JPH05209324A - Rotor-type open end spinning frame - Google Patents

Abstract

PURPOSE: To obtain the above apparatus with which fibers are adequately handed over on the sliding surface of a miniaturized spinning rotor and an opening roller is cleanly maintained by parting the smallest cross section of a fiber feeding duct from an outlet formed as a specific slit. CONSTITUTION: The smallest cross section 24 of the fiber feeding duct 5 is parted from the outlet 18 and the axial height of the spinning rotor 6 in the outlet is made smaller than the ideal diameter of the smallest cross section. The diameter of the circular plane corresponding to the smallest cross section is defined as the ideal diameter. The fibers are exactly discharged to the sliding surface 21 sufficiently apart from an collecting channel 22 in spite of a sufficient air flow rate.

Description

Detailed Description of the Invention

[0001] The present invention is a rotor type open-end spinning device, which comprises a spinning rotor having a fiber collecting groove and a sliding surface that conically expands with respect to the groove, and is open to the sliding surface. The outlet of the fiber feed line that narrows in the fiber transport direction starting adjacent to the fiber roller is directed, and further comprises a housing for housing the spinning rotor, which is connected to the negative pressure source and A cover having a protrusion protruding to the open end of the rotor leaving an overflow gap for the carrier air, the protrusion including the outlet of the fiber supply line;
The fiber feed line starts adjacent to the opening roller with a width corresponding to the working width of the roller and its outlet is larger in the outer peripheral direction of the spinning rotor than in its axial direction. Regarding

Devices of this type are described in DE 37 04 4
Known from 60 A1. In the construction of the known device, the outlet of the fiber feed line exhibits a minimum cross section, which is large enough to allow sufficient carrier air flow through the fiber feed line by virtue of the special construction. That is, the amount of carrier air is
It is determined by the fact that fiber debris must be prevented in the area of the opening roller. The feeding of the supplied fibers to the sliding surface of the spinning rotor should be carried out, on the one hand, well away from the fiber collecting groove and, on the other hand, securely away from the open end of the spinning rotor. The height of the fiber supply line must therefore be kept as small as possible in the axial direction of the spinning rotor in the known device. Moreover, the outlet in the outer peripheral direction of the spinning rotor is usually formed wider so that a sufficient amount of air can be supplied from the outlet of the fiber supply pipe. The problem with the height of the axial exit of the spinning rotor arises especially in high-revving rotor open-end spinning machines using particularly small spinning rotors with a diameter of 30 mm or less. Known devices have shown measures in the right direction, but are still inadequate.

Rotor-type open-end spinning machines with so-called fiber guide partitions are known, for example as described in DE 37 19 959 A1. Such a fiber guide partition itself has the purpose of separating the fibers to be fed to the sliding surface from the yarns to be drawn from the fiber collecting grooves of the spinning rotor. Such a fiber guide partition can guide the fibers to the sliding surface reliably away from the fiber collecting groove even in the case of a relatively short fiber supply line. But,
The fiber guide dividers used in commercial machines have the disadvantage that the supplied fibers are not sufficiently stretched and collimated due to the short fiber supply lines that precede them.

It is an object of the present invention that a device of the type mentioned at the outset can be spun by means of a small spinning rotor, the fed fibers being properly delivered on the sliding surface of the spinning rotor and the fiber feed pipe being provided. The configuration is such that the amount of air passing through the path is sufficient from the viewpoint of maintaining the cleanliness of the fiber opening roller.

The purpose is to have a minimum cross section of the fiber feed line away from the outlet, which also has a slit whose height in the axial direction of the spinning rotor is substantially smaller than the ideal diameter of the minimum cross section. And is achieved by defining this ideal diameter as the diameter of the circular plane that corresponds to the smallest cross section.

Therefore, the smallest cross section of the fiber feed line that is narrowed to that extent is returned to an area where occupying the size of the cross section for a sufficient air flow does not cause structural difficulties. Since the height of the outlet of the fiber supply pipe in the axial direction of the spinning rotor can be kept sufficiently small due to the specifications as a slit, most fibers sent to the sliding surface have a sufficiently long sliding distance to the fiber collecting groove. Have. Moreover, the exit cross-sectional area at the exit can be of a sufficiently large size, because in the outer peripheral direction of the spinning rotor, not so strict accuracy of fiber supply is required. It is not important at what angle of the circumference the fiber hits the sliding surface. Only with regard to the distance from the fiber collecting groove and the distance from the open end of the spinning rotor, strict accuracy is required.

