Winding – tensioning – or guiding – Helical or random winding of material – Including particular material to spool connection
Reexamination Certificate
1999-06-25
2001-06-05
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Helical or random winding of material
Including particular material to spool connection
C242S476400
Reexamination Certificate
active
06241177
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for winding a continuously advancing yarn onto a rotating bobbin tube to form a cross wound package, and more particularly to a method and apparatus for initially threading the advancing yarn onto the bobbin tube.
DE 42 41 290 discloses a takeup apparatus, wherein an advancing yarn is wound on a tube.
In this takeup apparatus, a drivable winding spindle mounts the tube. During the winding cycle, i.e., during the winding time of the package, a yarn traversing device reciprocates the yarn on the package surface within a traverse range. Such takeup apparatus are used, for example, in spin lines to wind a plurality of yarns respectively on one package at the same time. In this apparatus, a drivable winding spindle mounts a plurality of tubes one after the other.
To obtain in a subsequent process a continuous operation for further processing such packages, the trailing yarn end of one package is knotted to the leading yarn end of the next package. For this purpose, it is necessary to form during the winding of a package a so-called transfer tail wind outside of the traverse range. To this end, the known takeup apparatus comprises a transfer tail device, wherein a yarn guide guides the yarn outside the traverse range before the actual winding cycle. To wind a transfer tail, the yarn guide is moved from a threading position to a transfer range. In the transfer range, the yarn is transferred to the traversing device. The actual winding cycle can then start.
In the known takeup apparatus, the problem arises that, depending on winding parameters, the unwound yarn length of the transfer tail wind has extremely different lengths. A further problem lies in that the length of the unwound yarn of the transfer tail does not correspond to the length of the yarn required for knotting it, but turns out to be substantially greater. This again leads to an unnecessary waste of yarn.
It is therefore an object of the invention to further develop a method and an apparatus for winding a yarn such that the wound transfer tail wind has substantially exactly the yarn length as is needed for further processing the package.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by a method and apparatus where the speed of the movement of the yarn guide from the threading position to the traverse range is controlled as a function of the winding speed. As a result, a predetermined number of winds may be deposited on the bobbin tube within the transfer tail wind. At a winding speed of, for example, 1,000 m/min., the yarn guide is guided at a relatively low speed. To wind the number of winds at a takeup speed of, for example, 6,000 m/min, it is necessary to guide the yarn guide at six times the speed under identical geometric conditions.
As indicated above, the method of the present invention makes it also possible to deposit a predetermined number of winds within the transfer tail wind. The special advantage lies in that it is possible to determine the length of the yarn within the transfer tail wind. This allows to minimize waste of yarn. Furthermore, it is possible to adjust any desired length of the yarn that varies depending on the yarn type or package type.
With the present invention, a constant number of winds may be deposited irrespective of the length of the transfer tail wind, i.e., the distance between the threading position and the traverse range. This provides the advantage that length tolerances of the tube have no influence on forming the transfer tail. In particular in the case of takeup apparatus, wherein a winding spindle mounts a plurality of tubes one after the other, an addition of such length tolerances occurs. This results in that a differently long transfer tail wind forms on each tube being wound. Such tolerances can be compensated by the method of the present invention, so that a substantially identical transfer tail wind is produced on each of the tubes.
A particularly advantageous variant of the method of the invention provides that the speed of the yarn guide is controlled as a function of the position of a traversing yarn guide of the yarn traversing device. Thus, it is possible to adjust the transfer of the yarn from the yarn guide to the traversing yarn guide such that no parallel winds are produced in the transfer range. The transition from the transfer tail wind to the actual package wind is continuous.
A further variant of the method accomplishes that a constant length of the transfer tail wind is produced irrespective of the length of the tube. This method permits producing very uniform transfer tail winds with winds symmetrically deposited on the tube.
The apparatus of the present invention comprises a speed-variable drive of the yarn guide, which can be controlled by a controller. The controller connects to a rotational speed sensor that measures the rotational speed of the winding spindle or directly of the tube. By means of a computing unit, the controller is in a position to generate from rotational speed signals and the number of winds of the transfer tail wind, which are stored in the controller, a control signal that leads to a certain driving speed of the yarn guide.
It is also possible to extend the apparatus of the present invention to a plurality of side-by-side winding positions. In this instance, it is preferred to line up the tubes on a drivable winding spindle one after the other. The yarn guides of each winding position can be operated by means of a drive that is variable in its speed, or each by individual drives.
To transfer the yarn without delay into the yarn traversing device during a yarn transfer, the embodiment of the apparatus which includes a position sensor for detecting the position of the traversing yarn guide of the traversing device, is especially advantageous.
A position sensor can also be used to detect the location of one of the ends of the bobbin tube. This permits the production of transfer tail winds that have always the same distance from the tube end.
An electric stepping motor is especially suited for driving the yarn guide, since the control of the position as well as the speed are simple to realize.
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Schroter Michael
Spahlinger Jorg
Alston & Bird LLP
Barmag AG
Pham Minh-Chau
Walsh Donald P.
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