EP0430132B1 - False twist crimping machine for crimping synthetic yarns - Google Patents

Description

The invention relates to a false twist crimping machine for crimping synthetic threads according to the preamble of claim 3 and a method for applying the thread to a thread twist crimping machine.

This machine is known from DE 38 01 506 A1. Even with the known machine - such as described in DE 38 01 506 A1 - arranged at a distance from the heating rail thread guide, in which the thread is inserted for threading. These thread guides define an intermediate layer of the thread run, in which the thread is guided without contact with the heating rail.

The known devices are very well suited when the heating rail faces the operating side. However, machines of this type have also become known from DE 38 01 506 A1, in which the heating rail faces away from the operating aisle, so that the thread is difficult to put on.

The object of the invention is to make the methods and devices for applying the thread to the heating rail so user-friendly that they also allow thread application and in particular to such heating rails which face away from the operator side.

The solution to the problem results from the characteristics of claims 1 and 3.

The principle of the solution is to use the heater cover to guide the thread when threading it. For this purpose, the thread guides are attached to the heater cover. When the heater is closed, the thread is guided in an intermediate thread path by stationary thread guides, which are upstream and downstream of the heating rail and are flush with the heating rail, and by the thread guides attached to the heater cover. In this intermediate thread run, the thread can already be inserted into the false twister and into the delivery plant downstream of the false twister, both of which are in operation, and can thus be conveyed and twisted.
By opening the heater, the thread is released for placement on the heating rail. Then the supplying plant upstream of the heater is inserted and operation is started.

With this method and this device, the thread can be placed on the heater facing away from the operating side and at the same time the processing point can be put into operation.

The particular advantage of the invention is that the lid does not have to be opened in order to bring the thread into the intermediate thread path, in which the thread lies at a distance from the heating rail. Rather, the lid is only opened when the thread is in the intermediate thread path, i.e. runs essentially parallel to the heating rail. It is therefore only necessary to open the heater for a very short time.

For sensitive threads, the method according to claim 2 is recommended. Such sensitive threads are, in particular, non-drawn or only pre-oriented threads (POY), which have to be finally drawn during the false twist texturing. With the method according to claim 2, the thread is already set in motion and false-twisted and thereby subjected to only a slight warming. For this purpose, the cover is divided into partial lengths, of which a partial length can be opened such that the thread falls over this partial length onto the heating rail and touches the heating rail there. It is preferably a partial length at the beginning of the heater. Only after this "preheating" is the thread placed under its operating voltage and drawing is initiated. Then the thread can also endure the heating through the total length of the heater and the remaining part lengths of the lid are opened.

In order to bring the thread into its path parallel to the heating rail, the thread guides are open on the side facing away from the heating rail (outside). There are various possible solutions for unloading the thread from the thread guides. A preferred and essential feature of this invention is that this unloading takes place synchronously with the opening and preferably by opening the heater cover.

By pivoting or tilting the cover around an axis parallel to the heating rail (claim 4), the thread can e.g. be thrown by the thread guides. The running surfaces of the thread guides are straight or slightly trough-shaped. The running surfaces protrude so far that the falling thread falls into the heating rail.

With this solution, however, the lid must also perform a lateral movement in addition to the pivoting or tilting movement in order to effect the opening. As already mentioned, however, it is a preferred aim of this application to design the lid and thread guide in such a way that the opening movement also simultaneously represents the movement necessary for unloading. Such a preferred solution results from claim 5. This solution can then be used in particular if double heaters are used. There are two parallel grooves for one thread each in a heating rail. The heater lid is divided in the middle plane between these two grooves, and each half can be opened separately. The thread guides consist of several pairs of edges arranged close to each other, which intersect and form a V-shaped gap on the outside of the cover for the thread guide. One of the edges is attached to each cover half. When opening by pivoting or laterally shifting the lid half, the edge attached to it acts as a supporting edge, which loses its support function when the lid half is opened. The edge on the other half of the cover acts as a fixed sliding edge on which the thread slides. Since the sliding edge ends essentially above the vertical central plane of the open heater groove, the thread then falls into this heater groove. In the case of a pivotable cover, the sliding or supporting edges are curved, the center of curvature lying essentially in the pivot axis of the pivotable cover half assigned to them.