In an advantageous configuration of the invention, the length of the fiber supply line corresponds to at least twice the average staple length of the fiber material to be spun. A sufficiently long fiber supply line has the advantage that there is some stretching of the fibers therein. The fiber supply line has the effect of aligning the fibers, which is also caused by the acceleration of air in the direction of fiber transport. It is possible to combine good fiber drawing with very precise feeding of the sliding surface without reducing the air efficiency.

[0008] Advantageously, the slit is limited by the fiber guide surface which is close to the sliding surface on the side facing the fiber collecting groove. Thereby, the fibers are particularly reasonably fed to the sliding surface of the spinning rotor.

Advantageously, the smallest cross section of the fiber supply line has a circular plane. Round fiber feed lines have proven to be particularly advantageous in terms of fiber orientation. However, once the fibers have been bundled, it is no longer a disadvantage if the cross section of the fiber feed line is changed near the outlet. Therefore, in the configuration of the present invention, the slit has a rectangular cross section. Then, on the one hand, a sufficient air flow rate, which is not less than that of the smallest cross section, is obtained, and on the other hand, the precise target direction for feeding the fibers to the sliding surface is obtained.

Advantageously, the length of the slit is approximately equal to the radius of the spinning rotor. The fibers are thereby guided over the fiber guide surface over a sufficient length.

The fiber guide surface does not have to be perpendicular to the axis of the spinning rotor, but can be formed obliquely to it. Thereby, the fiber guide surface can be adapted to the natural direction of movement of the fiber.

In a particularly advantageous embodiment of the invention, the outlet is provided in a separate piece, including the end pieces of the fiber feed line.
It is therefore completely free with regard to the production of the outlet, since the outlet can be produced separately from the fiber feed line and there are practically no restrictions on its shaping. That is, it is difficult to make the fiber supply conduit having an integral structure starting from the working width of the fiber opening roller to have a round cross section later and finish the rectangular shape again at the exit. However, such molding is possible with separate components.

Advantageously, this separate member is replaceable for adaptation to different fibrous materials and / or spinning conditions. Therefore, the delicate part of the outlet can be adapted to each condition, especially when using a spinning rotor having a small diameter while retaining the entire fiber supply line.

Rationally, the overflow gap at the outlet of the fiber supply line is reduced. This prevents air from flowing out of the front rotor edge, especially in subtle areas, and the supplied fibers being discharged in an undesired way without being sent to the fiber collecting groove.

Reasonably, the fiber guiding surface is formed as a circular segment. Thereby, the fed fibers can be fed to the sliding surface in a substantially tangential direction.

Preferably, the height of the slit is less than half the ideal diameter of the smallest cross section of the fiber feed line. Thereby, on the one hand a high air efficiency is achieved and, on the other hand, the fibers can be accurately fed to the sliding surface.

Other features and advantages of the invention will be apparent from the claims and the following description of some embodiments.

FIG. 1 shows only the components of the rotor open-end spinning machine which are necessary for the understanding of the invention. Other components not shown may be considered as conforming to today's conventional construction of rotor open end spinning equipment.

The device according to FIG. 1 comprises an opening roller 1, which is provided on its outer circumference with an attachment 2 consisting of needles or saw teeth. The opening roller 1 is supported in a housing 3 and is also shown in a manner not shown.
Driven outside. On the operating side, the opening roller 1 is closed by the cover 4.

A fiber bundle is supplied to the fiber-spreading roller 1 by a supply device (not shown), and the fiber bundle is combed by the fiber-spreading roller 1 to be divided into individual fibers. The fibers separated by the fiber-spreading roller 1 are supplied to the spinning rotor 6 via the fiber supply pipe 5. The fiber supply line 5 starts with a first section 7 which is substantially tangential to the fiber opening roller 1 in the housing 3. Section 7 of fiber supply line 5
Is continued linearly by the section 8 which is a component of the cover 9. The cover 9 is movably mounted in a rotor open-end spinning machine in a manner not shown, so that its separating movement allows the spinning rotor 6 to be exposed on its front side. Since there is a sliding seam 10 with packing between the sections 7 and 8 of the fiber supply line 5, outside air does not enter the fiber supply line 5.

