Textiles: spinning – twisting – and twining – Apparatus and processes – Open end spinning
Reexamination Certificate
1999-12-20
2001-09-18
Worrell, Danny (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Open end spinning
Reexamination Certificate
active
06289663
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of German Application DE 19859164, filed Dec. 21, 1998, herein incorporated by reference.
FIELD OF THE INVENTION
The present invention relates to a conduit plate adapter for an open-end rotor spinning device wherein the open-end spinning device includes a vacuum-loadable rotor housing with a rotating spinning rotor.
BACKGROUND OF THE INVENTION
Open-end rotor spinning devices of the above-indicated type typically comprise a cover element which seals a rotor housing during the spinning process by means of a lip seal in an airtight manner. The rotor housing is open to the front. The cover element comprises a bearing bracket for mounting an opening cylinder as well as bearing brackets for a swivel pin which are arranged orthogonally to the axis of the opening cylinder. A conduit plate adapter, which can be readily replaced, if necessary, is fitted into the cover element. The cover element is connected via this swivel pin to an associated spinning-box housing. Moreover, the opening-cylinder housing of a sliver opening device as well as the bearing housing of a sliver feeding cylinder are fixed on the cover element.
The individual fibers combed out of a feed sliver by the opening cylinder are transported via a so-called fiber guide conduit to the spinning rotor and spun by the spinning rotor into a yarn which can be continuously drawn off. As is known, for example, from German Patent Disclosure DE 197 12 881 A1, the opening-cylinder housing is connected to a receptacle in the cover element for the conduit plate adapter via a fiber guide conduit assembly which is formed in conduit sections. The fiber guide conduit assembly consists in its totality of two separate conduit sections, namely, a conduit section formed inside an insert portion of the fiber guide conduit assembly and another conduit section arranged in the particular conduit plate adapter.
When the engaged cover element is pivoted closed during the operation, the conduit plate adapter extends into the rotating rotor. It is assured in this manner that the mouth area of the fiber guide conduit is positioned sufficiently close to the fiber guide wall of the spinning rotor so that the individual fibers transported in the fiber guide conduit are fed onto the spinning rotor as prescribed. The conduit plate adapter also comprises a bore for fixing a yarn withdrawal nozzle adjacent to the mouth area of the fiber guide conduit.
The conduit plate adapter is coordinated for a certain rotor diameter. Thus, if, for example, it is necessary to replace the spinning rotor during the course of a change of a yarn batch, the conduit plate adapter must be replaced at the same time.
Open-end rotor spinning devices with such replaceably arranged conduit plate adapters are basically known and described, for example, in German Patent Disclosure DE 43 34 485 A1. In the spinning device of German Patent Disclosure DE 43 34 485 A1, the pivotably mounted cover element comprises an annular groove for inserting a lip seal element and a receptacle with conical contact surfaces which is open in the direction of the rotor housing. A conduit plate adapter is detachably fixed in this receptacle by means of screw bolts which extend through corresponding bores in the cover element and engage in fastening bores of the conduit plate adapter.
However, this type of fastening is disadvantageous in this known device since two machine screws must be removed in order to replace the conduit plate adapter, which is relatively time-consuming.
A similar open-end rotor spinning device is described in German Patent Disclosure DE 195 24 837 A1. However, the cover element in this device comprises a conduit plate adapter which is secured by a bar spring in the receptacle of the cover element. The conduit plate adapter can be rapidly and smoothly dismounted as needed by bending back the bar spring. In order to secure the conduit plate adapter, the bar spring fastened on one end to the fiber conduit plate engages in a tangential groove formed into the conical contact surface of the bearing body of the conduit plate adapter.
However, in practice, such a fastening method is only conditionally suitable for assuring a reliable seal of the conduit plate adapter which can be readily detached if necessary. An off-center introduction of force of the securing means can result, for example, in a tilting of the conical bearing body of the conduit plate adapter in the receptacle of the cover element with the consequence that problems with false air flowing can occur at the spinning devices.
German Patent Disclosure DE 198 36 073 describes an open-end rotor spinning device in which the detachable fastening of the conduit plate adapter on the cover element takes place in a non-positive manner via a magnetic coupling. That is, disk-shaped permanent magnets are introduced into the receptacle of the cover element which magnets correspond to a ferromagnetic component of the conduit plate adapter, preferably a steel disk.
This purely non-positive fixing of a conduit plate adapter in the receptacle of the cover element results in a simple fixing of the conduit plate adapter which can be readily and rapidly detached in case of need but is very reliable and exact during operation. However, in practice, the conduit plate adapter still needs improvement, especially in the area of the entrance of the fiber guide conduit.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to create a conduit plate adapter of the type described above which is optimized, in particular, regarding the shaping of its fiber guide conduit section and overcomes the aforementioned disadvantages.
The present invention addresses this objective by providing an improved fiber guide conduit section in a conical conduit plate adapter adapted to be attached to a receptacle of a cover element of an open-end spinning device having a vacuum-loadable rotor housing with a rotating spinning rotor. According to the present invention, the conduit plate adapter basically comprises a section of a fiber guide conduit for transporting fibers into the spinning rotor from an entrance opening of a non-circular cross section in the area of the conical surface of the conduit plate adapter to a fiber exit mouth. A replaceable yarn withdrawal nozzle is also fitted into the conduit plate adapted for withdrawing a yarn from the spinning rotor.
Advantageous embodiments of the invention are set forth in more detail herein.
The design of the conduit plate adapter, especially of the fiber guide conduit section, assures an optimal flow course inside the fiber guide conduit so that the individual fibers transported in this airflow are fed onto the guide surface of the spinning rotor aligned in stretched fashion to a very great extent. In particular, the exact adaptation of the entrance opening, which lies in the range of the conical contact surface, of the fiber guide conduit section running inside the conduit plate adapter to the inside cross section of the adjacent conduit end area of the conduit running in the section of the fiber guide conduit, has a positive effect on the spinning results.
In a preferred embodiment, the ratio of height to width of the entrance opening of the fiber guide conduit section arranged in the conduit plate adapter is between about 1:1.3 and about 1:1.4. That is, the fiber guide conduit is somewhat wider than it is high in the area of its entrance opening. The wider extents of the fiber guide conduit initially extend conically toward one another following the entrance opening and then form a cylindrical conduit section up to the mouth of the fiber guide conduit. Such a design results, in combination with the features described above, in a fiber guide conduit with advantageous flow without the disadvantageous or damaging hindrances of flow.
Further details of the invention can be gathered from a non-limiting exemplary embodiment presented in the following description with reference made to the drawings.
REFERENCES:
patent: 4854119
Kennedy Covington Lobdell & Hickman LLP
W. Schlafhorst AG & Co.
Worrell Danny
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