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EP 0 562 757 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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09.08.1995 Bulletin 1995/32 |
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Date of filing: 17.03.1993 |
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International Patent Classification (IPC)6: B65H 75/18 |
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Yarn spinning tube
Fadenspinnhülse
Tuyau de canette à fil
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Designated Contracting States: |
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DE FR GB IT |
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Priority: |
20.03.1992 GB 9206040
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Date of publication of application: |
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29.09.1993 Bulletin 1993/39 |
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Proprietor: GLOSSOP THERMOPLASTICS Ltd |
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Glossop,
Derbyshire,
SK13 9LQ (GB) |
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Inventor: |
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- Adderley, Edward
Warrington,
Cheshire WA1 4QT (GB)
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Representative: Goddard, David John et al |
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HARRISON GODDARD FOOTE
Vine House
22 Hollins Lane
Marple Bridge Stockport SK6 5BB Stockport SK6 5BB (GB) |
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References cited: :
FR-A- 2 190 109
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US-A- 3 464 450
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention relates to yarn spinning tubes (also commonly known as carrier
tubes) according to the first part of claim 1.
[0002] In the manufacture of yarns, it has been common to wind the yarn onto spinning tubes
in the form of plain cardboard tubes. Depending upon the quantity of yarn wound onto
the spool, the wall section thickness of the tube has been varied. Typically, such
spinning tubes may have a section thickness of from 3mm to 11mm to give the desired
degree of strength and stiffness. The yarn wound onto the spinning tube for storage
on manufacture, is later "off-wound" for the purpose of, for example, the manufacture
of fabric from the yarn.
[0003] When the yarn is off-wound from the spinning tube, a problem frequently arises due
to damage to the tube end, such damage often resulting in snagging of the yarn and
consequent breakage. It is clearly inconvenient and costly to keep reinstating broken
threads, and imperfections are also produced in the fabric.
[0004] In cardboard spinning tubes having the thinnest wall sections of about 3mm, it is
possible to mould a rounded nose by folding the tube material into the bore to produce
a spool which is more resistant to damage the consequently less prone to snagging
of the yarn. However, in so doing, it becomes more difficult to maintain a truly concentric
bore, which may give problems with regard to balance of the spinning tube when winding
on the yarn. Furthermore, it is impossible to provide the thicker cardboard wall sections
with such a rounded, snag-resistant nose by folding or moulding.
[0005] Known cardboard spinning tubes are also considered to be "single-trip" items in that
they are discarded after the yarn has been off-wound.
[0006] FR-A-2190109 describes a plastics material spinning tube manufactured by an extrusion
technique.
[0007] It is an object of the present invention to provide a yarn spinning tube which is
economic to manufacture, and has an improved performance with regard to the problem
of snagging than the known cardboard spinning tubes.
[0008] It is a further objective to provide a spinning tube which is more durable than known
tubes and which may be reused a number of times before being discarded.
[0009] According to the present invention there is provided a yarn spinning tube, the spinning
tube comprising a first outer member of generally tubular form made of a plastics
material, a second inner member of generally tubular form made of a plastics material,
the two members being substantially concentric and being radially separated by spacer
means, wherein the first outer and second inner members are separate interfitted members.
[0010] The spinning tube of the present invention may advantageously be made from thermoplastic
plastics material. Typical examples of plastics materials which may be used in spinning
tubes of the present invention may include polypropylene, styrenes, polyesters and
many others.
[0011] Some man-made yarns require processing by, for example, heat treatment to develop
the optimum physical properties of the yarn material. Plastics material spinning tubes
of the present invention are more able to withstand such manufacturing process treatments
than conventional cardboard spinning tubes, and furthermore, are able to be reused
a number of times. This is also true where the yarn requires dyeing after manufacture;
when wound on conventional cardboard spinning tubes, the yarn frequently needs to
be off-wound onto other plastics material carriers prior to dyeing as the cardboard
cannot withstand the conditions during the dyeing process. Plastics material spinning
tubes of the present invention are able to withstand the conditions during a dyeing
process.
[0012] A further advantage of using plastics material is that spinning tubes may be easily
colour-coded to automatically enable yarns wound thereon to be identified. Dye colorants
in the plastics material enable such colour-coding to be carried out during moulding.
[0013] Spinning tubes of the present invention may preferably be made by the technique of
plastics injection moulding. It has been found that when manufactured by injection
moulding, the necessary accuracy may be easily maintained. Yarns may typically be
wound onto the spinning tube at speeds up to 6000 m/min giving rise to high rotational
speeds of over 1600 rev/min of the spinning tube. Upwards of 4kg of yarn may be wound
onto the spinning tube leading to high out-of-balance forces with consequent vibration
and possible damage to the winding machine bearings if high dimensional accuracy is
not maintained during moulding.
