EP0406601A1 - Spinning or twisting device with a tubular element submitted to an optional negative pressure - Google Patents

Abstract

In a spinning or twisting device, to rectify a fault a yarn (35) is to be fed back into the bore (72) of a tubular element which can be subjected to a vacuum. This tubular element can be designed as a yarn draw-off tube of an open-end spinning device or as part of a pneumatic twisting member. A feeder (5) can be moved over and beyond the tubular element in a yarn insertion position. The end of the tubular element facing the path of movement of the feeder (5) has a mouthpiece (7) which has, in relation to the bore (72), on its side facing the yarn insertion position of the feeder (5), a yarn support (71) and on its side facing away from the yarn insertion position a yarn insertion groove (70) oriented in the direction of movement of the feeder (5). The bottom of the yarn insertion groove (70) is at a greater distance from the path of movement (54) of the feeder (5) than the yarn support (71). <IMAGE>

Description

The present invention relates to a spinning or twisting device with a tubular member that can be subjected to negative pressure, in the bore of which a thread can be returned, and with a feeder that can be moved over the tubular member into a thread insertion position.

With the help of such a device provided in a rotor spinning machine (DE 34 17 331 A1), the thread brought to a predetermined length is fed with the help of a feeder to a thread take-off tube, the feeder being pivoted so far over the thread take-off tube that the thread end over the Mouth of the thread take-off tube is located. A negative pressure prevails in the thread take-off tube, which is generated by the spinning negative pressure. The feeder is now used so that the thread can follow the suction air flow thus generated into the thread take-off tube ger pivoted back. Due to external influences, however, it can happen that the thread end is not exactly above the mouth of the thread take-off tube, so that it is then not possible to return the thread end to the thread take-off tube.

The object of the present invention is therefore to design a generic spinning device so that a safe insertion of the thread into the thread take-off tube or another tubular member of a spinning device, for. B. in a pneumatic swirl of an air spinning device is guaranteed.

This object is achieved in that the end of the tubular member facing the path of movement of the feeder has an orifice which has a thread support on its side facing the thread insertion position of the feeder and a thread support on its side facing away from the thread insertion position in relation to the bore of the tubular member Direction of movement of the feeder oriented thread insertion groove, the bottom of which is at a greater distance from the path of movement of the feeder than the thread support. This configuration ensures that the thread end in the thread insertion position of the feeder protrudes from the thread support as a rule into the open and can follow the air flow sucked into the tubular member at all without overcoming large frictional influences or frictional influences. In this way, the thread arrives safely in a simple manner into the mouth of the tubular member, so that when the feeder moves back later, the end of the thread so far into the tubular member Organ can be sucked back so that it is held there securely after release by the feeder by the negative pressure prevailing in the tubular organ.

To reduce possible friction, it can be provided that the thread insertion groove merges into the bore of the tubular member over a convex surface. It has been shown that it is particularly advantageous if the radii of the edges deflecting the thread are between 0.5 and 1.5 mm.

If the free thread end protrudes slightly beyond the thread insertion groove, the friction which is required for deflecting the thread end for insertion into the mouth of the tubular member is so minimal that it is negligible. Nevertheless, it is particularly advantageous, in particular for certain materials or with relatively low negative pressures in the tubular member, if the thread insertion groove has a length which is at least as long as the length of the thread end protruding beyond the thread support in the thread insertion position of the feeder. This ensures that the free thread end is unsupported in the area of the suction air flow of the tubular member of the spinning device and can thus get into the bore of the tubular member without overcoming frictional forces.

In order to also rule out friction between the thread end and the bottom of the thread insertion groove, it is provided according to an advantageous embodiment of this thread insertion groove that it has a concavely curved bottom which is essentially concave trically to the end of the thread support facing the thread insertion groove.

The free thread end is not kept taut on the way to the mouth of the tubular organ. In order nevertheless to ensure that this end reaches the area of the suction air flow which acts in the mouth area of the tubular member, an advantageous further development of the subject matter of the invention provides that the thread insertion groove - in relation to the movement of the feeder to its thread insertion position - is the thread end of the thread insertion groove feeding thread guide is connected upstream.

The thread guide can be designed differently. According to a preferred embodiment, the mouthpiece on its side facing away from the feeder in the thread insertion position has a wall upstream of the thread insertion groove, which extends essentially transversely to the movement path of the feeder and in which the thread guide is designed as a notch. According to an advantageous embodiment of the subject matter of the invention, the feeder has a guide on its side facing the mouth, the maximum outer width of which is smaller than the maximum inner width of the notch and which can be moved through the notch when the feeder is moved to its thread insertion position.

The notch is preferably designed asymmetrically in such a way that its imaginary center line approaches the pivot axis of the feeder with increasing distance from the movement path of the feeder. In this way it is achieved that the When the feeder pivots into its thread insertion position, the thread is drawn deeper and deeper into the notch and is thereby held securely in a position such that the thread enters the thread insertion groove. To ensure that the thread remains in the notch with certainty, the edge of the notch facing the pivot axis of the feeder can expediently form an angle with the plane of movement of the feeder which - measured from the inside of the notch - does not fall below 85 °. This angle is preferably greater than 90 °. Alternatively or additionally, it can be provided for this purpose that the edge of the notch facing the pivot axis of the feeder is undercut.

According to a further advantageous embodiment of the subject matter of the invention, the thread guide is designed as a guide groove which extends along the movement path of the feeder. Through this guide groove, the thread end is inevitably oriented in the direction of the thread insertion groove.

For easier insertion of the thread into the guide groove, the latter advantageously has an extension on its side facing away from the thread insertion position of the feeder.

Depending on the fiber material, the free thread end protruding from the feeder shows certain deviations from the desired length. In order nevertheless to ensure that the thread end, despite a possible support on the side of the mouth piece facing away from the thread insertion position of the feeder, reaches the bore of the tubular organ, it is advantageous if the guide tion groove has a bottom which is on its side facing away from the thread insertion position of the feeder a smaller distance from its path of movement than on its side facing the thread insertion position. The guide groove is thus inclined in the direction of the bore of the tubular member, which reduces the friction if the free thread end should extend beyond the thread insertion groove. It is particularly advantageous if the bottom of the guide groove extends essentially along the imaginary connecting line between the end of the guide groove facing away from the thread insertion position of the feeder and the mouth of the tubular member facing the path of movement of the feeder.