This solution has the advantage that it is possible for both tiltable and laterally movable covers. Lids that can be moved laterally have the advantage that they can be adapted to the curvature of the heating rail. A solution suitable for laterally displaceable covers results from claim 8. The thread can be thrown off the thread guides by laterally displacing the cover by means of an additional ejection device which remains stationary when the cover is displaced laterally and engages behind the thread.

The cleaning of the cooling rail is conducive to the embodiment according to claim 9 when the thread is unloaded by tilting the thread guides (claim 4).

The problem of providing a constant distance over the length of the heating rail between the heating rail and the cover surface facing it can be solved with each displaceable design, by the cover being curved in accordance with the heater curvature (claim 10).

In order to be able to adapt the lid to the strong curvature of the heating rail, the lid is divided into sectors (claim 11). When threading sensitive threads, e.g. made of polyester, it is advisable to preheat the thread slightly. For this purpose, the embodiment according to claim 12 is used, whereby the division of the cover into sectors ensures that the thread only touches the heating rail for a short distance, and thermal damage to the thread to be applied is ruled out until it is finally drawn.

To apply the thread to the thread guides, a cable pull guided over the thread guides, to which a thread driver is attached (similar to DE-PS 2 455 117), a piston movable in an air-guiding tube, which has a driving arm for the thread (DE-PS 2 454 668), an air-guiding, slotted tube in which the thread is conveyed (DE-PS 2 429 722) or DE 4021695 A1).

Exemplary embodiments of the invention are described below.

Fig. 1

den Querschnitt durch ein erstes Ausführungsbeispiel mit translatorisch verschiebbarem Deckel;

Fig. 2

den Querschnitt (teilweise durch ein zweites Ausführungsbeispiel mit verschwenkbarem Deckel);

Fig. 3

den Querschnitt (teilweise) durch ein drittes Ausführungsbeispiel mit in Längsrichtung geteiltem Deckel und schwenkbaren Deckelhälften;

Fig. 4

den Querschnitt durch eine Bearbeitungsstelle einer Falschzwirnkräuselmaschine.

Show it:

Fig. 1

the cross section through a first embodiment with translationally displaceable cover;

Fig. 2

the cross section (partly through a second embodiment with a pivotable lid);

Fig. 3

the cross section (partially) through a third embodiment with the lid divided in the longitudinal direction and pivotable lid halves;

Fig. 4

the cross section through a processing point of a false twist crimping machine.

A heating device with a heating rail 2 is shown in all exemplary embodiments. The heating rail has two thread running grooves 3. It should be noted that the heaters with all devices are symmetrical to their longitudinal direction, i.e. to their middle level. The mirror plane is thus centrally between the two grooves 3. The heating rail 2 is a hollow profile which is filled with a heat-transferring liquid or a heat-transferring vapor and hermetically sealed. In the exemplary embodiments shown, a surface of the heating rail is designed to be wavy in such a way that two thread running grooves 3 are formed. The heating rail is inserted into the shaft 5 of an insulating box 4, which is rectangular in cross section. The insulating box thus surrounds the heating rail 2 on three sides. The thread running grooves 3, however, are directed to the outside of the shaft 5. The shaft 5 is closed on the outside by a cover 6. The cover 6 is divided in the longitudinal direction in the central plane between the two grooves 3. This creates two cover halves 6.1, 6.2, which can be opened.

In the embodiment of FIG. 1, the two covers 6 are translationally movable perpendicular to the longitudinal direction of the heating rail 2. For this purpose, the cover 6 are guided on the top 7 of the insulating box 4. A wedge 8 attached to the insulating box 4 and a groove 9 on the underside of the cover serve for straight guidance. A pivot lever 10, which is fastened to a pivot rod 13 and which engages with its free end with sliding block 11 in a sliding block guide 12 on the top of the cover, is used to drive the cover. The pivot rod 13 can be pivoted by handle 14.