The spinning rotor 6 is arranged in a housing 11 forming a negative pressure chamber 12, and this negative pressure chamber is connected to a negative pressure pipe 13. The spinning rotor 6 comprises a shaft 14, which penetrates the rear wall of the housing 11 and is supported and driven outside the housing 11 in a manner not shown.

The cover 9 closes the housing 11 containing the spinning rotor 6 on the side of the open end 15 of the spinning rotor 6. A rotating sealing ring 16 is attached between the housing 11 and the cover 9. The cover 9 comprises a protrusion 17 which projects into the spinning rotor 6. This protrusion 17 comprises an outlet 18 of the fiber supply line 5 which will be described in more detail below.

A yarn withdrawing nozzle 19 is installed concentrically with the spinning rotor 6 in the projecting body 17, and a yarn withdrawing conduit 20 starts in this nozzle.

The spinning rotor 6 has a sliding surface 21, which is conical from the open end 15 of the spinning rotor 6 into a fiber collecting groove 22.
Has been expanded to. When spinning, the fibers are opened by the roller 1
Is conveyed by the air flow to the sliding surface 21 via the fiber supply line 5. In the spinning rotor 6, the air stream is separated from the fibers. The airflow is discharged from the annular gap 23,
This gap is formed between the open end 15 of the spinning rotor 6 and the protrusion 17 and the inner surface of the cover 9.

Due to the high centrifugal forces acting on them, the fibers slide on the sliding surface 21 into the fiber collecting groove 22 where they are gathered and bundled into yarn, which is the yarn drawing nozzle 19 and the yarn drawing line 20. Be pulled out by.

During spinning, it must be ensured that the fibers strike the sliding surface 21 sufficiently away from the fiber collecting groove 22 that they are slidable so that they are subjected to the stretching and parallelizing action. Furthermore, it must be ensured that most of the fibers are not sucked from the open end 15 of the spinning rotor 6 through the annular gap 23. This is particularly problematic, especially when high-speed rotation of the spinning rotor 6 is used, for example when a very small spinning rotor 6 with a diameter of the fiber collecting groove 22 of approximately 30 mm is used. The outlet 18 of the fiber supply line 5 cannot be reduced to the same size, in which case the required amount of air no longer flows in the fiber supply line 5. Further, if the amount of air is too small, fiber debris will be generated in the opening roller 1.

According to the invention, the smallest cross section 24 of the fiber supply line 5 is located away from the outlet 18, which is formed as a slit, as will be explained below. The smallest cross section 24 is preferably a circular surface, but it can also be oval or any other shape. Based on this minimum cross section 24, its diameter is made the ideal diameter and the outlet 18
An equivalent circular cross section that is obviously larger than the axial height h of the spinning rotor 6 forming the slit can be calculated.

In the embodiment according to FIG. 1, the outlet 18 is preferably in a separate member 25. Although this separate member 25 is a component of the cover 9, it is no longer integral with the member containing the section 8 of the fiber supply line 5, apart from the outlet 18. Thereby, the slit for the outlet 18 can be easily formed in the manner according to the invention. An intermediate member including the outlet 18 is inserted between the yarn withdrawing nozzle 19 and the actual fiber supply line 5, which forms a separate member 25. This separate member 25 can be considered as a thick underlying disc containing a cavity with a fiber guiding surface 26.

The structure of the fiber guide surface 26 and the slit shape of the outlet 18 can be calculated by experiments. Both are formed so that the fibers passing through the fiber supply pipe 5 are prevented from hitting the sliding surface 21 which is too close to the fiber collecting groove 22. The height h of the slit should be approximately half of the ideal diameter of the smallest cross section 24 so that the fibers hit the sliding surface 21 sufficiently to be bundled. As described below with respect to FIGS. 2 and 5, the slits are made wider in the outer circumferential direction of the spinning rotor 6. That is, the outlet 18 is formed like a sideways crenellated.