According to a further advantageous embodiment of the subject matter of the invention, the guide groove extends beyond the thread insertion groove in the direction of the feeder located in the thread insertion position, the thread support being part of this guide groove. In this way, the thread end is guided before and after the bore of the tubular member of the spinning device.

If the feeder is pivotable about a pivot axis, it is advantageous if the thread between the thread guide and the feeder in the thread insertion position takes such a course that the thread is certainly above the thread insertion groove despite the curved pivoting path of the feeder. For this purpose it can be provided in an advantageous embodiment of the inventive device that the end of the thread insertion groove facing the thread insertion groove Upstream thread guide is located at a greater distance from the pivot axis of the feeder than the end of the thread insertion groove facing the thread guide. It is expediently provided that the connecting line between the thread guide and the feeder intersects an area in the region of the thread insertion groove which is placed by the end of the tubular member facing the movement path of the feeder and the thread insertion groove.

In order to be able to hold the thread on the desired path in the case of a pivotable mounting of the feeder, it can be provided that the thread guide upstream of the thread insertion groove carries on its side facing the pivot axis of the feeder an elastic or elastically supported element which extends up to the movement path of the feeder .

It is often desirable to place the usual thread monitor as close as possible to the spinning element. In order to make this also possible with the subject matter of the invention, according to a particularly advantageous embodiment of the subject matter of the invention, it is provided that the mouthpiece has a recess with a lateral opening through which the free end of a pivotable thread probe extends into the recess, in the bottom of which the thread insertion groove is provided is and which extends in the direction of the thread support beyond the bore of the tubular organ and receives the free end of the thread sensor between the bore and the thread support, the recess with respect to the thread support having a depth which is greater than the sum of the thickness or the By knife of the thread sensor and its distance from the bottom of the recess. In this way it is ensured that the thread reaches the side facing away from the feeder when it is placed in front of the mouth of the tubular member and thus reaches the desired side of the thread sensor for the later spinning process.

In a further advantageous embodiment of such an inventive device it can be provided that the recess is chamber-like and is covered on its side facing the path of movement of the feeder by a wall which is intersected by the guide groove extending on both sides of the thread insertion groove. As a result, particularly reliable guidance is also achieved in connection with a thread monitor.

The insertion of the thread end into the bore of the tubular member is carried out the better, the stronger the suction air flow acting in this tubular member. In order not to have to have a particularly strong suction air flow and nevertheless to achieve an intensive influence of this suction air flow on the thread end, it can therefore be provided that a cover can be delivered to the mouthpiece. In this way, an intensive effect on the thread end can be achieved despite a relatively low negative pressure in the tubular organ. The cover can expediently be controlled by the feeder depending on its position.

It is often desirable to secure the thread in the area of the mouth of the tubular organ for a longer period of time. In order to achieve this goal, it can be provided in a further embodiment of the device according to the invention that the thread support of the mouthpiece is designed as a clamping element, to which a clamping element which is movable essentially parallel to the movement path of the feeder can be advanced.

In order to reduce any unavoidable frictional forces, at least that part of the mouthpiece which receives the thread insertion groove is advantageously made of statically non-chargeable plastic.

For reasons of manufacture, the mouthpiece is expediently not formed in one piece with the tubular member of the spinning device, but is advantageously positively connected to the tubular member and / or cover covering the spinning or twisting device, this connection being able to take place by means of a snap-in connection.

The invention can be applied to various spinning devices. In a particularly advantageous embodiment, the spinning device is designed as an open-end spinning device, the tubular member being formed by the thread take-off tube. However, the subject of the invention can also be used in spinning devices which have a pneumatic swirl member as the spinning member; in this case the tubular member is part of this pneumatic swirl member.

The invention is simple in construction, saves space and can also be retrofitted in a simple manner. It ensures safe feeding of the thread end to the tubular organ and thus also enables trouble-free insertion there, so that safety is increased during the subsequent thread return process.

• Fig. 1 in perspektivischer Ansicht eine Offenend-Spinnstelle mit der erfindungsgemäßen Vorrichtung;
• Fig. 2 im Längsschnitt ein erfindungsgemäß ausgebildetes Mündungsstück;
• Fig. 3 im Längsschnitt ein Detail einer abgewandelten Ausführung eines erfindungsgemäßen Mündungsstückes;
• Fig. 4 in perspektivischer Ansicht eine weitere Abwandlung eines erfindungsgemäß ausgebildeten Mündungsstückes;
• Fig. 5 im Querschnitt ein erfindungsgemäßes Mündungsstück zu­sammen mit einem erfindungsgemäß ausgebildeten Zubringer;
• Fig. 6 in der Seitenansicht ein abgewandeltes Detail des in Fig. 5 gezeigten Mündungsstückes;
• Fig. 7 in perspektivischer Ansicht eine weitere Abwandlung eines erfindungsgemäß ausgebildeten Mündungsstückes; und
• Fig. 8 in der Draufsicht einen Zubringer sowie ein Mündungsstück gemäß der Erfindung.

Further details of the invention are explained below with reference to exemplary embodiments with the aid of drawings. Show it:

• Figure 1 is a perspective view of an open-end spinning station with the device according to the invention.
• Fig. 2 in longitudinal section an inventive mouthpiece;
• 3 shows in longitudinal section a detail of a modified embodiment of a mouthpiece according to the invention;
• 4 is a perspective view of a further modification of an orifice piece designed according to the invention;
• 5 shows in cross section a mouthpiece according to the invention together with a feeder designed according to the invention;
• 6 shows a modified detail of the mouthpiece shown in FIG. 5 in a side view;
• 7 is a perspective view of a further modification of a mouthpiece designed according to the invention; and
• Fig. 8 in top view a feeder and a mouthpiece according to the invention.

For the sake of simplicity, the subject matter of the invention is explained below using the example of an open-end spinning machine which can have spinning rotors, friction spinning elements, electrical or electrostatic or else purely pneumatic spinning elements as spinning elements.

