JP2008512576A - Air jet spinning equipment - Google Patents

Abstract

The present invention relates to an air jet spinning device, which comprises a fiber introduction passage (8) opening into the vortex chamber (9) and a fiber drawing passage (10) exiting from the vortex chamber (9). Said withdrawal passage is arranged in a spindle-shaped element (13), which can be moved away from the fiber introduction passage (8) by means of an adjusting device. A cleaning passage (23), which can be connected to a compressed air source (E) and directed to the spindle-shaped element (13), is provided for cleaning the area of the inlet opening of the fiber drawing passage (10). . The cleaning passage (23) opens into an annular passage (24) surrounding the spindle-shaped element. The first outlet opening (25) from the annular passage is embodied to form an annular opening surrounding the spindle-shaped element (13) when moved away from the fiber introduction passage (8), and the fiber introduction passage ( Directed against 8). The second outlet opening from the annular passage opens into the yarn withdrawal passage (10) via the intermediate passage (27) and is directed to its inlet opening (15). For maintenance, the area of the inlet opening (15) can thus be cleaned from the inside and the outside.
[Selection] Figure 2

Description

  The present invention relates to an air jet spinning device, which comprises a fiber feed passage leading to a vortex chamber, further comprising a fiber draw passage arranged in a spindle-shaped element exiting the vortex chamber and having an inlet opening, and further comprising a spindle It includes a movable device for moving the shape element away from the fiber supply passage, and further includes a cleaning passage having an outlet opening directed against the spindle shape element and connectable to a source of pressurized air.

  An air jet spinning device of this type is prior art in German published patent DE 19501545 C2. During the spinning process, staple fiber bundles are drafted into fiber strands in a draft device arranged upstream, and then the fiber strands are subjected to spinning twist in an air jet spinning device. In this process, fiber strands are first fed into the vortex chamber through the fiber jet passage of the air jet spinning assembly, and this vortex chamber is assigned a fluid device for generating a vortex around the inlet opening of the yarn withdrawal passage. . The front end of the fiber held in this fiber strand is thereby fed into the yarn withdrawal passage, while the widened rear free fiber end is captured by the vortex and is already located in the inlet opening of the yarn withdrawal passage. (Ie, the already tangled end) is tangled around, thereby generating a yarn with a true twist in a large area.

  If for some reason the fiber strands or spun yarns that are still very weak are broken, the splicing process must take place, where the ends of the already spun yarns are sent back to the drafting device. It is. In the known air jet spinning apparatus, after the spinning process is interrupted, the pressurized air exiting from the pressurized air nozzle is further cut off and the elements including the yarn withdrawal passage are moved away from the fiber feed passage. Here, it is necessary to clean the area between the fiber supply passage and the yarn withdrawal passage. This is because, in the case of an end break, the fiber or yarn tuft can be stacked in a relatively narrow gap existing between the fiber supply passage and the yarn withdrawal passage during operation.

  For the purpose of cleaning this critical area, certain changes in the above-mentioned prior art are disclosed, according to which a cleaning passage is provided, which is moved when the spindle-like element is moved away from the fiber feed passage. A stream of pressurized air is blown against the spindle-shaped element. However, as is apparent from the example embodiments, complete cleaning of the critical areas is not possible due to the fact that the inlet opening of the thread withdrawal passage is very far from the outlet opening of the cleaning passage. This is especially true when the yarn withdrawal passage is blocked in the region of its inlet opening.

  The object of the present invention is to avoid this drawback and provide an effective cleaning method for a particularly important area between the fiber feed passage and the inlet opening of the yarn withdrawal passage in the event of interruption of the spinning process, Is to create a solution for air jet spinning equipment of the type.

  This object is achieved according to the invention when the cleaning passage leads to a ring passage surrounding the spindle-shaped element and the first outlet opening of this ring passage is moved so that the spindle-shaped element moves away from the fiber feed passage. Designed as a ring opening surrounding the shape element and directed to the fiber feed passage, and the second outlet opening of this ring passage leads to the thread withdrawal passage through an intermediate passage and is relative to the inlet opening Achieved by being directed.

  Due to this feature of the present invention, complete cleaning from the outside and inside of the area of the inlet opening of the yarn withdrawal passage is possible. On the one hand, the air stream coming from the ring opening blows on the outer contour of the spindle-shaped element and on the fiber feed passage, cleaning this area from the outside. On the other hand, a further flow of pressurized air is blown against the fiber supply passage from the inside through the second outlet opening of the cleaning passage, ie through the inlet opening of the yarn withdrawal passage.

  The spindle-shaped element of an air jet spinning device is usually surrounded by an air discharge passage, where a lower pressure works well during the maintenance process, and the fiber pieces blown off by the flowing air stream are immediately discharged.

