JP6618993B2 - Device for drawing and drawing a plurality of yarns that have just been spun - Google Patents

Description

  The present invention relates to an apparatus for drawing and drawing a plurality of freshly spun yarns of the type described in the superordinate concept section of claim 1.

  During the production of synthetic yarns in the melt spinning process, the freshly spun yarns are guided in an array of godets with driven godet peripheral walls, preferably as a yarn group, for further processing after cooling, preferably as one yarn group. Is done. In this case, the godet peripheral wall of the godet may be configured to be heated or non-heated so that the yarn can be drawn out, drawn and stretched after spinning. Such a method and such a device are known, for example, from DE 10201311809 A1 (DE102013211809A1).

  In the known method and the known apparatus, a plurality of yarns are guided together as a single yarn group with a partial winding smaller than 360 ° on the peripheral surface of the driven godet peripheral wall. The godet peripheral wall is configured as a heating type, and is disposed inside the godet box. For this purpose, the yarn group is introduced into the godet box through the inlet opening and is again led out of the godet box through the outlet opening. The inlet opening and the outlet opening are formed such that the yarn groups can be guided side by side in parallel without contact. In this case, air exchange between the surroundings and the inner chamber of the godet box is inevitable. When the godet peripheral wall is heated, heat loss due to convection based on this air exchange occurs. In particular, during the manufacture of fully drawn yarn (FDY), the yarn needs to undergo intensive heat treatment on the surface of the godet peripheral wall. Despite the limited contact length between the yarn and the surface of the godet peripheral wall, in order to achieve sufficient heat treatment, there is a cooling step, especially in the yarn section that is freely guided inside the godet box. Should be avoided. Furthermore, stable yarn traveling and uniform yarn guidance on the peripheral surface of the godet peripheral wall are necessary for heat treatment. The inlet and outlet openings must be sized so that it is easy to supply the yarn group to the periphery of the godet peripheral wall and to another process unit, for example an oil supply device. . Generally, such oil supply devices or other process units are configured such that the yarn groups need to be guided outside the plane that the yarn groups occupy during operation for feeding into these units. Yes. Correspondingly, the required size of the inlet opening and / or the outlet opening is enlarged. Such an oil supply device may be arranged inside or outside the godet box.

  Accordingly, an object of the present invention is to improve a device for drawing and drawing a plurality of just-spun yarns of the type described at the beginning, so that uniform and stable heat treatment can be performed on the yarns inside the godet box. It is nevertheless intended that the yarn supply can be carried out as easily and without problems as possible.

  Another object of the present invention is to minimize heat loss during yarn processing and nevertheless allow trouble-free yarn feeding.

  This object is achieved according to the invention by an apparatus having the features of claim 1.

  Further advantageous embodiments of the invention are defined by the features and combinations of features of each dependent claim.

  In the present invention, a relatively high yarn speed of up to 5000 m / min is generated during the production of a fully drawn yarn (FDY), so that a group of yarns guided in a free section forms a relatively strong associated airflow. Is based on the knowledge. Therefore, two disadvantageous effects occur at the entrance opening of the godet box. That is, an external air flow is continuously supplied to the environment of the godet box through the yarn group. On the other hand, an air turbulence is formed by the accompanying airflow around the yarn group through the inlet opening, and this air turbulence has a significant influence on the yarn guide and thus on the godet surface. The invention here has the particular advantage that the size of the opening cross-section of the inlet opening and / or the outlet opening can be varied, so that the thread opening can be reduced by a correspondingly small opening cross-section. Such an inconvenient effect during the heat treatment is avoided. Therefore, the accompanying air flow generated by the yarn group is deflected from the freely guided yarn by the reduced opening cross-section when entering and / or exiting the godet box. It is done.

The device according to the invention therefore makes it possible to produce free opening cross sections with a very small area in the range of 10 mm ² per yarn to 20 mm ² per yarn at the inlet and / or outlet openings during operation. To do. A free open cross section is a section of a godet box in which yarn and air are introduced into and derived from the godet box. Such a free opening cross section whose size can be selected depending on the yarn fineness of the yarn results in significant restrictions on air exchange and air turbulence.

