponding to a lower critical winding tension value.

The critical upper winding tension value corresponds to a maximum tension to which the metallic monofilament 4 can be subjected without this representing a risk of introducing an intolerable curvature in the metallic monofilament 4. The critical lower winding tension value corresponds to a minimum tension to which the metallic monofilament 4 can be subjected without this representing a risk of fluctuation of the metallic monofilament 4.

The adjustment device 6 may comprise means 28 for guiding the adjustment pulley 12 in curvilinear translation with respect to the frame 10. These means 28 for guiding in curvilinear translation are here means for guiding in circular translation. The rotation guide means 28 may comprise a lever 30 carrying the adjustment pulley 12 . Said regulation pulley is mounted movable in rotation with respect to the lever 30. The lever is mounted movable in rotation with respect to the frame 10 about an axis 32 of rotation of the lever.

The axis of rotation 32, the axis of rotation 15 and the axis of rotation 14 are preferably parallel to each other.

The indicator of the winding tension of the metallic monofilament according to this first embodiment corresponds to the position of the adjustment pulley 12 . Therefore, it is the position of the regulating pulley 12 that will be detected by the detection means 16.

The detection means 16 comprise means for detecting at least one critical position of the regulation pulley 12 corresponding to the upper critical winding tension value and of at least one critical position of the regulation pulley 12 corresponding to a tension value of Critical underroll.

Detection means 16 may be, for example, optical sensors or magnetic sensors. Preferably, the detection means comprise a photoelectric cell. The use of optical sensors or magnetic sensors makes it possible to refine the detection of the critical threshold of an indicator of the winding tension of the monofilament, and thus allows a more precise regulation of this tension.

The winding device 8 comprises a winding coil 18 mobile in rotation about a winding axis 20 . As illustrated in Figure 5, the winding bobbin 8 comprises a bobbin hub 19 of substantially cylindrical shape having a diameter De for winding the metallic monofilament 4 around the hub 19. The diameter De verifies the ratio De > 200.d . In this case, the diameter De is here the diameter of the external surface of the hub 19 and here it is between 100 mm and 380 mm, and more preferably between 100 mm and 200 mm.

Said winding device 8 also comprises means 22 for driving the winding reel in rotation around the winding axis 20, for example, a motor.

As illustrated in Figure 1, the winding axis 20, axis 14, axis 15 and axis 32 may be parallel to each other.

The installation 2 comprises means 24 for regulating the drive means 22 . The regulation means 24 are connected to the driving means 22 and to the detection means 16. The regulation means 24 receive a signal from the detection means 16 and adjust the speed of rotation of the winding reel 18 by acting on the drive means 22.

The regulation means 24 are arranged to reduce the speed of rotation of the winding reel 18 when the indicator reaches the critical threshold corresponding to the critical upper winding tension value, and here when the regulation pulley 12 reaches the critical position corresponding to the critical upper winding tension value. Reducing the speed of rotation of the winding spool 18 allows the winding tension to be decreased.

Similarly, the regulating means 24 are arranged to increase the speed of rotation of the winding reel 18 when the indicator reaches the critical threshold corresponding to the critical lower winding tension value, and here when the regulating pulley 12 reaches the critical position corresponding to the critical lower winding tension value. Increasing the speed of rotation of the winding spool 18 allows the winding tension to be increased.

Therefore, the winding tension is controlled by acting on the winding speed of the metallic monofilament 4.

The adjustment means 24 of the drive means 22 are arranged so that the critical upper winding tension value is less than or equal to 1000 g. Said adjustment means 24 of the driving means 22 can be arranged, for example, so that the critical upper winding tension value is less than or equal to 800 g, preferably 600 g and more preferably 500 g.

Said drive means adjustment means 24 may be arranged so that the critical lower winding tension value is greater than or equal to 150 g, preferably 200 g and more preferably 300 g.

The adjustment of the upper critical and lower critical winding tension values makes it possible to limit or even eliminate the introduction of a bend in the metallic monofilament during the winding stage and to limit or even eliminate any risk of fluctuation of the metallic monofilament in the installation.

