Title of Invention

APPARATUS ON A DRAW FRAME FOR TEXTILE FIBRE SLIVERS HAVING A DRAWING SYSTEM WITH TOP ROLLERS THAT CAN BE LOADED AND RELIEVED OF LOAD

Abstract In an apparatus on a draw frame for textile fibre slivers with weighting of the top rollers of the drawing system of successively arranged pairs of rollers comprising a bottom and a top roller, in which, during operation, the top rollers are pressed against the bottom rollers by weighted pressing elements in pressing arms, wherein, when operation is suspended, the bearings of the top rollers are relieved of the weighting by the pressing arms, on interruption to continuous operation the top output roller or the top output rollers is/are capable of being relieved of loading in such a way that no or only slight pressure is exerted on the fibre slivers.
Full Text Apparatus on a draw frame for textile fibre slivers in
which the top rollers of the drawing system are loaded
and relieved of load
The invention relates to an apparatus on a draw
frame for textile fibre slivers with loading of the top
rollers of the drawing system of successively arranged
pairs of rollers comprising a bottom and a top roller,
in which, during operation, the top rollers are pressed
against the bottom rollers by weighted pressing
elements in pressing arms, wherein, when operation is
suspended, the bearings of the top rollers are relieved
of the loading by the pressing arms and upon
interruption to continuous operation the top output
roller or the top output rollers are relieved of
loading such that no or only slight pressure is exerted
on the fibre slivers.
During operation, the pressing arms are closed and
the pressing devices press the top rollers onto the
associated lower rollers of the drawing system. When
operation of the drawing frame is suspended,
particularly for a longer time period, the pressure
cylinders and hence at the same time the top rollers
are relieved of load, so that the rollers (roundness)
and their resilient coating are protected against
deformation. When the pressing arms are pivoted open
while the top rollers remain stationary on the lower
rollers, the top rollers exert a pressure on the bottom
rollers by virtue of gravity. Since the slivers are
positioned between the top and bottom rollers, the top
rollers, in their idle state, exert a pressure on the
slivers. During operation, particularly at high sliver
speeds of 1,000 m/min and above, the rollers heat up
substantially. The fibres frequently contain
substances that become sticky when heated, for example,

honeydew in the case of cotton and lubricating agents
in the case of synthetic fibres. When the draw frame
is at a standstill for a relatively long period -
especially for longer than the time required to
exchange full for empty cans at the output end of the
draw frame - for example, on sliver rupture, when
exchanging empty for full cans at the input end of the
draw frame, during operational disturbances and the
like, the top output roller(s) in particular, at the
roller nip with the bottom output rollers, press
against the substances clinging to the fibres and the
substances become sticky owing to the heat. The
disadvantage of this is that the slivers stick firmly
especially to the top roller or top rollers and, when
operation resumes, are entrained by the rotating roller
and wind undesirably around the roller. This causes
considerable disturbance to operation, since the
drawing system is immediately stopped and the wrapped-
round sliver has to be manually removed. In
particular, the incident can often not be immediately
resolved, which leads to delays and thus to production
losses.
In a known apparatus (DE 198 39 885 Al), at least
one separately controllable pneumatic valve for the
pneumatic cylinder is associated with the top output
roller and/or the top output rollers and at least one
adjustable carrier lever or similar for the top output
roller is associated with the pneumatic cylinder. By
pulling in the ram, the carrier lever is drawn up and
with it, the associated top roller bearing. In order
to realise two loading functions of the pressure
cylinder, that is, a push function and a pull function,
a complicated valve device with corresponding valve
control (separately controllable pneumatic valve) is
required.
This invention is based on the problem of further
improving an apparatus of the kind described in the
introduction, which avoids the said disadvantages and

