U.S. patent application number 09/791197 was filed with the patent office on 2001-08-30 for method and apparatus for winding cross-wound bobbins driven in a rotary manner.
Invention is credited to Lassmann, Manfred.
Application Number | 20010017333 09/791197 |
Document ID | / |
Family ID | 26004530 |
Filed Date | 2001-08-30 |
United States Patent
Application |
20010017333 |
Kind Code |
A1 |
Lassmann, Manfred |
August 30, 2001 |
Method and apparatus for winding cross-wound bobbins driven in a
rotary manner
Abstract
A traversing yarn guide (5) that is moved back and forth
produces cross winding of yarn on a bobbin at each winding head of
a textile spinning or winding machine in order to wind cross-wound
bobbins. After a yarn interruption, an auxiliary yarn guide (4) in
an active position keeps the yarn in a position that is raised out
of the traversing yarn guide (5). In a rest position (4'), the
auxiliary yarn guide (4) does not influence the yarn and the
traversing yarn guide (5) can grasp and take the yarn to be wound
from the auxiliary yarn guide (4). In order to assure a reliable
insertion of the yarn (3) into the traversing yarn guide (5) and to
assure its correct grasping of the yarn (3), the yarn (3) assumes
an initial position within the traversing range after the yarn
interruption, which position is set by the auxiliary yarn guide (4)
in the active position, before the yarn (3) is lowered into the
stationary traversing yarn guide (5) by a position change of the
auxiliary yarn guide (4) into the rest position (4').
Inventors: |
Lassmann, Manfred;
(Nettetal, DE) |
Correspondence
Address: |
KENNEDY COVINGTON LOBDELL & HICKMAN, LLP
100 N TRYON STREET
BANK OF AMERICA CORPORATE CENTER
CHARLOTTE
NC
282024006
|
Family ID: |
26004530 |
Appl. No.: |
09/791197 |
Filed: |
February 23, 2001 |
Current U.S.
Class: |
242/475.7 ;
242/157R; 242/482.8 |
Current CPC
Class: |
B65H 57/006 20130101;
B65H 57/28 20130101; B65H 57/003 20130101; B65H 2701/31
20130101 |
Class at
Publication: |
242/475.7 ;
242/482.8; 242/157.00R |
International
Class: |
B65H 054/28; B65H
054/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 25, 2000 |
DE |
100 09 085.0 |
Oct 20, 2000 |
DE |
100 51 997.0 |
Claims
1. In a method for winding rotationally driven cross-wound bobbins
in a textile machine comprising a plurality of winding heads each
having a traversing yarn guide movable back and forth relative to a
bobbin for cross winding of a yarn onto the bobbin and an auxiliary
yarn guide movable between an active position for holding the yarn
in a raised position out of the traversing yarn guide and an
inactive resting position wherein the yarn is positioned to be
taken by the traversing yarn guide to be wound onto the bobbin, the
improvement comprising the steps of stopping the back and forth
movement of the traversing yarn guide after a yarn interruption,
reconnecting the interrupted yarn, guiding the reconnected yarn by
the auxiliary yarn guide into an initial position relative to the
traversing path of the traversing yarn guide wherein the auxiliary
yarn guide is in the active position, and then lowering the yarn
into the traversing yarn guide by moving the auxiliary yarn guide
from the active position into the inactive resting position before
the traversing yarn guide is restarted.
2. The method according to claim 1, further comprising stopping the
rotational driving of the bobbin after the yarn interruption and
restarting the rotational driving of the bobbin after the
reconnecting of the yarn and before the lowering of the yarn into
the traversing yarn guide by the auxiliary yarn guide.
3. The method according to claim 2, further comprising delaying the
lowering of the yarn into the traversing yarn guide by the
auxiliary yarn guide a predetermined time after the restarting of
the rotational driving of the bobbin.
4. The method according to claim 2, further comprising delaying the
lowering of the yarn into the traversing yarn guide by the
auxiliary yarn guide until a friction roller driving the bobbin has
executed a predetermined number of revolutions after the restarting
of the rotational driving of the bobbin.
