JP6566969B2 - Device for drawing and drawing synthetic yarns - Google Patents

Description

  The present invention relates to an apparatus for drawing and drawing synthetic yarns in a melt spinning process of the type described in the superordinate conception of claim 1.

  During the production of synthetic yarns, the freshly extruded yarn is usually cooled and then drawn and drawn by a plurality of godets, after which the yarn is wound on a winding tube at the end of the process. In this case, it is advantageous if the yarn is heated on the circumference of the godet in order to keep the yarn material as plastic as possible for drawing. For this purpose, the yarn is guided in direct contact with the peripheral surface of the godet, so that the yarn material can be heated to a predefined drawing temperature. Such an apparatus for drawing out and drawing a group of synthetic yarns is known, for example, from WO 2011009497 (WO2011009497A1).

  In known devices, a plurality of godets are held protruding from a support. In this case, the yarn group is guided by being partially wound on the circumferential surface of the godet. In practice, it was observed that the surface was contaminated, especially in the area of the thread guide on the circumference of the godet. This contamination consists, for example, of oil residues or polymer wear powder. However, such contamination can affect the heat treatment of the yarn at long operating times. To that extent, it is known to clean the godet surface with a defined time cycle. However, such a cleaning operation basically has the disadvantage that the yarn production process has to be interrupted.

  The object of the present invention is therefore to achieve as long an operating time as possible without any additional cleaning work on the godet surface in the apparatus mentioned at the outset for drawing and stretching the group of synthetic yarns.

  This problem is solved according to the invention by the features of claim 1.

  Advantageous embodiments of the invention are formed by the features described in the dependent claims and combinations of the features.

  The invention is also not easily conceived from a device known from DE 10114368 A1 (DE10114368A1). In a so-called clamp conveying unit (Klemmlieferwerken) in a textile machine, the yarn is reciprocally guided so as to swing in a transverse direction perpendicular to the yarn traveling direction before it rides on the conveying roller. It is normal for the landing point to change continuously. Accordingly, uniform surface wear of the transport roller is achieved.

  However, such a wobbling movement of the yarn cannot be realized during the drawing and drawing of the synthetic yarn in the melt spinning process. The constant movement of the yarn group leads to an unstable running of the yarns guided in parallel in a known manner at a relatively small distance on the circumference of the godet.

  In contrast, the present invention has the special advantage that the yarns of the yarn group are always guided by a stationary yarn guide. In order to selectively adjust the yarn supply exclusively on the peripheral surface of the godet, the yarn guide strip and / or the yarn guide are formed to be movable in the axial direction of the godet. The movement of the yarn guide strip or the yarn guide can be carried out, for example, during a normal process interruption, for example for cleaning the spinning nozzle or at the time of yarn breakage. As long as this is the case, stable yarn traveling for drawing and stretching is guaranteed on the peripheral surface of the godet. However, by selective adjustment of the yarn supply at the surface of the godet, the yarn can be selectively guided in multiple mantle zones on the circumferential surface of the godet. Thus, the operating time in which the yarn can be guided and treated on the circumference of the godet without significant damage due to contamination is extended.

  In order to keep the mechanical effort for moving the yarn guide strip or the yarn guide as small as possible, the yarn guide strip and / or the yarn guide can be reciprocated between an outer position and an inner position, respectively. Variations of the invention are advantageously implemented. Thus, a doubling of the operating time can already occur by causing a predefined deviation between the yarn guide positions.

  In this case, the movement stroke extending between the yarn guide strip or the outer position of the yarn guide and the inner position of the yarn guide strip or the yarn guide is formed smaller than the distance between two adjacent yarn guides. And is advantageous. As a result, it is assured that no superimposition of the yarn traveling track (Fadenspuren) occurs on the peripheral surface of the godet.

  The yarn guide strip is preferably held on the support plate for movement. The support plate is arranged at one free end of the movable piston. This allows the yarn group to be repositioned during a position adjustment cycle by movement of the piston.

  The piston is guided in the casing for movement of the support plate and is movable between an outer position and an inner position.

  In this case, the movement is advantageously performed as follows according to the variant of the invention. That is, the piston provided with the end flange is guided in the stepped hole and is tightened between the spring and the pressure chamber formed at the end of the stepped hole. In this case, the pressure chamber can be connected to a compressed air source via an air connection and a control valve.

  For the movement of the piston, the control valve is connected to a control device. With this control device, the pressure chamber is supplied with air or exhausted from the pressure chamber while the process is interrupted or after a predetermined time interval.

