Textiles: spinning – twisting – and twining – Apparatus and processes – Open end spinning
Patent
1995-05-03
1997-02-18
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Open end spinning
57406, 57407, 57411, 57413, D01H 400
Patent
active
056032102
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device to convey fibers to the fiber collection groove of an open-end spinning rotor with a fiber guiding element extending coaxially into the spinning rotor and provided with an inner circumferential surface in the form of a fiber guiding surface into which a fiber feeding channel lets out tangentially.
In a known device of this type (DE-OS 2,319,428) a channel-shaped fiber guiding element is provided, along the circumferential wall of which the fibers are conveyed in a spiral to the spinning rotor. This channel has a cylindrical cross-section or a cross section representing a substantial portion of its length and tapering in the direction of the spinning rotor. Such a channel-shaped fiber guiding element not only requires much space but also has most certainly no positive influence on the fiber feeding into the spinning rotor. It has been shown for example, that the fibers become caught in the channel-shaped fiber guiding element and even lead to clogging. This known device could therefore not be introduced in practice.
OBJECTS AND SUMMARY OF THE INVENTION
It is therefore a principal object of the instant invention to create a device which is space saving and makes it possible to achieve trouble-free spinning operation as well as the production of high-quality yarns. Additional objects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned by practice of the invention.
The objects are attained through the invention in that the spinning rotor is covered by a rotor cover whose side towards the spinning rotor contains the fiber guiding element, the inner circumferential surface of which includes a divergence angle opening in the direction of the spinning rotor. The fiber guiding element is in this case so small and compact that it fits in the rotor cover. The invention furthermore ensures undisturbed fiber feeding into the spinning rotor since its widening inner circumferential surface imparts a motion component in direction of the spinning rotor to the air which conveys the fibers and thereby also to the fibers themselves. Catching of the fibers due to centrifugal force is thereby prevented.
To make low-cost fabrication possible, the fiber guiding element is advantageously an integral part of the rotor cover.
In an easily fabricated embodiment of the invention, the inner circumferential surface of the fiber guiding element widens in the manner of a cone in the direction of the spinning rotor.
The divergence angle increases preferably from the outlet of the fiber feeding channel in the direction of the spinning rotor. In this manner, the friction effect which is produced by the inner circumferential surface of the fiber guiding element upon the fibers is counteracted so that even when the distance between the outlet of the fiber feeding channel and the spinning rotor is greater, fibers are reliably prevented from catching on the fiber guiding element.
In an advantageous embodiment of the device according to the invention the enlargement of the divergence angle is continuous, whereby the inner circumferential surface of the fiber guiding element is preferably arched in a convex manner.
In another advantageous embodiment of the invention, the increase of the divergence angle is discontinuous, i.e. in steps. In this case, the inner circumferential surface of the fiber guiding element is preferably composed in the axial direction of at least two longitudinal segments with different divergence angles. It has been shown to be advantageous for the longitudinal segment into which the fiber feeding channel lets out to be made in the form of a conical surface. The longitudinal segment of the fiber guiding element which is towards the spinning rotor can also be made in the form of a conical surface in that case.
In another advantageous embodiment of the invention, an additional convex longitudinal segment is provided between two conical longitudinal segments of t
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patent: 3910023 (1975-10-01), Muller
patent: 4565064 (1986-01-01), Iwasaki et al.
patent: 5414990 (1995-05-01), Blazek et al.
Blazek Petr
Didek Stanislav
Stejskal Alois
Rieter Ingolstadt Spinnereimaschinenbau AG
Stryjewski William
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