In order to maintain an adequate tension throughout the winding process of the monofilament 4, the regulation means 24 are arranged to reduce the speed of rotation of the winding spool, as long as the indicator exceeds the critical threshold corresponding to the tension value critical top winding. In this first embodiment, the adjustment means 24 are arranged to reduce the speed of rotation of the winding reel 18, as long as the adjustment pulley 12 exceeds the critical position corresponding to the upper critical winding tension value.

Similarly, the regulating means 24 is arranged to increase the speed of rotation of the winding reel whenever the indicator exceeds the critical threshold corresponding to the critical lower winding tension value. In this first embodiment, the adjustment means 24 are arranged to increase the speed of rotation of the winding spool 18, as long as the adjustment pulley 12 exceeds the critical position corresponding to a lower critical winding tension value.

According to a second embodiment illustrated in FIG. 2, the adjustment device 6 comprises means 34 for guiding the adjustment pulley 12 in rectilinear translation with respect to the frame 10.

The guide means 34 in rectilinear translation may comprise a guide slider 36 for the regulation pulley 12, the shaft 14 of the regulation pulley being mounted to move in translation on the guide slider 36.

As in the first embodiment, the indicator of the winding tension of the metallic monofilament corresponds to the position of the adjustment pulley 12. On the other hand, the movement of the adjustment pulley 12 with respect to the frame is no longer a curvilinear translation but a rectilinear translation.

The other characteristics of the adjustment pulley 12, of the return pulley 13, of the detection means 16, of the winding reel 18, of the drive means 22 and of the adjustment means 24 according to the first embodiment can be applied to this second embodiment.

According to a third embodiment illustrated in FIG. 3, the detection means 16 comprise means for measuring the winding tension 26 of the metallic monofilament 4 between the adjustment device 6 and the winding device 8 .

The tension measuring means 26 may be, for example, a tensiometer. This embodiment makes it possible to directly measure the winding tension of the metallic monofilament 4. The tension measurement means 26 can complement the detection means 16 or replace them.

Regulating means 24 are arranged to reduce the speed of rotation of the winding spool 18 when the winding tension of the metallic monofilament 4 rises above the critical upper winding tension value and arranged to increase the speed of rotation of the winding bobbin 18 when the winding tension of the metallic monofilament 4 drops below the critical lower winding tension value.

As in the previous embodiments, in order to maintain adequate tension throughout the monofilament 4 winding procedure, the regulation means 24 are arranged to reduce the speed of rotation of the winding spool whenever the indicator exceeds the corresponding critical threshold to the critical upper winding tension value. In this third embodiment, the regulation means 24 are arranged to reduce the speed of rotation of the winding spool 18, whenever the winding tension of the metallic monofilament 4 is above the critical upper winding tension value.

Similarly, the regulating means 24 is arranged to increase the speed of rotation of the winding reel whenever the indicator exceeds the critical threshold corresponding to the critical lower winding tension value. In this third embodiment, the adjustment means 24 are arranged to increase the speed of rotation of the winding spool 18, whenever the winding tension of the metallic monofilament 4 is below the critical lower winding tension value.

The guide means of the adjustment pulley 12 shown in Figure 3 are guide means 28 in curvilinear translation. However, this embodiment may alternatively comprise guide means 34 in rectilinear translation.

The adjustment means 24 are integrated into the structure of the drive means 22 and are therefore not shown in Figure 3.

The other characteristics of the adjustment pulley 12, of the return pulley 13, of the winding reel 18, of the drive means 22 and of the adjustment means 24 according to the first and second embodiments 1 and 2 are applicable to this third embodiment.

As illustrated in figure 4a, the installation 2 according to any of the previous embodiments may comprise several pulleys 12a, 12b, 12c for regulating the tension of the metallic monofilament 4 mounted movable in rotation with respect to the frame 10 about an axis common 14 for rotation of the regulation pulleys 12a, 12b, 12c.

Each adjustment pulley 12 is mounted to move in translation with respect to the frame 10 in a direction substantially perpendicular to the common axis 14 of rotation of the adjustment pulleys 12a, 12b, 12c. Each regulating pulley 12a, 12b, 12c comprises a corresponding sheave 11a, 11b, 11c. The regulation pulleys are arranged to move freely in translation with respect to the frame 10 under the effects of the tension of the monofilament 4 and the weight of the regulation pulleys 12a, 12b, 12c.

