U.S. patent application number 09/948006 was filed with the patent office on 2002-07-18 for core for a spinning bobbin and method of producing the core.
Invention is credited to Basse, Hartwig, Bittner, Hans-Joachim, Logemann, Dirk.
Application Number | 20020092284 09/948006 |
Document ID | / |
Family ID | 7656515 |
Filed Date | 2002-07-18 |
United States Patent
Application |
20020092284 |
Kind Code |
A1 |
Basse, Hartwig ; et
al. |
July 18, 2002 |
Core for a spinning bobbin and method of producing the core
Abstract
The invention relates to a core (10) for a spinning bobbin and
for receiving a windable material. The core (10) consists of wound
strip material (11). Adjacently lying portions of the strip
material (11) overlap one another. Production is performed by
winding on a winding mandrel (14).
Inventors: |
Basse, Hartwig; (Nordenham,
DE) ; Bittner, Hans-Joachim; (Brake, DE) ;
Logemann, Dirk; (Butjadingen, DE) |
Correspondence
Address: |
TECHNOPROP COLTON, L.L.C.
P O BOX 567685
ATLANTA
GA
311567685
|
Family ID: |
7656515 |
Appl. No.: |
09/948006 |
Filed: |
September 6, 2001 |
Current U.S.
Class: |
57/129 |
Current CPC
Class: |
B65H 2701/31 20130101;
B31C 3/00 20130101; B65H 75/50 20130101; B65H 75/10 20130101 |
Class at
Publication: |
57/129 |
International
Class: |
D01H 013/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 16, 2000 |
DE |
10045945.5 |
Claims
1. Core (10) for a spinning bobbin and for receiving a windable
material, characterized by a construction from wound strip material
(11).
2. Core according to claim 1, characterized in that adjacently
lying portions of the strip material (11) are permanently joined to
one another.
3. Core according to claim 1, characterized in that adjacently
lying portions of the strip material (11) at least partially
overlap one another.
4. Core according to claim 2, characterized in that edges (22, 23)
of the strip material (11) lying opposite one another form the
portions lying opposite one another.
5. Core according to claim 4, characterized in that the edges (22,
23) of the strip material (11) lying opposite one another are made
thinner than a central region (24) of the same and in that the
thinner edges (22, 23) at least partially overlap one another.
6. Core according to claim 1, characterized in that the strip
material (11) has a flat, rectangular cross section.
7. Core according to claim 1, characterized in that the strip
material (11) is reinforced.
8. Core according to claim 1, characterized in that the strip
material (11) consists of least partially of plastic.
9. Core according to claim 1, characterized in that the strip
material (11) is helically wound.
10. Core according to claim 1, characterized in that the strip
material (11) is annularly wound.
11. Core according to claim 1, characterized in that a number of
rings (34, 35) of strip material (11) are joined to one another,
lying axially adjacent to one another, for the forming of the core
(10).
12. Core according to claim 11, characterized in that neighbouring
rings (34, 35) have peripheral end faces (32, 33) positively
engaging in one another and regions of the end face (32) of one
ring (34, 35) bear against regions of the end face (33) of the
neighbouring ring (34, 35).
13. Core according to claim 12, characterized in that the end faces
(32, 33) are peripherally profiled.
14. Core according to claim 12, characterized in that the end faces
(32, 33) are peripherally stepped.
15. Method of producing a core (10) for a spinning bobbin,
characterized in that the core (10) is produced by the winding
method, a flat strip material (11) being wound and thus forming the
core (10) extending in the direction of a winding axis (17).
16. Method according to claim 15, characterized in that the strip
material (11) is wound onto a winding mandrel (14).
17. Method according to claim 15, characterized in that the strip
material (11) is supplied for winding in a position fixed in
relation to the direction of a winding axis (17) and in that a free
end (20) of the wound core (10) travels in the direction of the
winding axis (17).
18. Method according to claim 17, characterized in that a cutting
device (18) for severing at least portions of a defined length of
the core (10) travels in the direction of the winding axis (17)
during the severing operation.
19. Method according to claim 15, characterized in that portions of
a defined length are severed from a free end of a wound package
(19) produced by the winding for the forming of at least part of
the desired core (10).
20. Method according to claim 18, characterized in that cut faces
produced by the severing of portions from a wound package (19) are
smoothed.
21. Method according to claim 15, characterized in that the strip
material (11) is wound with at least partial overlapping of
neighbouring portions.
