EP1547953B1 - Take-up and individualization device for yarns fed from a treatment machine - Google Patents

Description

The present invention relates to the field of the textile industry, in particular wire processing machines, such as steaming machines, stranding machines, or other and has for object a recovery device and individualization son coming out of a processing machine.

The processes for continuous treatment of son previously deposited on a conveyor belt or the like, such as, in particular, steaming are known. Thus, for example, in a vaporization process a wire to be treated, deposited in the form of turns on a transport means passes through a treatment chamber fed with steam or hot air. At the exit of this enclosure, the wire is cooled and then wound.

When the wire to be treated has a good mechanical strength and a large linear density, it is possible to treat several wires simultaneously, according to a process called multi-wire process. In such a case, several son to be treated are jointly deposited in the form of parallel turns on the transport means and pass through the steam chamber, then cooled and wound separately. This winding is performed by means of a winder having as many winding units as jointly deposited wires, the winding units operating synchronously.

Moreover, in the case of implementation of son of good mechanical strength, the simultaneous winding of the jointly deposited wires is made possible by the fact that a sufficient voltage can be applied downstream of the winding units, so as to ensure the separation son and thus allow to ensure a correct winding of all son. Devices implementing such methods are in particular known by US-A-3,638,873 , US-A-4,623,101 , US-A-4,574,574 , GB-A-1,214,999 and US-A-4,830,296 .

When the wires have a medium or low mechanical resistance and a low linear density, a multi-wire process is more difficult or impossible to implement, because the wire of lower mechanical strength has a greater tendency to break, which has the effect of breaks of a wire, a complete stop of the unit of treatment and thus stopping the son deposited jointly with the broken wire, thus causing a significant loss of productivity.

In addition, in the case of fragile son, this possibility of simultaneous winding jointly deposited son does not exist, because the voltage applied downstream of the winding units causes the breaking of son, thus preventing work on synchronous winder.

It follows from this observation that the processes of continuous vaporization of fine and fragile son, implemented today, generally operate on a single-line principle. In such a case, a wire to be treated is deposited on a transport means passing through a vaporization chamber and carrying the treated wire to a winding unit. Thus, sufficient productivity can only be achieved by juxtaposing a large number of processing units.

Such a single-wire method, however, has a number of disadvantages. In fact, to obtain a substantial production, it is necessary to implement a large number of processing units. However, when working with very fine threads, and because of the limitation of the working speed according to the mechanical strength of the threads, the production of such sets of single-line processing units is considerably reduced.

In addition, certain types of yarns, which are treated in the manner described above, have a tendency to form loops when the turns deposited on the means of transport leave the latter in the direction of the winding unit. As a result, these loops constituted by consecutive turns of wire disturb the efficiency and the quality of the winding.

The present invention aims to overcome these disadvantages by providing a device for recovery and individualization of son out of a processing machine for regulating the speed of son leaving a processing machine, before their subsequent processing.

For this purpose, the device according to the invention comprises the features of claim 1.

• la figure 1 est une vue partielle en perspective d'un dispositif conforme à l'invention monté en amont d'une machine à bobiner;
• la figure 2 est une vue analogue à celle de la figure 1 du dispositif seul ;
• la figure 3 est une vue en perspective, à plus grande échelle, représentant un moyen individuel de contrôle de présence des fils et de régulation de la vitesse des fils, et
• les figures 4 et 5 sont des vues en perspective représentant le fonctionnement des moyens individuels de contrôle de présence des fils et de régulation de la vitesse des fils.

The invention will be better understood, thanks to the following description, which refers to a preferred embodiment, given by way of non-limiting example, and explained with reference to the attached schematic drawings, in which:

• the figure 1 is a partial perspective view of a device according to the invention mounted upstream of a winding machine;
• the figure 2 is a view similar to that of the figure 1 the device alone;
• the figure 3 is a perspective view, on a larger scale, showing an individual means for controlling the presence of the threads and regulating the speed of the threads, and
• the Figures 4 and 5 are perspective views showing the operation of the individual means for controlling the presence of the wires and regulating the speed of the wires.

The figure 1 By way of example, the appended drawings show a device intended to be mounted at the output of a son-processing machine, such as a steaming machine, for the recovery of string wires, or the like.