The multiplication of the adjustment pulleys makes it possible to increase the length of the path of the metallic monofilament and to reduce the winding tension applied to the metallic monofilament 4.

The regulation pulleys 12a, 12b, 12c can be mobile in rotation independently of one another. Thus, a difference in the speed of passage of the metallic monofilament 4 from one pulley to the other will not cause additional mechanical stresses in contact with the regulation pulleys 12a, 12b, 12c, in particular non-slip of the metallic monofilament 4 in the contact of the pulleys, which could cause premature wear of the sheaves 13 and poor regulation of the tension of the metallic monofilament 4.

As illustrated in figure 4b, the adjustment device can also comprise several return pulleys 13a, 13b, 13c of the metal monofilament 4 mounted movable in rotation with respect to the frame 10 around a common axis 15 of rotation of the return pulleys , each return pulley being fixed in translation with respect to the frame. Each return pulley 13a, 13b, 13c comprises a corresponding sheave 17a, 17b, 17c.

The multiplication of the return pulleys makes it possible to increase the length of the metallic monofilament run and to decrease the winding tension applied to the metallic monofilament 4.

The return pulleys 13a, 13b, 13c can be rotatable independently of one another for the same reasons as the regulating pulleys 12a, 12b, 12c.

In the above embodiments, the mass of the pulley or pulleys exerts a force opposite to that of the winding tension. Thus, the mass of the pulley or pulleys will act on the winding tension. Too high a dough can increase the tension too much.

Therefore, the mass of the regulating pulley or pulleys 12 can be less than or equal to 1500 g, preferably 800 g.

The invention also relates to a method for regulating the tension of a metallic monofilament and for winding the metallic monofilament 4 by means of an installation for regulating the tension of a metallic monofilament and for winding the metallic monofilament comprising:

- a device for regulating the tension 6 of the metallic monofilament,

- a device 8 for winding the metallic monofilament arranged downstream of the adjustment device in the direction of displacement of the metallic monofilament, the winding device comprising a winding spool 18 that is mobile in rotation about a winding axis 20,

method in which a critical threshold of a metallic monofilament winding tension indicator corresponding to a critical upper winding tension value is detected,

and wherein, when the indicator reaches the critical threshold corresponding to the critical upper winding tension value, the rotational speed of the winding spool is reduced.

During this procedure, a critical threshold of a winding tension indicator of the metallic monofilament 4 corresponding to a critical lower winding tension value is detected, and when the indicator reaches the critical threshold corresponding to the critical lower winding tension value, the speed of rotation of the winding spool 18 increases.

The winding spool rotation speed is reduced whenever the indicator exceeds the critical threshold corresponding to the critical upper winding tension value and the winding spool rotation speed is increased whenever the indicator exceeds the critical threshold corresponding to the critical lower winding tension value.

In a method that uses the installation 2 according to the first and second embodiments, at least one critical position of the regulation pulley 12 corresponding to the upper critical winding tension value is detected and at least one critical position of the pulley is detected. 12 regulation corresponding to a lower critical winding tension value.

The rotational speed of the winding spool 18 is reduced when the regulating pulley 12 reaches the critical position corresponding to the critical upper winding tension value and the rotational speed of the winding spool 18 is increased when the regulating pulley 12 reaches the critical position. reaches the critical position corresponding to a critical lower winding tension value.

In order to maintain an adequate winding tension, the rotational speed of the winding spool 18 is reduced whenever the regulation pulley 12 exceeds the critical position corresponding to the critical upper winding tension value and the rotational speed of the winding spool 18 is increased. winding coil 18 whenever the regulating pulley 12 exceeds the critical position corresponding to a lower critical winding tension value. Thus, the pulley moves between the two critical positions depending on the variations in tension of the metallic monofilament 4.

In a method using the installation 2 according to the third embodiment, the winding tension of the metallic monofilament 4 between the adjustment device 6 and the winding device 8 is measured.

Thus, the rotational speed of the winding spool 18 is reduced when the winding tension of the metallic monofilament 4 passes above the critical upper winding tension value and the rotational speed of the winding spool 18 is increased whenever the winding tension of the metallic monofilament 4 is below the critical lower winding tension value.