22. Method according to claim 21, characterized in that the strip
material (11) is permanently joined in the region of the
overlapping.
23. Method according to claim 15, characterized in that a number of
rings (34, 35) of wound strip material (11) are joined to one
another, lying adjacent to one another in the axial direction, for
the forming of the core (10).
Description
DESCRIPTION
[0001] The invention relates to a core for a spinning bobbin and
for receiving a windable material and relates to a method of
producing the core.
[0002] Yarns, woven fabrics, threads or filaments and the like are
wound onto spinning bobbins during production. The spinning bobbins
have a solid core, around which the material to be wound is wound.
The invention is concerned with the construction and production of
a spinning bobbin core of this type.
[0003] The object of the invention is to provide a spinning bobbin
core which can be produced in a simple way.
[0004] A core according to the invention for a spinning bobbin is
obtained from the features of Patent Claim 1. Flat strip material
in particular, for instance made of plastic, is wound in a suitable
way and thus forms the core. The strip material, for instance a
flat belt, is preferably wound spirally and/or helically.
Construction from a strip material permits production which is
simple and extremely flexible with regard to diameters and
lengths.
[0005] Adjacently lying portions of the strip material--the latter
is also referred to as winding strip--are advantageously
permanently joined to one another, for instance by welding or
adhesive bonding. A spiral arrangement of the strip material and
welding of the same results in extremely high strength, not
inferior to that of a seamless tube.
[0006] Adjacently lying portions of the strip material preferably
overlap one another. This farther increases the strength and
possibility of permanently joining the adjacently lying
portions.
[0007] In one embodiment of the invention, edges of the strip
material lying opposite one another are made thinner than a central
region of the same, the thinner edges of adjacently lying portions
overlapping one another This makes it possible to form the core
with a continuous thickness in spite of regions overlapping one
another. Weight is also saved. A uniform thickness or wall
thickness of the core is obtained in particular if the edges
overlapping one another, taken together, have a thickness
corresponding to the non-overlapping regions, for instance the
central region.
[0008] The strip material preferably has a flat, rectangular cross
section. In particular, the edges are of a stepped form, to permit
overlapping. Edge offsets or steps have a thickness which
corresponds to half the thickness otherwise of the strip material.
Different thicknesses in the region of the edges lying opposite one
another are also conceivable. What is important is that the edges
overlapping one another, taken together, have a thickness
corresponding to the non-overlapping regions.
[0009] The strip material is advantageously reinforced, for
instance by embedded tension-bearing elements, in particular made
of high strength fibres such as aramid or steel for example. The
tension-bearing elements are also arranged in the region of the
edges of the strip material, at least in the region of one of the
edges lying opposite one another, so that when the edges are
overlapped there are reinforcements over the entire length of the
core. This is not obligatory, however.
[0010] According to a further idea of the invention, the strip
material is annularly wound. An endless ring is formed from an
endless portion of the strip material by winding with only one lap.
In this case, ends of the strip material abutting one another are
joined to one another.
[0011] A core with a longer dimension in the axial direction is
formed by permanently joining a number of rings.
[0012] The method according to the invention is obtained from the
features of Patent Claim 15, if appropriate in conjunction with the
subsequent subclaims.
[0013] The strip material is advantageously continuously wound
spirally and/or helically and thus forms the core extending in the
direction of a winding axis.
[0014] The strip material is preferably wound onto a winding
mandrel, for instance onto a motor-driven winding mandrel. The core
produced is hollow and can be pulled off the winding mandrel after
completion.
[0015] The strip material is advantageously supplied stationarily
in a fixed position--in relation to the direction of the winding
axis. In this case, a free end of the wound core continuously
travels in the direction of the winding axis. If a winding mandrel
of finite length is used, the free end "grows" over and beyond a
free end of the winding mandrel.
[0016] According to a development of the method according to the
invention, portions of a defined length are severed from the free
end of the wound core. If the winding rate remains the same, the
length of the wound core is dependent on the time which has
elapsed. In an automatic system, this makes programmed control
possible in a simple way.
[0017] A cutting device provided for severing the portion of a
defined length travels in the direction of the winding axis during
the severing operation or is taken along parallel to it. The
travelling rate is preferably 50 mm/min and in this case
corresponds to the increase in length of the core brought about by
the strip material being supplied and wound. In this way, extremely
exact and straight cuts can be made. Temporary coupling of the
cutting device to the core is also possible, for instance by
gripping elements which are released after a finished core has been
cut off and, following a pushing-back movement, once again securely
hold the newly growing core and travel along with it.