  In order to obtain a relatively large degree of freedom for non-contact guidance when feeding the yarn before the start of the process or after the interruption of the process, the device according to the invention has a free opening cross section at the inlet opening and / or at the outlet opening Provides the advantage of expanding. Therefore, there is a possibility of implementing the inlet opening in the godet box or the outlet opening in the godet box with a relatively large cross section. Depending on the respective operating conditions, the non-contact guide of the yarn group can be ensured by the adjustability of the opening cross section at the inlet opening and / or at the outlet opening. Only during operation when yarn tension is formed in the yarn group, the inlet or outlet opening is adjusted to the smallest dimension of the free opening cross section. A relatively large free open cross section can be used during the feeding process. Therefore, a problem-free supply of yarn is ensured even if an additional unit, for example an oil supply device, is arranged next to the inlet opening and / or the outlet opening.

  The device according to the invention in this case is provided with a correspondingly movable cover at the inlet opening and / or the outlet opening, the operating position where the cover forms a small opening cross section and the supply which forms a large opening cross section. It is advantageously used in an embodiment that is position adjustable back and forth between positions.

  Especially in the case of slit-shaped open cross sections, the cover preferably has a closed edge. This closing edge advantageously extends parallel to the slit-shaped inlet or outlet opening and is adapted to be laterally adjustable with respect to the slit.

  The cover is advantageously mechanically connected by itself to the door of the godet box or to the wall of the godet box. Thus, the desired opening cross section can be produced repeatedly and reliably and the cover can always be used.

  The mechanical connection between the cover and the door or wall of the godet box is preferably formed by a transmission. With this transmission, the adjustment between the supply position and the operating position can be controlled. For this purpose, for example, two pivotable guide arms may be provided, which are respectively held by the cover and the godet box via rotary joints.

  In a particularly advantageous manner, a force generator in the form of a spring is provided, which spring moves the cover to a supply position for enlarging the respective opening cross section by means of a spring force. In order to hold the cover in an operating position for minimizing the opening cross section, an additional counter force is created against the spring. This opposing force acts on the cover. This opposing force can be applied to the cover, for example manually by hand, magnetically or mechanically.

  In accordance with an advantageous aspect of the invention, so that the door mechanism can be used to generate an opposing force, the free end of the cover protrudes from the space of the godet box in the supply position. A cover is held in the godet box via a transmission. The cover penetrates the sealing plane between the door and the godet box, for example, so that when the cover is closed, an opposing force is formed on the cover by the door.

  Thus, the movement of the door advantageously controls the movement of the cover. The machine operator does not need to take care of adjusting the cover. For yarn supply, the operator opens the godet box door, in which case the cover moves to the supply position by the spring force of the spring. When the yarn supply is finished, the machine operator closes the door and the cover is automatically returned to the operating position against the spring.

  The mechanical device described above is only one possibility for adjusting the cover. In another advantageous embodiment, this adjustment is performed by an actuator connected to the cover. Furthermore, a limit switch is provided in the door or godet box, and this limit switch is operated when the door is closed. Since an electrical signal is sent to the actuator when the door is closed, the actuator moves the cover from the supply position to the operating position. On the contrary, the cover travels from the operating position to the supply position when the door is opened, which is likewise caused by the signal flow from the limit switch to the actuator.

  An apparatus according to the present invention will be described in detail below with reference to some embodiments with reference to the accompanying drawings.

1 is a schematic front view showing an embodiment of an apparatus according to the present invention. It is the schematic which looked at the embodiment shown in FIG. 1 from the bottom. It is the schematic which shows the detail of the cover containing the adjustment mechanism to which it belongs shown to FIG. 1 and FIG. It is the schematic which shows the detail of the cover shown to FIG. 1 and FIG. FIG. 6 is a schematic diagram illustrating details of an alternative embodiment of a cover including an associated adjustment mechanism.

  1 and 2 schematically show a plurality of viewpoints of an embodiment of the device according to the invention for drawing and drawing a plurality of freshly spun yarns. FIG. 1 shows this embodiment in a front view, and FIG. 2 shows this embodiment as seen from below. The following description applies to all drawings unless specifically associated with one of the drawings.

  The first embodiment has a total of four godets 1.1, 1.2, 1.3, and 1.4. These godets 1.1, 1.2, 1.3, and 1.4 are arranged side by side in the yarn traveling direction, and are held on the front side of the assembly wall 3. The godets 1.1 to 1.4 have godet peripheral walls 2.1 to 2.4 projecting from each other. These godet peripheral walls 2.1 to 2.4 are held so as to protrude on the front side 21 of the assembly wall 3, and each one godet drive device 11 disposed on the back side 22 of the assembly wall 3. .3 to 11.4. The drive units of godets 1.1 and 1.2 are not shown based on the viewpoint selected here. In the drawing of FIG. 2, the godet driving devices 11.3, 11.4 are godet peripheral walls 2.3-2 in which these godet driving devices 11.3, 11.4 are arranged on the front side 21 of the assembly wall 3. .4 shows how they are combined.

