EP0142486B1 - Device for controlling and piecing the broken yarn during the doffing step in a spinning machine - Google Patents

Description

The present invention relates to so-called “continuous spinning” looms and relates to a device for checking and re-priming the cut wire when replacing the full spools located on the spindles of a continuous spinning loom with empty tubes. , comprising means for sub-winding the last turns of wire, for cutting these last turns of wire and for retaining on the spindle the end of the wire coming from the slider in order to allow the start of the next winding.

• - une broche verticale en rotation sur laquelle est enfilé un tube de carton ou de plastique sur lequel le fil est enroulé;
• - un anneau sur lequel glisse un curseur et qui se déplace le long du tube dans un mouvement de va-et-vient pour répartir les spires de fil sur toute la longueur du tube.

Since the operation of the continuous spinning machine is considered to be known, any so-called “continuous spinning machine” comprises a series of elements each comprising:

• - a vertical spindle in rotation on which is threaded a cardboard or plastic tube on which the wire is wound;
• - a ring on which a cursor slides and which moves along the tube in a back and forth movement to distribute the turns of wire over the entire length of the tube.

The wire, coming from the delivery cylinders, passes through the cursor and is wound on the tube.

When the tube is sufficiently covered with wire, a coil is obtained which must be removed from the pin then stopped and placed on a skewer provided for this purpose or in a cart. We must then place another tube on the spindle to form another coil.

The removal of the spool and the placement of the tube were first done manually.

Then automatic devices appeared in order to reduce handling times and avoid heavy and repetitive work. Such a device is known from document DE-A-1 760 458 in which two grooves are provided for sub-winding which each receive a series of turns of wire. The wire present in the upper groove is cut before immobilization of the pins and the wire present in the lower groove is cut after the change of the full spool by an empty tube, during restarting and when the spindle has reached a certain speed.

The present invention aims in principle to simplify and improve the automation of operations during the replacement of full coils by empty tubes on a machine comprising a certain number of spindles.

• - la bobine pleine se trouve verticalement sur la broche;
• - un tube vide se trouve verticalement sur une brochette pour tube de remplacement, cette brochette se trouvant elle-même à une certaine distance devant la broche, éventuellement légèrement dans une position décalée par rapport à celle-ci, donc en fait entre la broche considérée et la broche suivante.

When the coils are finished, the situation is as follows:

• - the full coil is vertically on the spindle;
• - an empty tube is located vertically on a skewer for replacement tube, this skewer itself being at a certain distance in front of the spindle, possibly slightly in a position offset relative to the latter, therefore in fact between the spindle considered and the next pin.

In practice, the problem of the invention is to ensure, during the replacement mentioned above, effective control of the wire so that the winding process can automatically restart on the empty tube.

This implementation requires various manipulations including the removal of the coil and the placement of the empty tube. These operations in themselves are not part of the invention.

• - la coupure du fil
• - le contrôle du fil.

The present invention especially relates to the following operations:

• - wire cutting
• - wire control.

When the spool is finished, the ring on which the cursor slides descends and the last turns of wire are wound at the bottom of the spool. When the coil is to be removed without manual intervention, the latter turns are wound on a special sub-winding means placed under the base of the coil tube.

The resistance of the wire being often such that it takes an exaggerated effort to break it, it is then necessary to cut it positively.

• - l'une provient de la bobine pleine et est évacuée avec celle-ci;
• - l'autre vient du curseur et doit être maintenue solidaire de la broche, de façon à permettre le réamorçage du bobinage lorsque la bobine pleine aura été remplacée par un tube vide. En effet, il faut que cette extrémité soit entraînée par la broche lors de la remise en marche de celle-ci, afin que le curseur soit à nouveau entraîné par le fil tendu et que le processus de bobinage puisse démarrer à nouveau.

The wire being cut, we are in the presence of two ends of wire:

• - one comes from the full reel and is evacuated with it;
• - the other comes from the cursor and must be kept integral with the spindle, so as to allow the re-ignition of the winding when the full reel has been replaced by an empty tube. Indeed, it is necessary that this end is driven by the spindle when it is restarted, so that the cursor is again driven by the tensioned wire and that the winding process can start again.

In the manual process, this end of the wire is trapped by the worker between the spindle and the empty tube.

The device used to hold this wire without the intervention of the worker is part of the invention.

With a view to achieving these aims, the invention essentially consists in providing a device consisting of two rings, one inside and the other outside, each ring comprising one or more knife blades, the outer ring can slide from top to bottom and bottom to top on the inner ring so that the two blades come into contact with the last turns of wire wound between these blades and shear them.

