Textiles: fiber preparation – Working – Carding
Patent
1993-12-29
1995-09-12
Crowder, Clifford D.
Textiles: fiber preparation
Working
Carding
19113, 19114, D01G 906, D01G 1534
Patent
active
054488001
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for separating impurities and/or fiber fragments and short fibers ("trash") from the fiber material which is guided along a curved path, in form of a fleece, about the axis of rotation of a roller or a drum, for example. The path is limited by an external casing comprising at least one opening being provided in the casing through which the impurities and/or trash are to be separated.
STATE OF THE ART
Separating apparatuses of the kind mentioned above are known in many places in the blowroom of a fiber-processing plant, and also in many places in a spinning mill. Examples of these are found in the following publications of prior art:
______________________________________ Country No. Owner Type of application
______________________________________
EP 23 597 Trutzschler On a rotating roller
EP 110 017 Rieter On a rotating roller
EP 250 126 Carding Spec.
On the swift of a
card
DE 33 36 323 Trutzschler On the swift of a
card
us 5 022 121 Hollingsworth
On the swift of a
card
DE 38 25 419 Trutzschler On the licker-in of
a card
DE 39 02 202 Trutzschler On the swift of a
card or (FIG. 9) on
the licker-in
DE 39 02 204 Trutzschler On a rotating roller
DE 40 18 311 Trutzschler On a rotating roller
US 4 009 562 Rieter Opening cylinder of
a rotor spinning
machine
US 4 972 352 Graf On the swift of a
card
DE 30 34 036 Hollingsworth
On the swift of a
card
DE 38 21 771 Jacobsen On the swift of a
card
______________________________________
In EP 388 791 (or U.S. Pat. No. 5,031,278) it has now been proposed to provide the casing "upstream" of the opening with a structured surface which is used, in particular, to make the fleece oscillate so as to use the centrifugal force, which also acts on the impurities in the fleece, to convey the impurities more easily to the surface in order to separate them on the edge of a knife and to carry them off by means of a suction device. The structure on the surface may be provided, for example, in the form of a clothing segment. It may also, however, be provided in fish scale-like or by knurlings or longitudinal grooves or longitudinal shafts. The longitudinal grooves or longitudinal shafts extend in the axial direction of the rotating roller, i.e., transversal to the direction of movement of the fleece.
THE INVENTION
The above-mentioned arrangement with the clothing segment has proved to be exceptionally effective. On the basis of a new explanation of the effect of this arrangement it is now the object of the present invention to propose arrangements derived therefrom which can be used, in particular, where clothing segments are undesirable (for reasons pertaining to costs, maintenance or technology).
The invention provides an apparatus for separating impurities and/or trash from fiber material which is guided in the form of a fleece by suitable means along a curved path, e.g., about the axis of rotation of a rotating roller or drum. The path of movement is limited externally by a casing, i.e., the outer mantle surface of the path is limited by the inner surface of the casing. The casing is provided with at least one opening, through which impurities and/or trash can be separated. That is, the casing extends to an opening adjacent one edge of the casing for passage of the impurities run off from a conveyed fiber fleece under centrifugal force.
In accordance with the invention, the casing is provided with at least one guide groove or guide opening extending in the direction of movement of the fleece and opening out into the separating opening to convey impurities thrown off form the conveyed fleece into the separating opening.
Usually, the longitudinal separating opening extends transversal to the direction of movement of the fleece and a plurality of guide grooves or guide openings are provided which are arranged parallel to one another.
Between the grooves or openings the casing continues to provide the fiber fleece with an inwardly directed guide surface which counteracts the escapin
REFERENCES:
patent: 3936911 (1976-02-01), Roberts
patent: 4014076 (1977-03-01), Slanik
patent: 4553288 (1985-11-01), Schneider et al.
patent: 4651387 (1987-03-01), Giuliani
patent: 4683152 (1987-03-01), Wada
patent: 5031278 (1991-07-01), Demuth et al.
patent: 5228170 (1993-07-01), Giuliani
patent: 5247721 (1993-09-01), Demuth et al.
Demuth Robert
Faas Jurg
Calvert John J.
Crowder Clifford D.
Rieter Machine Works
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