in which in particular the undesirable formation of
windings is avoided or reduced.
The problem is solved by the characterising
features of claim 1.
The bearing pressure of the top rollers on the
fibre slivers is absent and, in particular, the top
roller engages only slightly or not at all with the
fibre material, so that heating of substances in the
fibre material, and thus the adhesive effect, are
avoided. The fibre slivers are thus effectively
prevented from undesirably adhering to the rollers, so
that entrainment upon re-start and hence the formation
of a winding around the rollers does not occur.
Because a resilient element, preferably a mechanical
compression spring, is provided to lift the top roller
bearing, a substantial structural simplification is
achieved. Unlike the known apparatus, a separately
controllable valve control for lifting the top roller
is not present. A particular advantage is the fact
that each time the top roller bearings are relieved of
the pressure exerted by the pneumatic ram, the
resilient element automatically relaxes, and as a
result, the top roller bearings are lifted from the
bottom roller bearings including the top rollers from
the bottom rollers.
Claims 2 to 24 contain advantageous developments
of the invention.
The invention is explained in detail hereinafter
with reference to exemplary embodiments illustrated in
the drawings, in which:
Fig. 1 is a schematic side view of the drawing
system of a draw frame with the apparatus
according to the invention;
Fig. 2 shows part of Fig. 1 in the section
corresponding to K-K (Fig. 1) with a
pneumatic top roller loading device;

Fig. 3 is a front view of a pressing arm with
integral housing and two rams,
Fig. 3a is a perspective view of pressing arm
shown in Fig. 3;
Fig. 4a shows a top roller bearing loaded by a
ram on one side and a bearing stub loaded by
a tensioned spring, top and bottom roller
being located one on top of the other with no
gap between them;
Fig. 4b shows a the top roller bearing relieved
of loading by the ram and the bearing stub
lofted with the relaxed spring, top roller
and bottom roller having a gap between them;
Fig. 4c shows in detail the spring-loaded angle
lever shown in Figs 4a and 4b;
Fig. 5a shows a top roller bearing loaded by a
ram on the other side and a bearing stub
loaded with a tensioned spring, top and
bottom roller (as in Fig 4a) being located
one on top of the other;
Fig. 5b shows the top roller bearing relieved of
loading by the ram and the bearing stub
lifted with the relaxed spring, top roller
and bottom roller (as in Fig. 4b) having a
gap between them;
Fig. 5c shows in detail the spring-loaded angle
lever shown in Figs 5a and 5b;
Fig. 6a shows the drawing system in operation with
the top rollers loaded, and

Fig. 6b shows the drawing system of Fig. 6a when
operation is suspended, with the top rollers
relieved of load and with the top output
roller (deflecting roller) lifted.
With reference to Fig.1, a drawing system S of a
draw frame, for example, the Triitzschler HSR draw frame
is provided. The drawing system S is designed as a 4-
over-3 drawing system, that is, it comprises three
bottom rollers I, II, III (I being the bottom output
roller, II the middle bottom roller, III the bottom
intake roller) and four top rollers 1, 2, 3, 4.
Drafting of the composite sliver 5 from a plurality of
fibre slivers takes place in the drawing system S. The
draft is made up from the preliminary draft and the
main draft, and the roller pairs 4/III and 3/II form
the preliminary drafting zone and the roller pairs 3/II
and 1, 2/1 form the main drafting zone. The bottom
output roller I is driven by the main motor (not shown)
and hence determines the rate of delivery. The bottom
intake and middle bottom rollers III and II
respectively are driven by a variable speed motor (not
shown). The top rollers 1 to 4 are pressed against the
bottom rollers I, II, III by pressing elements 91 to 94
(weighting device) in pressing arms 11a to 11d
pivotable about pivot bearings (see Figs 3 and 4a), and
are hence driven by way of frictional engagement. The
direction of rotation of the rollers I, II, III; 1, 2,
3, 4 is indicated by curved arrows. The composite
fibre sliver 5, which consists of a plurality of fibre
slivers, runs in direction A. The bottom rollers I,
II, III are mounted in bearers 14 (see Fig. 3) which
are arranged on the machine frame 15.
Referring to Fig. 2, an upper supporting element 12 and
a lower holding element 13a are associated with the
pneumatic cylinder 9. The pneumatic cylinder 9 forms a

