CS205481B1 - Spinning rotor for open-end spinning machines - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to an open-end spinning machine, and more particularly to a construction of a spinning rotor for an open-end spinning machine that can be used to produce yarns of low strength fibers with a low coefficient of adhesion,

Short wool fibers (noils, short-wool wool, regenerated wool, wool waste), cotton waste and other short-fiber material are contemplated.

Although open-end spinning has been known for a long time, ensuring a uniform yarn structure is still a problem. The fact that the uniformity and hence the quality of the yarn depends on the formation of the spinning rotor makes it possible to understand the efforts still being made to solve the problem of the spinning rotor by re-designing it, eventually. improvements.

Among others, a spinning rotor for open-end spinning machines (see, for example, DAS No. 1,535,012) is known, which is dish-shaped and has inwardly domed inner walls. As the tray is rotated, the fibers are thrown by centrifugal force onto the inner walls and are generally collected at the largest perimeter of the tray to be wound in the yarn.

The spinning rotor described allows to produce a uniform yarn using only raw materials. However, when the yarn is spun from mixtures of short waste fibers, the wool or the wool is separated. cotton, considerably lower yarn quality. This is due to the addition of fibers

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205 401 ee, during the formation of the yarn, also deposit virtually inseparable cloths such as impurities, scraps and other non-spinable sprays on the walls of the bowl. In the described construction of the spinning rotor, straightening and straightening of the fibers is not ensured, which also adversely affects the uniformity and strength of the yarn.

Furthermore, a spinning rotor for an open-end spinning machine (see, for example, U.S. Pat. No. 188,335), in the form of a funnel with an axial yarn draw-off channel, is known. The funnel walls have round through holes, which are spaced in the same odetupeoh over an oily surface and provide air extraction. When feeding single fibers, a fine layer of fibers is formed on the wall of the rotating funnel by the action of aerodyne and centrifugal forces.

This fibrous material is drawn into the draw-off duct and twisted into a finished yarn.

The above rotor offers the advantage that the impurities are thrown out of the bending space by the centrifugal forces. However, the spaced fibers have poor cohesiveness over the pleat of the funnel, and most of the fibers have a twisted shape which negatively affects the uniformity as well as the strength of the finished yarn.

A more advanced solution in this regard is the spinning rotor for open-end spinning machines according to DAS S. 2,506,645 * published Aug. 26, 1976. It is a disc-shaped design having a central yarn draw-off channel and a radial circumferential side the open cut-outs have the same width for a long time, which means that they have side edges extending parallel to one another.

When rotating the disc and extracting air through the radial slots, they receive the fibers, deposit them on the front face of the disc, on the four slots, and form the fiber ribbons which are drawn into the central take-off channel and twisted in the yarn. The fact that the fibers are deposited only along the radial slots makes it possible to increase the cohesion of the fibers as well as to direct a portion of the fibers in the direction corresponding to the radial slots. This contributes to better stsjnomsrrnrnosti and to higher strength of the produced yarns.

If the spinning process carried out using the aforementioned spinning motor is stabilized, problems may occur during the processing of poor-quality raw materials, such as short waste fibers and impurities fibers, for example. This is due to the fact that the stored fibers are subjected to uniform aerodynamic action over a long period of time, and consequently increases only slightly the thickness of the fiber ribbon from the periphery of the disk to its center. This results in a breakage of the fiber ribbon which occurs when the wedge-shaped cone of the fiber ribbon is deflected. It is understandable that the broken ribbons of fiber, only one, have an adverse effect on the quality values of the produced yarn, namely its uniformity and strength.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spinning rotor for open-end spinning machines in which the fibers are distributed along radial slots in such a way as to prevent oscillation of the fiber ribbon and thus its breakage.

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This object is achieved in the case of a spinning rotor for an open-end spinning machine in the form of a disc having an axial yarn draw-off channel as well as radial through-open cut-outs, according to the invention, in that the radial through holes narrow .

As a result, each fiber ribbon can be formed in such a way that it is considerably thicker near the take-off channel, but not near the periphery of the disc. Therefore, the specific tension of the fiber ribbon increases towards the take-off channel and decreases towards the periphery of the disc, resulting in increased stability of the spinning process as well as better uniformity of fiber ribbon formation and higher strength of the ribbon. In addition, the narrowing of the radial through-cuts ensures a reliable hold of the fiber ribbon on the periphery of the disc and prevents the end of the fiber ribbon from oscillating. This factor also has a positive effect on the stability of the open-end spinning process.

