Note: Descriptions are shown in the official language in which they were submitted.
~740~8
The invention relates to a method and an apparatus for
warping on section warplng beams suitable for endlessly spun,
nontwisted or only slightly twisted or interlaced filament
yarns.
Such yarns are produced for example with high speed
spinning, stretch spLnning and stretch winding and also with
stretch twisting with slight protective twist. It is necessary to
bring the individual, ad;acent lying filaments of a thread to a
single thread end in these filament yarns, in order to prevent
loops and fluff from slipping in and to improve the workability of
the threads. The required thread body is obtained by inter-
lacing the rilaments with compre~sed air in an interlacing
nozzle. The iilaments of a thread a~ thus interwoven with
each other in more or less large interva7s.
With synthetic yarns, whose production essentially
involves the stages of spinning, stretching and section
warping, the interlacing has hitherto been carried out directly
after the spinning or stretching process. Each rapid spinning,
stretch spinning, or stretching position is thus equipped with
an interlacing nozzle, having an air supply and a braking
device. This requires a considerable technical expenditure.
Besides, the thread leaves the stretching process at high
speed, during the stretch spinning for example at 4000 m/min.
However, the higher the thread speed at which the thread must
be interlaced the more difricult it is to obtain sufficiently
narrow interlacing intervals. Also, the expenditure with
regard to the production and accuracy Or the nozzle and the
air consumption increase~ considerably.
The object of the lnventiion is to diminish the
technical expenditure and the air consumption and to obtain
a higher number of interlacing positione, particularly in
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~5~74~318
rapidly spun and stretch spun material.
According to the invention, there is provided a method
for warping on section warping beams, comprising drawing threads
off a bobbin creel via thread guide devices, a loop reed, a slub
detector, an oiling davice and a thread store, wherein the threads
are interlaced during the warping process.
For this purpose an interlacing device for the entire
thread warp i9 installed in the thread path on the warping
device, preferably between the loop reed and the slub detector.
In this interlacing device each thread runs through a separate
interlacing nozzle. All the nozzles of the blowing device
are densely arra~ged in a common housing in the manner of a
loop reed and are provided with a common air supply system.
The air supply ensues in such a way that the air is supplied
to the nozzle housing on one or several positions via a
control valve and a three-way valve in such a way that no
pressure differences can occur in the housing and thus from
nozzle to nozzle. While the control valve regulates the
compressed air which iB supplied to the nozzles constantly at
a constant pressure, a constant interlacing of the threads i9
obtained. By adjusting the set value on the control value,
the adjustmcnt of the desired thread end can follow. During
an interruption of the warping process, produced by a slub
for example~ the three-way valve has the object of
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1~74~3188
interruptin~ the air supply at the same moment in time and Or
clearing an openin~, throu~h which the air pressure can
decrease ~s fast as possible in the nozzle housing, so that
the threads are not interlaced excessi~ely strongly at the
batchin~ position. Therefore the valve i9 in~talled close to
the housin6 Its actuating control is coupled to the control
of the warpin~ machine in such a way that it stops the air
supply simultaneously with the disconnection of the machine
and opens a short while before starting upon connection oi the
machine.
The following advantages are obtained with the invention:
A considerably better thread body is obtained. The
better thre~d body is obtained with a lower air consumption.
During the entire thread production, fewer disturbances
occur through thread breaka~es and slubs, since the interlacing
proce~ure follow~ under lower pressure, under which the
individual filament~ are less stres~ed. Furthermore, it is
displaced to the end of the process for producing threads.
It can no longer influence the spinning process, particularly
during stretch spinning and rapid spinning.
Tlle operation o~ reeding the threads to the ~tretch
spinning machine is simplified, ~ince they are not ~ed from
the interlacing nozzle. This procedure must also follow
during each change of bobbins or at least after each cleaning
o~ the spinning nozzles. According to the invention, however~
the threads are only seldom to be drawn in to the interlacing
device, since the new thread is tied to the outgoing bobbin
during a bobbin change on the warping device. Thus handling
i~ considerably dlminished overall during yarn production.
The technical expenditure is also diminished considerably,
since only one more common housing and one air supply are
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1~74088
required -~or the entire thread warping or the total number
of nozzles (up to 2000).
Insert A
In the accompaying drawings:
Figure I is a side and front elevation of an interlacing device
forming part of an embodiment of the apparatur~ according to
the invention;
Figure 2 shows a detail of the interlacing device of
Figure I, partly in section; and Figure 3 i~ a schematic dia-
gram of an apparatus according to the invention.
Figure l shows a view of the interlacing device. The
interlacing device is suitably constructed in two symmetrical
halves corresponding to the distribution~of the threads in
the warp coming from the right or from the left creel side.
Each half of the device comprises essentially a flat,
rectangular hollow body, the interlacing device housing (l),
which joins a channel (2) on two sides - as shown here -
or even on all four sides. The air supplied is distributed
into the nozzle housing through these channels. They have
such a cross-section th~t ~ubstantially no difference ln
pressure occurs along the nozzle housing.
The interlacing nozzles are inserted in the large ~rea
walls (3) of the nozzle housing. They are arranged in a grid,
which correspond~ to the supply of the threads from the creel,
that i9, in such a way that the threads do not have to run
across each other. The compressed air required ior inter-
lacing the threads i~ fed to the distributing channels (2)
Or the nozzle housing (l) via the three-way valves (4).
These valve~ are coupled with the control of the warping
1074(~88
machine in such a way that they release the air ~upply (5) -
in an adjustable time - shortly ~efore the start of the warp-
ing machine, so that the required air pressure can build up
before the thread warp begins. Furthermore, they close the
air supply immediately upon disconnection of the machine and
clear the way (6) for the rapid release of the air cushion
in the nozzle housing. The air supply follows additionally
via a control valve, upon which the pressure in the nozzle
housing is regulated to correspond to the pressure
mea~uring apparatus (7). The entire interlacing device i8
supported in a frame (~).
Figure 2 shows the interlacing nozzles (9) and their
installation in the nozzle housing. The interlacing nozzles
consist essentially of a cylindrical body with an axial thread
guiding channel (10) of 1.5 to 2.5 mm, pre~erably 2 mm,
diameter. The thread guiding channel has a funnel-shaped
inlet with an angle of taper o~ 20 to 30 and a9 ou~let, a
ceramic thread guiding eye (11) with an opening of 0.5 to 1.5
mm, preferably 1 mm diameter. The ceramic thread guiding
eye saves the threads from being fixed behind the nozzle by an
eye reed. A nozzle channel (12) with a diameter of 0.7 to
1.2 mm, preferably 1 mm, runs perpendicularly through the
thread guiding channel. The nozzles are formed at the same
time as traction rotors, which take up the inner pres~ure on
the housing walls (3). In this way the internal pressure
also acts as a thrust on the nozzle packings (13). A
distance box (14) with a hole for releasing the nozzle channel
prevents the housing wall~ ~rom coming together during
insertion Or the nozzles.
~07~08~3
Figure 3 shows the coordination of the interlacing
device in a warping device~ The threàds to be drawn from
bobbins in a warping creel (15) first run through the thread
detector (16) and a loop reed (17), on which the thread
guiding loops are arranged in the same grid as the interlacing
nozzles in the interlacing device. Then they enter the
interlacing device (18). The threads are drawn in in a simple
manner with a thread eye pistol. After the interlacing device,
the threads are joined together in an inlet reed (19) on a
level wlth the thread warp, which is then wound on to a
section warping beam (24) after passing a slub detector
(20), an oiling device (21), and a yarn store (22) on the
warping machine (23).