cylinder unit having a cylinder cavity 17 comprising
two parts 17a and 17b, in which a piston 18 is guided
by means of a ram 19 in a sliding bushing 20. The
roller journal 4a of the pressure roller 4 passes right
through an opening in a holding plate 27a and engages
in a bearing 22a. The bearing 22a receiving the
pressure roller 4 extends into a space between the ram
19 and the roller journal IIIa of the bottom roller
III. The bearing 22a is mounted on the holding element
13a. A diaphragm 16 divides the cylinder cavity 17
into pressure regions. In order to generate pressure
in the upper part 17a of the cylinder cavity 17,
compressed air p1 can be admitted to this space by
means of a compressed air connection 23. Air is
evacuated from the lower part 17b of the cylinder
cavity 17 through a vent bore 24. Analogously, air
can be evacuated from the upper part of the cylinder
cavity 17 and compressed air can be admitted to
the lower part of the cylinder cavity 17. In
operation, after a fibre sliver 5 has been guided over
the bottom rollers I, II, III, the pressing arms 11 are
pivoted into the working position shown in Fig. 4 and
fixed in this position by a fixing device (not shown),
so that the pressure rollers I, II, III are able to
exert pressure. Application of pressure occurs on the
one hand as a consequence of each of the rams 19 being
located on the corresponding bearing 22, and on the
other hand in that an overpressure is generated in the
void above the diaphragm 16. The ram 19 therefore
presses with its other end on the bearing 22, in order
to generate the said clamping between the top roller 4
and the bottom roller (drive roller) III. The ram 19
is displaceable in the direction of the arrows D, E.
Referring to Figs 3, 3a, the top roller 4 has
associated with it a portal-form pressing arm 11a. (A
corresponding pressing arm 11 (not shown) is associated
with the top rollers 2 to 4). The pressing arm 11a is
in the form of a housing 11 of glass fibre-reinforced

plastics and is manufactured by injection moulding.
The housing 30 is an integral component of uniform
construction comprising the supporting element 12, the
two bodies of the pressing elements 9a1 and 9a2
(pressure cylinders), two intermediate elements 31a and
31b, and two holding elements 13a and 13b. The
supporting element 12a is in the form of a channel of
approximately U-shaped cross-section open on one side,
pneumatic lines 34 and electrical leads 35 being
arranged in the interior of the channel. The open side
of the channel 34 is closable by a removable cover 36,
which consists of glass fibre-reinforced plastics
material, has an approximately U-shaped cross-section
and is resilient, such that it is fixed by an
interference fit on the channel 33. The housing 30 is
preferably of one-piece construction. The integral
housing 30, which combines all the essential function
elements for mounting and weighting the respective top
rollers 1 to 4, can thus be manufactured economically.
At the same time, in a simple manner the entire
pressing arm 11a to 11d is rotatable about the centre
of rotation 10 and can be locked and unlocked by a
locking device 26. The rams 19a and 19b are relieved of
pressure and hence lifted a distance b1, b2 from the
bearings 22a to 22b of the top roller 4 (see Figs 4b,
5b) .
Referring to Fig. 4a, on one side of the top
roller 4 the top roller bearing 22a is pneumatically
loaded by the ram 19a. The top roller 4 and the bottom
roller III are located one on top of the other with no
gap between them. An angle lever 36a having two angle
arms 36aI and 36aII projecting at right angles, one at
each end, is mounted on the holding element 13a as
driver element. As Fig. 4c illustrates, the angle arm
36aI engages beneath the bearing stub 25a of the
bearing 22a. The other angle arm 36aII is resiliently
biased by a compression spring 37, which is supported
on the holding element 13a. The line of action 38 of

