JP2007284861A - Spindle shaped element for air jet spinning device having injection pathway - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the production of a spindle shaped element for an air jet spinning device. <P>SOLUTION: The spindle shaped element for an air jet device comprises a base body and an attachment tip. The spindle shaped element includes a thread drawing pathway extending through the base body and the tip and the first part of the tread drawing pathway is an inlet opening of the tip. The spindle shaped element includes an injecting pathway joined with a tread drawing pathway and the injecting pathway is directed in the direction of the inlet opening of the tread drawing pathway. The injection pathway is formed of a surface zone of the base body and the surface zone of the tip. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spindle-shaped element for an air jet spinning apparatus, which includes a base body and an attached tip, and further includes a yarn withdrawal passage extending through the base body and the tip, the yarn withdrawal passage being disposed within the tip. And the spindle-shaped element includes at least one injection passage leading to the yarn withdrawal passage, which is directed in the direction of the inlet opening of the yarn withdrawal passage.

  The invention further relates to a tip and base body for a spindle-shaped element of this type.

  A spindle-shaped element of this type is prior art in German published patent application DE 10 2004 044 345 A1. During the spinning process, fiber strands of staple fibers are fed into an air jet spinning device where spinning twist is then applied. In this process, the fiber strand is first fed into the vortex chamber through the fiber feed passage of the air jet spinning assembly. The vortex chamber is assigned a fluid device for generating a vortex around the inlet opening of the yarn drawing passage. The front end of the fiber held in the fiber strand is thereby fed into the yarn withdrawal passage, while the rear free fiber end is widened and caught by the vortex and is already located in the inlet opening of the yarn withdrawal passage Part, i.e. an already twisted end, is entangled around, thereby producing a yarn with a true twist to a large extent.

  If for some reason the yarn strand or spun yarn that is still very weak and untwisted is broken, a splicing process must be carried out, where the end of the already spun yarn is the air jet spinning device Is reversed. For this process, an injection passage is arranged in the spindle-shaped element, which is connected to the yarn withdrawal passage and is directed to the inlet opening of the yarn withdrawal passage. This injection passage is exposed to pressurized air in the yarn splicing step, and therefore an air flow is generated in the air jet spinning device that flows in the opposite direction to the spinning direction. Due to the injection effect, the already spun yarn can be sucked into the yarn drawing passage and transported in the opposite direction to the normal spinning direction through the air jet spinning device. The yarn end guided through the air jet spinning device is then deflected in a known manner and can thus be prepared so that it can be joined to the newly supplied fiber strand. After the fiber strand is spliced to this yarn end, the spinning process is restored.

  The known spindle-shaped elements have the disadvantage that, as a result, the injection passage leading to the yarn withdrawal passage is formed by very narrow perforations. The perforation for the injection passage is arranged in the tip attached to the base body of the spindle-shaped element. The injection passage perforations are perforated at an acute angle with respect to the thread withdrawal passage and usually have a diameter of a few tenths of a millimeter. The manufacture of the injection passage is very complicated since the tip of the spindle-shaped element is often made from a hard and wear-resistant material.

  Various types of spindle-shaped elements for an air jet spinning device are known from German published patent application DE 10349651 A1, where an injection passage extending in various ways is provided. The injection passage is connected to the yarn withdrawal passage at a right angle and is therefore not directed towards the inlet opening of the yarn withdrawal passage. This installation of the injection passage has the disadvantage that the injection action of the pressurized air flow into the yarn withdrawal passage is not so effective, so that the yarn end necessary for the splicing process is always reliable and spun. It is sucked into the yarn withdrawal passage in the opposite direction to the direction and cannot be transported through the air jet spinning device. Since the injection passage is connected to the yarn withdrawal passage at a right angle, the incoming pressurized air can also flow in the spinning direction through the yarn withdrawal passage, and thus continues in the air jet spinning device in the direction opposite to the spinning direction. Prevent airflow from occurring.

  The object of the present invention is to simplify the manufacture of spindle-shaped elements of the type described above.

  This object is achieved in that at least one injection passage is formed by the surface area of the base body and the surface area of the tip.

  In this embodiment, the injection passage, when viewed in cross-section, is not surrounded by only one of the elements of the base body or the tip, but at the same time by both. A part of the peripheral wall of the injection passage is formed by the base body, and another part of the peripheral wall of the injection passage is formed by the tip. This has the advantage that the injection passage is not entirely present either in the base body or in the tip. The injection passage is formed when the tip and base body are joined together during assembly of the spindle-shaped element. The base body and the surface area of the tip that form the injection passage when assembled later can thus be manufactured and machined separately. Thus, manufacturing is simplified since very fine perforations are no longer necessary.