  As can be seen from the drawings of FIG. 1 and FIG. 2, the godet peripheral walls 2.1 to 2.4 held in a protruding manner are arranged inside the godet box 4. The godet box 4 is held on the front side 21 of the assembly wall 3. In this case, the godet box 4 covers the protruding godet peripheral walls 2.1 to 2.4, and in this case, a pivotable door 8 is formed on the front side. The door 8 is coupled to the godet box 4 on one side via a turning shaft 9 and has a hand grip 10 on the side opposite to the turning shaft 9.

  In FIG. 1, the godet box 4 is shown without a door in a front view. In the drawing of FIG. 2, the godet box 4 with a closed door 8 is shown in the operating state.

  As can be seen from the drawing of FIG. 1, the godet box 4 has an inlet opening 5 on the upper surface 13. Thereby, the yarn group 12 composed of a plurality of yarns guided side by side in parallel can be guided into the godet box 4 in a non-contact manner. The inlet opening 5 is formed as a slit 6 on the upper surface 13 of the godet box 4. The slit 6 opens toward the front side of the godet box 4 and is defined by the door 8. The free opening cross sections of the inlet opening 5 and the outlet opening 7 are preferably sized identically during operation.

  The outlet opening 7 is disposed on the lower surface 14 of the godet box 4. The outlet opening 7 is formed with a significantly larger opening cross section, in which case a movable cover 18 is provided. This cover 18 serves to change the area of the free opening cross section of the outlet opening 7. Since the cover 18 is shown here in the operating position, the smallest free opening cross section of the outlet opening 7 is produced. In this embodiment, the cover 18 is moved into the slit-shaped outlet opening 7 in parallel. In order to supply the yarn to the oil supply device 29, an opening cross section of the outlet opening 7 is required which is larger than necessary for the optimum operation described below of such a device. Therefore, for the yarn supply, the cover 18 is guided to a supply position (not shown), so that the yarn group 12 passes by the oil supply device 29 as shown here by a broken line. Can be guided as follows. That is, in the normal oil supply device 29, the yarn group is inserted into the oil supply device 29 from the right side as shown in FIG. In this embodiment, the cover 18 is formed to be movable, and may be connected to the door 8, for example.

FIG. 2 shows a viewpoint to the lower surface of the godet box 4 held on the assembly wall 3. An outlet opening 7 is arranged on the lower surface 14 of the godet box 4. In this embodiment, the outlet opening 7 is formed in a square shape. Since the outlet opening 7 is partially closed by the cover 18, the slit 6 remains as a free opening cross section. The slit 6 is defined by a slit length L and a slit height S. Slit height S, since the range of 2 mm to 5 mm, and the free opening cross section of the area in the range of 10 mm ² to 20 mm ² for each thread, in the case of six yarns, slit length L is 12 mm It may be in the range of ~ 60 mm. Thereby, especially when the yarn group advances from the godet box 4, the accompanying air is not largely led out from the godet box 4. Thus, the environment inside the godet box 4 remains substantially thermally isolated from the surroundings, which results in a particularly stable atmosphere inside the godet box 4.

  It should be emphasized here that the opening cross section of the inlet opening 5 on the upper surface 13 and the opening cross section of the outlet opening 7 on the lower surface 14 are exemplary. Depending on the yarn guide in the melt spinning process, the inlet opening 5 or the outlet opening 7 or both openings may be formed on the side of the godet box 4. Furthermore, the opening cross section of the inlet opening 5 may also be coupled to another cover that covers a portion of the inlet opening 5. The free opening cross section may not be formed in a slit shape with the same size as shown here. Different sizes or other shapes are also conceivable.

  Inside the godet box 4, the yarns of the yarn group 12 are laid on the godet peripheral wall 2.1 to 2.4 with partial wrapping smaller than 360 °, preferably with partial wrapping in the range of 180 ° to 270 °. Guided. The godet peripheral walls 2.1 to 2.4 are configured to be heatable. In this case, the surface temperature may be implemented differently depending on the requirements and the yarn treatment. Thus, the temperature can be adjusted in the range of 40 ° C to 250 ° C. The yarn drawing speed achieved in particular at the godet peripheral walls 2.3 and 2.4 is in the range from 3000 m / min up to 5000 m / min.