The open-end spinning machine is shown in FIG. 1, only the parts necessary for understanding the invention being shown. In it, a plurality of open-end spinning devices are arranged side by side, of which only the covers 10 and 11 of two adjacent spinning positions can be seen in FIG. 1. The covers 10, 11 each cover a spinning device, each of which in the usual and therefore not shown manner, an open-end spinning element, e.g. has a spinning rotor with a fiber collecting surface.

The open-end spinning element is preceded by a disintegration device (not shown), to which a sliver is fed using a feed device (not shown). The dissolving device dissolves the sliver into individual fibers, which are fed to the open-end spinning element and are deposited there on the fiber collecting surface under the action of a suction air stream (negative vacuum). The fibers are in the end of a thread end integrated and drawn off in the form of a thread 35 through a thread draw-off tube 12 with the help of a pair of draw-off rollers 2, which is formed in the usual way from a driven draw-off roller 20 and a pressure roller 21 resting elastically thereon. The drawn thread 35 is fed to a winding device 3, which has a driven winding roller 30, on which a bobbin 31 rests during the spinning operation. The bobbin 31 is carried in a known manner between two bobbin arms 32 and 33, by means of which the bobbin 31 can be brought into contact with the bobbin roller 30 or can be lifted off the bobbin.

An auxiliary drive device 34, which has a drivable auxiliary drive roller 340, can be delivered to the coil 31. Since auxiliary drive devices of this type are known, the usual swivel drive and the drive device for this purpose have been omitted for reasons of clarity.

In order to be able to suck off the resulting thread end from the bobbin 31 in the event of a thread break, a suction tube 4 which can be fed to the bobbin 31 is provided. This suction tube 4 has a mouthpiece 40 in the usual way, which extends in the receiving position in the vicinity of the coil 31 parallel to its surface line over the entire length of the coil 31. On its side facing the winding device 3 and the spinning device - from which only the cover 11 can be seen - the suction tube 4 has a longitudinal slot (not shown), through which the thread 35 can exit the suction tube 4 if this is shown in FIG 1 position shown is pivoted back.

A centering device 41 is located in the thread path of the thread 35 emerging from the suction tube 4. In the exemplary embodiment shown, this consists of a drivable spindle with two length sections 410 and 411 of different diameters, between which there is a circumferential groove 412. The centering device 41 is mounted on a swivel arm 413, which can be brought into different swivel positions by a swivel drive 414 about a swivel axis 415.

The length section 410 facing the swivel arm 413 has a larger diameter than the length section 411 at the free end of the centering device 41. In addition, the two length sections 410 and 411 have opposite threads. The centering device 41 can be driven selectively in each of the two directions of rotation by means of a drive 416.

A feeder 5 can be fed to the thread 35 extending from the suction pipe 4 via the centering device 41 to the bobbin 31. The feeder 5 consists essentially of a swivel arm 50 which can be swiveled about its swivel axis 52 with the aid of a swivel drive 51. At its free end facing away from the pivot axis 52, the feeder 5 has a controllable thread clamp 53 which, according to FIG. 1, consists of a clamping jaw 530 rigidly connected to the pivot arm 50 and a clamping jaw 531 movable for this purpose. A drive 532 is assigned to this clamping jaw 531, for example in the form of an electromagnet.

The feeder 5 is pivotable in the direction of arrow P 1 over the cover 11 to over the thread take-off tube 12 into the position shown in FIG. 1, the thread insertion position, in order to present the thread 35 to the thread take-off tube 12. The thread insertion position should be understood to mean the position of the feeder 5 in which the thread 35 with its thread end 350 is located above the mouth of the thread take-off tube 12 and can be inserted into it.

The thread take-off tube 12 has at its end of this movement path 54 - see FIG. 2 - of the feeder 5 an orifice piece 7 which on its side facing away from the thread insertion position of the feeder 5 - with respect to the bore of the thread take-off tube 12 - has a thread insertion groove 70 and on it has a thread support 71 on the side facing the thread insertion position. As can be seen from FIG. 2, the bottom 700 of the thread insertion groove 70 is at a greater distance from the path of movement of the feeder 5 than the thread support 71. The reason for this will be explained in more detail later.

The thread insertion groove 70 is oriented essentially in the direction of movement (arrow P₃) of the feeder 5.

In the thread path between the end of the longitudinal slot of the suction tube 4 facing away from the bobbin 31 and the centering device 41, a cutting device 8 is provided in such a way that a thread 35 can be separated on the side of the thread clamp 53 facing away from the bobbin 31.

According to the exemplary embodiment shown in FIG. 1, the cutting device 8 consists of a roller 80 which serves as an anvil and with which a cutting edge 81 cooperates, for which purpose a drive 82 is assigned. For illustrative reasons, the cutting device 8 in FIG. 1 has been shown somewhat rotated relative to the actual arrangement.

Of course, corresponding drive and control elements are assigned to the individual elements described, which can be designed in a generally customary manner and are therefore not shown in the figures for the sake of clarity. The drive and control elements are controlled by a control device, not shown, which also controls the entire piecing process. Other common parts such. B. traversing thread guide, thread tension compensation bracket, etc. have been omitted to simplify the illustration in the drawings.

After the construction of the device has been described, its function will now be explained in more detail:

During normal spinning operation, the thread 35 spun in the usual manner in the spinning device is fed with the aid of the draw-off roller pair 2 to the bobbin 31 driven by the winding roller 30 and wound onto it, the thread 35 being held under constant tension as usual by thread tension compensation means (not shown) and is oscillated by a traversing thread guide, not shown.

If a yarn breakage occurs, the open-end spinning device is shut down in a known manner, so that no more fibers get onto the fiber collecting surface of the open-end spinning element. In addition, the coil 31 is lifted off the winding roller 30 with the aid of known means and therefore not shown, so that the coil 31 is also stopped.

To re-spin the thread 35, the open-end spinning element is cleaned in a known manner, which is generally braked temporarily, possibly even to a standstill.

