|Title of Invention||
A BACKING-ROLL ON A WINDING HEAD HAVING A TRAVERSING DEVICE
|Abstract||A backing roll on a winding head having a traversing device, for producing cross-wound bobbins from staple fiber yarn, which deflects the threads and supports the cross-woun bobbin, driven via the axis, its surface shell clamping the threads together with me surface shell of the backing roll, Characterized in that The backing roll (19, 24, 29, 32, 35, 39) has profiling which in operation causes the threads to release brie% from me clamping effect multiple times during the traversing movement oven the working width of the cross-wound bobbin (4).|
|Full Text||FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
COMPLETE SPECIFICATION (See Section 10, rule 13)
A BACKING-ROLL ON A WINDING HEAD HAVING A TRAVERSING DEVICE.
SAURER GmbH & CO., KG. of LANDGRAFENSTRASSE 45, D-41069, MONCHENGLADBACH, GERMANY, GERMAN Company
The following specification particularly describes the nature of the invention and the manner in which it is to be performed : -
The present invention relates to a backing roll on a
winding head, having a cross-winding device, for
producing cross-wound bobbins from staple fiber, yarn
according to the preamble of Claim 1.
Problems frequently arise in the conveyance qf high-speed threads. For example, in German Published Application 23 33 992, it is described that, in the production of chemical fibers, which may be spun from polyamides or polyesters, delivery speeds for fiber cables of more than 3000 m/min., for example, 6000 m/min., are used and the fiber cables, which comprise smooth individual filaments, lying essentially iparallel to one another, tend, at speeds this high, to jump apart at deflection points and form jams on rotating conveyor means. As may be inferred from German Patent Application 195 40 342 Al, at such thread speeds, difficulties arise due to the erratic runoff behavior of the threads running off of the conveyor surfaces, particularly if they are subjected to stretching methods which run at a high speed. To monitor the runoff behavior of the threads, the thread speed, which is to be as constant as possible, is measured using contact or backing rolls pressed against the bobbins. In this case, the contact rolls are not driven separately, but are set in rotation by the cross-wound bobbins through friction. For reasons of friction, the surfaces of the contact rollers are typically implemented completely smooth. Smooth contact rollers, however, tend toward jams. For filament threads, the tendency of the freshly spun thread to form jams also exists with very smooth rolls. This tendency is amplified by the contirluous clamping
process which acts on the thread. In order to prevent
the danger of jamming, it is suggested in German Patent
Application 195 40 342 Al that the contact rolls be
provided with dents distributed over the cylindrical
surface shell. This is to lead to a significant
improvement of the running behavjior of the threads over
the surface of contact rolls having a relatively small
diameter. In this case it has been shown that the
desired effect does strengthen as the surface
proportion of the depressions on the contact roll
surface increases, however, simultaneously, the
conveyor dffect on the threads is increasingly impaired
as the surface proportion of the depressions increases.
Therefore, to ensure the functionality of the contact
rolls, a I limit of the surface proportion of the
I depressions is considered necessary. The rolls profiled
i in this way are also used as drive rolls for driving
■the bobbins in a spooling machine for chemical threads.
The depressions on these driven rolls are implemented
as flat lengthwise grooves running parallel •' to the
axis. Thte grooves run practically transverse to the
running direction of the threads. In this way, slip and
oscillations may be avoided. Such a roll ■ may be
implemented as a high-gloss roll, a greater carreer
effect being achievable due to the action of friction.
Problems are not excluded even in spooling procedures
which run at significantly lower thread speed, for
example at a thread speed below 2000 m/min. German
Patent Application 199 08 093 Al, which forms the
species, describes a backing and/or pressure roll
having a smooth surface shell. The requirements for
jamming, as they are present in filament thread, do not
exist for staple fiber yarn. Therefore, it is not
advisable to use the measures described above in this
regard in the processing of staple fiber yarn as well.
During the production of cross-wound bobbins from
staple fiber yarns, the twist of the thread is reduced (untwisting) and, in the opposite movement direction, amplified (twisting), by the back and forth movement of the thread during the traversing procedure, as a function of the rotation of the thread supplied (S or Z twist) . If there is only a slight twist in the thread supplied, completely or largely untwisted places in the thread quickly occur. This leads to broken threads or to extremely thin places, Since the thin places only arise after the typical thread monitoring'devices, they are notj. recognized and are therefore also not repaired. Extremely thin places in spooled threads produce problems during furthe:: processing of the thread, which, far example, arise during unwinding of the thrpad and may lead to costly interruptions and faults in 'the final product. Together with untwisting of the thread, thiere is the danger of "interleaving", in which the threads are laid as loops on the surface shell of the cross-wound bobbin, and this may also lead f:o the problems described above. The thread spooled using the device according to German Patent Application 199 08 093 Al frequently has an undesired pronounced hairiness.