[0014] The spinning tube of the present invention may comprise an outer, generally tubular
member having spacer means formed in the bore thereof, and a separately formed inner,
generally tubular member which is fitted into the bore of the outer member.
[0015] In a first alternative embodiment the inner, generally tubular member may have spacer
means formed on the outer diameter thereof, and be fitted into the substantially plain
bore of a generally tubular outer member.
[0016] In a second alternative embodiment, both the bore of the outer member and the outer
diameter of the inner member may both be provided with spacer means.
[0017] For reasons of cost, ease and accuracy of manufacture of plastics injection moulding
dies, it is preferred to have the spacer means formed integrally with the bore of
the outer, generally tubular member.
[0018] The two component parts may, for example, be assembled by fitting the solidified,
but still warm outer member over the inner member and allowing the assembly to fully
cool, thereby effecting a strong interference fit due the shrinkage of the outer member
about the inner member.
[0019] Different plastics materials may be used for the inner and outer members if desired.
[0020] The spacer means may comprise generally axially extending ribs which may be moulded
integrally with either the bore of the outer member or with the outer diameter of
the inner member or both.
[0021] The ribs may be truly axially extending, in that they are substantially parallel
to the spinning tube axis, or may extend helically in the axial direction of the spinning
tube in the manner of "rifling" in a gun barrel.
[0022] It has been found that dimensional accuracy of better than 0.25mm on radial crushing,
and better than 0.5mm axial distortion may be obtained with a spinning tube fully
wound with over 4kg of elastomeric yarn, the tube having nominal dimensions of 83mm
overall diameter and 290mm overall length, an outer member wall thickness of 2.5mm,
an inner member wall thickness of 2.5mm and sixteen axially extending ribs of 2mm
radial height.
[0023] In use, yarn spinning tubes are generally either driven from the bore by, for example,
engaging tapered cones mounted on a driven spindle, or may be driven from the outer
surface thereof by, for example, a driven friction wheel or roller. In the former
case, it may be beneficial to provide either the outer surface of the inner member,
or the inner surface of the outer member with means to provide positive mechanical
driving engagement between the inner and outer members. Such means may comprise grooves
or axially directed, upstanding engagement means, such as rails for example, which
cooperate with the spacer means or ribs to give positive engagement for driving purposes
between the outer and inner members.
[0024] Preferably, one end of the outer member may be provided with a smooth rounded shape
to facilitate the yarn being off-wound without snagging. This is a significant advantage
of the spinning tube of the present invention in being able to provide such a surface
as an integral part of the manufacturing process and which is very difficult to economically
provide on known cardboard spinning tubes of thicker wall sections.
[0025] It has been found that plastics material spinning tubes of the present invention
may be manufactured more economically than conventional cardboard spinning tubes,
and moreover as stated above, may be reused.
[0026] In order that the present invention may be more fully understood, examples will now
be described by way of illustration only with reference to the accompanying drawings,
of which:
Figure 1 shows a radial cross-section through a first embodiment of a spinning tube
according to the present invention;
Figure 2 shows an axial section through the plane denoted by the line 2-2 of Fig.
1;
Figure 3 shows an enlargement of part of a radial cross-section through a second embodiment;
Figure 4 shows a similar view to Fig. 3 of a third embodiment; and
Figure 5 which shows a similar view to Fig. 3 of a fourth embodiment.
[0027] Referring now to Figures 1 and 2 of the drawings, and where the same or similar features
are denoted by common reference numerals. A yarn spinning tube is shown generally
at 10. The spinning tube comprises two constituent mouldings; an outer, generally
tubular member 12 and an inner; generally tubular member 14. Both the outer member
12 and inner member 14 are separately produced by a plastics injection moulding technique
from thermoplastic material. The outer member 12 has radially inwardly directed spacer
means 16, in this case in the form of axially continuous ribs of generally rectangular
section, moulded integrally therewith on the bore surface 18 and extending along substantially
the whole axial length. Also moulded integrally with the outer member 12 and the ends
20 of the ribs 16 is a rounded nose-piece and flange 22 to facilitate snag-free off-winding
of the yarn (not shown). The inner member 14 is essentially a plain cylinder fitted
inside the outer member. The two constituent parts are fitted together by fitting
the outer member 12 over the inner member 14 whilst the former is still warm from
the moulding process. In a typical thermoplastic material such as polypropylene, an
interference fit of approximately 0.2mm may easily be achieved by this method.
[0028] In the embodiment shown in Figures 1 and 2 there are sixteen radially directed and
symmetrically disposed ribs, but this number may be varied depending upon the strength
and stiffness characteristics required. The most important proviso is that the ribs
should be either symmetrically or evenly disposed around the bore periphery in the
interests of balance where the spinning tube is intended to rotate at high speed.