According to the invention, this device essentially consists of at least one son individualization means 1, comprising individual wire guiding elements 2 and a traction recovery assembly of the individualized wires, and by at least one means 4 ', 4' individual control of presence of son and speed control son, so as to achieve on said son a soft corresponding to a path of undulating shape before their downstream processing. This device is represented, for example, with a vertical circulation of the wire 3. However, it is also possible to operate said device with son circulation horizontally.

The downstream treatment of the wires 3 may consist, for example, as shown in FIG. figure 1 of the accompanying drawings, in a straight or conical winding in a winder 5 having winding devices 6 with crenellated rollers 6 'or flies or moving eyelets (not shown). For this purpose, the winder 5 is provided, in a manner known per se, with devices 7 for guiding and pre-tensioning the wires 3 wound individually on coils 8 of said winder 5. Downstream processing may also consist of other thread processing operations individually.

According to one characteristic of the invention, the individual wire guiding elements 2 and the traction recovery assembly of the individualized wires, as well as the individual means or means 4, 4 'for controlling the presence of the wires and regulating the the speed of the son are advantageously mounted on a frame 9 for support and fixation on a downstream processing machine 5 or on an independent chassis (not shown).

The individual wire guiding elements 2 are advantageously each in the form of an eyelet mounted on an arm 2 'secured to the frame 9 and extending upstream of the traction recovery assembly of the individualized wires 3.

This traction recovery assembly of the individualized son 3 is in the form of at least one drive cylinder 10 actuated at constant speed by a motor 11 and cooperating, at each individual wire 3, with a pressure roller 12. Thus the yarns 3 coming from an upstream processing machine can be perfectly individualized by passing through the eyelets 2 which are assigned to them and then, by passing between the driving cylinder 10 and the pressing roller 12, they are pulled under tension and constant speed out of the docking devices or others provided at the output of the upstream processing machine.

The traction recovery assembly of the individualized wires 3, represented by way of example in figures 1 , 2 , 4 and 5 , However, it is obvious that such an assembly can extend over a large width and be provided with a large number of pressure rollers 12 corresponding to a number of equivalent of individual threads 3 of a web of threads from a processing machine.

The individual means 4, 4 'for controlling the presence of the wires 3 and for regulating the speed of said wires 3 consist essentially of pairs of sensors 4, 4' mounted on the support frame 9 and each assigned to a wire 3, individualized. through the resumption of son assembly 3, these pairs of sensors being each disposed downstream of a pressing roller 12 for feeding the corresponding wire 3 and cooperating with an electronic device (not shown) for controlling and regulation of the means 6-6 'for pulling the threads 3 of a downstream processing machine 5. The sensors forming the individual means 4, 4' each comprise a photoelectric or optical cell 41, 41 'whose axis of detection extends in a recess 42, 42 'of said sensor.

According to a feature of the invention, one, 4, sensors is disposed near the drive roller 10 and the pressure roller 12, downstream thereof, and the axis of its cell 41 perpendicularly crosses the trajectory wire 3 at the exit of said drive roller 10 and pressure roller 12, while the other sensor 4 'is disposed at a distance from the first sensor 4 and with an offset with respect to the rectilinear trajectory of the wire upstream thereof ci, this other sensor 4 'being provided with an eyelet 13 for guiding the wire 3, extending after said sensor 4' and the cell 41 'and mounted on said sensor 4' via a support 14 ( Figures 1 to 5 ). The thread 3 coming from the thread take-up assembly 3 is then conveyed, after the sensor 4 ', to a downstream processing machine and is guided by means of one or more eyelets 15 ( figure 1 ). As a result of this offset mounting of the sensors 4 and 4 ', the wire 3 tends to extend obliquely between the sensor 4' and the drive rollers 10 and the presser 12 ( figure 4 and 5 ), when the wire 3 receives a certain tension between these two elements.

In the embodiment shown at figure 1 In the accompanying drawings, the downstream processing machine 5 is a winder and the means 6-6 'for pulling the threads 3 are winding devices 6 with crenellated rollers 6'.

