EP1942218A2 - Device for accumulation of yarns - Google Patents

Abstract

The device has a receiving and guiding chute receiving and guiding a strand that is formed by a filament yarn receiving device (10) and a reception carriage (14) of a stubbling-roll of yarns that is parallely guided at a longitudinal axis of the chute provided with a tensioning device. The stubbling-roll of yarns is supported on an end of the strand in a side opposite to the device (10). The carriage has a controlling and supporting unit (16) that controls its displacement and supports the carriage on the end of the strand in the side opposite to the device (10).

Description

The present relates to the field of the textile industry, in particular the treatment of yarns, in particular by means of heat treatment machines commonly called heat-setting machines, as well as other processing or manufacturing lines, in which the yarn is transported. between different processing stations, in which the running speeds may be different, and relates to a son accumulation device.

The yarn processing machines used in the field of the textile industry are often arranged in line to allow different treatments of textile yarns continuously and thus a high yield resulting from a minimum number of interruptions in the manufacturing process. or treatment, for example because of the change in the running speed of the threads in a machine compared to previous and / or subsequent machines, or even because of the total necessary stoppage of a machine, for example a winder for the replacement of the full coils.

It is therefore necessary to provide intermediate storage of the son to compensate for the speed differential that can exist between two son processing stations, to allow smooth operation of a manufacturing line and / or treatment.

For this purpose, we know, for FR-A-2,576,885 an accumulator device for textile threads using a thread take-up device in turns on the end of a longitudinal support and means for taking up said threads at the other end of this support.

Such a device makes it possible to achieve a correct accumulation of the wires, but is not adapted to modern processing and / or manufacturing lines, whose very high operating speeds require a large accumulation capacity to take account of programmed cyclic interruptions. or to allow a smooth stop of the line, that is to say without significant consequences requiring a very long restart in case of an accidental failure of a workstation.

To obviate this drawback, it has been proposed to provide an accumulator device consisting essentially of a chute arranged in extension of the output of a thread take-up device of a bead of stranded wire, the end opposite the wire recovery device is guided to be taken up and unwound by a processing station or downstream manufacturing, said chute having an inclination upwards from the son recovery device to its opposite end.

In order to regulate the speed and tension of the strand during unwinding, the chute is equipped with a carriage guided on said chute and resting on the end of the strand on the opposite side to the thread take-up device, this carriage being provided with means for guiding the strand in the form of a guide eyelet and / or a guide and return bar. In addition, this truck can be weighted in order to achieve a support force on the strand head, at the output of the wire strand, essentially to brake and control the strand during unwinding, that is to say say to allow some tension of the wire bead, as well as to obtain a predetermined density of the strand.

Devices of this type allow, because of their constitution, an easy adaptation to the working conditions, that is to say that if a large accumulation is to achieve, simply extend the chute accordingly.

However, the accumulation devices of this type have the disadvantage of always having to be more or less inclined relative to the horizontal, to allow an effective action of the weighted truck on the wire strand in formation and to ensure a correct tension wire bundle at the output of said carriage. In addition, given this inclination of the chute, the size of these devices in height can become important, as the elongation of the chute, and it becomes necessary to provide for the operator means of access in height extending over several levels, gateways type or others. This results in high installation costs.

In addition, the son strand moves in the chute by sliding in it and, from a certain length and depending on the wire, the friction effect thus produced on the wall of the chute becomes important, this which causes, in combination with the action of the carriage, an increase in the density of the strand.

This results in an impossibility of forming a homogeneous accumulation and a difficulty in taking up the thread bead, so that the proper operation of the treatment line can be affected. However, with the increase in the performance of the current processing lines, the resumption speed of the son proportionally increases and the adjustment of the resumption voltage is difficult to achieve and requires a too long time because the operator, to intervene on this adjustment, must move on the service gateway of the chute and set up a mass of ballast on the cart. Consequently, the reaction time between the observation of a bad separation and the moment of the intervention tending to modify the load parameters by means of the carriage is too long and the action carried out may be unsuitable.

In addition, the current increase in speeds causes a critical disadvantage for the safety of the operator. Indeed, because of the tension of the son, a break in the separation zone of the latter may result in the formation of a lasso-shaped loop that can cling to the carriage, which can then be brutally dragged to the same speed as the wires and being ejected from the chute without the automatic safety devices being able to react.

The present invention aims to overcome these disadvantages by providing a son accumulation device, whose height space is reduced and which ensures a homogeneous accumulation of a strand son son and easy recovery of said boudin son.