  When entering the godet, there is usually a cutting point between the spinning device and the processing device that completely cuts the yarn group when the yarn breaks and guides it together to the waste container to maintain the extrusion process. Therefore, a variant of the invention is advantageously implemented in which the wefting device for cutting and collecting the yarns of the yarn group is held on the support plate. Therefore, the yarn group can be collected and sucked in the same conditions at the time of yarn breakage at each location of the yarn guide strip.

  In order to move the yarn guide, it is specified that the yarn guide is disposed on the sliding shoe. The sliding shoe is guided in the sliding guide portion of the yarn guide strip. As a result, the yarn guide can alternatively change the yarn supply even when the yarn guide strip is stationary.

  Alternatively, however, there is also the possibility of both systems cooperating, so that movement of the yarn guide or movement of the yarn guide strip can be used to change the yarn supply on the circumference of the godet. This alternative embodiment is advantageously selected when the yarn spacing between adjacent yarns is large, so that one region of the godet's peripheral surface between the two yarns is shifted multiple times. Enabled by.

  The invention will now be described in detail with reference to the accompanying drawings, with reference to the accompanying drawings, for several embodiments of an apparatus according to the invention for drawing and drawing synthetic yarn groups.

1 is a schematic front view showing a first embodiment of an apparatus according to the present invention. It is a schematic side view of 1st Embodiment in the area | region of the entering side of a godet. It is the top view seen from the top which shows the thread | guide guide strip of embodiment shown in FIG. 1 schematically in a some driving | running state. It is the top view seen from the top which shows the thread | guide guide strip of embodiment shown in FIG. 1 schematically in a some driving | running state. It is a schematic front view which shows another embodiment of the apparatus which concerns on this invention. It is a schematic cross-sectional view showing the upper region of the yarn guide strip in various operating states. It is a schematic cross-sectional view showing the upper region of the yarn guide strip in various operating states.

  FIGS. 1 to 3 show, from a plurality of viewpoints, how the first embodiment of the apparatus according to the present invention for pulling out and stretching a synthetic yarn group can be used, for example, in a melt spinning apparatus. It is shown in the figure. 1 is a front view, FIG. 2 is a side view in the region of the yarn supply section, and FIGS. 3.1 and 3.2 are plan views of the yarn entry guide as viewed from above. The following description applies to all drawings unless explicitly related to one of the drawings.

  FIG. 1 schematically shows a front view of an embodiment of the device according to the invention in the operating state for withdrawing and stretching the yarn group 6. This embodiment has a plurality of godets 4.1 to 4.6. These godets 4.1 to 4.6 are held on the assembly wall 1. The godet jackets (outer peripheral walls) 5.1 to 5.6 driven by the godets 4.1 to 4.6 protrude on the front side of the assembly wall 1. The diameters and properties of the godet mantles 5.1 to 5.6 are different from each other. Accordingly, an unheated godet jacket 5.1 of godet 4.1 is provided in the immediate vicinity of the entry side 10. This unheated godet mantle 5.1 has a smaller diameter than the godet mantle 5.2 of the adjacent godet 4.2. The godets 4.2 to 4.5 are configured with heated godet jackets 5.2 to 5.5. Usually, such heated godets are kept isolated in a godet box. Any speed difference between the individual godets 4.1 to 4.6 can be produced in order to stretch and relax the yarn.

  On the delivery side 29, a godet 4.6 with an unheated godet mantle 5.6 is arranged.

  The arrangement, distribution, and number of godets illustrated in FIG. 1 are exemplary. What is important for the present invention is the supply of the yarn group 6 carried out by the yarn guide strip 2 on the entry side 10 in this embodiment. The yarn guide strip 2 has one separate yarn guide for each yarn of the yarn group 6. For the description of the yarn guide strip 2, reference is additionally made to FIG. 2 and FIGS. 3.1 and 3.2.

  In particular, as can be seen from the drawings in FIGS. 2 and 3.1, a total of four thread guides 3.1 to 3.4 are held on the elongated sliding shoe 7. These thread guides 3.1 to 3.4 are formed in a U shape and are each formed by one ceramic insert 30.

  The sliding shoe 7 is held in the sliding guide 8 of the yarn guide strip 2 and is reciprocated in the axial direction of the godet 4.1 between the inner stopper 9.1 and the outer stopper 9.2. obtain.

  2 and 3.1 show an operating state in which the sliding shoe 7 is applied to the outer stopper 9.2, whereby the yarn guides 3.1 to 3.4 are located at the outer position. Has been. In this position of the yarn guides 3.1 to 3.4, the yarns of the yarn group 6 are fed to a subsequent godet 4.1 in the immediate vicinity of the entry side 10. Since the sliding shoe 7 remains in that position, yarn production with the selected yarn supply to the godets 4.1 to 4.6 is performed.