The device according to the present invention is designed so that the "veil fiber" (Schleie fiber) which directly enters the fiber collecting groove 22 and is concerned.
It has the advantage that virtually no fibers are produced. Especially very long veil fibers produce a very stiff "belly". The fibers that enter the fiber collecting groove 22 directly without making sufficient preliminary contact with the sliding surface 21 are wound along their entire length, which deteriorates the yarn quality. Of course, it is almost impossible to prevent this bale fiber, especially in the case of small rotors 6. However, it is essential to prevent extremely long bale fibers first.

In FIG. 2, a separate member 225 with a slit-shaped outlet 218 and a fiber guide surface 226 is visible. Also shown is the smallest cross section 24 of the fiber feed line 5 that strikes this separate member 225. The slit of the outlet 218 starts before the minimum cross section 24 and continues behind it in the direction of rotation A, so that the air ring rotating with the spinning rotor 6 promotes fiber movement. That is, the fibers emerging from the outlet 218 will be subjected to a "tailwind".

If the profile of the member 325 is formed according to FIG. 3, the fiber guide surface 326 begins in the area of the smallest cross section 24 with the wall 328. With this proper structure,
"Tail wind" is prevented.

While the embodiment according to FIG. 4 also prevents “trails”, it is not as effective as the embodiment according to FIG. 3 due to the construction of the wall 428.

The slit-like outlet 528 and the fiber guide surface 526 according to FIG. 5 are substantially in conformity with the embodiment according to FIG. 2 but are as tangential to the fibers as possible to the sliding surface 21 of the spinning rotor 6. A hollow partition 527 is installed on the fiber guide surface 526 to give a direction to hit the fiber.

As can be seen in FIGS. 2-5, the fiber guide surfaces 226, 326, 426, 526 are formed as circular segments. The minimum cross section 24 of the fiber supply conduit 5 has fiber guide surfaces 226 and 32, respectively, when viewed from the fiber conveying direction.
It is located in front of 6,426,526. From here, the fibers are discharged against the sliding surface 21.

Separate members 225, 325, 425, 52
5 allows for any molding method without manufacturing difficulties. Depending on the spinning conditions, the part of the outlet 18 can be designed very freely. The advantage here is that the known advantages of the long fiber feed line 5 are not lost despite the slit-like outlet 18.

The fiber guide surfaces 226, 326, 42 described above.
6,526 may be provided with various surface structures as necessary in consideration of wear to be avoided and for the purpose of making the fibers slippery. In particular, a smooth and dirt-free surface should be sought.

In the embodiment according to FIGS. 6 and 7, identical parts are provided with the same reference numerals as the previously described embodiments. Therefore, the description will not be repeated.

In the embodiment according to FIG. 6, a separate member 2
The part of the cover 9 carrying 5 is the fiber guide surface 2 of the outlet 18.
By having a ridge 29 directed towards 6, the slit-shaped outlet 18 of the fiber feed line 5 is further reduced in height. With this configuration, the slit becomes even smaller. However, since the outlet 18 is wide enough in the outer peripheral direction of the spinning rotor 6, the air flow rate is sufficient.

In the embodiment according to FIG. 7, the annular gap 23
Has been reduced in the area of the exit 18. In this case, a labyrinth packing 30 is installed which extends only in the area of the outlet 18. This prevents fibers in the area of the outlet 18 from being discharged from the front end 15 of the spinning rotor 6.

It is further provided in FIG. 7 that the fiber guiding surface 26 is as close as possible to the sliding surface 21. Therefore, when the cover 9 moves away from the spinning rotor 6, its movement must be such that it prevents the fiber guiding surface 26 from contacting the sliding surface 21. Appropriate forced guidance must be provided so that the sliding surface 21 is not damaged by the fiber guide surface 26.

According to the present invention, fibers having a stretched and bundled shape can be formed into a fiber collecting groove 22 despite a sufficient air flow rate.
Therefore, it is possible to discharge the sliding surface 21 with sufficient distance.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a rotor-type open-end spinning machine.