  It is advantageous when the injection passage is formed by a conical surface area of the base body and / or a conical surface area of the tip. The conical surface area directs the injection passage leading to the yarn withdrawal passage in the direction of the inlet opening of the yarn withdrawal passage, and also the spinning of the air jet spinning device required for the yarn splicing process, in particular the yarn withdrawal passage. It can be ensured particularly well that an air flow directed in the opposite direction to the direction is reliably generated when the injection passage is exposed to pressurized air. Due to the base body or the conical surface area at the tip, the injection passage extends at an acute angle with respect to the yarn withdrawal passage, at least in the region immediately upstream where the injection passage leads to the yarn withdrawal passage.

  The injection passage in the finished spindle-shaped element can be defined to be formed by a conical surface region at the tip, which is at a defined distance relative to the conical surface region of the base body. In one embodiment of the invention, it can be provided that the grooved surface area of either the tip or base body is located in the conical surface area of either the tip or base body.

BRIEF DESCRIPTION OF THE DRAWINGS These and further objects, features and advantages of the present invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
FIG. 1 shows the axial section of the spindle-shaped element and the respective air jet spinning device in operation with greatly enlarged dimensions, and FIG. 2 shows a view similar to FIG. 1 of another embodiment of the spindle-shaped element.

  The air jet spinning device shown in FIG. 1 serves to produce a spun yarn 2 from staple fiber strands 3. The draft device 4 is arranged upstream of the air jet spinning device 1, and the draft device 4 generates thin fiber strands 3 from the staple fiber strands 5 and supplies them to the air jet spinning device 1.

  The staple fiber strand 5 is supplied to the draft device 4 in the draft direction A, and is drafted to a desired fineness by a known method. The drafting device 4 shown only partly is preferably a four cylinder drafting device and thus comprises four roller pairs, each of which comprises a lower driving roller and an upper roller designed as a pressure roller. Only the delivery roller pair 6, 7 is shown, which bounds the draft device 4. There is a thin fiber strand 3 immediately downstream of the draft device 4, which is drafted but not yet twisted.

  The fiber strand 3 is supplied to the air jet spinning device 1 through the fiber supply passage 8. There is a so-called vortex chamber 9 downstream thereof, in which the fiber strand 3 is subjected to its spinning twist, so that a spun yarn 2 is formed, which is drawn out in the drawing direction B through the yarn drawing-out passage 10 and is wound up (not shown). ).

  The thread withdrawal passage 10 is arranged in a spindle-shaped element 11 which is stationary in operation, said element 11 comprising a base body 12 and a tip 13. The yarn withdrawal passage 10 includes an inlet opening 14 for forming the yarn 2, which opening 14 is arranged at the tip 13.

  The fluid device generates a vortex flow by blowing compressed air through a compressed air nozzle 15 tangentially connected to the vortex chamber 9 during the spinning process in the vortex chamber 9. Compressed air exiting the compressed air nozzle 15 is exhausted through a discharge passage 16 where the passage 16 has a ring-shaped cross section around the spindle-shaped element 11 that includes the yarn withdrawal passage 10. The air discharge passage 16 is connected to a reduced pressure source (not shown).

  The edge of the fiber guide surface 17 acting as a twist stop is arranged in the region of the vortex chamber 9, which is arranged slightly eccentric with respect to the yarn withdrawal passage 10 in the region of the inlet opening 14. .

  In the air jet spinning device 1, the fibers to be spun are held together on the one hand in the fiber strands 3 and are therefore fed from the fiber feed passage 8 into the yarn withdrawal passage 10 essentially without spinning and twisting. The fibers in the region between the fiber supply passage 8 and the yarn withdrawal passage 10 are exposed to the vortex. The vortex drives the fibers, or at least their end regions, radially away from the inlet opening 14 of the yarn withdrawal passage 10. The yarn 2 made by the air jet spinning device 1 described above has a core containing fibers or fiber regions extending essentially in the machine direction of the yarn without any significant twist, and the fibers or fiber regions wound around the core. And having an external area. This type of air jet spinning device 1 allows very high spinning speeds, which are in the range of 300-600 m / min.

  The compressed air exiting from the compressed air nozzle 15 to the vortex chamber 9 is supplied to the air jet spinning device 1 through the compressed air passage 18 and the ring passage 19 surrounding the vortex chamber 9 during operation. If the fiber strand 3 or the yarn 2 is broken for some reason, the compressed air supplied to the compressed air nozzle 15 is cut off. At the same time, the drive of the draft device 4 and the yarn drawing roller and winding device (not shown) can also be interrupted.