In order to be able to return the end of the torn thread 35 from the bobbin 31 of the bobbin device 3 to the fiber collecting surface of the open-end spinning element, this end must be pulled off the bobbin 31 again. For this purpose, the auxiliary drive roller 340 of the auxiliary drive device 34 is then delivered to the bobbin 31 lifted off the winding roller 30. The auxiliary drive roller 340 is now driven in the opposite direction to the normal winding direction using conventional means. In addition, the suction pipe 4 is pivoted against the coil 31 and a negative pressure is generated in it, in accordance with the feed movement of the auxiliary drive device 34. The thread end is thus sucked into the suction pipe 4. After a sufficient length of the thread 35 has entered the suction tube 4 so that it is held securely by the suction air flow prevailing here, the suction tube 4 is pivoted away from the spool 31, with part of the thread 35 coming out of the suction tube 4 through its longitudinal slot emerges, but is still held in the intake manifold 4 with its free end.

The thread 35 emerging from the suction pipe 4 reaches the centering device 41, which is then driven so that the thread 35 reaches its circumferential groove 412. The thread 35 thus assumes a defined thread path between the slot end of the suction tube 4 facing away from the spool 31 and the centering device 41.

The feeder 5 is initially in a starting position 5a. It is now pivoted in the direction of arrow P₁. The thread clamp 53 passes the thread path of the thread 35 extending from the slot end in the suction tube 4 to the centering device 41, grips and clamps it between its clamping jaws 530 and 531, which may first open to grip the thread 35 and close again after the thread 35 has been picked up can be.

The feeder 5 then reaches its cutting position, the thread 35 coming into the effective range of the cutting device 8. This is now operated. The thread 35 cut in this way thus has a defined thread length between the thread clamp 53 and the cutting device 8.

After the thread 35 has been brought to this defined thread length, the feeder 5 to the open-end spinning device (see cover 11) is moved further into its thread insertion position shown in FIG. 1, the thread clamp 53 being guided over the mouth of the thread take-off tube 12. In this case, the free thread end 350 of the cut thread 35 reaches in the direction parallel to the direction of movement of the feeder 5 (see Arrow P₃) extending thread insertion groove 70, which ensures that the thread 35 comes into the area of the suction air flow, which prevails in the thread take-off tube 12 due to the spinning vacuum. The thread 35 lies on the thread support 71 between the thread insertion groove 70 and the feeder 5 located in the thread insertion position.

When the feeder 5 has reached its thread insertion position (see FIG. 1), the thread end 350 extends from the thread clamp 53 to above the thread insertion groove 70.

The negative pressure produced in the bore 72 of the mouthpiece 7 due to the negative pressure prevailing in the spinning device generates a suction air flow in the direction of the arrow P₂. The thread end 350 is now exposed to this flow. Due to the slot shape of the thread insertion groove 70, this suction air flow is only effective in the area of the thread insertion groove 70 with respect to the thread end 350.

As already mentioned in connection with FIG. 2, the bottom 700 of the thread insertion groove 70 is arranged at a greater distance from the path of movement 54 of the feeder 5 than the thread support 71. The thread end 350 thus hangs freely in the air and can thus be unimpeded in that Follow thread insertion groove 70 in the direction of arrow P₂ acting suction air flow and thus gets into the bore 72 of the mouthpiece 7th

The feeder 5 now returns in the direction of the arrow P₄ (Fig. 1) and remains in the transfer position above the coin extension 1 stand. The thread end 350 is sucked deeper and deeper into the thread take-off tube 12 in accordance with the pivoting back movement of the feeder 5. In the transfer position of the feeder, the thread clamp 53 is opened so that the thread 35 is released from the feeder 5.

The thread 35 sucked in the direction of the fiber collecting surface of the open-end spinning element, not shown, lies on the fibers that have been returned to the fiber collecting surface in the meantime, for which purpose a thread reserve (not shown) previously formed during the return delivery of the thread 35 into the suction tube 4 must be released. Then the thread take-off starts again in a manner known per se, and the thread 35 is wound onto the winding roller 31, which has now been lowered onto the winding roller 30 and is separated from the auxiliary drive device 34. By appropriate driving of the centering device 41 opposite to the previous direction of rotation, which was required for centering the thread 35, the thread 35, timed to the release and return of the thread 35, is moved over the length section 411 to its free end and discarded.

The thread end 350 to be returned to the spinning element can be prepared for piecing in a known manner. Cutting to length with the aid of a cutting device 8 can be quite sufficient. However, it can also be tapered in the usual way with the aid of a preparation device, not shown. Such a thread end 350 is shown in FIG. 3.

It goes without saying that if it is a rotating spinning element, e.g. B. is a spinning rotor, this must be brought back to running in a coordinated manner on the piecing process.

A comparison of Figures 2 and 3 shows that the thread insertion groove 70 can be designed differently. According to the embodiment shown in FIG. 2, the thread insertion groove 70 essentially has a rectangular profile in cross section, the edges 73 and 74 deflecting the thread 35, which also includes the transition edge into the bore 72 of the mouthpiece 7, being designed as a convex surface, d. H. have a rounded profile. It has proven to be particularly advantageous if these rounded edges 73 and 74 have a radius that is between 0.5 and 1.5 mm. It has been shown that, with smaller radii, the friction, depending on the roughness of the yarn, can become so great that a reliable insertion of the thread end 350 into the bore 72 can no longer be guaranteed. On the other hand, it has been shown that if the radius of these edges 73 and 74 is too large, the wrap friction has a disadvantageous effect and thus can also impede or complicate insertion of the thread end 350 into the bore 72 of the mouthpiece 7. Depending on the material, this may already be the case with radii that are larger than 1.5 mm.

As a rule, it is desirable to determine the length of the thread end 350 on the one hand by correspondingly determining the cutting position of the feeder 5 and the length of the thread end 350 located in the region of the mouthpiece 7 by correspondingly Determination of the thread insertion position of the feeder 5, on the other hand, so that the thread end 350 extends freely from the thread support 71 to above the thread insertion groove 70. The thread insertion groove 70 thus has a length which is at least as long as the length of the thread end 350 which projects beyond the thread support 71.