5. In a textile machine for winding rotationally driven cross-wound
bobbins comprising a plurality of winding heads each having a
traversing yarn guide movable back and forth relative to a bobbin
for cross winding of a yarn onto the bobbin and an auxiliary yarn
guide movable between an active position for holding the yarn in a
raised position out of the traversing yarn guide and an inactive
resting position wherein the yarn is positioned to be taken by the
traversing yarn guide to be wound onto the bobbin, the improvement
comprising a control device associated with each winding head for
stopping the back and forth movement of the traversing yarn guide
after a yarn interruption, for actuating a reconnecting of the
interrupted yarn, and for actuating the auxiliary yarn guide
initially into the active position for guiding the reconnected yarn
into an initial position relative to the traversing path of the
traversing yarn guide and then moving the auxiliary yarn guide from
the active position into the inactive resting position before the
traversing yarn guide is restarted for lowering the yarn into the
traversing yarn guide.
6. The device according to claim 5, further comprising a separate
drive for the traversing yarn guide and wherein the auxiliary yarn
guide has a yarn guide edge shaped for moving the yarn, during
movement of the auxiliary yarn guide from the active position into
the rest position, into a position of the yarn to be inserted into
the traversing yarn guide when in stopped position.
7. The device according to claim 5, wherein the yarn guide edge of
the auxiliary yarn guide extends over a traversing range of the
traversing yarn guide, has a contour sloping downwardly from
opposite ends of the yarn guide edge toward a middle of the yarn
guide edge, and is pivotable under the control of the control
device between the active position and the rest position.
8. The device according to claim 5, wherein the auxiliary yarn
guide is pivotable into the rest position in the direction of the
traversing yarn guide.
9. The device according to claim 5, wherein the auxiliary yarn
guide is permanently attached to a shaft and is pivotable by a
pneumatic cylinder attached to the shaft via a pivot lever.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application claims the benefit of German patent
applications 10009085.0 filed Feb. 25, 2000, and 10051997.0 filed
Oct. 20, 2000, herein incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to a method and apparatus for
the cross-winding of a yarn onto a rotationally driven tube to form
a yarn bobbin.
[0003] German Patent Publications DE-GM 74 37 800 [utility model]
and DE 23 28 828 C2 disclose the formation of a yarn reserve on
winding bobbins with the aid of a traversing auxiliary yarn guide.
The auxiliary yarn guide is pivotable to lift the yarn during an
upward pivoting motion out of the yarn guide executing a traversing
motion in order to form the desired reserve windings or waste
windings on the bobbin tube outside of the traversing range of the
yarn guide. A reverse pivoting of the auxiliary yarn guide brings
the yarn back into the grasping range of the yarn guide where the
yarn is grasped again by the yarn guide upon its traversing motion
and is wound further into a cross-wound bobbin.
[0004] Such devices are suitable only in a very limited manner or
not at all suitable for the problem of transferring the yarn to the
yarn guide of the winding head after a yarn interruption and after
a subsequent reestablishing of the yarn connection at the work
station of a textile machine. In such case, the transfer of the
yarn does not take place in coordination with the motion of the
yarn guide and, thus, the yarn can be held for a while at one and
the same location of the bobbin and can be deposited in a fairly
great number of superimposed windings. The superimposed localized
yarn windings that result thereby can cause problems during the
unwinding of the yarn from the cross-wound bobbins.
[0005] German Patent Publication DE 39 30 136 A1 teaches
coordinating the motion of the yarn to be transferred and the
traversing motion of the yarn guide with one another in such a
manner that the transfer of the yarn and the yarn guide arrive
essentially simultaneously at the transfer point to the yarn guide
and execute the yarn transfer while the yarn guide is in the
traversing motion. Although considerable expense is necessary for
the construction and regulating technology needed for this
transfer, an exact coincidence in time of the arrival of the yarn
and of the yarn guide at the transfer point is still not
necessarily assured with this device.