[0029] Figure 3 shows a second embodiment wherein ribs 30 are provided on the outer diameter
32 of the inner member 14 in addition to the ribs 16 on the bore 18 of the outer member
12.
[0030] Figure 4 shows a third embodiment of a spinning tube wherein the inner member 14
is provided with grooves 40 in the outer diameter 42 thereof, the grooves 40 cooperating
with the radially inner ends of the ribs 16 of the outer member 12. The purpose of
this embodiment is to provide, in addition to the existing interference fit, a positive
mechanical engagement between the outer and inner members where, for example, a rotational
driving force may be imparted to the outer member through the inner member.
[0031] An embodiment for a similar purpose to that of Figure 4 is shown in a fourth embodiment
in Figure 5, wherein the grooves 40 are replaced by upstanding rails 50 which are
moulded integrally with the outer surface 52 of the inner member 14.
[0032] The constructions of the embodiments shown in Figures 4 and 5 may be reversed with
the grooves 40 or rails 50 being formed on the bore 18 of the outer member 12 and
the corresponding ribs 16 on the outer diameter of the inner member 14. Furthermore
where such grooves or rails are provided, it may be permissible to employ a lower
degree of interference fit between the outer and inner members on assembly.
[0033] Although the ribs 16 and 30 have been shown in the above Figures as being of rectangular
cross-section, it will be apparent to those skilled in the art that other cross-sectional
shapes may be employed. For example, ribs of frusto-conical cross-sectional shape
may be employed in some circumstances.
[0034] All the ribs in the above examples have been shown as being axially directed in that
they are parallel with the spinning tube axis. However, ribs having a helical form
(not shown) may also be employed and describing, for example, a one quarter or a one
half revolution of the tube diameter along the axial length thereof.
1. A spinning tube (10), the spinning tube comprising a first outer member (12) of generally
tubular form made of a plastics material, a second inner member (14) of generally
tubular form made of a plastics material, the two members (12, 14) being substantially
concentric and being radially separated by spacer means (16) characterised in that
the first outer (12) and second inner (14) members are separate interfitted members.
2. A spinning tube according to claim 1 characterised in that the spacer means are ribs
(16) formed integrally with the bore (18) of the outer member (12).
3. A spinning tube according to claim 1 characterised in that the spacer means are ribs
(30) formed integrally with the outer surface (32) of the inner member.
4. A spinning tube according to claim 1 characterised in that the spacer means are ribs
formed integrally on both the bore (18) of the outer member (12) and on the outer
peripheral surface (32) of the inner member (14).
5. A spinning tube according to any one preceding claim characterised in that the spacer
means are parallel to the spinning tube axis.
6. A spinning tube according to any one preceding claim from 1 to 4 characterised in
that the spacer means are disposed helically with regard to the spinning tube axis.
7. A spinning tube according to any one preceding claim from 2 to 6 characterised in
that the surface of the tubular member adjacent the free end of the spacer means is
provided with rib engagement means.
8. A spinning tube according to claim 7 characterised in that the spacer means engagement
means comprises grooves (40) in the surface.
9. A spinning tube according to claim 7 characterised in that the spacer means engagement
means comprises upstanding rails (50) on the surface.
10. A spinning tube according to any one preceding claim characterised in that one axial
end of the outer member is provided with a smooth, rounded profile shape (22).
11. A spinning tube according to claim 10 characterised in that the one axial end of the
outer member also includes a flange portion (22).
12. A spinning tube according to any one preceding claim characterised in that the spacer
means are either symmetrically or evenly disposed around the spinning tube.
13. A spinning tube according to any one preceding claim from 4 to 12 wherein there are
sixteen symmetrically disposed spacer means.
1. Fadenspinnhülse (10) mit einem ersten äußeren, allgemein rohrförmigen Teil (12) aus
Kunststoff und einem zweiten inneren, allgemein rohrförmigen Teil (14) aus Kunststoff,
wobei die zwei Teile (12, 14) im wesentlichen konzentrisch zueinander verlaufen und
durch Abstandshalter (16) radial voneinander auf Abstand gehalten sind, dadurch gekennzeichnet, daß das erste äußere (12) und das zweite innere (14) Teil getrennte, ineinandergesteckte
Teile sind.
2. Fadenspinnhülse nach Anspruch 1, dadurch gekennzeichnet, daß die Abstandshalter Rippen
(16) sind, die einstückig an der Bohrungswandung (18) des äußeren Teils (12) ausgebildet
sind.
3. Fadenspinnhülse nach Anspruch 1, dadurch gekennzeichnet, daß die Abstandshalter Rippen
(30) sind, die einstückig an der Außenfläche (32) des inneren Teils ausgebildet sind.
4. Fadenspinnhülse nach Anspruch 1, dadurch gekennzeichnet, daß die Abstandshalter Rippen
sind, die sowohl an der Bohrungswandung (18) des äußeren Teils (12) als auch an der
Außenumfangsfläche (32) des inneren Teils (14) einstückig ausgebildet sind.