  For example, when a process interruption occurs due to maintenance or thread breakage, the sliding shoe 7 can be moved in a direction toward the inner stopper 9.1 by manual movement. This state is illustrated in FIG. In FIG. 3.2, the yarn guides 3.1 to 3.4 are located at a relatively inner position relative to the godet 4.1. The movement stroke extending between the outer position of the yarn guide and the inner position of the yarn guide is indicated by the symbol V in FIGS. 2, 3.1 and 3.2. Similarly, the spacing formed between adjacent yarn guides 3.1 and 3.2 is indicated by the reference symbol B. In this case, the travel stroke V is formed smaller than the distance B between the two adjacent yarn guides 3.1 and 3.2. For an optimized use of the surface at the circumference of the godets 4.1 to 4.6, the travel stroke V is preferably a distance B between two adjacent yarn guides 3.1 and 3.2. It is formed in half the size.

  The thread spacing between the thread guides 3.1 to 3.4 is the same in this embodiment. Accordingly, the movement of the yarn guides 3.1 to 3.4 changes the yarn supply by a length that is half the yarn interval in the axial direction of the godet. Therefore, the operating time of the peripheral surfaces of the godets 4.1 to 4.6, especially for heat treatment, can be significantly extended, or undesired disturbing effects due to contamination do not occur at an early point.

  In FIGS. 4, 5.1 and 5.2, another embodiment of the device according to the invention for drawing and stretching a group of synthetic yarns is illustrated from several viewpoints. FIG. 4 shows a schematic front view of this embodiment, in which FIGS. 5.1 and 5.2 each show a cross-section on the supply side of a support plate with attached thread guide strips. It is shown in the figure.

  In the embodiment shown in FIG. 4, a support plate 11 is movably held on the assembly wall 1 on the entry side 10. In the upper region, the support plate 11 is provided with a yarn wetting device (Fadenraffeinrichtung) 12. The yarn wetting device 12 has at least one suction part 13 and a yarn collecting device 14. Such a wefting device 12 is necessary for cutting the yarn and collecting the yarn group when one of the plurality of yarns in the yarn group breaks. Thereby, the yarn continuously pushed out from the melt spinning apparatus can be guided to the waste container via the suction part 13 without interruption.

  A yarn guide strip 2 is arranged below the yarn wetting device 12. The yarn guide strip 2 has a yarn guide for each yarn of the yarn group 6. The construction of the yarn guide strip 2 will be described in more detail below with reference to FIGS. 5.1 and 5.2.

  A plurality of godets 4.1 to 4.6 are arranged in correspondence with the support plate 11 on the assembly wall 1. These godets 4.1 to 4.6 are held on the assembly wall 1 in a shifted arrangement in the present embodiment. The godets 4.1 to 4.6 are configured in the same manner as the embodiment shown in FIG. 1, and project at the front side of the assembly wall 1 with the rotating godet jackets 5.1 to 5.6, respectively. Yes. In this case, basically, the number of unheated godets and the number of heated godets can be changed. Accordingly, there is a possibility that the heated godet is first arranged in correspondence with the yarn guide strip 2 on the entry side 10. However, the godet system and godet arrangement can be freely selected regardless of the present invention.

  In order to be able to selectively adjust the thread supply on the circumferential surface of the godet cannula 5.1 to 5.6, the thread guide strip 2 is positioned on the outside of the assembly wall 1 via the movable support plate 11 or It can be moved to the inner position. FIG. 5.1 shows a cross section of the support plate 11 at the assembly wall 1 with the thread guide strip 2 attached. The yarn guide strip 2 has a total of four yarn guides 3.1 to 3.4. These yarn guides 3.1 to 3.4 are each formed by a U-shaped ceramic insert 30. The number of yarn guides in the yarn guide strip 2 is matched to the number of yarns in the yarn group 6 to be guided. This number is exemplary in the present embodiment.

  The yarn guide strip 2 protrudes and is attached to the support plate 11. The support plate 11 is coupled to the piston 15 via coupling means 16. The piston 15 is slidingly guided in the stepped hole 18 of the casing 19. In this case, the piston 15 has an end flange 17 having an enlarged diameter at the end located on the side opposite to the support plate 11. The end rod 17 of the piston 15 is reciprocally guided in the stepped hole 18 between the outer stopper 9.2 and the inner stopper 9.1. For this purpose, a pressure chamber 23 is formed between the cover 20 that closes the stepped hole 18 and the end surface portion of the end flange 17. The pressure chamber 23 is connected to a control valve 27 via a pressure air connection portion 21 and a pipe line 22. This control valve 27 is connected to a compressed air source 31. In this case, the control valve 27 can be controlled for supplying air to the pressure chamber 23 or exhausting the pressure chamber 23 via the control device 28.