For this purpose, the wire accumulation device, which essentially consists of a chute for receiving and guiding a strand formed by a son recovery device and a carriage for taking up a son of a flange, guided parallel to the longitudinal axis of said chute and resting on the end of the strand on the opposite side to the son recovery device, is characterized in that the carriage of recovery of a son of flange guided on the chute is provided a means for controlling its displacement and the support on the end of the strand on the opposite side to the son recovery device.

• la figure 1 est une vue en élévation latérale d'une ligne de traitement de fils comportant le dispositif d'accumulation de fils conforme à l'invention ;
• la figure 2 est une vue en élévation latérale, à plus grande échelle, représentant le dispositif conforme à l'invention en prolongement d'un dispositif de reprise de fils ;
• la figure 3 est une vue partielle agrandie de la figure 2, le dispositif étant en position horizontale ;
• la figure 4 est une vue schématique en élévation latérale d'un moyen de contrôle du déplacement du chariot ;
• la figure 5 est une vue analogue à celle de la figure 4 d'une variante de réalisation du moyen de contrôle de déplacement du chariot ;
• la figure 6 est une vue analogue à celle de la figure 4 d'une autre variante de réalisation du moyen de contrôle de déplacement du chariot ;
• la figure 7 est une vue analogue à celles des figures 5 et 6 d'une troisième variante de réalisation du moyen de contrôle de déplacement du chariot;
• la figure 8 est une vue analogue à celles des figures 5 à 7 représentant une quatrième variante de réalisation du moyen de contrôle de déplacement du chariot, et
• la figure 9 est une vue analogue à celles des figures 5 à 8 représentant une quatrième variante de réalisation du moyen de contrôle de déplacement du chariot.

The invention will be better understood, thanks to the following description, which refers to preferred embodiments, given by way of non-limiting examples, and explained with reference to the appended diagrammatic drawings, in which:

• the figure 1 is a side elevational view of a son processing line having the wire accumulation device according to the invention;
• the figure 2 is a side elevational view, on a larger scale, showing the device according to the invention in extension of a son recovery device;
• the figure 3 is an enlarged partial view of the figure 2 the device being in a horizontal position;
• the figure 4 is a schematic side elevational view of a means for controlling the movement of the carriage;
• the figure 5 is a view similar to that of the figure 4 an alternative embodiment of the carriage displacement control means;
• the figure 6 is a view similar to that of the figure 4 another alternative embodiment of the carriage displacement control means;
• the figure 7 is a view similar to those of Figures 5 and 6 a third embodiment of the carriage displacement control means;
• the figure 8 is a view similar to those of Figures 5 to 7 representing a fourth variant embodiment of the means for controlling the displacement of the carriage, and
• the figure 9 is a view similar to those of Figures 5 to 8 representing a fourth variant embodiment of the carriage movement control means.

The figure 1 By way of example, the attached drawings represent a heat-setting line consisting of a creel 1, a head or a curling machine 2, for depositing threads on a conveyor belt, by a steaming unit 3, by a device a cooling head 4 extended by a sealing head 5 of a thermofixation tunnel 6, provided at its other end with an outlet sealing head 7 opening into a dryer 8, which is extended by a cooling device 9.

At the output of this device, the son are taken over continuously by a son of recovery device 10 to be routed to a winder 12. Because the winder 12 operates discontinuously to allow the lifting of full coils and the implementation in place of new windings, the treatment line is provided, between the son recovery device 10 and the winder 12 of a son accumulation device 11.

Such a device 11, which consists essentially of a chute 13 for receiving and guiding a strand formed by the son of the recovery device 10 and a carriage 14 for taking up a son of a flange, guided on said trough 13 provided with a loading device 15 and resting on the end of the strand on the opposite side to the thread take-up device 10, makes it possible to improve the efficiency of the treatment line and to ensure a preservation of delicate yarns which must remain in the heat-setting tunnel 6 only for a limited time. It is thus possible, at each stop of the winder during the lifting cycles, or following a breakage of son or a trigger of the bumper, so after the recovery of son, that the thermofixation line continues to operate normally, it that is to say without interruption, the accumulation device 11 providing a temporary storage of the wire produced, that is to say, acting as a buffer.

In accordance with the invention, the carriage 14 for taking up a wire bead, guided parallel to the longitudinal axis of the chute 13, is provided with a means 16 for controlling its displacement and for bearing on the end of the strand on the opposite side to the stripper 10.