[0006] In the winding of conical cross-wound bobbins disclosed in
German Patent Publication DE 24 54 916 C2, the yarn to be wound
onto the tube after a bobbin change or after a yarn break is first
held by an auxiliary yarn guide and then taken over after being
released by the yarn guide when the latter is moving in the
direction of travel toward the smaller bobbin diameter. The raising
and lowering of the auxiliary yarn guide takes place by means of a
relatively complicated actuating mechanism comprising several pivot
levers. The curved yoke-shaped auxiliary yarn guide and actuating
mechanism are designed in such a manner that they take up a
relatively large amount of space, in particular in the vertical
direction, and thus can cause problems on the front side of the
winding head, which significantly limits the possibilities of using
this system.
[0007] The methods and devices disclosed in German Patent
Publications DE 24 54 916 C2, DE 39 30 136 A1, DE 23 28 828 C2 and
DE-GM 74 37 800 share the significant disadvantage that the
traversing yarn guide takes over the yarn to be wound onto the
bobbin after it has been released from the auxiliary yarn guide
during its back-and-forth traversing motion. This manner of
operation entails the danger that the yarn will not be threaded as
intended into the yarn guide and will not be entrained in a
properly threaded state but rather may be grasped at a position of
the yarn guide that is not intended for receiving the yarn and
therefore may instead be pushed in front of the yarn guide over the
lateral edge of the cross-wound bobbin. This can cause yarn breaks
and even windings off the bobbin tube onto the supporting tube
plate of the winding station which windings can only be removed by
a time-consuming intervention by operating personnel. The problem
can not be solved even by relatively expensive monitoring and
control measures for the yarn guide and the yarn transfer device
like those described, e.g., in German Patent Publication DE 39 30
136 A1. Rather, the yarn and yarn guide are merely allowed to
arrive essentially at the same time at the transfer point or care
is taken that the yarn arrives at least slightly before the yarn
guide and in no case after the yarn guide. The danger of the
above-cited disadvantages due to an undesired shifting of the yarn
over the bobbin edge is present precisely upon an arrival of the
yarn in front of the yarn guide or when it is being held ready for
the yarn guide executing the traversing motion.
SUMMARY OF THE INVENTION
[0008] It is therefore an object of the present invention to
address these problems with an improvement of the known winding
methods and apparatus for transferring a yarn to a traversing yarn
guide.
[0009] The invention addresses this problem by an improved method
and apparatus for cross-winding of bobbins in a textile machine,
such as a spinning or winding machine, of the general type
comprising a plurality of winding heads each have a traversing yarn
guide movable back and forth relative to a bobbin for cross winding
of a yarn onto the bobbin and an auxiliary yarn guide movable
between an active position for holding the yarn in a raised
position out of the traversing yarn guide and an inactive resting
position wherein the yarn is positioned to be taken by the
traversing yarn guide to be wound onto the bobbin. According to the
present invention, after a yarn interruption, such as a yarn
breakage, the back and forth movement of the traversing yarn guide
is stopped and the interrupted yarn is reconnected, the reconnected
yarn is guided by the auxiliary yarn guide into an initial position
relative to the traversing path of the traversing yarn guide
wherein the auxiliary yarn guide is in the active position, and the
yarn is then lowered into the traversing yarn guide by moving the
auxiliary yarn guide from the active position into the inactive
resting position before the traversing yarn guide is restarted. In
the present apparatus, a control device is provided to control
actuation of this sequence of steps.
[0010] In this manner, a reliable threading of the yarn during its
takeover by the traversing yarn guide is achieved in a simple
manner and with relatively low expense by the present invention and
advantageously avoids an undesired pushing of the yarn in front of
the yarn guide beyond the bobbin edge.
[0011] The lowering and the take-up of the yarn preferably take
place after the drive of the cross-wound bobbin has started and a
brief time delay has elapsed after the beginning of the rotation of
the cross-wound bobbin. Alternatively, the lowering and the take-up
of the yarn can advantageously take place after a set number of
revolutions of a friction roller driving the cross-wound bobbin has
been achieved. The number of yarn windings wound on the bobbin
during the standstill of the traversing yarn guide can thereby be
kept extremely small. Localized bands of yarn windings that could
result in problems during the unwinding of the cross-wound bobbins
are avoided.