Depending on the material, however, this goal cannot always be exactly achieved without the mouthpiece 7 having to be excessively large. If e.g. B. the cut to length with the help of the cutting device 8 thread end 350 is still subjected to a preparation process so that the thread end 350 acquires a tapering shape, then a somewhat larger thread length must be returned to the fiber collecting surface than if the thread 35 is only cut to length to achieve sufficient strength of the piecing. In this case, it may be useful to set the thread insertion position of the feeder 5 so that the thread end 350 extends beyond the thread insertion groove 70.

As mentioned, however, the thread insertion groove 70 is dimensioned and matched to the movement of the feeder 5 such that the thread end 350 resting on the thread support 71 hangs freely in the air above the thread insertion groove 70. The thread insertion groove 70 thus has such a length and depth that the thread end 350 does not come into contact with the walls of the thread insertion groove 70 when it is deflected in the direction of the bore 72 - apart from at most the side walls of the thread insertion groove 70 which guide the thread end 350 .

According to Fig. 3, therefore, the thread insertion groove has a concavely curved bottom. The curvature is such that the bottom 700 of the thread insertion groove 70 extends essentially concentrically to the end of the thread support 71 facing the thread insertion groove 70.

Fig. 4 shows a mouthpiece 7, which has a recess 75, which has an opening 751 on the side, so that a pivotally mounted thread sensor 9 can reach into the recess 75 laterally. The thread insertion groove 70 is provided in the bottom 750 of the recess 75. The recess 75 extends on its side facing away from the thread support 71 at least as far as the thread insertion groove 70. On its side facing the thread support 71, the recess 75 extends beyond the thread insertion groove 70 and the bore 72 to such an extent that between the thread support 71 and the Hole 72 of the thread sensor 9 pivoted into the rest position finds place. In addition, the recess has a depth h (see FIG. 5) which is greater than the sum of the diameter d or the thickness of the thread sensor 9 and the distance a of the thread sensor 9 from the bottom 750 of the recess 75. This ensures that the deflection of the thread in the bore 72 of the mouthpiece 7 and thus also in the bore of the thread take-off tube 12 can be carried out unimpaired by the thread sensor 9, so that the latter can be arranged in close proximity to the spinning element.

According to the embodiment shown in FIGS. 4 to 6 and 8, it is provided that the thread insertion groove 70 - based on the feed movement (arrow P₃) of the feeder 5 - a thread guide tion 76 is connected upstream. The guide 76 is intended to ensure that the thread end 350 reaches the thread insertion groove 70 and thus in the region of the concentrated suction air flow which is sucked into the bore 72.

In the embodiment shown, on the mouthpiece 7 on its side facing away from the feeder 5 located in the thread insertion position, a wall 760 oriented transversely to the direction of movement (arrow P₃ in FIG. 4) of the feeder 5 is provided, in which the thread guide is formed is. This has the shape of a notch 761, which tapers with increasing distance from the movement path 54 of the feeder 5.

1, the feeder 5 is mounted on a pivot axis 52. The feeder 5 therefore executes a circular movement, as a result of which the position of the thread 35 relative to the mouthpiece 7 also changes.

In order to ensure that the thread 35 extending from the feeder 5 to the notch 761 enters the thread insertion groove 70, the notch 761 is in relation to a surface e through the bore 72 of the mouthpiece 7 and the thread insertion groove 70 on the pivot axis 52 of the Feeder 5 facing away. Thus, the thread guide 76 formed by the notch 761 is arranged at a greater distance from the pivot axis 52 of the feeder 5 than the end of the thread insertion groove 70 facing the notch 761 (FIG. 8). This ensures that the thread path is 5 despite the circular path of the feeder. 5 even when it has reached its thread insertion position, it is still in the area of influence of the suction air flow supplied to the thread take-off tube 12.

This suction air flow can act particularly intensively on the thread end 350 if the connecting line 35a between the thread guide 76 designed as a notch 761 and the feeder 5 intersects the plane or surface e in the length region of the thread insertion groove 70, which through the bore 72 - or that of the movement path 54 of the feeder 5 facing end of the thread take-off tube 12 - and the thread insertion groove 70 is placed. In this way it is ensured that the thread end 350, even when the feeder 5 has passed the mouthpiece 7 and is brought into its thread insertion position, still extends over the thread insertion groove 70, so that the thread end 350 securely in after leaving the notch 761 the thread insertion groove 70 and thus also enters the thread take-off tube 12. It goes without saying that depending on the installation position (horizontal or more or less inclined) this offset of the z. B. formed as a notch 761 thread guide 76 correspondingly larger or smaller.

5 and 6, it is provided that the notch 761 is asymmetrical in such a way that a straight line bisecting the notch 761 (center line g) has such an inclination that it increases with increasing distance from the movement path 54 of the feeder 5 whose pivot axis 52 approaches. In this way it is achieved that the feeder 53 pulls the thread 35 ever deeper into the notch 761 during its movement into the thread insertion position, so that the thread 35 in this Secured position and also safely with its thread end 350 in the thread insertion groove 70.

The security with which the thread 35 is prevented from unintentionally leaving the notch 761 can be increased further by the side edge 768 of the notch 761 facing the pivot axis 52 of the feeder 5 relative to the plane of movement (movement path 54) of the feeder 5 Inclination has that the angle α between the plane in the path of movement 54 of the feeder 5 and this side edge 768 - seen from the inside of the notch 761 - does not fall below 85 ° and is preferably even over 90 °. In addition, it can also be provided that this edge 768 is undercut and has a nose 762, which holds back the thread 35 with certainty, so that the thread end 350 cannot leave the notch 761 laterally in the direction of the pivot axis 52 of the feeder 5.

5 it is provided that the feeder 5 has on its side facing the mouthpiece 7 a guide 55 consisting of two elements 550 and 551, which is guided through the notch 761 into the thread insertion position when the feeder 5 is moved. For this purpose, the maximum outer width W _{a of} the guide 55 is smaller than the clear or inner width W _{i of} the notch 761. Thanks to the guide 55, the thread end 350 is inevitably inserted into the notch 761, in which the thread end 350 due to the geometry of the Notch 761 is held securely.