  It may be advantageous to move the spindle-shaped element 11 away from the fiber feed channel 8 for a short time for cleaning purposes before the necessary splicing step is performed. During operation, there is a very small distance between the inlet opening 14 of the yarn draw-out passage 10 and the fiber guide surface 17, which can be, for example, 0.5 mm. The spindle-shaped element 11 can include a piston-like element 20, so that the moving away of the spindle-shaped element 11 can be carried out using very simple means. A ring passage 21 is arranged around the spindle-shaped element 11 and this ring passage 21 can be exposed to compressed air. The compressed air in the ring passage 21 presses the piston-shaped element 20 fixedly attached to the base body 12 of the spindle-shaped element 11 upward against the force of the spring 22 as shown in FIG. The tip 13 of the spindle-shaped element 11 with the inlet opening 14 of the yarn withdrawal passage 10 is moved aside by the fiber supply passage 8 and the fiber guide surface 17, so that a larger space exists in the vortex chamber 9. Accordingly, any fiber waste present in the vortex chamber 9 can be discharged through the air discharge passage 16. After the compressed air is cut off in the ring passage 21, the spring 22 pushes the spindle-shaped element 11 back to its operating position.

  In order to restart the spinning process, a splicing process is now necessary, in which one end of the already spun yarn 2 is returned through the yarn withdrawal passage 10 in the opposite direction to the withdrawal direction B and then the entire air jet It is returned to the draft device 4 through the spinning device 1 in the direction opposite to the spinning direction. The yarn end that has been reversed through the air jet spinning device 1 can be combined with the fiber strand 3 in the drafting device 4 and the spinning process can be restarted. In the yarn splicing step, an injection passage 23 is provided in the spindle-shaped element 11 for the purpose of returning the yarn 2 back, and the injection passage 23 is connected to the yarn withdrawal passage 10 and directed to the inlet opening 14. The injection passage 23 is exposed to compressed air during the yarn splicing process and generates an air flow in the yarn drawing passage 10 and the fiber supply passage 8, which flows to the draft device 4 in the direction opposite to the spinning direction. Here, before the injection passage 23 is connected to the yarn withdrawal passage, the yarn introduction effect in the yarn withdrawal passage 10 is sufficient to ensure that the rear supply end of the yarn 2 is reliably sucked in. It is important to extend at an acute angle with respect to the drawer passage 10. In order to facilitate the cleaning of the vortex chamber 9, it may be advantageous to expose the injection passage 23 to compressed air already during the cleaning process described above.

  According to the invention, it is now specified that the injection passage 23 is formed by the surface region 24 of the base body 12 and the surface region 25 of the tip 13. The spindle-shaped element 11 includes an element base body 12 and a tip 13. This is advantageous because the tip 13, in particular the tip 13 in the region of the inlet opening 14 of the thread withdrawal passage 10, is subject to a high degree of wear and is therefore made of a wear-resistant material. An essentially cylindrical take-up part 26 is provided, through which the tip 13 is connected to the base body 12. The tip 13 can be fixed here by, for example, a press fit or by a thread on the pick-up part 26. In order to provide a seal between the base body 12 and the tip 13, a seal ring 27 can be provided, for example made from copper.

  The embodiment of the injection passage 23 according to the invention is a particularly simple production of the spindle-shaped element 11 since the surface area 24 is machined when the base body 12 is made, while the surface area 25 is machined when the tip 13 is made. It becomes the source of sex. The surface areas 24 and 25 of the injection passage 23 are machined separately from each other before the spindle-shaped element 11 is assembled, and the injection passage 23 only occurs when the tip 13 and the base body 12 are joined together. The injection passage 23 with a small cross section is not manufactured as a whole, but rather is formed only when the surface regions 24 and 25 are arranged with each other when the spindle-shaped element 11 is assembled. When the cross section of the injection passage 23 is observed, it can be seen that a part of the peripheral wall is formed by the surface region 24 of the base body 12 and the other part of the peripheral wall is formed by the surface region 25 of the tip 13.

  The surface region 24 of the base body 12 has a conical shape so that the injection passage 23 extends at an acute angle with respect to the yarn withdrawal passage 10 and faces the inlet opening 14. The surface region 25 can be designed as a groove in the tip 13. The groove-shaped surface region 25 is arranged with respect to the conical-shaped surface region 24, through which the injection passage 23 is formed. Alternatively, the surface region 25 also has a conical shape and then surrounds the conical surface region 24 at a short distance. This is indicated by the dashed line with reference number 25 '. This will result in a ring shaped injection passage 23 extending around the thread withdrawal passage 10 instead of a single injection passage 23.