In the rotor according to the invention, a reduction in the breaking strength of 18% and an increase in the thread strength of 12% can be expected.

With regard to the manufacturing technology, the most efficient design of the radial cut-outs is a straight, side-to-side acute angle *

The described embodiment of the spinning rotor can bring the greatest success in processing a staple with uniform shear length and the same fiber displacement.

Suitably, each cut-out may have such curvilinear exponential side edges.

The spinning rotor with radially cut-out edges thus formed is most suitable for processing natural fibers and mixtures in which the fiber length distribution is controlled by the exponential distribution law. These are wool, cotton, linen and jute fibers, as well as chemical fibers with an exponential fiber length distribution.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an axial section of an open-end spinning machine according to the invention. FIG. 2 shows an embodiment of a spinning rotor according to the invention in which the radial cut-outs have straight side edges. (view in the direction of arrow A in FIG. 1) FIG. 3 shows an embodiment of a spinning rotor according to the invention in which the radial slots have exponential side edges (view in the direction of arrow A in FIG. 1).

Spinning rotor for open-end spinning machines It is designed in the form of a disc 1 (Fig. 1). The disc 1 has a central yarn draw-off channel 2 and radial cut-outs 2. These cut-outs 2 are open at the periphery of the disc 1. A paddle wheel 6 is mounted on the front surface of the disc 1. On the open-end spinning machine, a feeding device is arranged above the disc 1. Clamping devices are arranged below the disc 1, coaxial with the central exhaust duct 2. The disc 1 and the clamping device are connected by a rotary drive. The rotary actuator, clamping and feeding devices are not shown in the figures.

The radial through slots 2 of the disc 1 have a narrowing direction from the central part of the disc to the periphery of the disc, as shown in FIG. 2 of the accompanying drawing.

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Two embodiments of the spinning rotor according to the invention are preferred.

According to a first preferred embodiment, the radial apertures 2 of the discs 1 have rectilinear edges 6 and 6 which extend at an acute angle to each other (FIG. 2).

According to a second preferred embodiment of the spinning rotor, the radial bias cutouts 2 have exponential side edges 2 and 8.

The spinning rotor according to the invention flows in the following manner

When the disk 1 is rotated, the impeller 6 creates a negative pressure so that air is sucked through the radial slots 2. to the periphery of the disc and at the same time they move towards the radial slots with the Coriolis forces. As a result, a wedge-shaped fiber ribbon is formed along each cut-out 2 and is turned to the periphery of the disc 1 ^with its pointed cone.

As they move along the face of the disc, the fiber pencils are subjected to aerodynamic, centrifugal, spinning and yarn pulling forces. These forces cause the fibers to straighten.

Since the width of the 2 ° A cut-outs is centered towards the periphery of the disc 1, the suction effect of the air decreases towards the periphery of the disc. As a result, more fibers are deposited for a portion of the slots near the center of the disc, and the thickness of the fiber ribbon is therefore greater here than in the area of the slots near the periphery. As a result, the strength formed by the fiber ribbons increases and at the same time the likelihood of breakage is reduced. In addition, the tapering of the cut-outs 2 in the circumferential area provides a support surface for the ends of the fiber ribbons, thereby avoiding the occurrence of dynamic oscillations.

The specific exemplary embodiments described above allow various changes and modifications to be made without departing from the scope of the inventive idea deflated at the point of the appended object of the invention.

Claims (3)

SUBJECT OF THE INVENTION Spinning rotor for an open-end spinning machine in the form of a disc with an axial yarn draw-off channel as well as 1 with radially open cut-outs open on the circumferential side, characterized in that the cut-outs (3) have a narrowing (1) to its perimeter. 205 481 2. The spinning rotor according to claim 1, characterized in that each radial cut-out (3) has side edges (5, 6) formed in a rectilinear manner and which run at an acute angle to each other. Spinning rotor according to Claim 1, characterized in that each radial cutout (3) has curvature-shaped exponential side edges (7, 8).