the compression spring 37 and the line of action 39 of
the ram 19a are parallel with one another. The angle
lever 36a is mounted so that it is displaceable
relative to the holding element 13a in the direction of
the arrows F, G, whereby the position of the angle
lever 36a is adjustable (when the pressing arm 11a is
without pressure).
According to Fig. 5a, on the other side of the top
roller 4, the top roller bearing 22b is pneumatically
loaded by the ram 19b. An angled plate 36b is arranged
as driver element on the holding element 13b; at one
end of the angled plate an angle arm 36bI projects at
right angles. As Fig. 5c shows, the angle arm 36bI
engages beneath the bearing stub 25b of the bearing
22b. The angled plate 36b is resiliently biased by a
compression spring 40, which is supported on the
holding element 13b. The line of action 41 of the
compression spring 40 and the line of action 42 of the
ram 19b are axially parallel with one another. The
angled plate 36b is mounted so that it is displaceable
relative to the holding element 13b in the direction of
the arrows F, G. The reference numeral 43 denotes a
latching and unlatching element for the top roller 4,
pivotally mounted around a pivot bearing 44. A threaded
pin 45 acts on the angled plate 36b, whereby the
position of the angled plate 36b (when the pressing arm
11a is without pressure) is adjustable.
In operation, corresponding to Figs 4a, 5a, the
rams 19a and 19b load the top roller bearings 22a
respectively 22b in direction D. In this way, the
bearing stubs 25a and 25b mounted on the top roller
bearings 22a, 22b respectively are also pressed
downwards in direction M. Via the angle arm 36aI and
via the angle arm 36bI, the angle lever 36a and angled
plate 36b, and the bearing stubs 25a and 25b, are pulled
downwards in direction F - against the force of the
respective compression springs 37 and 40. At the same
time and automatically, the compression springs 37 and

40 are consequently tensioned in direction N.
When operation is suspended, corresponding to Figs
4b, 5b, and the rams 19a and 19b are now relieved of
loading in direction E, a gap b1 respectively b2 is
present between the end of the rams 19a and 19b and the
top roller bearings 22a, 22b respectively. Because the
top roller bearings 22a and 22b have been relieved of
loading, and by virtue of the gaps b1 and b2, the
bearing stubs 25a and 25b are likewise relieved of
loading in direction L. Owing to the relaxation of the
compression springs 37 and 40, the bearing stubs 25a
and 25b are pulled upwards or lifted in direction G by
way of the angle lever 36a and the angled plate 36b, by
means of the angle arm 36aI and the angle arm 36bI
respectively. At the same time and automatically, the
compression springs 37 and 40 consequently relax in
direction 0.
Referring to Fig 6a, in operation the top output
rollers 1 and 2 lie on the bottom output roller I with
applied load, the fibre material 5 running through
between the top output rollers 1 and 2 and the bottom
output roller I. Upon extended stoppage time - which
is detected in the electronics control and regulating
device, not shown, for the drive motors - the top
output roller 1 is relieved of loading and immediately
thereafter, as shown in Fig 6b, lifted by the distance
c away from the fibre material 5 and the bottom output
roller I. This prevents the fibre material 5 from
adhering via foreign bodies and so on, as a result of
pressure, to the top output roller 1. Because the top
output roller 2 is now relieved of loading and hence
remains in place by gravity, the fibre material 5
remains firmly clamped and held between the top output
roller 2 and the bottom output roller I and, upon re-
start, can be guided without problem by the top output
roller 1 and the bottom output roller I.
The invention has been described by the example of
pneumatic pressing elements (loading elements).

Alternatively, mechanical, hydraulic or electrical
pressing elements for loading the top rollers 1 to 4
can be used.
In practice, many loops appear around the
deflecting roller 1, usually caused by lubricating
agents and adhesive particles present on the fibres.
After an operational disturbance in the machine (sliver
rupture, coiler can change or the like), the machine
attendants are often not able to resolve such incidents
immediately. The draw frame relieves the drawing
system of loading after an interruption occurs, but the
hot deflecting roller 1 lies on the fibres 5 under its
own weight. If the deflecting roller 1 lies for an
extended period on the sticky fibres 5, these adhere to
the deflecting roller 1 and upon restart, the sticky
fibres 5 wrap themselves around the deflecting roller
1. The measures according to the invention enable the
deflecting roller 1 to be lifted by means of a
resiliently loaded driver element 36a, 36b. By lifting
the deflecting roller 1, the fibres 5 can no longer
stick to the roller, and the pressure on the lower
roller 1 is reduced, whereby the wrap-round tendency is
considerably reduced. The reduction in the wrap-round
tendency significantly increases the efficiency of the
draw frame when sticky fibres are being processed,
because operational disturbances and their elimination
are reduced or avoided.