[0018] Preferred exemplary embodiments of the invention are
explained in more detail below with reference to the drawing, in
which:
[0019] FIG. 1 shows a wound core in side view,
[0020] FIG. 2 shows the core according to FIG. 1 in cross
section,
[0021] FIG. 3 shows a core during production in side view,
[0022] FIG. 4 shows a cross section through a winding strip with
tension-bearing elements used for the production of the core,
[0023] FIG. 5 shows a core comprising a single ring, the ends of
which have not yet been joined to one another,
[0024] FIG. 6 shows a pulled-apart representation of two rings on a
mandrel for the forming of a core, and
[0025] FIG. 7 shows a pulled-apart representation of two rings for
the forming of a core.
[0026] FIG. 1 shows a core 10 for a spinning bobbin and for
receiving a windable material, for instance a fibre or a woven
fabric. A construction comprising a helically wound material can be
easily seen. This is referred to in the present case as strip
material 11.
[0027] The core 10 is of a hollow form similar to a tube, see FIG.
2. The inside diameter is, for example, 300 mm; the length of the
core is, for example, 350 to 400 mm.
[0028] The strip material similar to a flat belt consists of
thermoplastic material and is preferably produced by extrusion or
in some other continuous process and may be reinforced. FIG. 4
shows tension-bearing elements 12 which are embedded in the strip
material 11, extend in the direction of the strip material and
preferably run parallel adjacent to one another at equal intervals.
Wires, high-strength fibres and the like come into consideration as
tension-bearing elements.
[0029] A device for producing a spinning bobbin core according to
the invention is sketched in FIG. 3. The strip material 11 is
supplied by means of a stationary or fixed guiding unit 13 to a
winding mandrel 14 and comes to bear against the latter. The
winding mandrel 14 is mounted on a shaft 15, which is supported by
suitable bearings 16 for absorbing transverse forces and is driven
in a way not shown. The guiding unit 13 is located directly ahead
of the point where the strip material 11 runs onto the winding
mandrel 14.
[0030] The guiding unit 13 has the effect that the strip material
11 is supplied to the winding mandrel 14 not exactly transversely
with respect to the winding axis 17 but at a small angle. The angle
is dependent on the width of the strip material 11 and is chosen
precisely such that portions of the strip material 11 directly
neighbouring one another come to lie adjacent to one another
without intermediate spaces as a result of the winding operation on
the winding mandrel 14. In this case, the strip material is wound
around the winding mandrel 14 helically or spirally in the manner
of a screw thread.
[0031] The wound package 19 produced in this way is continuously
advanced by the supplied strip material 11 and may be of virtually
any desired length. A core 10 with the desired length is
expediently severed from the wound package 19 by an adjustable
cutting device 18. The said wound package slides on the winding
mandrel 14, so that a free end 20 travels in the direction of the
winding axis 17.
[0032] The winding mandrel 14 may be provided with forward-driving
devices (not shown), for example caterpillar take-offs, arranged in
the direction of the winding axis 17, in order to permit the
described travelling movement of the wound package 19 on the
winding mandrel 14.
[0033] The winding mandrel 14 extends not quite up to the working
area of the cutting device 18 and has a constant cross section over
its length. In an embodiment not shown, the cross section of the
winding mandrel 14 narrows in the direction of the cutting device
18. This prevents the wound package 19 from seizing on the winding
mandrel 14 if the strip material 11 shrinks. The winding mandrel 14
is preferably then formed in a slightly conical way.
[0034] The cutting device 18 is taken along with the travelling
free end 20 during the cutting operation, in order to permit cuts
precisely transversely with respect to the winding axis 17.
[0035] After the cutting, the free end 20 or the peripheral cut
face of the wound package 19 and/or the corresponding cut face of
the severed core 10 are subjected to post-treatment. The aim is to
seal and/or smooth the cut faces, in particular any reinforcements
or tension-bearing elements 12 present. For this purpose, the cut
faces are exposed to heat. Welding can preferably be performed as
hot-plate welding, with hot air or as ultrasonic welding.
[0036] The strip material 11 coming to lie on the winding mandrel
14, or the laps thereof neighbouring one another, are permanently
joined to one another. For this purpose, in FIG. 3 a welding unit
21 is arranged approximately opposite the guiding unit 13. Lateral
edges 22, 23 of the strip material 11 are welded directly to one
another or permanently joined to one another in some other way.