On the top of each cover 6, a plurality of thread guides 15 are attached in the longitudinal direction. Each thread guide 15 has a sliding edge inclined towards the mirror plane. The sliding edge ends in a depression in the area of the mirror plane. In this trough, fixedly attached ejection thread guides 16. Each ejection thread guide 16 has an end for this, which forms an acute angle with the sliding edge of the thread guide 15 and is so short that the thread sliding on the sliding edge can slide away under the end of the ejection thread guide 16 in the hollow. The thread guides 15 and the ejection thread guides 16 are offset from one another in the longitudinal direction and are at a distance from one another. The end of the ejection thread guide 16 protrudes only a short distance below the sliding edge of the thread guide 15.

Able thread guides 17 are arranged above the sliding edges of the thread guides 15. A tube 18 in which a piston 19 is movable is shown as the thread guide 17 in FIG. 1. The tube 18 spans the entire length of the heater. The tube 18 has a longitudinal slot and the piston 19 has an arm 20 protruding from the longitudinal slot. The tube can be pressurized with compressed air via connecting pieces 21. A thread 1 can be attached to the arm 20.

It should be noted that other thread guides 17, e.g. the thread guide described below in connection with FIG. 2 can be used.

About the function:
For thread application, the piston 19 is brought into the area of the input side of the heating rail and the thread is fastened to the arm 20 by means of a loop. Then the tube is pressurized with compressed air so that the piston 19 moves to its other end position. The arm 20 takes the thread 1 with and places it on the inclined sliding edge of the thread guide 15. By applying the thread to the feed mechanisms, which are connected upstream and downstream of the heater, the thread 1 comes under thread tension and now slides on the inclined sliding edge of the thread guide 15. It gets into the wedge gap which the inclined sliding edge of the thread guide 15 and the end of the ejection thread guide 16 form together. The thread can dip away under the end of the ejection thread guide 16 and thus get into the trough of the thread guide 15 due to its tensile force. Here the two threads now run without contact with the heating rail 2. The two threads 1 can now be put on by moving the two covers 6. For this purpose, the pivot lever 10 is pivoted. As a result, the two covers perform a movement essentially perpendicular to the mirror plane. As a result, the two threads 1 hang behind the hook-shaped projecting ends of the ejection thread guides 16. They are pushed over the ends of the thread guide 15 and then fall down. Since the ejection thread guides 16, against which the threads rest, are arranged substantially vertically above the thread grooves 3, the threads fall into the gap that opens between the covers 6 and into the thread grooves 3. The covers can be brought back into their closed position . The whole process of opening and threading takes only fractions of a second, so that the heat losses are very low.

In the embodiment shown in Figure 2, the two covers 6 are pivotally mounted. The double hinge lever 23 is used for this purpose. The double hinge lever 23 has a fixed lever 24 which is fastened to an outer wall of the insulating box 4. An intermediate lever is connected to the fixed lever 24 by the first joint 25. This intermediate lever lies on the top 7 of the insulating box 4. The intermediate lever is connected by the second joint 26 to the cover lever 27 attached to the cover 6. The two Joints 25 and 26 each lie on the corners of the profile of the insulating box 4.
On the top of the cover facing away from the heating rail 2, a plurality of thread guides 15 are fastened in the longitudinal direction. These thread guides have a sliding edge that ends in a hollow in the area of the central plane of the heating rail (this is also the symmetry or mirror plane of the entire device). In its operating position, each cover 6 is locked in such a way that the cover with the thread guides 15 thereon is inclined toward the central plane of the heating rail.

Thread feed devices 17 are arranged above the two covers. In the exemplary embodiment according to FIG. 2, an air-guiding tube 18 is shown, which has a slot over its entire length 22. The tube extends over the entire length of the heating rail. The tube is movable on a guide rod 30 perpendicular to the central plane of the heating rail, so that it does not hinder the pivoting movement of the cover, which is described below.