  In one embodiment of the invention, it is defined that the first outlet opening is closed when the spindle-shaped element is not moved away from the fiber feed passage. Thus, when the spindle-shaped element is in its operating position, no air flow can flow over its external contour, even when pressurized air is still active. However, in this state, the pressurized air supplied through the cleaning passage can be supplied into the fiber drawing passage through the intermediate passage, so that this pressurized air can be further added to the initial cleaning function. The function of sucking the yarn end being transported back to the drafting device by injection and supplying it to the fiber supply passage can be provided. The connection to the pressurized air source is therefore disconnected from the cleaning passage not only when the cleaning process is first completed but also when the yarn end is fed back to the drafting device for the splicing process.

  The first outlet opening designed as a ring opening in the cleaning passage can be closed in a very simple way when the spindle-shaped element is in the operating position. The spindle-shaped element is advantageously not moved away from the fiber supply passage, and the region of the smaller outer diameter that opens the ring opening when the spindle-shaped element is moved away from the fiber supply passage It includes a region with a larger outer diameter that sometimes closes the cleaning opening by a sealing gap. This method eliminates the need for a pressurizing valve, which provides cost savings.

BRIEF DESCRIPTION OF THE DRAWINGS These and further objects, features and advantages of the present invention will become more readily apparent from their following detailed description when taken in conjunction with the accompanying drawings.
FIG. 1 shows a greatly enlarged view in axial section of an air jet spinning device according to the invention during operation,
FIG. 2 shows a diagram of the same air jet spinning apparatus in a non-operating state.

  The air jet spinning device 1 shown in FIG. 1 serves to produce a spun yarn 2 from staple fiber strands 3. A draft device 4 is arranged upstream of the air jet spinning device 1.

  The staple fiber strand 3 is supplied to the draft device 4 in the draft direction A, drawn as the spun yarn 2 in the draw direction B, and guided to a winding device (not shown). The drafting device 4 shown only partly is preferably a three-cylinder drafting device and thus comprises three roller pairs, each of which comprises an upper roller designed as a driving lower roller and a pressure roller. Only the delivery roller pair 5, 6 is shown, which ends the draft zone of the draft device 4. In this type of drafting apparatus, the staple fiber strand 3 is drafted to a desired fineness by a known method. Just downstream of the drafting device 4 is a thin fiber strand 7, which has been drafted but not yet twisted.

  The fiber strand 7 is supplied to the air jet spinning device 1 through the fiber supply passage 8. Downstream of that there is a so-called vortex chamber 9 in which the fiber strand 7 undergoes its spinning twist, so that a spun yarn 2 is formed, which is drawn out through a yarn pull-out passage 10.

  The fluid device generates a vortex flow by blowing compressed air through a compressed air nozzle 11 connected in a tangential direction to the vortex chamber 9 during the spinning process in the vortex chamber 9. Compressed air exiting the nozzle opening is exhausted through an exhaust passage 12 where the passage 12 has a ring-shaped cross section around the spindle-shaped element 13. The spindle-shaped element 13 is stationary during operation and includes a thread withdrawal passage 10.

  The edge of the fiber guide surface 14 acting as a twist stop is arranged in the region of the vortex chamber 9, said fiber guide surface 14 being arranged slightly eccentric with respect to the yarn withdrawal passage 10 and in the region of its inlet opening 15. Yes.

  In the air jet spinning device 1, the fibers to be spun are held together on the one hand in the fiber strands 7 and are thus 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 15 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 11 to the vortex chamber 9 is supplied to the air jet spinning device 1 in the supply direction C through the compressed air passage 16 during operation. From the compressed air passage 16, the compressed air first reaches a ring passage 17 surrounding the vortex chamber 9, and the above-described compressed air nozzle 11 is directly connected to the vortex chamber 9.

During the operational spinning process, there is a very small distance between the inlet opening 15 of the yarn draw-out passage 10 and the fiber guide surface 14, which can be, for example, 0.5 mm. This small distance X ₁ is adjusted by a spindle-shaped element 13 containing the thread drawer passage 10 is arranged in such a way to be movable in the axial direction. The distance X ₁ can be in the operating state is fixed by the spring. As can be seen in Figure 2 to take a greater distance X _2, in order to increase the distance X _1, spindle-shaped element 13 comprises a piston-like element 19. Its functions are described below.

  When the fiber strand 7 or the yarn 2 is broken for some reason, the compressed air supplied to the vortex chamber 9 is first cut off. See arrow with cross in FIG. At the same time, all driving of the draft device 4 and the yarn drawing roller (not shown) and the winding device (not shown) are switched off. The upper roller 6 of the delivery roller pair 5, 6 is raised from the lower roller 5.

  Since the spindle-shaped element 13 includes a piston-shaped element 19, the movement of the spindle-shaped element 13 away from the fiber supply passage 8 can be carried out using very simple means. Accordingly, a ring passage 20 surrounding the spindle-shaped element 13 is provided, which is connected to a conduit 21 for compressed air. This compressed air is supplied only when the spinning process is interrupted. See arrow D in FIG. 2 and arrow with cross in FIG. The compressed air entering the ring passage 20 moves the piston-like element 19 upward as shown in the view of FIG. 2, so that the ring passage 20 increases to an enlarged ring chamber 22 due to the stroke of the piston. The piston-like element 19 borders the ring passage 20 during operation and borders the enlarged ring chamber 22 when the spinning process is interrupted. The compressed air of the mobile device so designed acts on the spring 18 as a result, which pushes the piston-like element 19 into its safe operating position when the compressed air is cut, i.e. during the spinning process. . The movement of the spindle-shaped element 13 away from the fiber supply passage 8 is effected by the compressed air supplied via the conduit 21, while the spring 18 performs a return movement.

