Title of Invention

SPINNING POST WITH FIBER GUIDANCE ELEMENT

Abstract ABSTRACT The invention relates to a spinning position (6), on a jet spinner, comprising a fibre guidance element (3). According to the invention, the splaying of the outer fibres of the fibre composite (1) for introduction, may be increased, and hence the quality of the yarn increased and also jamming of the fibre elements lying parallel to the guide element (34) may be avoided, whereby the introduction direction (34) of the fibre composite (1) is inclined to the direction of the fibre guide surface (5) at an entry edge (32) by an angle alpha and the entry edge (32) is arranged within the fibre guide element (3). Fig. 2
Full Text

Spinning position with fiber guidance element
The invention relates to a spinning position with a fiber guidance element according to the preamble of patent claim 1.
The present invention relates to the field of air-jet spinners. Air-jet spinners have a multiplicity of spinning positions. At every spinning position, a yarn is spun from an introduced fiber sliver. In this case, the fiber sliver is first attenuated, that is to say the amount of fiber per unit of length is reduced by drafting. Then the attenuated fiber structure is spun into a yarn at the spinning position by imparting twist. For this purpose, the spinning position has a fiber guidance element with a fiber guiding surface, which guides the fiber structure into a swirl chamber, where a yarn is produced in a spindle by the known vortex air-spinning process.
Owing to the very high speeds of the fiber structure at the transition from the drafting system into the spindle, the aim is to design the entry into the fiber guidance element upstream of the spindle optimally. High drafting system speeds lead to strong airflows in the region of the nip line of the delivery rollers. These air flows may lead to breaking away of the fiber structure. In Figure 1 there is shown a fiber guidance element designed as a sleeve 3 with a fiber guiding surface 5 arranged inside. From the pair of delivery rollers 2 of the upstream drafting system, a fiber structure 1 is guided through the sleeve 3.
EP 1 335 050 A2 proposes for this a sleeve in which two mutually inclined fiber guiding surfaces are arranged and, as a result, form a deflecting location inside. The deflecting location, formed as an edge, has the effect of increasing the proportion of free fiber ends on the surface of the fiber structure, by these ends lifting off. These free fiber ends are taken up by the vortex flow before the spindle. Increasing the proportion of free fibers also has the effect of increasing the proportion of wrapping fibers of the yarn and, as a result, the quality of a yarn spun in this way can be improved. Although this deflecting location improves the quality of the yarn, it does nothing to contribute to

improving the flow conditions where the fiber structure 1 enters the sleeve 3. When the fiber structure 1 enters the fiber guidance element 3, there is in particular also the risk that the fibers lying parallel to the direction of introduction 34 will become jammed at edges that are necessarily present.
The present invention is based on the object of providing a spinning position with a fiber guidance element and of providing a fiber guidance element with which the flow conditions even at the transition from the drafting system to the fiber guidance element are improved, in order subsequently to achieve better conditions for the spinning of the fiber structure.
This object is achieved by the spinning position provided in patent claim 1 and by the fiber guidance element provided in patent claim 8.
The solution according to the invention, whereby
the direction of introduction of the fiber structure is inclined by an angle of inclination in
relation to the direction of the fiber guiding surface at a deflecting location, for example
at an entry edge, and the deflecting location is arranged inside or at the edge of the
fiber guidance element;
produces significantly improved flow conditions and, in particular, a rolling or rocking
motion of the fiber structure can be effectively inhibited as a result. The deflecting
location, for example an entry edge, may be arranged at the edge of the fiber guidance
element, i.e. at the end face of the fiber guidance element (the end face 33 from Figure
2 described below), and by being set back or suitably positioned inside the fiber
guidance element.
How the exit of the fiber guidance element may be designed is left open by the invention. This can take place according to the teaching of document 1 335 050 A2. However, this configuration of the exit is not prescribed as obligatory by the invention.