According to another characteristic of the invention, the electronic device for controlling and regulating means 6-6 'for pulling the threads 3 of a downstream processing machine 5 can advantageously be constituted in the form of a programmable controller integrating a detecting the presence of wires at the cells 41, 41 'of the sensors 4, 4' and the speed of the wire 3 at the means 6-6 'of pulling the wires 3 of the downstream processing machine 5.

As shown more particularly by Figures 1 to 5 In the accompanying drawings, the device according to the invention operates as follows:

The yarns 3, coming from an upstream processing machine, are threaded into the eyelets 2 forming the individual yarn guiding elements 3 and each placed between a pressure roller 12 and the driving cylinder 10, actuated by the motor 11. 3. Each wire then passes into the corresponding recess 42 of the sensor 4, then is inserted into the eyelet 13 of the corresponding sensor 4 'and then into an eyelet 15 of a processing machine downstream 5 to be brought into it, through a device 7 for guiding and pre-tensioning means 6-6 'traction.

During this operation, at the exit of the traction recovery assembly of the individualized wires 3, the latter are projected in the direction of the axis passing through the point of contact between the drive roller 10 and the pressure rollers 12. The positional offset between the preceding axis and the axis passing through the center of the outlet eyelet 13 of the device allows the wire 3 to take, at a given instant, a path of undulating shape between these two points, if the speed of the traction means 6-6 'is less than the speed of the traction recovery assembly, a straight trajectory between these two points, if the speed of the traction means 6-6' is greater than or equal to the speed of the traction recovery assembly. The cell 41 of the sensor 4 extending immediately downstream of the drive rollers 10 and presser 12 and the cell 41 'of the sensor 4' extending immediately before the eyelet 13 can detect the presence of a slack on the wire 3 corresponding to a path of undulating shape of the wire. Such slack is particularly necessary in the presence of very thin and very fragile son having to undergo a very limited tension.

If the downstream processing machine 5, by its means 6-6 'of pulling the threads 3, pulls too fast a thread 3, as shown, for example, to figures 2 , 4 and 5 for the right-hand thread, for the left-hand thread and for the two threads, respectively, the electronic control and regulation device cooperating with the sensors 4, 4 'forming the individual means for controlling the presence of the wires 3 and of the regulation the speed of said son 3, delivers a speed regulation signal of said means 6, 6 'tending to lower the speed of traction of the latter so that the wire 3 takes a path of undulating shape between the sensors 4 and 4 ', this path extending through one of its strands in the recess 42' of the sensor 4 '. Indeed, when the wire 3 is too tight, its two strands are both released from the recesses 42 and 42 'of the sensors 4, 4' and stretched, as indicated above, so that the presence of a strand of wire 3 is no longer detected by cells 41 and 41 '.

After regulating the speed of the means 6, 6 ', in the direction of a lowering thereof, the wire 3 brought to constant speed by the recovery assembly of the device according to the invention forms an undulating trajectory whose strands are detected by both sensors 4 and 4 '. As soon as the two strands of an undulating trajectory of a wire 3 are detected, the electronic control device delivers a slowdown signal allowing traction of the wire at a stabilized speed substantially corresponding to that of supplying said wire to the sensors 4, 4 '. As a result, an extreme thread tension situation, such as that represented by the left thread of the figure 5 , following which the wire could break, can be completely avoided by the device according to the invention.

According to an alternative embodiment of the invention, it is also possible to replace the sensors 4 and 4 'forming the individual means for controlling the presence of the son 3 by a single multi-zone sensor detecting different positions of the wire 3, that is to say say at least one corresponding to the undulating form and one corresponding to a voltage of the wire 3. Such a sensor may, for example, be constituted by a multipositions detector simultaneously scanning several zones or by a Doppler-type radar detector.

The electronic control device also makes it possible to take into account the differential speed of traction that can be experienced by the wire 3, for example, in the case of a winding on a conical coil ( figure 1 ), as well as swirling during winding. In such cases, the winding speed undergoes variations causing more or less traction on the wire 3. These variations in traction speed can be taken into account by the device according to the invention.

Thanks to the invention, it is possible to provide a device for recovery and individualization son out of a processing machine for perfect separation of several son simultaneously processed upstream and their individual recovery constant voltage. This is particularly interesting in the case of recovery of very fine and fragile son.