[0012] The auxiliary yarn guide can preferably pivot between the
active position and the rest position. This can reduce the space
requirement to a minimum in that the pivot shaft of the auxiliary
yarn guide can be located at a very small interval from the
traversing yarn guide whereas on the other hand, for example, any
type of simple crank system suffices to pivot the auxiliary yarn
guide. In particular, the auxiliary yarn guide can be attached to a
shaft that can pivot back and forth by means of a pneumatic
cylinder which is pivotably mounted to operate the shaft via a
pivot lever. The pivoting motion is initiated by the
afore-mentioned control device.
[0013] In an advantageous embodiment of the device in accordance
with the present invention, the mass to be moved can be kept very
small and the change from the active position into the rest
position of the auxiliary yarn guide can be carried out extremely
rapidly. As a consequence, the time required for aligning the yarn
in the start position and for the lowering and the take-up of the
yarn by the traversing yarn guide can be kept extremely short. In
such an extremely short time only a few windings, e.g., 1 to 3
windings, are deposited, so that no localized yarn bands are
produced by the winding of the yarn on an unchanging location on
the cross-wound bobbin that might cause problems during
unwinding.
[0014] It is advantageous if the auxiliary yarn guide can pivot in
the direction of the traversing yarn guide into its rest position.
In addition to an extremely small space requirement and practically
no hindrance at the winding head, only a very small pivot angle
must be overcome for such a pivoting motion. Moreover, the pivoting
motion is supported by the yarn tension. As a consequence, the time
delay before restarting of the traversing of the yarn can be held
advantageously short.
[0015] Preferably, in embodiments in machines and methods for the
winding of conical bobbins, the control device is designed such
that the traversing yarn guide initially moves after the yarn
interruption toward the bobbin end of the greater diameter, whereby
the yarn is maintained tautened thereby preventing the yarn from
being able to pull itself back out of the traversing yarn
guide.
[0016] The invention makes possible in a simple manner a reliable
take-up of the yarn by the traversing yarn guide after a yarn
interruption without disadvantageous winding bands having to occur
as in the prior devices described above.
[0017] The invention is described in greater detail in the
following specification with reference made to the accompanying
drawing figures.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 is a simplified schematic perspective view of a
winding head in accordance with the present invention.
[0019] FIG. 2 is a lateral side elevational view of the device of
FIG. 1.
[0020] FIG. 3 is a simplified schematic block diagram depicting a
portion of the device in accordance with the present invention.
DETAILED DESRCIPTION OF THE PREFERRED EMBODIMENT
[0021] Referring now to the accompanying drawings and initially to
FIGS. 1 and 2, a cross-wound bobbin 1 is mounted in customary
manner in a pivotable creel A which holds the bobbin 1 in surface
contact with a friction drive roller 2 for driving rotation of the
bobbin for winding thereon of yarn 3. Instead of friction drive
roller 2, cross-wound bobbin 1 can also be rotatably driven by an
individual motor drive (not shown) in which instance cross-wound
bobbin 1 is then supported in known manner on a support roller.
During the orderly winding of the yarn on the bobbin, the yarn 3 is
driven in a back-and-forth motion by traversing yarn guide 5 driven
in the direction of double arrow f. Traversing yarn guide 5 is
moved by motor 13 via toothed belt 12 driven in a back and forth
motion. Motor 13, and therewith the traversing motion and
positioning of traversing yarn guide 5, are monitored by a motion
pickup sensor 20 shown in FIG. 3 and by control device 14 connected
thereto.