Advantageous embodiments of the invention are provided in further claims.
The invention is explained in more detail below by way of example on the basis of a drawing, in which
Figure 1 shows a representation of a fiber guidance element and a pair of delivery
rollers of a spinning position according to the prior art in EP 0 854 214 A2
and EP 1 335 050 A2; Figure 2 shows a sectional representation of the fiber guidance element according
to the invention at a spinning position; Figure 3 shows a sectional representation that is more detailed than Figure 2 of a
fiber guidance element according to the invention.
To illustrate the stated problem and the solution provided by the present invention, a spinning position 6 of an air-jet spinner with a pair of delivery rollers 2 and a fiber guidance element 3 formed as a sleeve is shown in Figure 1 in a perspective view. A fiber structure 1 is guided through the fiber guidance element 3 and is subsequently spun into a yarn by imparting twist in the spindle 7 (not represented). The task of the fiber guidance element 3 is to introduce the fiber structure 1 optimally to the subsequent swirl chamber 36, in order that a yarn can be formed there by means of an air flow.
In the following context, the terms fiber guidance element 3 and sleeve 3 are used synonymously.
A fiber guidance element 3 is shown in Figure 2. The fiber structure 1 is transported in the direction 34 to the fiber guidance element 3. In order to achieve still better splaying of the edge fibers, a deflection is provided at the entry edge 32. The entry edge 32 is formed by an inclination between the direction of introduction 34 and the fiber guiding surface 5, arranged in the sleeve 3, and is arranged inside said sleeve 3. In this exemplary embodiment, an exit edge 17 is also provided, in order to achieve additional

splaying of the edge fibers. Provided at the end of the exit edge 17 is a twist stop 38. However, how the exit and the following introduction into the inlet mouth 9 of the spindle 7 must be designed is left open by the present invention. Arranged ahead of the inlet mouth 9 in the swirl chamber 36 is an air entry opening 37. Arranging the entry edge 32 inside the fiber guidance element 3 makes it particularly advantageous to design the entry with a run-in ramp 39 in such a way that the fiber structure 1 cannot become jammed as it enters.
Particularly advantageous dimensional specifications for the arrangement of the entry edge 32 are given below; reference is thereby made to Figures 2 and 3 simultaneously. It should be noted that, both together and on their own, these dimensional specifications make advantageous conditions possible for the entry of the fiber structure 1 into the sleeve 3:
i) The angle of inclination a between the fiber guiding surface 5 and the direction of
introduction 34 of the fiber structure 1 preferably lies in a range of values of 5° α 25°. ii) The direction of introduction of the fiber structure is inclined with respect to the
plane of the drafting system by an angle β, which preferably lies in a range of
values of 0° rollers 2, the entry edge 32 is at a distance a from said plane 35 which preferably
lies in a range of values of 9 mm sleeve 3 at the distance b from the upper end face 33 of the sleeve 3. The
distance b thereby preferably lies in a range of values of 0.01 mm distance c which preferably lies in a range of values of 0
vi) The run-in ramp 39 is inclined with respect to the fiber guiding surface 5 by an angle γ. The range of values preferably lies in a range of values of 100° As explained above, the values specified can be used both individually for the spinning position 6 or for the fiber guidance element 3 and in combination. How the fiber guidance element 3 is to be structurally designed is left open by the invention, for example a rounding may be performed at the entry edge 32.

List of the reference numerals and abbreviations used
1 fiber structure
2 pair of delivery rollers
3 fiber guidance element
4 fiber guiding channel
5 fiber guiding surface
6 spinning position
7 spindle
9 inlet mouth
17 deflecting location, exit edge at the fiber guiding surface of the fiber guidance element
30 plane of drafting system
31 nip line
32 entry edge at the fiber guiding surface 5 of the fiber guidance element 3
33 upper end face of the fiber guidance element 3
34 direction of introduction of the fiber structure before entry into the fiber guidance
element 3
35 plane formed by the axes of rotation of the delivery rollers 2
36 swirl chamber
37 entry opening air flow
38 twist stop
39 run-in ramp
α angle between fiber guiding surface 5 and direction of introduction 34 of the fiber
structure β angle between direction of introduction of the fiber structure and plane 30 of
drafting system
γ angle between run-in ramp 39 and fiber guiding surface 5 a distance of entry edge 32 from plane which contains the axes of rotation of the
delivery rollers 2 of the drafting system
b distance of entry edge 32 from upper end face 33 of the sleeve 3 c distance of entry edge 32 from plane of drafting system 30

Patent claims
1. A spinning position (6) of an air-jet spinner for producing a yarn from a fiber
structure (1), the spinning position (6) having a fiber guidance element (3) with a
fiber guiding surface (5) contained therein, to which the fiber structure (1) is
introduced;
characterized in that
the direction of introduction (34) of the fiber structure (1) is inclined by an angle of
inclination a in relation to the direction of the fiber guiding surface (5) at a
deflecting location (32), preferably an entry edge (32), and in that the deflecting
location (32) is arranged inside or at the edge (33) of the fiber guidance element
(3).
2. The spinning position (6) as claimed in claim 1,
characterized in that
the angle of inclination a between the direction of introduction (34) of the fiber structure (1) and the direction of the fiber guiding surface (5) lies in the range of values of 5° 3. The spinning position (6) as claimed in claim 1 or 2,
characterized in that
the fiber guidance element (3) has an end face (33) and in that the deflecting location (32), preferably the entry edge (32), is at a distance b from the end face (33) in the direction of the fiber guiding surface (5) of 0.01 mm 4. The spinning position (6) as claimed in one of claims 1 to 3,
characterized in that