WE CLAIM
1. A draw frame for textile fibre slivers having a drawing system comprising:
a first roller assembly and a second roller assembly, said first and second roller
assemblies being arranged one after the other and each comprising a bottom roller
and a top roller having first and second top roller bearings;
characterised in that,
a loading arrangement for applying a load to said top rollers so as to press said top
rollers against said respective bottom rollers, which load can be substantially
relieved by the loading arrangement; and
a lifting arrangement for lifting a said top roller from a said bottom roller when said
load is substantially relieved, wherein the lifting arrangement is actuated
automatically in response to operation of the loading arrangement to relieve the
load.
2. A draw frame according to claim 1, in which the lifting arrangement comprises:
a first resiliently loaded element associated with a first top roller bearing of a said
top roller;
a second resiliently loaded element associated with a second top roller bearing of
that roller;

said first and second resiliently loaded elements being arranged for lifting said first
and second top roller bearings when the load applied by the loading arrangement is
substantially relieved.
3. A draw frame according to claim 2, further comprising first and second resilient
loading elements for loading said first and second resiliency loaded elements.
4. A draw frame according to claim 3, in which at least one of said first and second
resilient loading elements is a spring.
5. A draw frame according to claim 3, in which at least one said resiliency loaded
element is a driver element.
6. A draw frame according to claim 5, wherein the driver element comprises an angle
member having an angle arm that engages beneath one of the first or second top
roller bearings.
7. A draw frame according to claim 3, wherein at least one of said resilient loading
elements is supported on a fixed bearing.

8. A draw frame according to claim 3, wherein the resilient loading elements are
arranged to act along a line of action that is substantially parallel to a line of action
of the loading arrangement.
9. A draw frame according to claim 3, wherein the resilient loading elements are
resiliently deformed during operation of the draw frame.
10. A draw frame according to claim 9, wherein the resilient loading elements are
arranged to relax when the loading arrangement is actuated to relieve the top roller
of loading.
11. A draw frame according to claim 1, wherein the roller assemblies form part of a 4-
over-3 drawing system and the loading and lifting arrangements are arranged to
act on a top roller nearest an output of the draw frame.
12. A draw frame according to claim 1, wherein the loading arrangement and/or the
lifting arrangement are arranged to act on a top roller that is a deflecting roller.

13. A draw frame according to claim 1, wherein the loading arrangement is operable to
relieve load on a roller of a roller assembly having three rollers.
14. A draw frame according to claim 1, wherein a last top roller in a direction of travel
of the fibre slivers is capable of being brought automatically out of contact with the
fibres.
15.A draw frame according to claim 1, wherein upon re-start of the draw frame, a
previously lifted top roller is capable of being returned automatically into
engagement with the respective bottom roller under pressure loading.
16. A draw frame according to claim 5, further comprising at least one adjustment

a lifting arrangement for automatically lifting said roller away from the second roller
with which it is in co-operation during operation of the draw frame, when the load
is relieved.
18. An apparatus on a draw frame for textile fibre slivers, comprising a drawing system
including:
a plurality of pressing arms each having weighted pressing elements;
a plurality of successively arranged pairs of rollers, each pair of rollers, being
associated with a respective pressing arm and comprising;
a bottom roller having bottom roller bearings; and
a top roller having top roller bearings; and
at least one resiliently loaded element associated with the top roller bearings of at
least one pair of rollers, wherein, during operation of the apparatus, the top rollers
are arranged to press against the bottom rollers and the fiber slivers there between
by the weighted pressing elements in the pressing arms, and wherein, upon
interruption of operation of the apparatus, the weighted pressing elements are
arranged to relieve the pressing load on the top rollers so that no or only slight
pressure is exerted on the fibre slivers and the at least one resiliently loaded

element is arranged to lift the respective top roller in a direction away from the
respective bottom roller.
19. A draw frame according to claim 1, wherein the loading arrangement is a
pneumatically operated loading arrangement.
20. A draw frame according to claim 1, wherein the lifting arrangement is a mechanical
lifting arrangement.
21. A draw frame according to claim 17, further comprising a pneumatically operated
loading arrangement.
22. A draw frame according to claim 17, wherein the lifting arrangement is a
mechanical lifting arrangement.