Such a means 16 for controlling the movement and support of the carriage 14 for taking up the strand of wires on the end of the strand on the side opposite to the stripper device 10 may consist of a traction means acting on the carriage 14 taking up the strand of threads on its side turned towards the thread take-up device 10 ( Figures 3 to 6 ).

The figure 4 of the accompanying drawings represents a preferred embodiment of such a traction means constituted by a traction cable 17 mounted on a pair of muffles 18, 18 ', the movable muffle 18' is connected to a device 19 for actuating translation. Thus, the end of the carriage 14 turned towards the thread take-up device 10 is connected to one end of the traction cable 17 which is mounted on the pair of mittens 18, 18 'and the movable muffle 18' cooperates with the device 19 actuating in translation, so that any displacement of the carriage of recovery son 14 will have the effect of exerting traction on the movable muffle 18 'connected to the actuating device 19.

This actuating device 19 is intended to control the displacement of the carriage 14 and thus to brake said carriage 14 during this movement, in order to ensure a speed of progression of the carriage 14 adapted to the formation speed of the son strand. For this purpose, the actuating device 19 is constituted by a traction jack acting on the movable muffle 18 'by means of a return pulley 19' mounted on its piston rod and cooperating with a cable 20 connected by an end to said movable muffle 18 'and at its other end to a fixed point provided on the infrastructure of the chute 13.

Thus, during a unwinding of a son strand on the chute 13, the carriage 14 is subjected to a load under the effect of the pressure exerted by said strand son and is pushed in the opposite direction to the recovery device of son 10. It follows a traction on the cable 17 mounted on the mittens 18, 18 ', which has the effect of transmitting a corresponding traction on the cable 20, guided on the pulley 19' of the cylinder constituting the device However, as the cable 20 is connected at its other end to a fixed point of the infrastructure of the trough 13, there is no possibility of elongation of the latter and the movement of the movable muffle 18 'is possible only in correspondence with a displacement of the cylinder forming the actuating means 19.

For this purpose, the jack is advantageously controlled by means of an automatism, not shown and known per se, this automatism delivering, according to data corresponding to a maximum allowed pressure on the end of the strand guided in the chute 13 , a compensation signal of the corresponding pressure in the cylinder, allowing a proportional displacement of its piston rod and therefore of the return pulley 19 '. Such an automatism operates in relation to displacement pressure sensors and limit switches also known and does not require any particular description, not being an essential element of the present invention. The displacement of the return pulley 19 'results in a displacement of the movable muffle 18' releasing a corresponding length of cable 17.

The length of cable available for moving the carriage 14 on the chute 13 can easily be adjusted by maintaining an acceptable stroke of the cylinder forming the actuating device 19 by predicting a sufficient number of return pulleys on the mounts 18, 18 . Indeed, the available length of cable 20 for a given length of space of a pair of mittens and a predetermined displacement of the carriage 14 is a function of the number of cable strands mounted on the pulleys of said mittens. In addition, a large number of pulleys allows the use of a cylinder of a relatively low power and a size also limited in length.

It is also possible, according to an alternative embodiment of the invention, not shown in the accompanying drawings, to replace the jack forming the actuating device 19 by a ballast acting on the deflection pulley 19 ', by a geared motor, by a linear jack or by a magnetic coupling.

According to another embodiment of the invention and as shown in FIG. figure 5 of the accompanying drawings, the means 16 for controlling the movement and support of the carriage 14 for taking up a son of a bead on the end of the strand on the opposite side of the son recovery device 10 can simply be constituted by a cable 21 acting on the carriage 14 for taking up the wire strand on its side turned towards the son of the recovery device 10, this cable 21 being connected to a ballast 22. Such an embodiment allows a particularly simple execution of the means 16 of the control of displacement and support of the carriage 14, the bearing force of the latter against the strand formed by the winding of the son of the bead being simply predetermined by the weight calculation of the ballast 22.

To take into account the friction occurring during a large accumulation of son in the chute 13, that is to say when the coil reaches a significant length, it can be expected to influence the force developed by the ballast, for example by guiding the latter on a slope, the inclination of which can be varied continuously via a controlled cylinder (not shown).

According to another variant embodiment of the invention, represented in FIG. figure 6 appended drawings, the means 16 for controlling the displacement and support of the carriage 14 for taking up a son of a bead on the end of the strand on the opposite side to the son recovery device 10 may also be constituted by a linear jack with magnetic coupling 23 connected to the carriage 14 and controlled by means of a pneumatic piloting device 24 connected to a control and control automaton, not shown, taking into account the pressing force exerted on the end of the strand by the trolley 14.