Neither the undesired hairiness nor the untwi'sting oL: the thread may be eliminated using the known rolls.
I ! The present invention] is based on the object of
improving known backing rolls for producing cross-wound
bobbins from staple fiber yarn.
This object is achieved according to the present invention by a backing roll having the features of Claim 1.
Advantageous embodiments of the present invention are the objects of the subclaims.
Using a backing roll according to the present
invention the untwisting and the "interleaving" of the
thread, with the disadvantageous effects such as thread
breaks or thin places, is largely or even completely
suppressed. Using transverse grooves, as they are known
from the field of chemical fiber and/or if or filament
thread, it would not be possible to provide a remedy of
this typi. The hairiness of the thread is. significantly
reduced, a reduction of a magnitude of approximately
20 percent or more being achievable.
The frequency of malfunctions may be reduced. This
leads to fewer idle times and reduces the number of
necessary interventions by the operating personnel. Not only may the efficiency of the production procedure be elevated, but also the thread quality and the quality of the finished product produced from the thread. .
In an embodiment of the backing roll which is simple, as well as easy and cost-effective to manufacture, the profiling comprises grooVes which each form an .angle a, which is at least 40 degrees, with a surface shell line parallel to the axis. This is preferably true for a backing roll in which angle a is equally large for all grooves.
The disadvantages listed above may be overcome particularly well using the backing roll according to the present invention if the grooves each extend at least once around the entire circumference of the backing roll.
The hairiness is most effectively suppressed using a
backing roll in which angle a is 90 degrees.
If, according to Claim 6, a backing roll is divided into regions in the axial direction, the effect of the
backing roll may be improved using an adjustment of respective angle a to the direction of the thread
supplied from the traversing thread guide.
A corresponding effect may be achieved using a backing
roll in which the grooves intersect on jthe surface
Using an alternative embodiment of the backing roll, in which the profiling comprises nubs distributed over the surface shell, the untwisting of the thread may also be reduced or avoided entirely.
Using a backing roll according to the present invention, the spooling process for threads may be improved in a simple way and an effect which increases quality and reduces costs may be achieved.
Further characteristics of the present invention are described with reference to the exemplary embodiments illustrated in the figures.
Fig. 1 shows a side view of a winding head of a spooling machine, which produces cross-wound bobbins, having a backing roll,
Fig. 2 shows a backing roll having profiling in the form of grooves,
Fig. 3 shows the backing roll of Fig. 2 in view A-A,
Figs. 4-6 show embodiments of backing rolls having
profiling in the form of grooves as
alternatives to the backing roll of Fig. 2,
Fig. 7 shows a backing rpll having profiling
comprising nubs on the surface shell.
A cross-winding machine, indicated as a whole with
reference number 1, is schematically shown in a side
view in Fig. 1. These types of cross-winding machines
typically have multiple identical winding heads 2
between their end sections, not shown here.! Spinning
cops 3, produced on a ring spinning frame, are
respioled into large volume cross-wound bobbins 4 on
these winding heads 2\ as is known and therefore not
described in more detail. Spinning cops 3 supplied are
positioned in unspooling head 5 and thread 6 is drawn
off for respooling. The individual winding heads
typical-ly have different devices which ensure orderly
operation of these working heads. Fig. 1 shows a thread
6, running from spinning top 3 to cross-wound bobbin 4,
a suction nozzle 7, and a gripper tube 8. Winding head
2 additionally has a splicing device 9, a thread
tightener 10, a thread cleaner 11, a paraffining device
12, a thread cutter 13, a thread tension sensor 14, and
an under-thread sensor 15. Spooling device 16 comprises
a creel 17, which is mounted so it is movable around a
pivot axis 18. During the spooling procedure, the
surface of cross-wound bobbin 4 lies against a backing
roll 19 implemented as a pressure roll and carries
along this pressure roll, which is not driven, via
friction. Cross-wound bobbin 4 is driven via the axis
of the cross-wound bobbin using a drive device, whose
speed may be regulated, positioned directly on creel 17
and/or integrated into creel 17. A cross-winding device
20 is provided for traversing thread 6 during the
i spooling process. Threadi 6 slides back and forth on a
guide (line 22 during its displacement by thread guide 21. After they are completed, cross-wound bobbins 4 are transferred using an automatically operating cross-wound bobbin changer! onto a cross-wound bobbin transport! device 23 and transported to a bobbin loading
station positioned at the end of the machine or the like.