This increases the strength of the core 10 produced. Releasable
joining is advantageous if the strip material 11 is to be reused,
for instance for cores of different diameters and/or lengths.
[0037] It is preferred for the surface of the core 10 to be of a
planar form in the direction of the winding axis 17. Nevertheless,
the portions of the strip material 11 neighbouring one another are
to be joined well to one another. For this purpose, the cross
section of the strip material 11 (FIG. 4) is formed in a special
way. The edges 22, 23 are each made thinner than the strip material
11 in a central region 24, preferably in each case half as thick.
This allows the lateral edges 22, 23 to overlap one another and
nevertheless form a planar surface of the core 10.
[0038] According to FIG. 4, the strip material 11 has a flat,
rectangular cross section with edge offsets 25, 26. These come to
lie on one another in the wound core 10. The welding or joining by
the welding unit 21 takes place on the lateral edge 23 receiving
the following strip material 11, to be precise in a region in which
the reduced thickness of the lateral edge 23 begins, in FIG. 4 on a
step end face 27 facing the offset 26. An outer end face 28 angled
away from the offset 25 comes to lie against the said end face
27.
[0039] Instead of the stepped configuration shown in FIG. 4, the
strip material 11 may also have a cross section tapering to a point
on each side. What is important is the suitability for a surface of
the finished core 10 that is as planar as possible, with preferably
partial overlapping of the strip material 11.
[0040] The already described reinforcement by the tension-bearing
elements 12 is preferably not arranged over the entire cross
section of the strip material 11. Rather, the tension-bearing
elements 12 are present only in the central region 24 and in one of
the two lateral edges 22, 23. In FIG. 4, no tension-bearing
elements are arranged in the lateral edge 23. As a result, this
leads to the finished core 10 having tension-bearing elements at
equal intervals from one another over its entire length. To elevate
the joins between the neighbouring laps of the strip material 11,
however, both lateral edges 22, 23 may also be provided with
tension-bearing elements 12. It is likewise possible for the
lateral edges 22, 23 to be recessed to accommodate the
tension-bearing elements 12. This may be appropriate in particular
in the case of relatively thick tension-bearing elements in
relation to the thickness of the lateral edges.
[0041] The strip material preferably has a width of 120 mm. Instead
of a single flat belt, it may also be divided, so that a number of
part-belts, for instance 3 part-belts, running adjacent to one
another and each with a width of 40 nm, are used for the production
of the core 10. Then, the part-belts coming to lie adjacent to one
another also have to be welded to one another on the winding
mandrel 14. Production with part-belts prevents possible twisting
and bulging of an undivided, relatively wide belt.
[0042] FIG. 5 shows a strip material curved or wound into a ring
29. Free ends 30, 31 still have to be joined to one another,
preferably by welding or adhesive bonding. In the simplest case,
the ring 29 forms the core 10. Its extent in the axial direction is
then dependent on the width of the strip material 11 used, here
preferably up to approximately 120 mm.
[0043] For forming longer cores, a number of rings 29 are arranged
adjacent to one another in the axial direction and are joined to
one another in the region of peripheral end faces 32, 33. This also
preferably takes place by welding or adhesive bonding. Particularly
suitable welding methods are hot-plate welding and ultrasonic
welding.
[0044] For the joining of two rings 34, 35, they are preferably
pulled onto a mandrel 36, which may be motor-driven--by analogy
with the representation in FIG. 3. A vertical alignment of the
mandrel 36 is advantageous. The lower ring 35 then comes to lie on
a peripheral shoulder 37 of the mandrel.
[0045] For joining the rings 34, 35, a self-centring of the same is
advantageous. This is achieved by corresponding formation of the
peripheral end faces 32, 33. According to FIG. 6, the end faces are
bevelled in relation to a centre axis 38. As soon as the rings 34,
35 bear against one another, they are centred in relation to one
another.
[0046] FIG. 7 shows a modification in the formation of the
peripheral end faces 32, 33--approximately analogous to FIG. 4. The
end faces are of a stepped form. The "receiving" end face 32 has an
inner peripheral shoulder 39 with a neighbouring inner face 40.
Opposite this, the "entering" end face 33 is provided with an outer
peripheral shoulder 41 and an outer face 42 offset inwards with
respect to the said shoulder. With this formation, the rings 34, 35
can be inserted one into the other and subsequently permanently
joined to one another. Specifically in the case of this
configuration, there is no need for a mandrel as a centring
aid.
* * * * *