About the function:
The covers 6 are in their closed position.
For thread application, the thread is placed in the area of the thread inlet of the heating rail on the tube 18 and conveyed by the air flow generated in the tube 18 to the opposite end of the tube 18 and the heating rail. The thread falls out of the slot 22 as a result of the thread tension that arises and onto the thread guide 15. The thread slides on the sliding edge of the thread guide 15, which is inclined in the locked position, down into the trough. If both threads run in their trough, the right cover 6 in FIG. 2 is pivoted counterclockwise and the other cover 6, which is only partially shown, is pivoted clockwise. In order to enable this pivoting movement, the insulating shaft 5 is somewhat deeper here than in the exemplary embodiment according to FIG. 1 shown. Its depth corresponds to approximately half the width of the lid. This pivoting movement also tilts the thread guide 15 into the unloading position 28 shown in broken lines. Since the end of the thread guide 15 is so long that in the upturned position it lies essentially vertically above one of the running grooves 3, each thread is unloaded into the running groove belonging to it. The covers 6 can now be closed again by pivoting them back into the position shown in the solid state.

In addition, it is also possible to open the cover 6 so completely that the heating rail can be cleaned. For this purpose, the thread insertion devices 17 are moved a little on the guide rod 30 so that they do not prevent the pivoting movement of the cover. Now each cover half 6 can be pivoted about the first joint 25 into the cleaning position shown in dashed lines at 29.

In the embodiment of FIG. 3, the cover 6 is also divided in the middle plane between the two grooves 3.1 and 3.2. This creates two cover halves 6.1 and 6.2. Each of the lid halves is pivotally mounted in one or more hinges. As a result, each of the cover halves 6.1 and 6.2 can be opened independently of the other in such a way that the shaft 5 is exposed over one of the running grooves 3.1 and 3.2. Pairs of strips 15.1 and 15.2 are fastened to the two cover halves 6.1, 6.2, namely a strip 15.1 on the left cover half 6.1 and another strip 15.2 on the right cover half 6.2 of each pair. The strips cross and form - when viewed in the thread run - a V, the apex of which lies in the middle plane between the two thread run grooves 3.1 and 3.2 and which is open at the top, ie on the side facing away from the heating rail.

Otherwise, each of the strips 15.1, 15.2 also extends beyond the apex of the V, to the middle plane, through the bottom of one of the grooves 3.1, 3.2. Thus, the strip 15.1, which is attached to the left half of the cover 6.1 extends beyond the apex of the V to the middle plane, through the right thread running groove 3.2. The other bar 15.2, which is fastened to the right half of the cover 6.2, extends to the middle plane through the left thread running groove 3.1. It should be added that each of the edges is sloping from the beginning of the opening of the V to its end towards the heating rail. In addition, the strips 15.1, 15.2 are curved, the center of curvature being approximately in the pivot axis of the respective hinges of the associated cover halves 6.1 and 6.2.

Thread feed devices 17 are arranged above and in the middle between two adjacent heating devices. In the exemplary embodiment according to FIG. 3, an air-guiding tube 18 is shown, which has a slot 22 over its entire length. The tube extends over the entire length of the heating rail. The tube has a compressed air connection 21 at both ends. A piston 19 is movable in the tube. The piston 19 is displaced in the tube by supplying compressed air to one or the other end of the tube. An arm 20 is attached to the piston 19 and projects through the slot 22 to the outside. The double arm 32 is attached to the free end of the arm 20. A clamping device 33 for the thread is attached to each free end of the double arm 32. A clamping plate 34 is shown in FIG. 3, the bottom of which is pressed against the end of the double arm 32 by a spring 35. The thread can be pulled under the plate bottom by wrapping the plate edge. The double arm 32 is so long that it projects above the opening of the V formed by the strips 15.1, 15.2.