The figure 7 of the accompanying drawings represents a third variant embodiment of the invention, in which the means 16 for controlling the movement and support of the carriage 14 for taking up a thread bead on the end of the strand, on the side opposite to the device 10, is constituted by a geared motor drive device 25 acting on a chain, a cable, a toothed belt or the like 26, whose ends are connected to the carriage 14. Thus, it is possible to perfectly control the moving the carriage 14 by driving the geared motor 25 according to the accumulation of the strand in front of the carriage 14 and the pressure exerted on the latter.

In this case, the geared motor drive device 25 can be used both as a braking device of the carriage 14 at the beginning of the formation of the strand and as a drive device of the carriage 14 in the presence of a large strand. length or when decreasing the length of the strand.

In the embodiment shown at figure 8 In the accompanying drawings, the means 16 for controlling the displacement and bearing of the carriage 14 for taking up a son of a bead on the end of the strand, on the opposite side to the thread taking-up device 10, consists of a jack screw 27, the nut 28 is secured to the carriage 14 and the screw 27 'is driven by a motor 29 controlled by a servo-variator 30. This servo-variator 30 can be connected to a device control 31 taking into account the information of a torque control means 32 connected to the servomotor 29 and data from a control and control automation not shown. Thus, it is possible, according to the maximum pressure allowed on the head of the carriage 14 facing the strand, to actuate the screw 27 'in the direction of an increase or a decrease in the pressure exerted on the strand to move the carriage 14 accordingly.

According to an alternative embodiment of the means 16 according to the figure 8 , not shown in the accompanying drawings, said means 16 for controlling the displacement and support of the carriage 14 for taking up a son of a bead on the end of the strand, on the opposite side to the son recovery device 10, may consist of by a screw jack, whose nut is driven by a motor secured to the carriage and controlled by means of a servo-variator and whose screw is secured to the frame of the chute 13.

It is also possible, according to another embodiment of the invention, not shown in the accompanying drawings, to replace the screw jack 27 with a wheel and rack assembly, whose rack is mounted on the frame of the chute 13 and whose the wheel, which meshes with the rack, is driven by a motor or a geared motor assembly mounted on the carriage 14. In such a case, the motor or the geared motor unit can invariably be used as a braking device of the carriage 14 at the beginning formation of the strand and as a drive device of the carriage 14 in the presence of a long strand or during the decrease of the length of the strand

The figure 9 appended drawings represents a fourth variant embodiment of the invention, in which the means 16 for controlling the movement and support of the carriage 14 for taking up a thread bead on the end of the strand, on the side opposite to the son recovery device 10, is constituted by a geared motor assembly 33 mounted on the carriage 14 and cooperating with a cable 34, a chain or a belt fixed at its two ends on the support frame of the chute 13. Thus, the carriage 14 can be moved on the chute 13, in one direction or the other, by simply pulling on the cable 34, the chain or the belt, through the geared motor assembly 33.

Thanks to the invention, it is possible to very significantly improve the accumulation of son in a processing line or manufacturing by allowing the realization of a homogeneous strand and easy recovery of said son strand forming said strand, this to means of a device, whose overall height can be reduced.

Indeed, by the very fact of controlling the displacement of the carriage 14 for taking up the strand of wires on the end of the strand, the guide trough of said strand can be arranged horizontally, so that its overall height is constant, and can therefore be reduced to a minimum, so as to allow the operator to intervene on the device from a uniform surface, regardless of the capacity of accumulation of the device. The control of the displacement of the carriage 14 can even allow a negative inclination of the chute 13.

In addition, the work of the operator is facilitated, because it is no longer necessary to manually intervene on the carriage 14 to adjust the separation tension of the son, the latter being continuously monitored and adjusted by the intermediate of the control automation of the displacement of the carriage 14.

Finally, the possible variations in the sampling speed of the wires of the strand accumulated in front of the carriage 14, which have the effect of corresponding variations in the length of said strand, are instantly compensated by a corresponding displacement of the carriage 14, so that its force of application on the end of the strand remains constant. It follows that the strand of son accumulated strand perfectly plays its role of buffer and optimizes the performance of a treatment line and equipped.

Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications remain possible, especially from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims (15)

Wire accumulation device consisting essentially of a chute (13) for receiving and guiding a strand formed by a thread take-up device (10) and by a strand pick-up trolley (14) , guided parallel to the longitudinal axis of said chute (13) provided with a setting device (15) and resting on the end of the strand on the opposite side to the thread take-up device (10), characterized in that that the carriage (14) for taking up a wire bead guided parallel to the longitudinal axis of the chute (13) is provided with a means (16) for controlling its displacement and the bearing on the end of the strand on the opposite side to the stripper (10). Device according to claim 1, characterized in that the means (16) for controlling the movement and support of the carriage (14) for taking up the wire bead on the end of the strand on the side opposite to the son pick-up device. (10) is constituted by a traction means acting on the carriage (14) for taking up the wire bead on its side facing the thread take-up device (10). Device according to claim 2, characterized in that the means (16) for controlling the displacement and of the support of the carriage (14) for taking up the strand of threads on the end of the strand on the side opposite to the thread take-up device. (10) is constituted by a traction cable (17) mounted on a pair of muffles (18, 18 '), the movable muffle (18') is connected to a device (19) for actuating in translation. Device according to claim 3, characterized in that the actuating device (19) is constituted by a traction cylinder acting on the movable muffle (18 ') via a return pulley (19') mounted on its piston rod and cooperating with a cable (20) connected at one end to said movable muffle (18 ') and at its other end to a fixed point provided on the infrastructure of the chute (13). Device according to claim 4, characterized in that the jack constituting the actuating device (19) is controlled by means of an automatism delivering, according to data corresponding to a maximum authorized pressure on the end of the strand. guided in the chute (13), a pressure compensation signal corresponding in the cylinder, allowing a proportional displacement of its piston rod and therefore of the return pulley (19 '). Device according to any one of Claims 4 and 5, characterized in that the jack constituting the actuating device (19) is replaced by a ballast acting on the return pulley (19 '), by a geared motor, by a linear actuator or by magnetic coupling. Device according to claim 1, characterized in that the means (16) for controlling the displacement and of the support of the carriage (14) for taking up a thread bead on the end of the strand on the side opposite to the recovery device thread (10) is constituted by a cable (21) acting on the carriage (14) for taking up the wire bead on its side facing the thread take-up device (10), this cable (21) being connected to a cable ballast (22). Device according to claim 7, characterized in that the ballast (22) is guided on a slope, the inclination of which can be continuously varied by means of a controlled cylinder. Device according to claim 1, characterized in that the means (16) for controlling the displacement and of the support of the carriage (14) for taking up a thread bead on the end of the strand on the side opposite to the recovery device of wires (10) is constituted by a linear magnetic coupling cylinder (23) connected to the carriage (14) and controlled by means of a pneumatic control device (24) connected to a control and control automaton, no shown, taking into account the pressing force exerted on the end of the strand by the carriage (14). Device according to claim 1, characterized in that the means (16) for controlling the displacement and of the support of the carriage (14) for taking up a son of thread on the end of the strand, on the opposite side to the device of son recovery (10), is constituted by a geared motor drive device (25) acting on a chain, a cable, a toothed belt or the like (26), the ends of which are connected to the carriage (14). Device according to claim 1, characterized in that the means (16) for controlling the displacement and of the support of the carriage (14) for taking up a son of thread on the end of the strand, on the opposite side to the device of son recovery (10), is constituted by a screw jack (27), whose nut (28) is secured to the carriage (14) and whose screw (27 ') is driven by a motor (29) piloted via a servo drive (30). Device according to claim 11, characterized in that the servo drive (30) is connected to a control device (31) taking into account the information of a torque control means (32) connected to the servomotor (29) and data from a control and control automation. Device according to claim 1, characterized in that the means (16) for controlling the displacement and of the support of the carriage (14) for taking up a son of thread on the end of the strand, on the opposite side to the device of son recovery (10), is constituted by a screw jack, the nut is driven by a motor secured to the carriage and controlled by means of a servo-variator and whose screw is secured to the chassis of the chute 13. Device according to claim 11, characterized in that the screw jack (27) is replaced by a wheel and rack assembly, the rack of which is mounted on the frame of the chute (13) and whose wheel, which meshes with the rack, is driven by a motor or a geared motor assembly attached to the carriage (14). Device according to claim 1, characterized in that the means (16) for controlling the displacement and of the support of the carriage (14) for taking up a son of thread on the end of the strand, on the opposite side to the device of son recovery (10), is constituted by a geared motor assembly (33) mounted on the carriage (14) and cooperating with a cable (34), a chain or a belt attached at both ends on the support frame of the chute (13).

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