On the other hand, in the case of thin and fragile wires treated in a multi-ply in a steaming machine, the problem of the loops occurring during the steaming can be solved to a large extent. Indeed, when fine and fragile yarn is treated by steaming, loops deposited for steaming tend, despite the treatment, to maintain some elasticity that may cause the formation of knots following traction on the wire. Due to a multi-wire treatment made possible by the device according to the invention, the loops deposited for vaporization have a greater pitch, namely at least two or even three or more, due to an alternation of turns from several wires, which causes a natural ability of said wires to separate, so that their tendency to reform a loop or a node is considerably lessened.

As a result, the device according to the invention makes it possible to increase the productivity of the upstream processing unit.

Of course, the invention is not limited to the embodiment described and shown in the accompanying drawings. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of the invention as defined by the claims.

Claims (9)

1. A device, designed to be mounted at the output end of a yarn processing machine, such as a steaming machine, a machine for taking up yarns from beams, or the like, consisting essentially of at least one means for separating the yarns, comprising individual elements (2) for guiding the yarn (3) and an assembly for taking up by traction the separated yarns, characterised in that it comprises at least one individual means (4, 4') for controlling the presence of yarns and regulating the speed of yarns, which are guided with a shift in position in relation to their rectilinear trajectory upstream of said individual means (4, 4') for controlling the presence of yarns and regulating the speed of yarns, by means of guiding eyelets (2 and 13), so as to achieve on said yarns an easing corresponding to a trajectory with an undulating form prior to their processing downstream.
2. The device according to claim 1, characterised in that the individual elements (2) for guiding the yarn (3) and the assembly for taking up by traction the separated yarns, as well as the individual means (4, 4') for controlling the presence of the yarns and regulating the speed of the yarns are mounted on a frame (9) for supporting and securing onto a machine for processing downstream (5) or an independent frame.
3. The device according to claim 2, characterised in that the individual elements (2) for guiding the yarn (3) are each in the form of an eyelet mounted on an arm (2') fixed to the frame (9) and extending upstream of the assembly for taking up by traction the separated yarns (3).
4. The device according to claim 1, characterised in that the assembly for taking up by traction the separated yarns (3) is in the form of at least one drive cylinder (10) driven at constant speed by a motor (11) and cooperating at the level of each individual yarn (3) with a press cylinder (12).
5. The device according to any one of claims 2 and 4, characterised in that the individual means (4, 4') for controlling the presence of yarns (3) and regulating the speed of said yarns (3) consist essentially of pairs of sensors (4, 4') mounted on the support frame (9) and each assigned to a yarn (3), separated by means of the assembly for taking up yarns (3), said pairs of sensors being each arranged downstream of a press cylinder (12) for supplying the corresponding yarn (3) and cooperating with an electronic device for controlling and regulating the traction means (6-6') of yarns (3) of a processing machine downstream (5).
6. The device according to claim 5, characterised in that the sensors forming the individual means (4, 4') each comprise a photoelectric or optical cell (41, 41') the detection axis of which extends into a recess (42, 42') of said sensor.
7. Device according to claim 6, characterised in that one (4) of the sensors is arranged close to the forwarding roller (10) and the press cylinder (12) downstream of the latter, and the axis of its cell (41) cuts perpendicularly the trajectory of the yarn (3) at the output side of said forwarding roller (10) and press cylinder (12), whereas the other sensor (4') is arranged at a distance from the first sensor (4) and with a shift in relation to the rectilinear trajectory of the yarn upstream of the latter, said other sensor (4') being provided with an eyelet (13) for guiding the yarn (3), extending after said sensor (4') and the cell (41') and mounted on said sensor (4') by means of a support (14).
8. Device according to any one of claims 6 and 7, characterised in that the electronic device for controlling and regulating the traction means (6-6') of the yarns (3') of a machine for processing downstream (5) is in the form of a programmable controller integrating the detection of the presence of yarns at the level of the cells (41, 41') of the sensors (4, 4') and the speed of the yarn (3) at the level of the traction means (6-6') of the yarns (3) of the processing machine downstream (5).
9. Device according to claim 1, characterised in that it comprises an individual means for controlling the presence of yarns (3) in the form of a single multizone sensor detecting different positions of the yarn (3), that is at least the one corresponding to the undulating shape and the one corresponding to the tension of the yarn (3).

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