  The stability of the yarn guide is also influenced mainly by the air flow generated by the rotation of the godet peripheral wall 2.1 to 2.4 inside the godet box 4. In this case, heat loss does not occur, but the yarn guide is affected when it rides on the surface of the godet peripheral wall 2.1 to 2.4 and when it peels from the surface of the godet peripheral wall 2.1 to 2.4. Arise. The smallest possible inlet opening 5 and the smallest possible outlet opening 7 work so that as little air as possible can enter the godet box 4 from the outside. This has an advantageous effect on the strength of the turbulent flow that causes unstable yarn travel. An air guide metal sheet (not shown) may be provided in the godet box 4 to further improve and protect the yarn group against turbulence. Such an air guide sheet metal may be arranged in particular also at the inlet opening or the outlet opening. This is because additional air turbulence occurs at the inlet and outlet openings, and this air turbulence threatens the non-contact guide of the yarn group at the minimum inlet and outlet cross sections.

  FIGS. 3 and 4 show another embodiment of a cover 18 as can be used in the outlet opening 7 (shown) or the inlet opening 5 of the godet box 4 shown in FIG. Yes. FIG. 3 shows the cover 18 in a supply position with an enlarged opening cross section of the outlet opening 7, and FIG. 4 shows the cover 18 in an operating position with a reduced opening cross section of the outlet opening 7. Show. A viewpoint from the inside of the godet box 4 when the outlet opening 7 is viewed from above is shown. Similarly, the slit 6 having the slit length L to which it belongs and the yarn group 12 running in the slit 6 are the components of FIGS. 3 and 4. The same reference numerals are used for both drawings.

  The cover 18, the transmission 26 and the godet box 4 are shown. The cover 18 is pivotally coupled to the lower wall 30 of the stationary godet box 4 by means of the transmission 26. For this purpose, the transmission 26 has two guide arms 31.1, 31.2 which are pivotable. The guide arms 31.1 and 31.2 are coupled to the cover 18 and the wall 30 via a plurality of rotary joints 32. The cover 18 is formed in a plate shape, and has an abutting end 33.1 located on the inner side and an abutting end 33.2 located on the outer side. A lateral closing edge 19 extends between these abutting ends 33.1, 33.2. This closing edge 19 extends substantially parallel to the slit edge 24 of the outlet opening 7 in the operating position of the cover 18 and forms the slit 6.

  A spring 27 formed here as a torsion spring is arranged correspondingly to the abutting end 33.1 located inside. This spring is supported at the projection of the godet box 4 by the first spring leg 34.1 and at the abutting end 33.1 of the cover 18 by the second spring leg 34.2. Therefore, the cover 18 is held at the supply position shown in FIG. 3 based on the spring force of the spring 27. The door 8 of the godet box 4 is open in this case, and the abutting end 33.2 located outside the cover 18 penetrates the sealing plane 28 formed by the door 8 and the godet box 4. Yes. The contact end 33.2 located outside the cover 18 projects from the inside of the godet box 4 at the supply position.

  In FIG. 4, the cover 18 is shown in the operating position. The free opening cross section of the outlet opening 7 is formed as a slit 6 having a slit length L and a slit height S. The slit 6 is defined by the godet box 4 and the closing edge 19 of the cover 18. The thread group 12 runs out of the godet box 4 through the slit 6. The door 8 is closed flush with the godet box 4. In this case, by closing the door 8, an opposing force against the spring 27 is generated at the abutting end portion 33.2 of the cover 18 located outside, so that the cover 18 returns from the supply position to the operating position. Moved to. In this state, the cover 18 is completely located in the inner chamber of the godet box 4, and no longer penetrates the sealing plane 28 between the godet box 4 and the door 8. During the closing of the door 8, the cover 18 is pivoted from the supply position to the operating position. The opposing force generated by the door 8 at the abutting end 33.2 of the cover 18 facing the door 8 must be large enough to compress the spring 27. The door 8 is provided with corresponding means which can be maintained during operation by applying this force.