5. Fadenspinnhülse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß
die Abstandshalter parallel zur Achse der Fadenspinnhülse verlaufen.
6. Fadenspinnhülse nach einem der vorhergehenden Ansprüche 1 bis 4, dadurch gekennzeichnet,
daß die Abstandshalter spiralförmig zur Achse der Fadenspinnhülse angeordnet sind.
7. Fadenspinnhülse nach einem der vorhergehenden Ansprüche 2 bis 6, dadurch gekennzeichnet,
daß die dem freien Ende der Abstandshalter benachbarte Oberfläche des rohrförmigen
Teils mit Mitteln für den Eingriff der Rippen versehen ist.
8. Fadenspinnhülse nach Anspruch 7, dadurch gekennzeichnet, daß die Mittel für den Eingriff
mit den Abstandshaltern aus in der Oberfläche vorgesehenen Nuten (40) bestehen.
9. Fadenspinnhülse nach Anspruch 7, dadurch gekennzeichnet, daß die Mittel für den Eingriff
mit den Abstandshaltern aus auf der Oberfläche vorgesehenen aufrechtstehenden Stegen
(50) bestehen.
10. Fadenspinnhülse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß
ein axiales Ende des äußeren Teils mit einer glatten, abgerundeten Profilform (22)
versehen ist.
11. Fadenspinnhülse nach Anspruch 10, dadurch gekennzeichnet, daß das eine axiale Ende
des äußeren Teils auch einen Flanschabschnitt (22) aufweist.
12. Fadenspinnhülse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß
die Abstandshalter entweder symmetrisch oder gleichmäßig um die Fadenspinnhülse herum
verteilt sind.
13. Fadenspinnhülse nach einem der vorhergehenden Ansprüche 4 bis 12, bei der sechzehn
symmetrisch angeordnete Abstandshalter vorhanden sind.
1. Tuyau de canette (10) comprenant un premier élément extérieur (12) de forme générale
tubulaire et fait en matériau plastique, un second élément intérieur (14) de forme
générale tubulaire et fait en matière plastique, les deux éléments (12, 14) étant
sensiblement concentriques et étant séparés radialement par des moyens d'espacement
(16), caractérisé en ce que le premier élément extérieur (12) et le second élément
intérieur (14) sont des éléments distincts et assemblés par ajustement réciproque.
2. Tuyau de canette selon la revendication 1, caractérisé en ce que les moyens d'espacement
sont des nervures (16) formées intégralement ou venues de matière avec le trou (18)
de l'élément extérieur (12).
3. Tuyau de canette selon la revendication 1, caractérisé en ce que les moyens d'espacement
sont des nervures (30) formées intégralement ou venues de matière avec la surface
extérieure (32) de l'élément intérieur.
4. Tuyau de canette selon la revendication 1, caractérisé en ce que les moyens d'espacement
sont des rainures formées intégralement ou venues de matière sur, à la fois, le trou
(18) de l'élément extérieur (12) et sur la surface périphérique (32) de l'élément
intérieur (14).
5. Tuyau de canette selon l'une des revendications précédentes, caractérisé en ce que
les moyens d'espacement sont parallèles à l'axe du tuyau de canette.
6. Tuyau de canette selon l'une des revendications 1 à 4, caractérisé en ce que les moyens
d'espacement sont disposés en hélice par rapport à l'axe du tuyau de canette.
7. Tuyau de canette, selon l'une des revendications précédentes 2 à 6, caractérisé en
ce que la surface de l'élément tubulaire adjacent à l'extrémité libre des moyens d'espacement
est pourvue de moyens aptes à venir en prise avec les nervures.
8. Tuyau de canette selon la revendication 7, caractérisé en ce que les moyens de prise
avec les moyens d'espacement comportent des rainures (14) prévues sur la surface.
9. Tuyau de canette selon la revendication 7, caractérisé en ce que les moyens aptes
à venir en prise avec les moyens d'espacement comportent des rails (50) faisant saillie
et disposés sur la surface.
10. Tuyau de canette selon l'une des revendications précédentes, caractérisé en ce que
l'une des extrémités axiales de l'élément extérieur est pourvue d'une forme présentant
un profil arrondi régulier.
11. Tuyau de canette selon la revendication 10, caractérisé en ce que l'une des extrémités
axiales de l'élément extérieur comporte également une portion formant collerette (22).
12. Tuyau de canette selon l'une des revendications précédentes, caractérisé en ce que
les moyens d'espacement sont disposés soit symétriquement, soit régulièrement, autour
du tuyau de canette.
13. Tuyau de canette selon l'une des revendications 4 à 12, caractérisé en ce qu'il est
prévu seize moyens d'espacement disposés symétriquement.