In an apparatus on a draw frame for textile fibre slivers with weighting of the top rollers
of the drawing system of successively arranged pairs of rollers comprising a bottom and
a top roller, in which, during operation, the top rollers are pressed against the bottom
rollers by weighted pressing elements in pressing arms, wherein, when operation is
suspended, the bearings of the top rollers are relieved of the weighting by the pressing
arms, on interruption to continuous operation the top output roller or the top output
rollers is/are capable of being relieved of loading in such a way that no or only slight
pressure is exerted on the fibre slivers.

Documents:

348-KOL-2004-ABSTRACT-1.1.pdf

348-kol-2004-abstract-1.2.pdf

348-kol-2004-abstract.pdf

348-kol-2004-amanded claims-1.1.pdf

348-KOL-2004-AMENDED CLAIMS.pdf

348-KOL-2004-CANCELLED PAGES.pdf

348-kol-2004-claims.pdf

348-KOL-2004-CORRESPONDENCE 1.2.pdf

348-KOL-2004-CORRESPONDENCE-1.1.pdf

348-kol-2004-correspondence-1.3.pdf

348-kol-2004-correspondence.pdf

348-kol-2004-correspondence1.4.pdf

348-KOL-2004-DESCRIPTION (COMPLETE)-1.1.pdf

348-kol-2004-description (complete).pdf

348-kol-2004-drawings-1.1.pdf

348-kol-2004-drawings.pdf

348-kol-2004-examination report.pdf

348-KOL-2004-FORM 1-1.1.pdf

348-kol-2004-form 1.pdf

348-kol-2004-form 18.1.pdf

348-kol-2004-form 18.pdf

348-KOL-2004-FORM 2-1.1.pdf

348-kol-2004-form 2.pdf

348-kol-2004-form 26.pdf

348-KOL-2004-FORM 3-1.1.pdf

348-kol-2004-form 3.2.pdf

348-kol-2004-form 3.pdf

348-KOL-2004-FORM 5-1.1.pdf

348-kol-2004-form 5.2.pdf

348-kol-2004-form 5.pdf

348-kol-2004-granted-abstract.pdf

348-kol-2004-granted-claims.pdf

348-kol-2004-granted-description (complete).pdf

348-kol-2004-granted-drawings.pdf

348-kol-2004-granted-form 1.pdf

348-kol-2004-granted-form 2.pdf

348-kol-2004-granted-specification.pdf

348-kol-2004-others-1.1.pdf

348-KOL-2004-OTHERS.pdf

348-kol-2004-others1.2.pdf

348-KOL-2004-PA.pdf

348-kol-2004-petition under rule 137-1.1.pdf

348-KOL-2004-PETITION UNDER RULE 137.pdf

348-kol-2004-priority document.pdf

348-kol-2004-priority document1.1.pdf

348-KOL-2004-REPLY TO EXAMINATION REPORT.pdf

348-kol-2004-reply to examination report1.1.pdf

348-kol-2004-specification.pdf


Patent Number 248927
Indian Patent Application Number 348/KOL/2004
PG Journal Number 37/2011
Publication Date 16-Sep-2011
Grant Date 12-Sep-2011
Date of Filing 23-Jun-2004
Name of Patentee TRUTZSCHLER GMBH & CO. KG.
Applicant Address DUVENSTRASSE 82-92, D-41199 MONCHENGLADBACH
Inventors:
# Inventor's Name Inventor's Address
1 CHRISTOPH LEINDERS AN HELDSMUHLE 65, D-41352 KORSCHENBROICH
PCT International Classification Number D01H 5/00, C03B37/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 10331759.7 2003-07-14 Germany