  In the operating state shown in FIG. 5.1, since the air supply to the pressure chamber 23 is performed, the end rod 17 of the piston 15 is applied to the outer stopper 9.2. In this state, in order to supply the yarn group 6 to the subsequent godets 4.1 to 4.6, the yarn guide strip 2 is held at the outer position.

  A spring 24 is disposed on the peripheral surface of the piston 15 on the side opposite to the pressure chamber 23. The spring 24 is tightened between the casing 19 and the end flange 17. Therefore, the piston 15 can be moved by the spring 24 from the outer stopper 9.2 toward the inner stopper 9.1 after exhausting from the pressure chamber 23. This state is illustrated in FIG.

  When exhausted from the pressure chamber 23, the end rod 17 of the piston 15 is abutted against the stopper 9.1. In this case, the stopper 9.1 is formed by the cover 20. Since the piston 15 is moved by the spring 24, the support plate 11 including the yarn guide strip 2 is held at the inner position on the front surface of the assembly wall 1. The movement stroke indicated by the symbol V in FIGS. 5.1 and 5.2 is formed smaller than the distance between the adjacent yarn guides 3.1 to 3.4. The distance between the yarn guides 3.1 to 3.4 is indicated by the symbol B in FIGS. 5.1 and 5.2. During a simple movement between the inner position and the outer position, the movement stroke of the piston 15 is designed to be V = 1 / 2B.

  In this embodiment, the function for changing the yarn supply on the peripheral surfaces of the godets 4.1 to 4.6 is the same as that of the above-described embodiment shown in FIG. To that extent, reference is made to the description relating to the functions described above.

  If the spacing between adjacent yarn guides in the yarn guide strip is relatively large, advantageously both systems shown in the embodiments can also be combined for selective adjustment of the yarn supply. Thus, for example, the yarn guide strip shown in FIG. 5.1 can be replaced by the embodiment shown in FIG. 3.1 of the yarn guide strip. In this case, a total of four positions of the thread guide can be selectively set in order to change the thread supply to the godet.

  It should be emphasized here that the structural configuration of the thread guide strip and thread guide is exemplary. Important to the present invention is to change the yarn supply to the godet on the entry side at relatively large time intervals that may be defined, for example, by maintenance cycles or other process interruptions.

Claims (7)

An apparatus for drawing and drawing a synthetic yarn group (6) in a melt spinning process,
A plurality of driven godets (4.1-4.6) in which the thread group (6) is partially wound around and guided on the circumferential surface;
Threads arranged corresponding to the godets (4.1-4.6) on the entry side (10), which support the thread guides (3.1-3.4) for each thread of the thread group (6) A guide strip (2),
In an apparatus comprising:
The yarn guide strips (2) are have the yarn guide that is formed by a ceramic insert (30) of the U-shaped (3.1-3.4), the godet (4.1-4.6 ) In the axial direction of the godet (4.1-4.6) , the yarn guide strip (2) is Along with the yarn guide (3.1-3.4), it can reciprocate between an outer position and an inner position, the outer position of the yarn guide strip (2), and the yarn guide strip (2). The moving stroke (V) extending between the inner position and the inner position is half of the interval (B) between two adjacent yarn guides (3.1-3.4). An apparatus for drawing and drawing the synthetic yarn group (6) in the process. The yarn guide strip (2) is held in the support plate (11), said support plate (11) is arranged on one of the free ends of the movable piston (15), according to claim 1 The device described. 3. The device according to claim 2 , wherein the piston (15) is guided in a casing (19) and is movable between the outer position and the inner position. The piston (15) provided with the end rod (17) is guided in the stepped hole (18), and is formed at the end of the spring (24) and the stepped hole (18). The pressure chamber (23) is connectable to a compressed air source (31) via an air connection (21) and a control valve (27). 3. The apparatus according to 3 . The control valve ( 27 ) is connected to a control device (28), and the control device (28) supplies air to the pressure chamber (23) or from the pressure chamber (23) after a predetermined time interval. The apparatus according to claim 4 , wherein the evacuation is performed. The support plate (11) holds a yarn wetting device (12) for cutting and collecting the yarn of the yarn group (6), and the yarn wetting device (12) is made of the yarn guide strip ( 6. A device according to any one of claims 2 to 5 , which is preceded by 2). The yarn guide (3.1-3.4) is disposed on a sliding shoe (7), and the sliding shoe (7) is placed in the sliding guide portion (8) of the yarn guide strip (2). 7. A device according to any one of claims 1 to 6 , being guided.

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