Textiles: spinning – twisting – and twining – Apparatus and processes – Piecing up
Patent
1982-12-27
1985-02-05
Watkins, Donald
Textiles: spinning, twisting, and twining
Apparatus and processes
Piecing up
D01H 1500
Patent
active
044971664
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for ending or starting the spinning operation on an open-end spinning unit, in which the feed of fibers is controlled by means of a switching device, by which the connection to a spinning element or a delivery channel is alternately unblocked and blocked, and to an apparatus for carrying out this process.
Apparatuses of this type have already become known in a wide variety of designs (CS patent specification No. 115,022, GB patent specification No. 1,170,869 and German Offenlegungsschrift No. 1,901,442). The disadvantage of these apparatuses is either that during the reversal of the switching device, there is temporarily no delivery of fibers, so that they are left to themselves for a short time and can thus result in contamination of the machine to fly (Chech. patent specification No. 115,022), or that a valve is equipped with a flap-like or slide-like switching element which controls the path of the air and fibers. However, this switching element involves the danger that fibers will be caught or jammed and will then work free at an undesirable moment and penetrate into the spinning element, thus resulting in a fault in the spinning process which takes the form of a thread break, or at least an irregularity in the yarn in the shape of a thickened portion in the thread (GB patent specification No. 1,170,869 and German Offenlegungsschrift No. 1,901,442).
The purpose of the present invention is to avoid the abovementioned disadvantages and provide a process and an apparatus, by means of which reliable and uniform feeding of the fibers into the spinning element is guaranteed, while at the same time a switching device known per se is used for the fiber path.
This object is achieved, according to the invention because when the switching device is reversed, the fiber is taken out of the region of the particular fiber path to be blocked, and only then is this region blocked. Because the fiber flow is taken out of the region of the switching device which is blocked during reversal, even before this blocking operation is completed, it is impossible for fibers to be jammed here, since in this way there are no fibers in this region during the blocking of one of the two fiber paths. In principle, the fiber flow can be taken out of the region of the switching device to be blocked even before the start of reversal; however, in a case of an appropriate design of the switching device and/or of the fiber paths to the spinning element and into the delivery channel, it may also be sufficient if the fiber flow is prevented only in the last part of the reversing operation. It is merely necessary to ensure that the fiber path to be blocked is not yet blocked completely before the fiber flow has been taken out of this region. This ensures that those fibers still located in this blocking region from beforehand are delivered from this region before this fiber path is blocked completely.
Advantageously, when the fiber feed to the spinning element is blocked, that is to say when no fibers are in any case required in the spinning element for the spinning process, the fiber supply to the switching device is stopped, whereas, at least during the last part of the reversing operation to release the supply of fibers into the spinning element, the fibers are sucked out of the region of the reversing device which is to be blocked at the same time. On the one hand, because the fiber supply to the switching device is stopped and, on the other hand, because fibers are sucked out of the blocking region of the switching device, it is therefore impossible for fibers to be jammed in the reversing device.
Preferably, the fiber flow is influenced in the blocking region and consequently also the fibers are delivered from this region by controlling the volumetric flow rates of suction air through the switching device, and appropriately the cross-section of the fiber path leading to the spinning element is unblocked substantially more quickly than the cross-section of the fiber path leading into the delivery c
REFERENCES:
patent: 3354631 (1967-11-01), Elias et al.
patent: 4102116 (1978-07-01), Derichs et al.
patent: 4156341 (1979-05-01), Raasch
patent: 4384451 (1983-05-01), Elias et al.
Artzt Peter
Egbers Gerhard
Muller Heinz
Neher Heinz
Schubert & Salzer Maschinenfabrik Aktiengesellschaft
Watkins Donald
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