  FIG. 5 shows another embodiment of the cover 18 together with the adjustment mechanism, such as can be used, for example, at the outlet opening 7 or the inlet opening 5 of the godet box 4 according to the embodiment shown in FIGS. It is shown. FIG. 5 shows the outer lower surface 14 of the godet box 4 with the outlet opening 7. A movable cover 18 is held on the lower surface 14. The cover 18 can be moved by an actuator 20. The cover 18 has a closing edge 19. This closing edge 19 extends parallel to the slit edge 24 of the outlet opening 7. FIG. 5 illustrates an operating situation in which the yarn group is drawn, drawn and relaxed in the melt spinning process. In this situation, the opening cross section of the outlet opening 7 has been reduced to the smallest dimension so that the cover 18 is in the operating position. The outlet opening 7 is therefore substantially covered by a cover 18 and only a narrow slit 6 is open for the thread group to run out. For the supply of the yarn group 12, the cover 18 can be moved to the supply position towards the right by the actuator 20, so that the complete opening cross section of the outlet opening 7 is opened. The thread group 12 can be guided with greater flexibility in the relatively large opening cross section of the outlet opening 7, so that in particular the supply process to subsequent units, for example the oil supply device 29, is carried out without significant frictional contact. can do. After the yarn group 12 has been supplied to the subsequent process unit, the cover 18 can be guided to reduce the opening cross section of the outlet opening 7 to the operating position illustrated in FIG. This movement process of the cover 18 is caused by the limit switch 25. When the door 8 is open, the limit switch 25 protrudes from the godet box 4 as indicated by a broken line in FIG. When the door 8 is closed, the limit switch 25 is operated by this door 8. A control device not shown here transmits a corresponding electrical signal to the actuator 20. This electric signal causes the cover 18 to travel from the supply position toward the left side to the operation position. When the door 8 is opened, the limit switch 25 is operated again, but this time in a different manner. The signal transmitted to the actuator 20 by the control device in this case causes the movement of the cover 18 towards the right side from the operating position to the supply position by the actuator 20.

  The illustrated shape and size of the cover 18 is exemplary. Other shapes are also conceivable, for example a cover 18 with a profilert closing edge 19. In extreme cases, this forming part may be configured in such a way that a separate, e.g. circular, open cross-section occurs for each yarn of the yarn group 12 in the operating position. The present invention is further not limited to a single movable cover 18. Thus, two or more covers 18 may be provided that serve to change the size of the free opening cross section of the inlet opening 5 and / or the outlet opening 7. The connection of the cover 18 to the godet box 4 is likewise exemplary. According to the present invention, the cover 18 may be attached to the door 8 as well. Furthermore, other transmission modes than those shown are also conceivable.

1.1, 1.2, 1.3, 1.4 Godet 2.1, 2.2, 2.3, 2.4 Godet peripheral wall 3 Assembly wall 4 Godet box 5 Inlet opening 6 Slit 7 Outlet opening 8 Door 9 Rotating shaft 10 Hand grip 11.3, 11.4 Godet drive device 12 Thread group 13 Upper surface 14 Lower surface 18 Cover 19 Closing edge 20 Actuator 21 Front side 22 Back side 24 Slit edge 25 Limit switch 26 Transmission device 27 Spring 28 Seal plane 29 Oil Supply Device 30 Wall 31.1, 31.2 Guide Arm 32 Rotating Joint 33.1, 33.2 Abutting End 34.1, 34.2 Spring Leg L Slit Length S Slit Height

Claims (6)

A device for drawing and drawing a plurality of yarns that have just been spun, comprising a plurality of godets (1.1-1.4), and a godet peripheral wall ( 2.1-2.4) is arranged inside the godet box (4), which has at least one inlet opening (5) and at least one outlet opening (7). In a device having
The opening cross section of the inlet opening (5) and / or the size of the opening cross section of the outlet opening (7) is formed to be adjustable ,
At least one movable cover (18) is arranged corresponding to the inlet opening (5) and / or the outlet opening (7), the cover (18) being in an operating position forming a small opening cross section. Position adjustable between supply positions forming a large open cross section,
The cover (18) protrudes from the space defined by the outer contour of the godet box (4) in the supply position;
Just-spun, characterized in that the position adjustment of the cover (18) between the operating position and the supply position is initiated by the movement of the door (8) of the godet box (4) A device that draws and stretches multiple yarns. The cover (18) has a closing edge (19) which extends parallel to the slit edge (24) of the outlet opening (7) in the operating position. 2. The device according to claim 1 , wherein the device is configured to be positionally adjustable relative to the slit edge (24). The device according to claim 1 or 2 , wherein the cover (18) is mechanically coupled to a wall (30) of the godet box (4) or a door (8) of the godet box (4). . A transmission device (26) is provided, by which the cover (18) is connected to the wall (30) of the godet box (4) or the door of the godet box (4). 4. The device of claim 3 coupled to (8) and adjustable in position. The cover (18) cooperates with a force generator (27), the force generator (27) being able to perform an automatic position adjustment of the cover (18) from the operating position. Item 5. The apparatus according to any one of Items 1 to 4 . The cover (18) is connected to an actuator (20), the actuator (20) is connected to a limit switch (25), and the limit switch (25) is connected to the godet box (4). 3. A device according to claim 1 or 2 , attached to the door (8).

Images