To maintain proper winding tension, the rotational speed of the winding spool 18 is reduced whenever the winding tension of the metal monofilament 4 is above the critical upper winding tension value and the rotational speed of the spool 4 is increased. winding bobbin 18, provided that the winding tension of the metallic monofilament 4 is below the critical lower winding tension value.

The metallic monofilament 4 used in the different embodiments described above has a diameter ranging from 0.05 to 0.50 mm, preferably from 0.10 mm to 0.45 mm, more preferably from 0.25 mm to 0. 45 mm and even more preferably from 0.28 mm to 0.40 mm. Here, d = 0.32mm. To avoid introducing an intolerable bend in such a metallic monofilament, the critical upper winding tension value is less than or equal to 1000 g, preferably 800 g, more preferably 600 g, and even more preferably 500 g, and the critical lower winding tension value is greater than or equal to 150 g, preferably 200 g, more preferably 300 g.

Example

The following example is given only as an indication and is not intended to limit the present invention.

A metal monofilament (4) is wound with the aid of a tension regulation and winding installation comprising:

- a device (6) for regulating the tension of the metallic monofilament,

- a device (8) for winding the metallic monofilament arranged downstream of the adjustment device in the direction of movement of the metallic monofilament,

comprising the regulation device (6):

- a frame (10),

- at least one pulley (12) for regulating the tension of the metallic monofilament (4) mounted movable in rotation with respect to the frame (10) around an axis (14) of rotation of the regulating pulley, the pulley (12) mounted regulation pulley movable in translation with respect to the frame (10) along a direction substantially perpendicular to the axis (14) of rotation of the regulation pulley, the regulation pulley (12) being arranged to move freely in translation with respect to the frame ( 10) under the effects of the tension of the metallic monofilament (4) and the weight of the regulating pulley,

- means (16) for detecting at least one critical threshold of an indicator of the winding tension of the metallic monofilament (4) corresponding to a critical upper winding tension value,

comprising the winding device (8):

- a winding reel (18) which is mobile in rotation about a winding axis (20), - means (22) for rotating the winding reel (18) around the winding axis (20),

the installation (2) comprising means (24) for regulating the drive means (22) connected to the drive means (22) and to the detection means (16) to reduce the speed of rotation of the coil (18) of winding when the indicator reaches the critical threshold corresponding to the critical upper winding tension value.

The winding coil has a winding diameter of 200 mm. The diameter of the sheave (13) of the regulation pulley (12) is 80 mm. Different tests are carried out. For each test, 5 samples of 600 mm are taken and the curvature is measured, that is, the sample is placed in a horizontal position, the maximum distance between the sample and a straight line that passes through the two ends of the sample, measuring the distance on a perpendicular to this straight line. The average of the 5 measurements is calculated.

For each diameter of metallic monofilament, the results are expressed in base 100, 100 corresponding to the curvature obtained on average with a steel pulley and a winding tension, typical of the state of the art, of 2500 g. A value less than 100 corresponds to a weaker curvature. The results are shown in the following table.

The invention has been described above with the help of embodiments without limitation of the general inventive concept.

Many other modifications and variations are suggested by those skilled in the art after reflection on the various embodiments illustrated in this application. These embodiments are given by way of example and are not intended to limit the scope of the invention, which is determined exclusively by the following claims.

Claims (15)

