Textiles: fiber preparation – Working – Picking
Reexamination Certificate
2000-05-22
2001-07-17
Calvert, John J. (Department: 3765)
Textiles: fiber preparation
Working
Picking
C019S105000, C019S200000, C019S204000, C019S205000
Reexamination Certificate
active
06260239
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of German Application No. 199 23 418.3 filed May 21, 1999, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to an apparatus for producing a fiber lap from fiber tufts and is of the type which has a substantially vertical chute (feed chute) of rectangular cross section. The chute has two facing wide vertical walls and two facing narrow vertical walls as well as a width dimension which is the horizontal distance between the two narrow vertical walls. The upper end of the chute is provided with a fiber tuft supplying device, while its lower end accommodates a device for withdrawing the fiber tufts and discharging them as a fiber lap. One of the wide walls of the chute is air pervious and has, along the chute width, a plurality of side-by-side arranged elements for varying the air flow in the chute at those locations.
As disclosed in German Offenlegungsschrift (application published without examination) 34 13 595, a series of parallelepiped-shaped bodies of identical width are arranged in an opening which is provided in a chute wall facing the air pervious chute wall and which extends along the width of the feed chute. Each body is horizontally shiftable by an electromagnet so that the cross section of the feed chute is variable at those locations, whereby the air flow may be altered. The electromagnets are coupled to a control device. The opposite end regions (edge zones) of the chute wall, as viewed along its width, are covered by a relatively wide body. A carding machine is arranged immediately downstream of the feed chute for receiving the fiber lap therefrom. As a rule, the fiber lap has a width of 1 m.
Particularly in roller card units which have a width of 2.50 m or more, a spreading of the fibers in the edge zones occurs. At the output of the roller card unit such a spread leads to a reduction of the desired weight at the edge regions of the web (edge regions of the delivered fiber lap) and thus necessarily leads to a reduction of the useful output width. Further, the excessively light web edges lead to a more pronounced soiling of the machine at the roll ends which requires a more frequent servicing (maintenance work) of the machine.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved apparatus of the above-outlined type from the discussed disadvantages are eliminated and which, in particular, provides for an increase in the useful width of the fiber web and a reduction of the waste at the edge regions.
These objects and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the apparatus for making a fiber lap from a mass of fiber tufts includes a generally vertically extending feed chute having relatively wide first and second walls facing one another and relatively narrow third and fourth walls facing one another. The distance between the third and fourth walls defines the width of the feed chute. Each first and second wall has a mid region and flanking edge regions. The first and/or second wall is provided with air outlet openings in a bottom wall region. The apparatus further has a device for charging the feed chute with fiber tufts at a top portion thereof, and a device for withdrawing the fiber tufts from the feed chute as a fiber lap at a bottom portion of the feed chute. A plurality of side-by-side arranged elements are positioned in a series on the first wall at a bottom portion thereof along the wall width. The distance between any given element and the second wall defines the depth of the feed chute at the given element. The elements in the mid region have a first dimension measured parallel to the wall width, and the elements in the edge regions have a second dimension measured parallel to the wall width. The first dimension is greater than the second dimension, and the elements in the mid region are at a greater distance from the second wall than the elements in the edge regions of the first wall.
By virtue of the measures according to the invention, a preservation of the desired weight at the edge regions of the fiber web (the edge regions of the delivered fiber lap), an increase of the useful width, a reduction of the soiling of the machine and a reduction of the maintenance frequency of the machine are ensured. The resulting web profile (the profile of the delivered fiber lap) advantageously provides for a combination of a feed-in width (which reduces edge soiling) with a possibly large delivery width of the web output of the roller card unit wherein the desired weight tolerances are observed and a weight increase in the edge regions is safely avoided.
The invention has the following additional advantageous features:
In the lateral regions of the feed chute a plurality of segments is provided; in the mid zone the segments are approximately 250-350 mm wide, while in the lateral regions their width is approximately 50-150 mm.
The elements are side-by-side arranged cover plates of an air pervious wall of the chute; the cover plates extend parallel to the chute width.
The elements are independently movable segments having air outlet openings.
Each segment forms a pivotally supported chute wall portion movable generally parallel to the depth dimension of the chute.
The wall elements are provided in the chute zone where the fiber lap is formed from the tufts, and each wall element is movable by a setting device.
A plurality of measuring members are provided to determine the density of the fiber lap along the width thereof.
The measuring members are connected with element-operating setting members via a regulating and control apparatus.
The measuring members are situated adjacent the fiber web discharged by the roller card unit or the carding machine.
Each element has an air pervious portion.
The chute wall situated opposite the elements is air pervious.
The fiber lap produced by the apparatus according to the invention is directly fed to an after-connected carding machine or a roller card unit.
REFERENCES:
patent: 4520531 (1985-06-01), Hergeth
patent: 4939815 (1990-07-01), Leifeld
patent: 33 15 909 (1984-11-01), None
patent: 34 13 595 (1985-10-01), None
patent: 85 34 080 (1987-05-01), None
patent: 87 13 681 (1989-03-01), None
patent: 33 28 358 (1993-01-01), None
Wiegel, “Einfluss der Flockenspeisung auf die Bandgleichmässigkeit”, textil praxis International, Oct. 1975, vol. 30, No. 10, pp. 1387-1391.
Calvert John J.
Kelemen Gabor J.
Trutzschler GmbH & Co. KG
Venable
Welch Gary L.
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