[0022] In the view of FIGS. 1 and 2, auxiliary yarn guide 4 is in
an active position in which it has grasped yarn 3. As a result,
yarn 3 is raised out of traversing yarn guide 5. In this position,
yarn 3 is also raised in such a manner relative to its winding
position that it no longer touches yarn guide bracket 6, which acts
as a yarn support bracket, shown in the exemplary embodiment of
FIGS. 1 and 2. A pneumatic cylinder 7 is articulated to machine
frame B, only schematically indicated, and is loaded via lines 8
and 9 alternatively with compressed air from compressed air source
17 so as to serve to pivot auxiliary yarn guide 4 between rest
position 4' and the active position. The loading of line 8 or 9
with compressed air takes place with the aid of valve 18 and relay
19 that is actuated by control device 14. Pneumatic cylinder 7
drives pivot lever 10 that serves to pivot shaft 11 which is
permanently connected to auxiliary yarn guide 4. Auxiliary yarn
guide 4 comprises upper yarn guide edge 4.1 extending over the
traversing range of traversing yarn guide 5, which edge 4.1 has a
contour falling from both sides to the middle of the traversing
stroke of traversing yarn guide 5, that is, yarn guide edge 4.1 is
lowered toward the middle. Auxiliary yarn guide 4 is pivoted into
the active position upon a yarn interruption such as, e.g., a yarn
break.
[0023] Once the yarn connection between the yarn supply source and
cross-wound bobbin 1 has been reestablished after the yarn
interruption, friction drive roller 2 is started by motor 15. A
brief time period t also begins with the start of the rotary motion
of friction drive roller 2. The rotary motion of friction drive
roller 2 results in a tautening of yarn 3. Thereupon at the latest,
yarn 3 is guided by yarn guide edge 4.1 of auxiliary yarn guide 4
into its lowered middle position that is the initial position of
auxiliary yarn guide 4. In this initial position, yarn 3 is located
precisely above traversing yarn guide 5 located in a corresponding
middle position shown in FIG. 1 defined as a yarn transfer
position.
[0024] The lowering of yarn 3 takes place after yarn 3 has
tautened. The lowering can be brought about by control device 14
after time period 5 has elapsed, which is determined to be
sufficiently long to assure a tautening of the yarn, or,
alternatively, after a given number of revolutions of friction
drive roller 2. The number of revolutions as well as the angular
position of friction drive roller are detected by motion pickup
sensor 16 and evaluated by control device 14. A further alternative
possibility, not shown for reasons of simplicity, is to measure the
yarn tension as it increases, e.g., with a customary yarn tension
sensor, and to initiate the lowering of yarn 3 after the yarn
tension measured and evaluated by control device 14 has achieved a
predetermined value.
[0025] Auxiliary yarn guide 4, preferably designed as shown as a
yarn guide sheet or plate, is pivoted down into rest position 4',
shown in dotted lines in FIG. 1, by loading pneumatic cylinder 7
with compressed air via line 8, as a result of which yarn 3 is
lowered until it rests, on the one hand, on yarn guide bracket 6
and, on the other hand, has been placed in resting traversing yarn
guide 5 and thereby assumed position 3' shown in FIG. 1.
[0026] After the placing of yarn 3 into traversing yarn guide 5 the
traversing motion of traversing yarn guide 5 is started by control
device 14 and coordinated with the rotary motion of cross-wound
bobbin 1. The winding process can now be continued in the customary
manner.
[0027] The invention is not limited to the exemplary embodiment
shown. For example, auxiliary yarn guide 4 can be designed
alternatively as a wire bracket. Control device 14 can be connected
via lines (not designated in more detail) to other elements of the
work station, of the textile machine or to other control devices,
e.g., computers.
[0028] It will therefore be readily understood by those persons
skilled in the art that the present invention is susceptible of
broad utility and application. Many embodiments and adaptations of
the present invention other than those herein described, as well as
many variations, modifications and equivalent arrangements, will be
apparent from or reasonably suggested by the present invention and
the foregoing description thereof, without departing from the
substance or scope of the present invention. Accordingly, while the
present invention has been described herein in detail in relation
to its preferred embodiment, it is to be understood that this
disclosure is only illustrative and exemplary of the present
invention and is made merely for purposes of providing a full and
enabling disclosure of the invention. The foregoing disclosure is
not intended or to be construed to limit the present invention or
otherwise to exclude any such other embodiments, adaptations,
variations, modifications and equivalent arrangements, the present
invention being limited only by the claims appended hereto and the
equivalents thereof.
* * * * *