Textiles: fiber preparation – Working – Drafting
Reexamination Certificate
2001-06-07
2001-12-25
Worrell, Danny (Department: 3765)
Textiles: fiber preparation
Working
Drafting
C057S315000, C019S261000, C019S244000
Reexamination Certificate
active
06332246
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a locating frame for units for drawing and compacting bundles of textile fibres.
The field of application of the present invention is that of spinning machines provided with a plurality of adjacent spinning stations, in each of which there is a drawing unit associated with a compacting unit, for transforming a roving or bundle of textile fibres into a twisted yarn.
FIG. 1
is a partially-sectioned side view of a drawing and compacting unit of a spinning station in a spinning machine including a plurality of stations (not shown) disposed side by side in a direction defined herein as a transverse direction.
With reference to
FIG. 1
, a bundle of fibres or roving
1
is supplied to a drawing unit, generally indicated
2
, which usually comprises three pairs of members that draw the roving along at increasing linear velocities in order to attenuate it gradually.
In the drawing unit
2
, a first pair of rollers
3
,
4
takes up the roving at a controlled linear velocity. The roller
4
is rotated in accordance with the arrow A and the upper counter-roller
3
is freely rotatable on an upper support
5
in order to be pressed against the roller
4
with the crude roving interposed between them A second pair of members of the drawing unit comprises belts
6
,
7
, of which the lower belt
6
is circulated by a motor-driven roller
8
at a linear velocity greater than the output velocity of the first pair of rollers
3
,
4
, and the upper belt
7
is circulated about an idle roller
9
and a bar
10
, both mounted on the upper support
5
. A third pair of drawing members comprises an idle upper roller
12
, pressed against a lower roller
11
which is driven with a linear velocity greater than that of the second pair of drawing members.
The roving output by the drawing unit
2
then goes to a compacting unit
13
disposed downstream of the drawing unit, before being sent for twisting.
The compacting unit
13
comprises a lower, fixed tube
14
connected to a suction source; the tube
14
, which is common to several spinning stations disposed side by side, has a narrow suction slot
15
arranged on the path of the roving and along its direction of advance, in each station. A filter element
16
which preferably consists of a movable loop of flexible textile material that covers the corresponding slot
15
with a wide margin, is circulated about the fixed tube
14
by an upper pressure roller
19
of elastomeric material which presses the roving against the filter loop
16
.
The path of each filter loop
16
is defined by the upper surface of the tube
14
and by a guide bar
17
provided with a resilient element
18
for keeping the filter loop
16
taut.
As a result of the suction, the fibres of which the roving
1
is composed are drawn towards the slot
15
and are squeezed together and compacted transversely on the filter surface
16
.
The thread output from the compacting unit
13
is distributed and wound, in known manner, on a spindle (disposed downstream and not shown), rotated at high speed. The rotation of the spindle, drawing in the thread supplied by the drawing unit, drives a traveller which runs on a circular track of the spinning ring and produces a twist in the fibres, about the axis of the thread; the pressure exerted by the roller
19
prevents the twist which rises from the spindle from being propagated upstream of the point at which the thread is released by the roller
19
.
The pressure roller
19
is rotated by the last pressure roller
12
of the drawing unit, by means of a belt transmission
20
. The peripheral velocity of the pressure roller
19
is slightly greater than that of the rollers
11
,
12
to ensure that the roving is not too slack in the section in which it passes over the suction slot.
SUMMARY OF THE INVENTION
The object of the present invention is to ensure the correct location of the axles on which the pressure rollers of the last pair of members of the drawing unit and of the compacting unit are rotatable. In particular, it is desired to keep the axles of the above-mentioned pressure rollers correctly spaced and parallel.
Another object of the invention is to keep the belts which transmit the rotation from the last pressure roller of the drawing unit to the pressure roller of the compacting unit correctly aligned.
These objects are achieved, according to the present invention, by a device having the characteristics defined in claim
1
.
Further important characteristics of the invention are defined in the dependent claims.
REFERENCES:
patent: 2696643 (1954-12-01), Dolling et al.
patent: 4391021 (1983-07-01), Kamel
patent: 4551887 (1985-11-01), Uematsu
patent: 4768262 (1988-09-01), Gunter
patent: 5303454 (1994-04-01), Stahlecker et al.
patent: 5915510 (1999-06-01), Dinkelmann et al.
Marzoli S.p.A.
Sughrue & Mion, PLLC
Worrell Danny
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