Winding – tensioning – or guiding – Helical or random winding of material – Including wound package or empty spool handling
Reexamination Certificate
1998-11-13
2001-02-20
Mansen, Michael R. (Department: 3653)
Winding, tensioning, or guiding
Helical or random winding of material
Including wound package or empty spool handling
C242S474700, C242S476400, C242S476500
Reexamination Certificate
active
06189826
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an apparatus and method for guiding and cutting a continuously advancing yarn during a package doff in a yarn winding apparatus.
The apparatus and method are known from EP 0 311 827. In textile machines, for example, a crimped yarn is continuously wound to a package. After the package is fully wound, same is doffed. To this end, it is necessary to first cut the yarn, so that the full package with the loose yarn end can be replaced with a new empty tube. During the doff, the yarn end of the continuously advancing yarn is received and removed by a pneumatic suction device. After the package is doffed, the yarn is caught by means of a catching device and wound on the new tube.
In the apparatus disclosed in EP 0 311 827 and by the known method, the yarn is guided, after the package is fully wound, by means of a movable yarn guide outside the winding range to a suction device laterally arranged next to the winding range. After the package is doffed and the new tube is ready for catching the yarn, the yarn guide swings back to the winding range. To transfer or respectively catch the yarn, same is deflected by means of a transfer device between the suction device and the yarn guide, and presented for catching to the catching device.
The known apparatus and the known method have the disadvantage that at the end of the winding cycle, the loose yarn end on the fully wound package lies there against in an undefined manner, which complicates locating the loose yarn end in particular during further processing.
Furthermore, the deflection of the yarn by the transfer device for purposes of catching the yarn leads to considerable loopings which result, when compared to the winding tension, in major tension fluctuations of the yarn. Such fluctuations in the tension may lead to a formation of laps on preceding feed elements.
It is accordingly an object of the present invention to provide an apparatus and a method of the initially described type which ensure that the yarn is guided as gently as possible while doffing the package, catching the yarn, and winding initial layers thereof.
A further object of the invention is to ensure that after cutting the yarn, the loose yarn end lies against a tie-off wind on the full package.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a yarn winding apparatus which comprises a bobbin tube mounting device for rotatably supporting a bobbin tube, and with the mounting device being movable between a winding position wherein the bobbin tube is in contact with a drive roll so as to rotate the tube, and a withdrawn position wherein the bobbin tube is separated from the drive roll. A yarn traversing device is provided for traversing the advancing yarn along a winding range on a bobbin tube which supported by the mounting device at the winding position to form a wound package. Also, a yarn guide is mounted upstream of the bobbin tube located at the winding position so as to be movable by a drive along a direction parallel to the axis of the bobbin tube, and a cutting and suction device is mounted downstream of the bobbin tube. Further, a transfer device is mounted for movement to an operative position wherein, when the bobbin tube mounting device moves a full package to its withdrawn position, the transfer device deflects the advancing yarn into contact with the cutting and suction device.
The cutting and suction device is located in a transfer plane which is within the winding range, and the yarn guide is movable into the transfer plane. Also, the transfer device includes a gripping arm having a free end which is within the transfer plane when the transfer device is moved to its operative position.
The yarn guide and the suction device are arranged within the winding range. In this connection, the winding range is the range on the tube which is covered by the traversed yarn. This allows the yarn to be cut with relatively little deflection and to recatch same thereafter. Thus, no significant yarn tensions occur during the doffing phase. The suction device is arranged preferably stationarily. In the case of a suction device constructed for movement substantially parallel to the package there is the possibility of placing the loose yarn end with the tie-off wind in any desired position within the winding range. Furthermore, the additional mobility of the suction device imparts a high flexibility to the configuration of the catching device.
In a particularly advantageous embodiment of the apparatus, the yarn guide and the suction device may be arranged in a transfer plane, so that the loose yarn end on the full package can be reliably deposited on the tie-off wind. Furthermore, a simple swing movement of the transfer device permits the yarn to be guided into the cutter of the suction device. In this process, only one deflection is needed in the transfer plane. The gripping arm of the transfer device engages the yarn as it advances between the package that is already raised and the yarn guide. This arrangement has furthermore the advantage that when raising the package from the drive roll, the transfer device causes the yarn to remain safely guided in the yarn guide. Preferably, the transfer plane is formed as a normal plane of the package and includes the tie-off wind of the package.
The inlet end of the suction device and the cutter may be arranged one after the other in the transfer plane. This ensures that the yarn is already engaged by the pneumatic suction inlet opening before entering into the cutter. Thus, after being separated in the cutter, the end of the advancing yarn is safely received and removed. To this end, the cutter has preferably a cutting blade which cooperates with the gripping arm of the transfer device such that the yarn is cut clean and safely by the cutting blade.
To guide the yarn safely into the opening of the suction inlet, it is advantageous to make same slotted in the direction of the advancing yarn and arranged in alignment with a cutting blade of the cutter.
For catching the yarn, the yarn guide and the suction device are arranged relative to each other such that the catching device extends in the path of the yarn between the yarn guide and the suction device. This arrangement facilitates catching of the yarn in the catching device without additional auxiliary means alone by the movement of the yarn guide. To this end, the yarn is deflected only in the longitudinal direction parallel to the tube. By an additional, equidirectional movement of the suction device it is also made possible to minimize the deflection of the yarn.
In the winding apparatus of the present invention, wherein the tube is mounted between two clamping plates arranged on a package holder, and the catching device is formed on one of the clamping plates, it is possible to catch the yarn in a simple manner. To this end, the yarn is obliquely guided over the front edge of the clamping plate, so that the yarn automatically drops into a catching slot arranged in the front edge of the clamping plate. Furthermore, the arrangement of the yarn guide and the catching device is advantageous in such a manner that the yarn and the clamping plate perform an equidirectional movement. This prevents the yarn from sagging and, thus, from undergoing an excessive fluctuation in tension.
In the case of the previously described operations concerning doffing a package, catching the yarn, and winding first layers thereof, it is presumed that at the beginning of the package doff, the yarn is guided on a traversing yarn guide by means of an auxiliary device, and that it is subsequently received by the yarn guide. In this instance, it is preferred to provide the yarn guide with a drive which moves the yarn guide in the longitudinal direction parallel to the tube, and the movement of the yarn guide is performed in each direction at a variable speed. In this case, the drive may, for example, be a linear drive.
In a particularly advantageous further development of the i
Alston & Bird LLP
Barmag AG
Mansen Michael R.
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