About the function:
When threading, the two cover halves 6.1 and 6.2 are closed. By means of a thread application device - in FIG. 3 the right thread application device - two threads are placed on two adjacent heaters. For this purpose, the thread coming from a supply spool is looped with its end around the plate edge of the plate 34 and thereby clamped in the clamping device 33. Now the piston 19 is displaced by supplying compressed air in the pipe 18 from the inlet end of the heater to the outlet end of the heater. As a result, the thread fastened in the clamping device is deposited in the V-shaped base of the crossing strips 15.1 / 15.2. Furthermore, the thread is inserted over the subsequent cooling rail and into the subsequent false twister and is pulled off by a suction gun. Now the feeder upstream of the heater can be inserted and the thread can be conveyed and twisted. The right cover half 6.2 shown in FIG. 3 is now opened, while the left cover half remains closed. The movement which the bar 15.2 executes can be seen from the dashed end position of the bar 15.1 of the left half of the lid 6.1. For better clarity, it was not shown for the right half of the cover. If the strip 15.2 is pivoted away to the right in a corresponding manner by opening the cover 6.2, the V-shaped bottom of the intersecting strips 15.1, 15.2 on the fixed strip 15.1 moves downward in the direction of the heating rail. The strip 15.1 is now shaped so that its end facing the heating rail is essentially in the central plane of the thread running groove 3.2. The thread therefore slides on the bar 15.2 (sliding edge), while the other bar 15.1, which remains stationary, retains its supporting function (supporting edge). As soon as the bar 15.2 is pivoted so far that it no longer crosses the other bar 15.1, the thread falls downward in the direction of the heating rail, namely into the right thread running groove 3.2. Because the heater can be opened in sectors, the thread is first brought into contact with the heating rail only over a partial length. Now the delivery mechanism downstream of the false twister can be introduced and the stretching and false twisting of the thread can thereby be started. Then the remaining heater sections are opened. The thread can now be placed on the left thread running groove 3.1 and on the heating device adjacent to the left. Prior to this, the piston 19 is returned to its starting position in the region of the thread inlet of the heating device by opposing pressurized air. Furthermore, the cover half 6.2 is closed again. The advantage here is that only one half of the shaft 5 has to be opened in each case. As a result, heat losses can be kept low.

4, the method for threading the processing point of a false twist crimping machine is described in particular. To carry out the method, the heater 2 is provided with a three-part cover. The cover section 6.1 can be opened by means of the operating rod 10.1 independently of the other two sectors 6.2 and 6.3. An operating rod 10.2 is used to operate the two sections 6.2 and 6.3. Sections 6.2 and 6.3 are interconnected so that they can be opened together. For this, reference is made to DE-PS 38 13 133. The rest of the parts are conventional.

All sections of the lid are closed for threading. The thread is removed from the supply spool 36 and connected to the arm 20 by a clamping device 33 (see, for example, FIG. 3) or in some other way. The piston 19, to which the arm 20 is attached, is still located on the left end of the tube 18 in the region of the first delivery mechanism 38. After the thread 20 has been clamped or fastened to the arm 20, the piston is moved into the right position, which is drawn in Fig. 4, shot. As a result, the thread is placed over the thread guides 15.1, 15.2, 15.3, which are fastened on the outer sides of the cover sections 6.1, 6.2, 6.3, and then over the cooling rail 39. When the piston 19 has arrived at the right end of the tube, the thread is removed by means of a suction gun 42 and placed in the friction false twister 40 and in the following delivery mechanism 41. The delivery mechanism 41 is now closed and the false twister is put into operation. The false twister is a device as shown in EP-B 22743 = US-PS 4,339,915. The delivery plant 38 in front of the heating device is still open.

Now the first section 6.1 of the lid is opened by means of a handle 10.1. As a result, the thread falls from the outside of the cover and comes into contact with part of the heating rail 2. The thread runs from the thread guide 37, which is located at the entrance of the heating rail, to the first thread guide 15.2 on the cover section 6.2. However, the contact length is only very short. Therefore, the thread drawn from the supply bobbin 36 without intervention of the delivery mechanism 38 is slightly heated by the delivery mechanism 41. However, the thread has not yet reached its final stretch because the delivery mechanism 38 is not yet in engagement. Therefore, the thread is still drawn off as a waste by suction gun 42. The first delivery unit 38 can now be inserted. This gives the thread the desired stretch. Now, however, the other two cover sections 6.2 and 6.3 are also opened by moving the operating rod 10.2. As a result, the thread falls over the entire length of the heating rail 2. All cover sections are closed. The thread is now applied to the traversing device 43 and to the empty sleeve 44, which is already set in rotation by the drive roller 45.

