Needle ring with needles for the combing cylinder of an open-end

Details Needle ring with needles for the combing cylinder of an open-end Needle ring with needles for the combing cylinder of an open-end

1989-03-30

1991-05-28

Schroeder, Werner H.

Textiles: fiber preparation

Working

Combing

19115R, 19 98, D01B 124

Patent

active

050191101

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION AND THE STATE OF THE ART

Open-end spinning machines are equipped nowadays with essentially two types of combing cylinders, namely cylinders with all-steel sets and with cylinders with inserted needles. An all-steel set corresponds more or less to a punched and, thus, sharp-edged serrated blade inserted into slots of the cylinder.
Combing cylinders with all-steel sets possess an advantage as compared to needle cylinders that they may be used in almost all types of spinning frames, namely even if highly contaminated wool is to be spun, in contrast to the known needle cylinders which may only be used in the spinning frames of only some of the manufacturers of spinning machines. The advantage of needle cylinders resides in that they have considerably longer service lives as compared to cylinders with all-steel sets.


SUMMARY OF THE INVENTION

The novel combing cylinder with needles according to the present invention now possesses both the advantages of the cylinders with all-steel sets and the advantages of the known needle cylinders, namely, that it may be used in all types of open-end spinning machines and it has a service life at least as long as the needle cylinders known till now. It is characterized in that the needle cross-section is not circular as is known, but has either an oval shape or the shape of a rectangle having rounded corners, or else a shape intermediate these two shapes. In other words, the needles have flattened cross-sections and thus possess a lance-shaped tip. These needles are preferably so inserted in the ring as to have the shorter dimension of the needle cross-section run parallel to the ring axis. The arrangement allows the needle axes to extend radially, or to form -- at the foot of the needle -- an angle of up to 30.degree. with the radius of the ring. The angle at the tip of the needle as measured in a section perpendicular to the cylinder axis preferably has a value between 15.degree. and 45.degree..
Needles having flattened rather than circular cross-sections have been known for more than 20 years. As a matter of fact, the textile industry has been using -- for combing fibers, i.e. for processing the fiber materials before spinning -- needle strips in which such needles have been inserted. However, in the combing process the product is drawn relatively slowly through the needle strips serving as combs, whereas the needle cylinders of the open-end spinning machine known at least since 1970 rotate with at least 8000 rotations per minute, yielding a peripheral speed of the order of magnitude of 150 m/min. This significant difference in application is the reason for the fact that during 20 years, so to speak, the prejudice prevailed, that it would make no sense using needles with flattened cross-sections in needle rings of combing cylinders of open-end spinning machines. This prejudice has only been overcome after the inventors have succeeded in demonstrating the outstanding qualities of the needle rings of the invention.


BRIEF DESCRIPTION OF THE DRAWING

In the following are described embodiments of the invention by making reference to the appended drawings in which: FIG. 1 a side view of a needle ring of a combing cylinder, in which only the needles disposed, so to speak, parallel to the plane of the drawing are shown, FIG. 2 the associated side view in which, however, only a single needle is shown, FIG. 3 the detail of FIG. 2 identified by III, shown on a larger scale, FIG. 4 a circular needle cross-section, which is typical of prior art needles; FIG. 5 a flattened needle cross-section of the present invention drawn on the same scale as in FIG. 4, and FIG. 6 a front view of the needle of the present invention inserted into the associated hole and shown on an even larger scale.


PREFERRED EMBODIMENTS OF THE INVENTION

FIGS. 1, 2 and 3 illustrate the manner in which the needles 1 are inserted in the needle ring 2 which preferably consists of aluminum or brass. The ring has for example an inside diameter of 50 mm, and a wall thickness of 4 mm

REFERENCES:
patent: 304208 (1884-08-01), Lemaire
patent: 1115990 (1914-11-01), Toles
patent: 1323885 (1919-12-01), McBride
patent: 1944526 (1934-01-01), Perron
patent: 2028919 (1936-01-01), Parker
patent: 2261452 (1941-11-01), Reed
patent: 3646639 (1972-03-01), Burckhardt
Textilebetrieb, vol. 96, #4, Apr. 1978, "Ein Qualifiziertes Faseraufloseaggreagat fur OE--Rotorspinnsysteme".

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