Fig. 2 shows a profiled backing roll 24, seen from
guide line 22, which is divided into two segments 25,
26. Grooves 27 are introduced into the surface shell of
backing roll 24 as the profiling. Grooves 27 are each
implemented as a groove whose cross section remains
uniform as it runs in a spiral around rotational axis
28. Grooves 27 each form an angle a with a surface
shell line running parallel to the axis. The absolute
value of the deviation from the surface shell line
quantified using angle a is constant over the entire
i working width of backing roll .24. In the transition
from region 25 to region 26, however, the direction of
i grooves 27 changes, so that V-shaped profiling results
on the surface shell of backing roll 24. Grooves 27 are
distributed uniformly around the circumference of
backing roll 24 and have a uniform distance to one
another as may be seen in Fig. 3 which is not to
i scaLe in all details. Width B of grooves 27 is 3 mm and
depth T is 1.5 mm. The diameter of backing roll 24 is
Backing roll 29 in Fig. 4 has two grooves 30, 31 which
run in a spiral shape on the surface shell of backing
roll 29, each angle a being 80 degrees. The direction
of the deviation from the surface shell line running
parallel I to the axis is, however, different. Due to
this course, grooves 30, 31 intersect at regular
intervals. The profiling is adjusted in this way to the
i direction of the thread supplied in the edge zones of
the traversing region through which the effect of
backing roll 29 is improved in the edge zones.
Fig. 5 shows a backing roll 32 having grooves 33, which run in a plane transverse to rotational axis 34. Angle a is therefore, 90 degrees. The implementation of backing roll 32 is especially effective in the middle section of the traversing region.
Fig. 6 shows a backing roll 35 divided into three regions 36, 37, and 38. The profiling of middle region 36 corresponds to the profiling of backing roll 32 of Fig. 5. The profiling of both other regions 37, 38 corresponds to the profiling of backing roll 29 of Fig. 4. The implementation of backing roll 35 combines an improved effect in the edge zones, as is made possible by backing roll 29 of Fig. 4, with the particularly effective profiling in the middle section, which backing roll 32 of Fig. 5 has. Backing roll 39 illustrated in Fig. 7 has profiling made of nubs 40. Nubs 40 are flattened on top. In an alternative embodiment of the backing roll, not shown, the nubs are implemented convex.
The implementation of the backing roll according to the present invention is not restricted to the exemplary embodiments illustrated. The backing roll may, for example, have a larger diameter. Although a smaller diameter of the backing roll advantageously allows the traversing device to be positioned close to the cross wound bobbin, spooling operation is also possible using an alternative backing roll of 50 mm diameter.
1. A backing roll on a winding head having a traversing device, for producing
cross-wound bobbins from staple fiber yarn, which deflects the threads and
supports the cross-woun bobbin, driven via the axis, its surface shell clamping
the threads together with me surface shell of the backing roll,
Characterized in that
The backing roll (19, 24, 29, 32, 35, 39) has profiling which in operation causes the threads to release brie% from me clamping effect multiple times during the traversing movement oven the working width of the cross-wound bobbin (4).
2. The "backing roll accoraing to claim 1, characterized in that the profiling comprises grooves (27, 90, 31, 33) which each form an angle a of at least 40 degrees to a surface shell line parallel to the axis.
3. The backing roll according to claim 2, characterized in that the angle a is so large that the grooves (30, 31 33) each extend at least once around the entire circumstance of the backing roll (19, 29,32,35).
4. The backing roll according to claim 2, characterized in that the angle a is equal to 90 degrees.
5. The backing roll according to one of claims 2 to 4, characterized in that the angle a is equally large for all grooves (27,30,31,33).
6. The backing roll according to one of claims 2 to 4, characterized in that the backing roll (24, 35) is divided into regions (25, 26, 36, 37, 38) in the axial direction, the respective angle a being equally large within one region (25, 26, 36, 37, 38) and the angled a ot at least two regions (24, 36, 37, 26, 38) differ from one another.
7. The backing roll according to one of claims 2 or 3, characterized in that the grooves (30,31) on the surface she11 intersect.
8. The backing roll according to claim 1, characterized in that the profiling comprises nubs (40) distributed over me surface shell.
Dated this 13thday of November, 2002.
|Indian Patent Application Number||984/MUM/2002|
|PG Journal Number||30/2007|
|Date of Filing||14-Nov-2002|
|Name of Patentee||SAURER GMBH & CO.,KG.|
|Applicant Address||LANDGRAFENSTRASSE 45, D-41069, MONCHENGLADBACH, GERMANY.|
|PCT International Classification Number||B65H 54/06|
|PCT International Application Number||N/A|
|PCT International Filing date||2002-11-14|