Claims (12)

1. Method of applying a yarn (1) onto the curved heating rail (2), which is closable by a lid (6), of a false twist crimping machine, wherein the yarn (1) is first moved into an intermediate yarn run, which accompanies the heating rail (2) at a distance, and is then, with the lid (6) open, brought into contact with the heating rail (2), whereupon the lid (6) is closed,
   characterized in that
   for guiding the yarn (1) in the intermediate yarn run the yarn (1) is supported on the outside of the closed lid (6) by the yarn guides (15) and for application onto the heating rail (2) is dropped, as a result of opening of the lid (6), from the yarn guides (15) disposed on the outside of the lid substantially vertically above the heating rail (2).
2. Method according to claim 1,
   characterized in that
   the lid (6) is subdivided into part-lengths (6.1, 6.2, 6.3) and is initially opened only partially in such a way that the yarn (1) comes into contact with part of the heating rail (2).
3. False twist crimping machine for crimping synthetic yarns (1),
   in which each processing point comprises a feed spool (36), a delivery mechanism (38), a curved heating rail (2), a cooling rail (39), a false twister (40), a withdrawal mechanism (41) and a winding device (44, 45), the curved heating rail (2) being closable by a lid (6) which extends in a longitudinal direction of the heating rail (2),
   and in which yarn guides (15) are disposed above the heating rail (2) in such a number and at such a distance from the heating rail (2) that the yarn (1) may be conveyed in an intermediate yarn run without contact with the heating rail (2),
   characterized in that
   the lid (6) for opening is so guided and the yarn guides (15) are so fashioned and connected to the lid (6) that the yarn (1), when the lid (6) is closed, is conveyed in the plane of the intermediate run at the side (outside) remote from the heating rail (2) over the lid (6) and, as a result of opening of the lid (6), positively drops from the yarn guides (15).
4. Machine according to claim 3,
   characterized in that
   the yarn guides (15) are fastened to the outside of the lid (6) and the running surfaces of the yarn guides (15) are open at the side remote from the heating rail (2), and that the lid (6) may be swivelled or tilted in such a way that, during opening, the yarn (1) slides down laterally at right angles to its running direction on the running surface, the end of the running surface lying above the heating rail (2) in the open state of the lid (6).
5. Machine according to claim 3,
   characterized in that
   the yarn guides (15) comprise pairs of two edges (sliding edge and supporting edge), which succeed one another in yarn running direction and - in projection onto a plane at right angles to the yarn run - intersect, that, of each pair, one edge (sliding edge) opens out substantially in the running plane extending through the heating rail (2),
   and the other edge (supporting edge) is fastened to the lid (6) in such a way that it loses its supporting function on opening of the lid (6), while the sliding edge remains stationary during application of the yarn (1).
6. Machine according to claim 5,
   characterized in that
   the heating rail (2) has two parallel adjacent channels (3) for guiding in each case one yarn (1), that the lid (6) is subdivided in a longitudinal direction substantially in the centre plane between the two channels (3), that each of the two lid halves (6) is capable of moving, e.g. swivelling, outwards and has pairs of sliding and supporting edges which succeed one another in the yarn run,
   that the sliding/supporting edge of one lid half (6) terminates substantially in the running plane, which extends through the heating rail (2) situated under the other lid half (6).
7. Machine according to claim 6,
   characterized in that
   the sliding/supporting edges are curved, with the centre of curvature lying substantially in the swivelling axis of the lid half (6) associated with said edges.
8. Machine according to claim 3,
   characterized in that
   the lid (6) for opening is laterally displaceable, and that the yarn guides (15) have upwardly open running surfaces,
   and that ejection devices (16), which are disposed vertically above the heating rail (2), are associated with the running surfaces.
9. Machine according to claim 4,
   characterized in that
   the lid (6) may be swivelled about two joints (25, 26), which have joint axes substantially parallel to the heating rail (2), in such a way that the lid may be tilted towards the heating rail (2) and swung open in the direction remote from the heating rail (2).
10. Machine according to one of claims 3 to 9,
    characterized in that
    the lid (6) is curved with the same curvature as the heating rail (2).
11. Machine according to one of claims 3 to 10,
    characterized in that
    the lid (6) is subdivided in a longitudinal direction into sectors (6.1, 6.2, 6.3).
12. Machine according to claim 11,
    characterized in that
    the sector (6.1) situated at the yarn input or the sectors adjacent to the yarn input are openable before the other sectors (6.2, 6.3).

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