The guide 55 and the thread guide 76 can be designed differently, for. B. in the form of a groove, a notch, two bolts, etc. Instead of a notch 761, as shown in FIG. 3, the thread insertion groove 70 is connected as a thread guide 76, a guide groove 764 which extends in the direction of movement (arrow P₃) of the feeder 5. In order to securely insert the thread end 350 into the guide groove 764 when the feeder 5 is moved over the mouthpiece 7, it can be provided that the guide groove 764 widens in a funnel shape on its side facing away from the thread insertion position of the feeder 5 (see extension 765 in FIG. 7 ).

When the feeder 5 is formed with a guide 55, close tolerances must be observed in order to ensure that the guide can be guided safely through the notch 761. Fig. 1 shows another embodiment in which the thread is securely guided into the notch 761 without special consideration of tolerances. 1 extends from the wall 760, which contains the thread guide groove 76 (notch 761) upstream of the thread insertion groove 70, an elastic element in the form of a flap 763 in the direction of the movement path 54 of the feeder 5. This flap 763 ensures that the thread 35 is correctly inserted into the notch 761 by the feeder 5.

This tab 763 extends at least close to the movement path 54 of the feeder and, in the preferred exemplary embodiment shown, even up to the movement path 54 of the feeder gers 5, so that the thread end 350 has no other option than to penetrate the notch 761.

The elastic element can also be different, e.g. B. in the form of an elastic pin. Instead of an elastic element, a retaining element can also be provided, which itself is rigid, but is elastically mounted so that it can avoid the feeder 5.

The bottom 766 of the guide groove 764 does not have to run parallel to the movement path 54 of the feeder 5. The feeding of the thread end 350 to the thread insertion groove 70 and to the bore 72 of the mouthpiece 7 is facilitated if the bottom 766 on its side facing away from the thread insertion position of the feeder 5 has a smaller distance from the movement path 54 of the feeder 5 than on its side fed to the thread insertion position. A slope of the bottom 766 in the direction of the bore 72 facilitates the insertion of the thread end 350 into the bore 72, the deflection of the thread end 350 in the direction of the thread insertion groove 70 already beginning before the feeder 5 has reached its end position, namely the thread insertion position. A design has proven to be particularly advantageous (see FIG. 3), in which the bottom 766 of the guide groove 764 essentially the connecting line y between the end 764 'facing away from the thread insertion position of the feeder 5' of the guide groove 764 and that of the movement path 54 of the feeder 5 facing mouth of the tubular member (z. B. thread take-off tube 12) follows, the bore 72 of the mouthpiece 7 can also take the place of this mouth.

As the above description shows, the spinning device can be modified in many ways within the scope of the present invention. It is thus possible to replace individual characteristics with equivalents or to combine them with other characteristics in another way. Also, the tubular member to which vacuum can be applied does not necessarily have to be designed as a thread take-off tube 12 of an open-end spinning device. If a spinning or twisting device is provided which has a pneumatic swirl member, this or a part thereof can form the tubular member in the sense of the invention. With the help of this twisting element, several individual threads can be twisted together in a known manner or a twisted thread can be produced by twisting a warped fiber sliver through the twisting element and holding it in the twisted state by incorporating previously spread fiber ends.

With such a spinning and twisting device, it is necessary to return the twisted or spun thread to the twist after it has broken. In order to be able to pressurize this swirl element with negative pressure, it either has compressed-air bores that are inclined in the opposite direction to the normal take-off direction, or on the side of the swirl element that forms its feed side during normal production operation, an element that can be placed under vacuum can be brought to suck back the thread end .

Here too, the same problems arise as when the thread 35 is returned to the thread take-off tube 12 of an open-end spinning machine; thus can also in connection with such A twisting or spinning device with a tubular spinning or twisting element which can be subjected to negative pressure, namely a pneumatic swirl element, a feeder 5 and an orifice piece 7 of the type described are used.

The device can be designed so that the elements of the spinning or twisting device required for working during normal production (twisting or spinning) are provided at each work station; the elements, however, which are only used to initiate the normal operation, e.g. B. the piecing, can be arranged on a movable along a variety of similar jobs maintenance device.

However, only a single job is provided, e.g. B. as a test device, it goes without saying that both the elements required for normal work and for starting up must be provided at the work place itself.

The feeder 5 can also be designed and movable differently than shown. For example, it can be pivotable about a horizontal pivot axis instead of, as shown, about a vertical pivot axis; but it can also be slidably mounted in a backdrop-like guideway. Depending on the type of movement of the feeder 5 (linear or circular), the surface 4 can be flat or curved.

The thread clamp 53 can be designed differently, for. B. in the form of two, possibly in the direction of rotation drivable rollers or in the form of a drivable roller and a non-rotatable counterpart. Instead of a thread clamp 53, however, a sieve which can be subjected to negative pressure can also be provided, so that the thread 35 can be sucked against the sieve by the negative pressure and can be held in this way as long as the negative pressure is maintained.

The cutting device 8 can be designed differently, for. B. in the manner of scissors.

According to the exemplary embodiment shown in FIG. 2, the thread support 71 is designed as a clamping element, to which a further clamping element 710 can be delivered, which can be moved parallel to the movement path 54 of the feeder 54.

This further clamping element 710 is designed according to the exemplary embodiment shown as an elastic tab; other training, e.g. B. in the form of a rubber band loop or in the form of an deformable or only slightly deformable block or plate-shaped, elastically mounted stop are also possible.

With the help of such clamping elements 71 and 710, it is possible to use the mouthpiece 7 also in connection with mass piecing when a large number of similar spinning positions located next to one another are stopped together and spun together again.

When this large number of work stations (spinning or twisting stations) are shut down, the individual elements of this work station are stopped in a known, synchronized manner so that the thread ends 350 at the individual work stations are at least largely pulled out of the thread take-off tube 12 or another annular member. So that the thread end 350 cannot leave this position when the machine is at a standstill, when the tubular member is not under negative pressure, the movable clamping element 710 is moved in the direction of arrow P 3 over the mouthpiece 7 and is in contact with the clamping element ( Thread support 71) brought.

