Textiles: fiber preparation – Working – Drafting
Reexamination Certificate
2002-04-30
2003-05-27
Welch, Gary (Department: 3765)
Textiles: fiber preparation
Working
Drafting
C019S150000, C019S236000
Reexamination Certificate
active
06568040
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a condensing unit for condensing a bundle of textile fibres drafted in a spinning machine.
The field of application of the present invention is that of spinning machines having a plurality of adjacent spinning stations in each of which there is a drafting unit associated with a condensing unit for transforming a bundle of textile fibres, or roving, into a twisted yarn.
For a better understanding of the prior art and of the problems inherent therein, a conventional condensing unit will be described first of all with reference to
FIGS. 1 and 2
of the appended drawings.
In
FIG. 1
, a bundle of textile fibres or roving
1
is supplied to a drafting unit, generally indicated
2
, comprising three pairs of rollers
3
and
4
,
5
and
6
,
7
and
8
, which pull the roving along at increasing linear velocities in order to thin it gradually. The roving output from the drafting unit
2
then goes to a condensing unit
10
located downstream of the drafting unit, before being sent for twisting.
The condensing unit
10
comprises a lower fixed tube
11
of circular cross-section, connected to a suction source (not shown), by means of a manifold
12
. As shown in
FIG. 2
, the tube
11
, which is common to several spinning stations located side by side, has, in each station, a narrow suction slot
15
arranged on the path of and in the direction of movement of the roving.
A plurality of freely rotatable cylindrical sleeves
16
are mounted along the tube
11
, there being one sleeve in the region of each spinning station and each sleeve having a central perforated portion
17
which extends around the entire circumference of the sleeve and covers the corresponding slot
15
with a large margin. Each sleeve
16
is driven so as to move around the tube
11
by a pressure roller
18
of elastomeric material which presses the roving against the perforated portion
17
of the filtering sleeve
16
. The inside diameter of the sleeves
16
is of a size such that the sleeves can be mounted on the tube with a minimal clearance which does not hinder their rotation. The pressure roller
18
is rotated by the last pressure roller
7
of the drafting unit
2
, by means of a belt transmission
19
.
An example of this prior art is described in EP-1106719-A, which is incorporated herein by reference.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a condensing unit of the type discussed above, addressing principally the problem of keeping the region of the slots clean, preventing the formation of accumulations of fibres and dirt which may be deposited in the interface region between the sleeve and the tube and which may adversely affect the condensing operation.
REFERENCES:
patent: 5600872 (1997-02-01), Artzt et al.
patent: 6108873 (2000-08-01), Barauke
patent: 6161258 (2000-12-01), Stahlecker
patent: 6170126 (2001-01-01), Stahlecker
patent: 6332244 (2001-12-01), Camozzi
patent: 1 106 719 (2001-06-01), None
Marzoli S.p.A.
Welch Gary
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