• - les figures 1 et 2 sont des vues en élévation d'une broche avec bobine pleine munie du moyen de sous-renvidage et montrent le fonctionnement du dispositif;
• - les figures 1 A et 2A sont des vues selon la ligne de coupe A-A respectivement des figures 1 et 2;
• - les figures 3 et 4 sont des vues en élévation correspondant aux figures 1 et 2 montrant le fonctionnement avec un tube vide;
• - la figure 5 est une vue en plan du moyen de sous-renvidage;
• - la figure 6 est une vue selon la ligne de coupe VI-VI dans la figure 5;
• - la figure 7 est une vue selon la ligne de coupe VII-VII dans la figure 5;
• - la figure 8 est une vue en élévation du dispositif de coupe vu selon la flèche F de la figure 7.

In order to better understand the invention, a nonlimiting exemplary embodiment will be described below, with reference to the appended drawings in which:

• - Figures 1 and 2 are elevational views of a spindle with a full spool provided with the sub-winding means and show the operation of the device;
• - Figures 1 A and 2A are views along the section line AA respectively of Figures 1 and 2;
• - Figures 3 and 4 are elevational views corresponding to Figures 1 and 2 showing the operation with an empty tube;
• - Figure 5 is a plan view of the sub-winding means;
• - Figure 6 is a view along the section line VI-VI in Figure 5;
• - Figure 7 is a view along the section line VII-VII in Figure 5;
• FIG. 8 is an elevation view of the cutting device seen according to arrow F in FIG. 7.

In Figure 1, there is shown the coil 1 which is full, the ring 2 and the cursor 3 movable on this ring.

This figure shows the situation in which the winding is finished and the reel 1 is full, the ring 2 and the slider 3 are lowered to their lowest position so as to allow the release of the reel and its removal.

During this descent, the last turns of the winding are wound around the reel and around the sub-winding means 4 which is located below the reel.

The device object of the invention mainly consists of two rings 5-6, one inside 5 (Figures 1-4 and 5-7) and the other outside 6 which can slide from top to bottom and bottom to top on the inner ring 5.

When the outer ring 6 is in the low position, it delimits with a shoulder 7 provided at the upper part of the inner ring 5 a groove 14 in which the last turns of the wire are wound before the reel is immobilized (end of the rotation).

On either side of the inner ring 5 are provided axes 9 on each of which is articulated a lever 8 (Figures 1-4). When they rotate around this axis 9, the levers 8 press on the underside of the outer ring 6 so that this ring 6 is then lifted by the levers 8 and moves upward along the inner ring 5.

The inner ring 5 comprises in diametrically opposite positions a vertical knife blade 11 (Figures 7 and 8); the outer ring 6 also includes, in diametrically opposite positions, a knife blade 12 which acts by pressing on the blade 11 using a spring 13.

During the upward movement of the outer ring 6, the cutting parts of these knives 11 and 12 come into contact and cut the turns of wire wound in the groove 14 located between the shoulder 7 of the inner ring 5, and the ring exterior 6.

The outer ring 6 comprises two pushers 15 in diametrically opposite positions.

During the upward movement of the outer ring 6, these pushers 15 meet the shoulder 7 of the inner ring and act on the turns of the wire which are thus pinched.

But these pushers 15 are arranged just next to the knives 11 and 12 and this in such a way that it is the end of the wire coming from the cursor 3 which is pinched and retained. As a result, the end of the wire coming from the full reel is free, thereby allowing the evacuation of the reel. The pushers 15 are subjected to the action of springs 16 to obtain an effective clamping of the wire.

The outer ring 6 comprises a pawl 17 articulated on an axis 18 and pushed towards the center of the spindle by a spring 19.

During the upward movement of the outer ring 6, this pawl 17 slides on the wall of the inner ring 5, then engages by the action of a spring 19 in a groove 20 provided in this inner ring 5.

Therefore, the outer ring 6 can no longer descend by itself. An external action is required to release the pawl 17 from the groove 20.

After stopping the spindle, an external action will be produced when the spindle is restarted, by the centrifugal force which will act on the pawl 17 and force it to disengage from the groove 20, then allowing the ring outer 6 to descend while releasing the wire.

The outer ring 6 has two pins 21 engaged in holes and pushed back by springs 22 against the shoulder 7 of the inner ring 5.

These tenons 21 have the function of positively pushing the outer ring 6 down as soon as the pawl 17 is released from the groove 20.

