Textiles: spinning – twisting – and twining – Apparatus and processes – Open end spinning
Patent
1993-12-02
1995-05-16
Stodola, Daniel P.
Textiles: spinning, twisting, and twining
Apparatus and processes
Open end spinning
57301, 57302, 57414, 57415, 57417, D01H 400, D01H 1100
Patent
active
054149908
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The instant invention relates to a process for the spinning of a yarn by means of an open-end device with a spinning rotor in which the fibers are fed to a fiber guiding surface which widens in the direction of the spinning rotor, from which the fibers are deposited on a widening sliding surface of the spinning rotor after overcoming a gap, as well as a device to carry out this process.
The problem exists with open-end rotor spinning that the fiber substance in the produced yarn is not utilized optimally so that yarns of poorer quality than ring yarns are produced as a result. In a known device of the type mentioned above this problem is addressed in that the fibers to be spun are conveyed to a rotating fiber guiding surface of a guiding body which widens in the direction of the spinning rotor, from which they are transferred to the rotating inner wall of the spinning rotor (DE-OS 21 26 841). Although this principle results in considerable improvement of the yarn structure and characteristics. This advantage is however counteracted by the disadvantage that fiber loss occurs due to the fact that air streams out through the gap between the guiding body and the upper edge of the spinning rotor carry fibers as they pass from the guiding body to the inner wall of the spinning rotor. On the other hand this gap, of a certain size, is required as a certain quantity of air is needed to convey the fibers through the feed channel, this quantity of air having to be removed again after the fibers are separated from the air. The gap must be of sufficient size so that the required amount of air can be removed through it. Even when the fiber loss affects especially short fibers, this is a great disadvantage.
OBJECTS AND SUMMARY OF THE INVENTION
It is a principal object of the instant invention to improve the known principle of fiber drafting and thereby to improve the structure of the yarn while avoiding fiber losses. Additional objects and advantages of the invention will be set forth in the following description, or may be obvious therefrom, or may be learned through practice of the invention.
The objects are attained through the invention in that an air stream is guided through the gap into the interior of the spinning rotor and is then removed from the interior of the spinning rotor without passing the gap again. In this manner, an air stream which ensures that the fibers will overcome the gap and will be deposited on the inner wall of the spinning rotor from where they are then fed in the conventional manner to the fiber collection groove for spinning is produced at the point where the fibers are able to escape from the space enclosed by the fiber collection surface and the spinning rotor. Independently of whether the fiber guiding surface is stationary or rotates, a rotating air stream caused by the rotation of the spinning rotor is always produced along the fiber guiding surface and conveys the fibers fed to the fiber guiding surface to the end of the fiber guiding surface toward the gap. This circulating air stream then combines with the air stream introduced through the gap into the spinning rotor and is then removed together with it from the space enclosed by the fiber guiding surface and the spinning rotor without passing the gap again at any point on the periphery of the spinning rotor. It has been shown that the air to be removed thus reaches the center of the space enclosed by the fiber guiding surface and the spinning rotor and thus does not interfere with the conveying of fibers. This type of fiber feeding and air control leads to a considerable improvement of the yarn structure and to considerably better utilization of the load-bearing capacity of the spun fibers and thereby to a considerable increase in yarn strength and improved yarn characteristics.
The air stream entering the interior of the spinning rotor through the gap can be produced in different manners. In an advantageous embodiment of the process according to the invention, this air stream is produced by compress
REFERENCES:
patent: 3796034 (1974-03-01), Grau
patent: 3845612 (1974-11-01), Chisholm et al.
patent: 3859779 (1975-01-01), Furstenberg
patent: 4339910 (1982-07-01), Ali et al.
patent: 4510745 (1985-04-01), Kawabata et al.
patent: 4539808 (1985-09-01), Miyamoto et al.
Blazek Petr
Didek Stanislav
Rieter Ingolstadt Spinnereimaschinenbau AG
Stodola Daniel P.
Stryjewski William
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