FIG. 2 is a partial cross-sectional view of the outlet portion of the fiber supply pipe viewed from the direction of arrow II in FIG.

FIG. 3 is a partial cross-sectional view of the outlet portion of the fiber supply pipe viewed from the direction of arrow II in FIG.

FIG. 4 is a partial cross-sectional view of the outlet portion of the fiber supply pipe viewed from the direction of arrow II in FIG.

FIG. 5 is a partial cross-sectional view of the outlet portion of the fiber supply pipe viewed in the direction of arrow II in FIG.

FIG. 6 is a partial cross-sectional view similar to FIG. 1 at the outlet of the fiber supply line.

FIG. 7 is a partial cross-sectional view similar to FIG. 1 at the outlet of the fiber supply line.

[Explanation of symbols]

 1 Opening Roller 3 Housing 5 Fiber Supply Pipeline 6 Spinning Rotor 11 Housing 15 Open End 18 Outlet 21 Sliding Surface 22 Fiber Collecting Groove 23 Annular Gap 24 Minimum Cross Section 26 Fiber Guide Surface h Height

Front Page Continuation (72) Inventor Fritz Stahlecker Germany 7347 Bato, Uberkingen, Joseph-Nighthardt-Strasse 18

Claims (12)

[Claims] 1. A rotor type open-end spinning device, comprising a spinning rotor having a fiber collecting groove and a sliding surface that conically expands with respect to the groove, and the fiber is opened to the sliding surface. The outlet of the fiber feed line that narrows in the fiber conveying direction starting adjacent to the roller is directed, and further comprises a housing for housing the spinning rotor, which housing is connected to a negative pressure source and also the spinning rotor. A cover having a protrusion protruding toward the open end of the fiber leaving an overflow gap for the carrier air, the protrusion including the outlet of the fiber supply line, the fiber supply line being adjacent to the opening roller. In a rotor open-end spinning machine, which starts with a width that matches the working width of the roller and whose outlet is larger in the outer circumferential direction of the spinning rotor than in its axial direction, the fiber feed line (5)
The minimum cross-section (24) of the is away from the outlet (18), and this outlet (18) has its axial height (h) of the spinning rotor (6) the ideal diameter of the minimum cross-section (24). A rotor open-end spinning machine, characterized in that it is formed as a slit which is essentially smaller than, and this ideal diameter is defined as the diameter of a circular plane corresponding to the smallest cross section (24). 2. Rotor open-end spinning device according to claim 1, characterized in that the length of the fiber feed line (5) is equal to at least twice the average staple length of the fiber material to be spun. 3. The fiber guide surface (2) which is in close contact with the sliding surface (21) on the side facing the fiber collecting groove (22).
6, 226, 326, 426, 526), and the rotor type open-end spinning apparatus according to claim 1 or 2, wherein 4. The smallest cross section (24) of the fiber supply line (5).
Is a circular plane, and the rotor type open-end spinning apparatus according to claim 1. 5. The rotor-type open-end spinning machine according to claim 1, wherein the slit has a rectangular cross section. 6. Rotor-type open-end spinning device according to claim 1, characterized in that the length of the slit is approximately equal to the radius of the spinning rotor (6). 7. The fiber guide surface (26) has a spinning rotor (6).
It is slanted with respect to the axis of.
7. The rotor type open-end spinning machine according to any one of 1. 8. A rotor-type open according to claim 1, characterized in that the outlet (18) is provided in a separate member (25) including the end member of the fiber supply line (5). End spinning equipment. 9. Members (25, 225, 325, 425, 225)
Rotor open-end spinning apparatus according to claim 8, characterized in that 525) can be exchanged to suit different fiber materials and / or spinning conditions. 10. Rotor-type open-end spinning device according to claim 1, characterized in that the overflow gap (23) is reduced in the area of the outlet (18). 11. Fiber guide surfaces (26, 226, 326, 26)
Rotor-type open-end spinning machine according to any one of claims 3 to 10, characterized in that 426, 526) are formed as circular segments. 12. The height (h) of the slit is smaller than half the ideal diameter of the smallest cross section (24) of the fiber supply line (5). Rotor type open-end spinning machine.