• - la bobine étant terminée, l'anneau 2 et le curseur 3 descendent et enroulent une ou deux spires dans la rainure 14;
• - les leviers 8 soulèvent la bague extérieure 6;
• - par ce mouvement, les couteaux 11 et 12 coupent ces spires de fil;
• - à ce moment l'extrémité du fil provenant du curseur 3 est pincée par un des poussoirs 15;
• - l'extrémité du fil provenant de la bobine 1 est libre et permet l'évacuation de cette bobine;
• - par le même mouvement des leviers 8, le cliquet 17 s'engage dans la rainure 20, empêchant la bague 6 de redescendre;
• - la bobine 1 est remplacée par un tube vide 24;
• - les leviers 8 redescendent;
• - l'anneau 2 et le curseur 3 montent légèrement de façon à se trouver en face de la partie inférieure du tube 24;
• - la broche démarre à vitesse lente, et quelques spires de fil sont enroulées sur le bas du tube 24. La vitesse est suffisamment lente pour que le cliquet 17, de par la force centrifuge, ne puisse se dégager de la rainure 20;
• - dès que quelques spires sont enroulées et enserrent l'extrémité du fil en provenance du curseur, le bobinage à proprement parler peut démarrer et la vitesse de la broche est augmentée;
• - par la force centrifuge, le cliquet 17 se dégage de la rainure 20. L'extrémité du fil en provenance du curseur est alors libérée, mais reste prise par les premières spires de fil;
• - la bague extérieure 6 est alors repoussée vers le bas par l'action des ressorts 22 et des tenons 21;
• - Le dispositif est alors prêt pour la prochaine opération du même type.

The complete process of removing a full coil and moving an empty tube is as follows:

• - the coil being completed, the ring 2 and the slider 3 descend and wind one or two turns in the groove 14;
• - the levers 8 raise the outer ring 6;
• - By this movement, the knives 11 and 12 cut these turns of wire;
• - at this moment the end of the wire coming from the cursor 3 is pinched by one of the pushers 15;
• - The end of the wire from the coil 1 is free and allows the evacuation of this coil;
• - By the same movement of the levers 8, the pawl 17 engages in the groove 20, preventing the ring 6 from coming back down;
• - the coil 1 is replaced by an empty tube 24;
• - the levers 8 descend;
• the ring 2 and the slider 3 rise slightly so as to be opposite the lower part of the tube 24;
• - The spindle starts at slow speed, and a few turns of wire are wound on the bottom of the tube 24. The speed is slow enough that the pawl 17, by centrifugal force, can not be released from the groove 20;
• - as soon as a few turns are wound and enclose the end of the wire coming from the slider, the winding itself can start and the spindle speed is increased;
• - By centrifugal force, the pawl 17 emerges from the groove 20. The end of the wire from the cursor is then released, but remains taken by the first turns of wire;
• - The outer ring 6 is then pushed down by the action of the springs 22 and the studs 21;
• - The device is then ready for the next operation of the same type.

The combination of the different movements and the realization of the sequences are carried out by mechanical, electrical and pneumatic means managed by an electronic programmer.

An important characteristic of the invention resides in the combination of the sliding rings 5-6 with the knife blades 11-12 arranged vertically in planes which contain the axis of the spindle.

The blades are essentially in the form of guillotine blades.

A difference from most known devices is that in these the blades are circular and arranged horizontally perpendicular to the axis of the spindle.

Another difference is that in known devices the cut is made on the strand of wire between the turns of sub-winding and the turns wound on the reel while in the invention all the turns of sub-winding are cut by knives in appropriate number and shape, when moving the outer ring 6 on the inner ring 5.

Claims (5)

1. An apparatus for monitoring and restarting the yarn yarnwhen the full bobbins on the spindles of a continuous spinning machine are replaced by empty tubes, means being provided for underwinding, cutting and retaining the yarn, characterised in that the apparatus comprises two rings, namely an inner ring (5) and an outer ring (6), each ring having one or more knife blades (11,12), the outer ring being so slidable vertically on the inner ring that the two blades (11, 12) contact the last turns of yarn wound between them and sever them, the blades being disposed vertically in planes which contain the spindle axis, the underwinding turns being deposited between the blades of the inner ring (5) and the blades of the outer ring (6).

2. An apparatus according to claim 1, characterised in that all the turns wound on the underwinding apparatus are cut in the movement of the outer ring (6) on the inner ring (5) by multiplication of the number of blades and by their preferred shape as guillotine.

3. An apparatus according to claims 1 and 2, characterised in that the outer ring (6) has lifters (15) or the like so arranged that in the upwards movement the yarn end originating from the traveller remains positively clamped between the two rings (5, 6) while remaining rigidly secured to the spindle, whereas the yarn end originating from the full bobbin is free.

4. An apparatus according to claims 1-3, characterised in that a pawl (17) or other means is or are provided to prevent the outer ring from dropping back by its own weight, so that the spindle may rotate at a reduced speed.

5. An apparatus according to claims 1-4, characterised in that the pawl (17) or other means disengages or disengage in response to centrifugal force and enables or enable the outer ring (6) to drop back as soon as the spindle runs at its normal operating speed; and lugs or the like (21 ) or other means are provided to force the ring to drop back into its initial position.

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