A very small distance X ₁ is increased to a distance X ₂ by moving the spindle-shaped element 13 away, which is between the fiber guide surface 14 and the inlet opening 15 of the yarn withdrawal passage 10 in the manner described below. Enables space cleaning.

  The yarn end for piecing can then be returned towards the drafting device 4 in a direction not shown in the drawing, in the direction opposite to the operation drawing direction B of the yarn 2.

  In order to clean an important area between the fiber supply passage 8 and the inlet opening 15 of the yarn withdrawal passage 10, a cleaning passage 23 is provided, to which compressed air can be supplied in the supply direction E when necessary. . This cleaning passage 23 is directed against the spindle-shaped element 13 by a number of outlet openings in the manner described below.

  The cleaning passage 23 is initially connected to a ring passage 24 surrounding the spindle-shaped element 13. Two outlet openings 25 and 26 exit from this ring passage 24 somewhat directly. In the case of a spindle-shaped element 13 moved away from the fiber feed passage 8, the first outlet opening 25 is designed as a ring opening surrounding the spindle-shaped element 13, which is closed in the operating position as shown in FIG. It has been. The second outlet opening 26 is connected to the yarn withdrawal passage 10 via the intermediate passage 27 and is directed to the inlet opening 15 of the yarn withdrawal passage 10.

  The spindle-shaped element 13 can be cleaned from its outer contour to the inlet opening 15 of the thread withdrawal passage 10 via an outlet opening 25 designed as a ring opening. The inside of the yarn drawing passage 10 is cleaned through the second outlet opening 26.

  As described above, the first outlet opening 25 is closed when the spindle-shaped element 13 is not moved away from the fiber feed passage 8. This can be achieved by the spindle-shaped element 13 including a region 28 having a smaller outer diameter and a region 29 having a larger cylindrical outer diameter.

  When the spindle-shaped element 13 is moved away from the fiber feed passage 8 as shown in FIG. 2, the first outlet opening 25 in the form of a ring opening is opened. In contrast, as shown in FIG. 1, when the spindle-shaped element 13 is in its operational position, this ring opening is closed by a sealing gap 30 due to its diameter ratio. However, if necessary, pressurized air can continue to be blown through the intermediate passage 27 and the second outlet opening 26 into the yarn draw-out passage 10 into the fiber supply passage 8 so that the yarn end to be spliced Returning to the draft device 4 by the injection action can be achieved. In this way further functions can be assigned to the cleaning passage 23.

  In this respect, if necessary, pressurized air entering through the pressurized air passage 16 and serving as air for the spinning process can also be supplied to the non-operating position as shown in FIG. Stated. This air then exits the pressurized air nozzle 11 so that the area of the fiber guide surface 14 can be further cleaned if necessary.

  As will be appreciated, the pressurized air is fed into the air jet spinning apparatus 1 via three different locations, each of which is controlled separately, ie via the pressurized air passage 16, via the conduit 21 and via the cleaning passage 23. Can be supplied.

1 shows a greatly enlarged view in an axial section of an air jet spinning device according to the invention during operation. Figure 2 shows a view of the same air jet spinning apparatus in a non-operating state.

Claims (3)

  An air jet spinning device comprising a fiber feed passage leading to a vortex chamber, further comprising a fiber draw passage arranged in a spindle shaped element exiting the vortex chamber and having an inlet opening, and further comprising a spindle shape A cleaning passage comprising a movable device for moving the element away from the fiber supply passage, and further comprising a cleaning passage having an outlet opening directed against the spindle-shaped element and connectable to a source of pressurized air. 23) is connected to a ring passage (24) surrounding the spindle-shaped element (13), from which the first outlet opening (25) is connected, and the spindle-shaped element (13) is connected to the fiber supply passage (8). Is designed as a ring opening that surrounds the spindle-shaped element (13) when moved away from the fiber feed passage (8 The second outlet opening (26) from the ring passage (24) to the thread withdrawal passage (10) through the intermediate passage (27) and to the inlet opening (15). An air jet spinning device characterized by being directed to the air jet spinning device.   The air jet spinning device according to claim 1, characterized in that the first outlet opening (25) is closed when the spindle-shaped element (13) is not moved away from the fiber feed passage (8).   The spindle-shaped element (13) includes a region (28) having a smaller outer diameter that opens the ring opening (25) when the spindle-shaped element (13) is moved away from the fiber feed passage (8); Furthermore, the spindle-shaped element (13) includes a region (29) having a larger outer diameter that closes the ring opening (25) by the sealing gap (30) when the spindle-shaped element (13) is not moved away from the fiber supply passage (8). The air jet spinning device according to claim 2.

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