If the machine is to be put back into operation after a pause, the individual elements of the workstations are switched on in a synchronized manner known per se. Matched to this, the clamping element 710 also returns to its rest position in the direction of the arrow P₄, in which it is located outside the movement path 54 of the feeder 5. The free thread end 350, which is located in the area of influence of the again effective suction air flow of the tubular organ, is sucked into the latter, so that the further process proceeds in a manner known per se.

Since the clamping element 710 releases the movement path 54 of the feeder 5 when spinning on, it can work in the manner described in the event of faults without being hindered by the clamping element 710.

A further modification of a mouthpiece is shown in FIG. 7. The mouthpiece 7 is formed in two parts and consists of a lower part 77, which receives the recess 75 and the thread insertion groove 70, and a lid-like upper part 78, in which a guide groove 767 is located which - in relation to the direction of movement of the feeder 5 marked in the arrow P₃ in its thread insertion position - extends from the feed end of the mouthpiece 7 over the thread insertion groove 70 in the direction of the thread insertion position of the feeder 5 to the removal of the mouthpiece 7. The guide groove 767 merges into the thread insertion groove 70 and the thread support 71 is formed by the bottom of the guide groove 767 and is therefore a part thereof.

Similarly, when removing a thread break, it is also possible for the feeder 5 to pull the thread end 350 over the bore 72, so that the thread end 350 is only sucked into the bore 72 when the feeder 5 moves back. For this purpose, it is only necessary that the suction air flow in the region of the thread end 350 is so intensive that the mouthpiece 7 is designed so that it can pull the thread end 350 back. For this reason, deflection edges in the area of the thread support 71 are to be designed in the same way as the edges 73 and 74 (see FIG. 2).

In order to reduce the retention of the thread end 350 on the mouthpiece 7 as much as possible, the coefficients of friction, adhesion values, etc. must be reduced. This is done primarily by suitable shaping of the thread 350 in contact surfaces, edges and profiles (of the grooves) of the mouthpiece 7. In addition to the selection of a suitable shape for the surfaces and edges which come into contact with the thread end 350, the material also plays a major role. It is advantageous if at least that part of the mouthpiece 7 which receives the thread insertion groove 70 and extends up to the bore 72 consists of statically non-chargeable plastic. For this purpose, the thread insertion groove 70 can be formed in an insert of the mouthpiece 7 or else the mouthpiece 7 can have a base body made of such a plastic, which optionally carries further parts, possibly made of a different material. An exemplary embodiment will be described later with the aid of FIG. 7. However, it can also be advantageous if the thread support 71 is made of such a non-rechargeable plastic in the same way.

A further possibility for intensifying the air flow in the area of the bore 72 (see FIG. 5) and in particular the thread insertion groove 70 or the guide groove 767 is indicated by dashed lines in FIG. 7, the guide groove being coverable by a cover 6. This cover 6 is normally located outside the movement path 54 of the feeder 5 and is delivered to the mouthpiece 7 after the feeder 5 has passed the mouthpiece 7.

For this purpose, the cover 6 can be controlled in any way, for example from the control device (not shown), which also controls the entire piecing process (in the case of open-end spinning devices). But it can also prove be coupled with the feeder 5 and then, when the feeder 5 swung out of the starting position has arrived above the mouthpiece, so that the feeder 5 continues to run into its thread insertion position, but the cover 6 remains at the mouthpiece 7 and covers it. When the feeder 5 swivels back, the cover 6 is then coupled again to this feeder 5.

But it can also be provided that the feeder 5 after passing through the mouthpiece 7 - when moving into the thread insertion position - actuated a switch or linkage, which causes the cover 6 to be brought from its rest position into its working position, in which it covers the mouthpiece 7. The switch or linkage is actuated depending on the position of the feeder 5 at the earliest when it has passed the mouthpiece 7 in the direction of the thread insertion position, and at the latest when the feeder 5 has reached its thread insertion position. Conversely, the feeder 5 causes a release of the mouthpiece 7 in a timed manner on its return movement such that when the feeder 5 reaches the mouthpiece 7, the cover 6 has released the movement path 54 of the feeder 5 again.

As FIG. 7 shows, the recess 75 (compare with FIG. 4) on its side facing the movement path 54 of the feeder 5 can be covered by a cover-like part 78, so that the recess 78 is like a chamber in the mouthpiece 7 is included. The side of the lid-like part 78 of the mouthpiece 7 facing the movement path 54 of the feeder 5 is cut through by the guide groove 767 extending on both sides of the thread insertion groove 70. The covering of the chamber-like recess 75 in turn causes an intensification of the air flow in the area of the thread insertion groove 70 and also the guide groove 767.

The mouthpiece 7 can in principle be connected in any way to the thread take-off tube 12 or another tubular member. In order not to have to comply with too tight tolerances, it is provided according to FIG. B. by a quickly releasable snap or clip connection 120, is connected to the thread take-off tube 12 or some other tubular member. To improve the hold of the mouthpiece 7, this can additionally - or instead - be connected in an analogous manner (i.e. with the aid of a releasable latching or clip connection 110) to the cover 10 or 11.

Claims (30)