  In order to supply compressed air to the injection passage 23, a groove 28 is provided in the region of the take-up 26, which extends parallel to the thread withdrawal passage 10, said groove 28 being connected to a ring passage 29 and an intermediate passage 30. Yes. The intermediate passage 30 is also connected with a ring passage 31 surrounding the base body 12 of the spindle-shaped element 11, which can be supplied with the necessary compressed air via a conduit 32. In the case of the groove-shaped surface region 25 of the tip 13, a plurality of groove-shaped surface regions 25 and naturally corresponding grooves 28 are arranged around the yarn drawing passage 10. For example, the four groove-shaped surface areas 25 can be arranged uniformly around the yarn withdrawal passage 10.

  The groove-shaped surface area 25 of the tip 13 as well as the groove 28 can be particularly advantageously made in the tip 13 without machining. This is possible, for example, by a stamping process or by direct manufacture of the tip 13 with a forming tool. The manufacture of the tip 13 is thereby achieved very easily compared to the prior art described above.

  FIG. 2 shows further shapes of the spindle-shaped element 11 and the injection passage 23. The same parts have the same reference numbers as in FIG. Reference should be made to the description accompanying FIG. 1 to avoid repetition.

  In the embodiment shown in FIG. 2, a groove 33 in the base body 12 in the region of the take-up 26 is provided for supplying compressed air from the ring passage 29 to the injection passage 23. The injection passage 23 is formed by the conical surface area 35 of the tip 13 and by the groove-shaped surface area 34 of the base body 12. The provision of the groove 33 and the groove-shaped surface region 34 of the base body 12 can advantageously be advantageous when the tip 13 is made of a material that is difficult to form, such as ceramic. The groove-shaped surface region 34 is disposed in the conical-shaped surface region 35 so that the injection passage 23 is formed when the tip 13 is assembled on the base body 12.

  Alternatively, in the embodiment of FIG. 2, it can be provided that the surface region 34 of the base body 12 also has a conical shape and is arranged at a short distance in the conical surface region 35. This also results in a ring-shaped injection passage 23 indicated by a broken line with the reference number 34 '. The groove 33 or the groove-shaped surface area 34 of the base body 12 can advantageously be formed by milling. As described in FIG. 1, a number of grooves 33 and groove-shaped surface areas 34 can of course also be arranged around the thread withdrawal passage 10.

Fig. 2 shows the axial section of the spindle-shaped element and the respective air jet spinning device in operation with greatly enlarged dimensions. FIG. 2 shows a view similar to FIG. 1 of another embodiment of a spindle-shaped element.

Claims (7)

  A spindle-shaped element (11) for an air jet spinning device (1) comprising a base body (12) and an attached tip (13), further through the base body (12) and the tip (13) A thread withdrawal passage (10) extending, the thread withdrawal passage (10) including an inlet opening (14) disposed in the tip (13), and a spindle-shaped element (11) in the thread withdrawal passage (10). It comprises at least one injection passage (23) that is connected, said injection passage (23) being directed in the direction of the inlet opening (14) of the yarn withdrawal passage (10), wherein at least one injection passage (23) is provided. Spindle-shaped element formed by the surface area (24; 34) of the base body (12) and by the surface area (25; 35) of the tip (13).   2. Spindle-shaped element according to claim 1, characterized in that the injection passage (23) is formed by a conical surface area (24; 34 ') of the base body (12).   3. Spindle-shaped element according to claim 1 or 2, characterized in that the injection channel (23) is formed by a conical surface area (25 ', 35) of the tip (13).   4. A spindle-shaped element according to claim 1, wherein the injection channel is formed by a groove-shaped surface region of the tip.   5. The spindle-shaped element according to claim 1, wherein the injection passage is formed by a groove-shaped surface region of the base body. 12.   In the tip (13) for the spindle-shaped element (11) of the air jet spinning device (1) comprising a yarn withdrawal passage (10) with an inlet opening (14), the surface region (25; 35) is the tip (13). At least one injection directed towards the inlet opening (14) when it is coupled together with the surface area (24; 34) of the base body (12) for the spindle-shaped element (11) A tip characterized by forming a passage (23).   3. A base body (12) for a spindle-shaped element (11) according to claim 1 or 2, wherein the surface area (24; 34) present in the base body (12) is the surface area (24; 34). Base body characterized in that it forms at least one injection passage (23) when coupled together with the surface area (25; 35) of the tip (13) for the spindle-shaped element (11).

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