1. Installation (2) for regulating the tension of a metallic monofilament (4) and for winding the metallic monofilament (4), comprising: - a device (6) for regulating the tension of the metallic monofilament, - a device (8) for winding the metallic monofilament arranged downstream of the adjustment device in the direction of movement of the metallic monofilament, comprising the regulation device (6): - a frame (10), - at least one pulley (12) for regulating the tension of the metallic monofilament (4), mounted movable in rotation with respect to the frame (10) around an axis (14) of rotation of the regulating pulley, the pulley being mounted (12) of mobile adjustment in translation with respect to the frame (10) along a direction substantially perpendicular to the axis (14) of rotation of the adjustment pulley, the adjustment pulley (12) being arranged to move freely in translation with respect to the frame (10) under the effects of the tension of the metallic monofilament (4) and the weight of the regulating pulley, - means (16) for detecting at least one critical threshold of an indicator of the winding tension of the metallic monofilament (4) corresponding to a critical upper winding tension value, comprising the winding device (8): - a winding reel (18) mobile in rotation about a winding axis (20), - means (22) for rotating the winding reel (18) around the winding axis (20), the installation (2) comprising means (24) for regulating the drive means (22) and connected to the drive means (22) and to the detection means (16) to reduce the speed of rotation of the coil (18) of winding when the indicator reaches the critical threshold corresponding to the upper critical winding tension value, the adjustment means (24) being arranged in such a way that the upper critical winding tension value is less than or equal to 1000 g, the installation being characterized in that the or each regulation pulley (12) comprises a monolithic pulley sheave (17) made of a material with a density less than or equal to 7 g.cm-3, preferably 2 g.cm-3 . Installation (2) according to the preceding claim, in which the adjustment means (24) are arranged in such a way that the critical upper winding tension value is less than or equal to 800 g, preferably 600 g, and more. preferably 500 g. Installation (2) according to any of the preceding claims, comprising means (16) for detecting at least one critical threshold of an indicator of the winding tension of the metallic monofilament (4) corresponding to a lower winding tension value critical. Installation (2) according to any of the preceding claims, in which the detection means (16) comprise means (26) for measuring the winding tension of the metallic monofilament (4) between the regulation device (6) and the winding device (8). 5. Installation (2) according to the preceding claim, in which the regulation means (24) are arranged to reduce the speed of rotation of the winding spool (18) when the winding tension of the metallic monofilament (4) passes through above the critical upper winding tension value. Installation (2) according to any of the preceding claims, in which the detection means (16) comprise detection means for at least one critical position of the regulation pulley (12) corresponding to the upper critical winding tension value. . Installation (2) according to the preceding claim, in which the adjustment means (24) are arranged to reduce the speed of rotation of the winding reel (18) when the adjustment pulley (12) reaches the corresponding critical position to the critical upper winding tension value. 8. Installation (2) according to any of the preceding claims, in which the regulation device (6) comprises several pulleys (12a, 12b, 12c) for regulating the tension of the metallic monofilament (4) mounted mobile in rotation with respect to to the frame (10) around a common axis (14) of rotation of the regulation pulleys, each regulation pulley (12) being mounted movable in translation with respect to the frame (10) in a direction substantially perpendicular to the common axis (14) of rotation of the regulation pulleys (12a, 12b, 12c), the regulation pulleys being arranged to move freely in translation with respect to the frame (10) under the effects of monofilament tension (4) and the weight of the regulation pulleys (12a, 12b, 12c). Installation (2) according to the preceding claim, in which the regulation pulleys (12a, 12b, 12c) are mobile in rotation independently of one another. Installation (2) according to any of the preceding claims, in which the adjustment device (6) comprises at least one return pulley (13) for the metal monofilament (4) mounted to rotate with respect to the frame (10) about an axis (15) of rotation of the return pulley, the return pulley (13) being fixed in translation with respect to the frame (10). 11. Installation (2) according to the preceding claim, in which the regulation device (6) comprises several pulleys (13a, 13b, 13c) for returning the metallic monofilament (4) mounted movable in rotation with respect to the frame 10 around a common axis (15) of rotation of the return pulleys, each return pulley (13) being fixed in translation with respect to the frame (10). Installation (2) according to the preceding claim, in which the return pulleys (13a, 13b, 13c) are mobile in rotation independently of one another. Installation (2) according to any of the preceding claims, in which the mass of the regulating pulley or pulleys (12) is less than or equal to 1500 g, preferably 800 g. Installation (2) according to any of the preceding claims, in which the sheave (17) of the pulley or of each regulation pulley (12) is made of a polymeric material. 15. Method for regulating the tension of a metallic monofilament (4) and for winding the metallic monofilament (4) by means of an installation (2) for regulating the tension of a metallic monofilament (4) and for winding the metallic monofilament (4) according to one of the preceding claims, in which method a critical threshold of an indicator of the winding tension of the metallic monofilament (4) corresponding to a critical upper winding tension value is detected, and in which, when the indicator reaches the critical threshold corresponding to the critical upper winding tension value, the rotational speed of the winding spool (18) is reduced.