the fiber guidance element (3) has a run-in ramp (39), which is inclined with respect to the fiber guiding surface (5) by an angle γ, which lies in a range of values of 100° 5. The spinning position (6) as claimed in one of claims 1 to 4,
characterized in that a drafting system is arranged upstream of the fiber guidance element (3) and in that the entry edge (32) lies outside the associated plane (30) of the drafting system.
6. The spinning position (6) as claimed in claim 5,
characterized in that
the plane (30) of the drafting system is inclined in relation to the direction of introduction (34) of the fiber structure (1) by an angle p which lies in the range of values of 0° 7. The spinning position (6) as claimed in one of claims 1 to 6,
characterized in that
the drafting system includes two delivery rollers (2) and in that the entry edge (32) lies at a distance a from the plane (35) formed by the axes of rotation of the delivery rollers (2), the distance a lying in the range of values of 9 mm 8. A fiber guidance element (3) with a fiber guiding surface (5) contained therein for a
spinning position (6) of an air-jet spinner,
characterized in that
a deflecting location (32), preferably an entry edge (32), is formed by the fiber guiding surface (5) and a run-in ramp (39) inside or at the edge of the fiber guidance element (3).
9. The fiber guidance element (3) as claimed in claim 8,
characterized in that

the fiber guidance element (3) has an end face (33) and in that the deflecting location (32), preferably entry edge, is at a distance b from the end face (33) in the direction of the fiber guiding surface (5) in the range of values of 0.01 mm 10. The fiber guidance element (3) as claimed in claim 8 or 9,
characterized in that
the fiber guiding surface (5) and the run-in ramp (39) are inclined by an angle γ, which lies in the range of values of 100° 11. The fiber guidance element (3) or spinning position (6) as claimed in one of the
preceding claims, characterized in that
the distance c between the deflecting location (32) and the plane (30) of the drafting system lies in the range of values of 0 mm Dated this 9 day of June 2006


Documents:

2044-CHENP-2006 AMENDED PAGES OF SPECIFICATION 15-07-2011.pdf

2044-CHENP-2006 AMENDED CLAIMS 15-07-2011.pdf

2044-CHENP-2006 EXAMINATION REPORT REPLY RECEIVED 15-07-2011.pdf

2044-chenp-2006 form-3 15-07-2011.pdf

2044-CHENP-2006 POWER OF ATTORNEY 15-07-2011.pdf

2044-CHENP-2006 CORRESPONDENCE OTHERS 04-04-2011.pdf

2044-CHENP-2006 CORRESPONDENCE OTHERS.pdf

2044-CHENP-2006 CORRESPONDENCE PO.pdf

2044-CHENP-2006 FORM-18.pdf

2044-chenp-2006-abstract image.jpg

2044-chenp-2006-abstract.pdf

2044-chenp-2006-claims.pdf

2044-chenp-2006-correspondnece-others.pdf

2044-chenp-2006-description(complete).pdf

2044-chenp-2006-drawings.pdf

2044-chenp-2006-form 1.pdf

2044-chenp-2006-form 26.pdf

2044-chenp-2006-form 3.pdf

2044-chenp-2006-form 5.pdf

2044-chenp-2006-pct.pdf


Patent Number 249339
Indian Patent Application Number 2044/CHENP/2006
PG Journal Number 42/2011
Publication Date 21-Oct-2011
Grant Date 17-Oct-2011
Date of Filing 09-Jun-2006
Name of Patentee MASCHINENFABRIK RIETER AG
Applicant Address Patente und Lizenzen, Klosterstrasse 20, CH-8406 Winterthur
Inventors:
# Inventor's Name Inventor's Address
1 STALDER, Herbert Vordere Bahntalstrasse 9, CH-8483 Kollbrunn
2 ZIEGLER, Kurt Alte Kirchheim-Strasse 9, 73230 Kirchheim-Nabern
3 ARTZT, Peter Hugo Wolf Strasse 16, 72766 Reutlingen
4 MULLER, Heinz Geibelstrasse 1, 72555 Metzingen
PCT International Classification Number D01H4/02,4/38
PCT International Application Number PCT/CH2004/000423
PCT International Filing date 2004-07-06
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 1941/03 2003-11-11 Switzerland