1. Spinning or twisting device with a tubular member which can be subjected to negative pressure, in the bore of which a thread can be returned, and with a feeder movable over the tubular member into a thread insertion position, characterized in that the movement path (54) of the feeder (5 ) facing end of the tubular member (12) has a mouthpiece (7) which, with respect to the bore (72) of the tubular member (12) on its side facing the thread insertion position of the feeder (5), has a thread support (71) and on it has a thread insertion groove (70) oriented in the direction of movement of the feeder (5), the bottom (700) of which is at a greater distance from the path of movement (54) of the feeder (5) than the thread support (71). 2. Device according to claim 1, characterized in that the thread insertion groove (70) over a convex surface in the bore (72) of the tubular member (12). 3. Device according to claim 1 or 2, characterized in that the radii of the edges (73, 74) deflecting the thread (23) are between 0.5 and 1.5 mm. 4. The device according to one or more of claims 1 to 3, characterized in that the thread insertion groove (70) has a length which is at least as large as the length of the thread end (350) protruding beyond the thread support (71) in the thread insertion position of the feeder (5). 5. The device according to one or more of claims 1 to 4, characterized in that the thread insertion groove (70) has a concavely curved bottom (700) which is substantially concentric to the end of the thread support (71) facing the thread insertion groove (70) . 6. The device according to one or more of claims 1 to 5, characterized in that the thread insertion groove (70) - in relation to the movement of the feeder (5) into its thread insertion position - a thread guide feeding the thread end (350) of the thread insertion groove (70) (76) is connected upstream. 7. The device according to claim 6, characterized in that the mouthpiece (7) on its side facing away from the feeder (5) in the thread insertion position has one of the thread insertion groove (70) upstream wall (760) which is in the extends essentially transversely to the movement path (54) of the feeder (5) and in which the thread guide (76) is designed as a notch (761). 8. The device according to claim 7, characterized in that the feeder (5) on its mouthpiece (7) facing side has a guide (55) whose maximum outer width (Wa) is smaller than the maximum inner or clear width (Wi ) of the notch (761) and which can be moved through the notch (761) during the movement of the feeder (5) into its thread insertion position. 9. The device according to claim 7 or 8, wherein the feeder is pivotable about a pivot axis which is arranged substantially parallel to the end of the tubular member carrying the mouthpiece, characterized in that the notch (761) is asymmetrically formed such that their imaginary center line (g) approaches the pivot axis (52) with increasing distance from the movement path (54) of the feeder (5). 10. The device according to claim 9, characterized in that the pivot axis (52) of the feeder (5) facing edge (768) of the notch (761) with the plane of movement of the feeder (5) includes an angle (α) which - from measured from the inside of the notch (761) - not less than 85 °. 11. The device according to claim 10, characterized in that the angle (α) is greater than 90 °. 12. The device according to one or more of claims 9 to 11, characterized in that the pivot axis (52) of the feeder (5) facing edge (768) of the notch (761) is undercut. 13. The device according to one or more of claims 6 to 12, characterized in that the thread guide (76) is designed as a guide groove (767) which extends along the path of movement of the feeder (5). 14. The apparatus according to claim 13, characterized in that the guide groove (767) on its the thread insertion position of the feeder (5) facing away from an extension (765). 15. The apparatus according to claim 13 or 14, characterized in that the guide groove (767) has a bottom (766) which abge on its the thread insertion position of the feeder (5) facing side has a smaller distance from its path of movement (54) than on its side facing the thread insertion position. 16. The apparatus according to claim 15, characterized in that the bottom (766) of the guide groove (767) substantially along the imaginary connecting line (y) between the thread insertion position of the feeder (5) facing away from the end of the guide groove (767) and the Movement path (54) of the feeder (5) facing the mouth of the tubular member (12) extends. 17. The device one or more of claims 13 to 16, characterized in that the guide groove (767) extends beyond the thread insertion groove (70) in the direction of the feeder (5) located in the thread insertion position and the thread support (71) part this guide groove (767). 18. The device according to one or more of claims 6 to 17, wherein the feeder is pivotable about a pivot axis which is arranged substantially parallel to the end of the tubular member carrying the mouthpiece, characterized in that that facing the thread insertion groove (70) The end of the thread guide (76) upstream of the thread insertion groove (70) is located at a greater distance from the pivot axis (52) of the feeder (5) than the end of the thread insertion groove (70) facing the thread guide (76). 19. The apparatus according to claim 18, characterized in that the connecting line (350) between the thread guide (76) and feeder (5) through the one of the movement path (54) of the feeder (5) facing end of the tubular member (12) and the thread insertion groove (70) laid area (e) in the area of the thread insertion groove (70). 20. The device according to one or more of claims 6 to 19, wherein the feeder is pivotable about a pivot axis which is arranged substantially parallel to the end of the tubular member carrying the mouthpiece, characterized in that the thread insertion groove (70) connected upstream Thread guide (76) carries, on its side facing the pivot axis (52) of the feeder (5), an elastic or elastically supported element (763) extending to the movement path (54) of the feeder (5). 21. The device according to one or more of claims 1 to 20, characterized in that the mouthpiece (7) has a recess (75) with a lateral opening (751) through which the free end of a pivotable thread sensor (9) in the recess (75) extends into the bottom (750) of which the thread insertion groove (70) is provided and which extends in the direction of the thread support (71) beyond the bore (72) of the tubular member (12) and between the bore (72) and thread support (71) receives the thread sensor (9), the recess (75) with respect to the Thread support (71) has a depth (h) which is greater than the sum of the thickness or diameter (d) of the thread sensor and its distance (a) from the bottom (750) of the recess (75). 22. Device according to claims 13 and 21, characterized in that the recess (75) is formed like a chamber and on its side facing the movement path (54) of the feeder (5) is covered by a wall (78) which is characterized by the the guide groove (767) extending on both sides of the thread insertion groove (70) is cut through. 23. The device according to one or more of claims 13 to 22, characterized in that the mouthpiece (7) has a cover (6) is deliverable. 24. The device according to claim 23, characterized in that the cover (6) by the feeder (5) is controllable depending on its position. 25. The device according to one or more of claims 1 to 24, characterized in that the thread support (71) of the mouthpiece (7) is designed as a clamping element, which is a substantially parallel to the movement path (54) of the feeder (5) movable clamping element ( 710) is deliverable. 26. The device according to one or more of claims 1 to 25, characterized in that the thread insertion groove (70) receiving part (77) of the mouthpiece (7) consists of statically non-chargeable plastic. 27. The device according to one or more of claims 1 to 26, characterized in that the mouthpiece (7) is positively connected to the tubular member (12) and / or a cover (6) covering the tubular member (12). 28. The apparatus according to claim 27, characterized in that the mouthpiece (7) is connected by means of a latching connection (120, 110) to the tubular member (12) and / or a cover (10, 11) covering the spinning or twisting device. 29. The device according to one or more of claims 1 to 28, characterized in that the spinning device is designed as an open-end spinning device and the tubular member as a thread take-off tube (12). 30. The device according to one or more of claims 1 to 29, characterized in that the tubular member is part of a pneumatic swirl member.

Images