Textiles: manufacturing – Bobbin stripping
Reexamination Certificate
2000-09-28
2001-08-28
Vanatta, Amy B. (Department: 3765)
Textiles: manufacturing
Bobbin stripping
C028S295000, C028S297000, C057S300000
Reexamination Certificate
active
06279213
ABSTRACT:
CROSS-REFERENCES TO RELATED APPLICATIONS
This application claims the benefit of German patent application 19947402.8 filed Oct. 1, 1999, herein incorporated by reference.
FIELD OF THE INVENTION
The present invention relates to a device for holding and centering textile yarn tubes supported in a vertical orientation on transport disks for removal therefrom of winding remnants at a tube cleaning station, and relates more particularly to such a device having a centering arbor whose height can be changed by means of a drive mechanism, and an arresting means which fixes the centering arbor at its operating height.
BACKGROUND OF THE INVENTION
A device of the above described type is described, for example, in German Patent Publication DE 41 31 667 A1 in connection with a tube cleaning mechanism of a bobbin winding machine for producing cheese-type yarn packages.
Malfunctions can occur at the work stations of such cheese-producing textile machines, for example automatic cheese winders, during the process of rewinding spinning cops into large-volume cheeses, which malfunctions prevent the correct complete unwinding of the spinning cop tubes placed thereat. Such tubes with yarn remnants which are sufficiently small as to be unworthy of further unwinding must be completely cleaned, i.e. their yarn remnant completely removed, before they can be returned into the spinning/winding process.
In the course of this cleaning process, a tool is placed against the tube and is displaced parallel with respect to the tube axis to remove the remnant yarn, whereby it is necessary to center the tube exactly to avoid the danger that the tube, which stands on a disk-shaped transport body, a so-called transport disk or caddy, could be damaged.
With the device known from German Patent Publication DE 41 31 667 A1, the yarn remnants are loosened by means of a stripper which can be displaced along the tube, and the loosened remnants are subsequently suctioned off. As already indicated above, the tube body of the spinning cops having a yarn remnant stand upright on the arbors of disk-shaped transport bodies, which are conveyed by means of transport belts into the area of the tube cleaning mechanism of the bobbin winding machine, and are subsequently transported away therefrom to other operational areas of the machine over appropriate transport tracks.
During the process of removing the yarn remnants, the tube of the cop is centered, so that the cleaning tool can optimally operate by being exactly placed against the tube, and so that the tube is not lifted off the support body in the course of stripping off the yarn remnant.
For this purpose, the device in accordance with German Patent Publication DE 41 31 667 A1 has a centering arbor, whose operating height is exactly matched to the length of the cop tubes of the respective batch of yarn. When a new batch of yarn is to be wound, and the height of the tubes utilized for the new batch is changed, the centering device must be manually reset.
Thus, processing of tubes of different lengths is not possible with the known tube cleaning mechanism. In case the bobbin winding machine is occupied by several batches, wherein two or more groups of cops having tubes of different length rotate simultaneously through the transport system of the textile machine, it is necessary to employ two or more tube cleaning mechanisms, which are set to different heights.
A device for holding down and centering tubes is also known, for example, from German Patent Publication DE 196 50 735 A1, which has a rotatably seated holder with a plurality of centering arbors, which differ in diameter, as well as in length. Here, the different centering arbors can be used alternatingly.
However, it is disadvantageous in connection with this known device that the centering process can only take place automatically if the length and the diameter of the respective tubes to be cleaned have been previously determined in a relatively elaborate manner by sensor means, which as a rule are comparatively expensive. This known device has not found acceptance in actual operations within the industry.
OBJECT AND SUMMARY OF THE INVENTION
In view of the above mentioned prior art, it is therefore an object of the present invention to provide a device of the afore-described type for holding down and centering textile yarn tubes while supported on transport disks for removal therefrom of winding remnants at a tube cleaning station which device assures the secure fixation in place of the tubes, in particular during tube cleaning, at any time and independent to the greatest extent of the format, i.e., the type and size, of the tube.
Basically, this object of the present invention is attained by providing an improved device for holding and centering a yarn tube while supported in an upright orientation on a transport disk disposed at a processing station, such as a tube cleaning station for removing unused yarn remnants from yarn tubes. Briefly, summarized, the device of the present invention comprises a centering arbor for engagement with the yarn tube, a drive mechanism for moving the centering arbor upwardly and downwardly relative to the processing station for moving the centering arbor into engagement with the yarn tube, and an arresting means for fixing the centering arbor at an operating height. In accordance with the present invention, the arresting means comprises a circuit arrangement coupled with the centering arbor and with the drive mechanism and operable for automatically deactuating movement of the drive mechanism at an operating height of the centering arbor matched to the length of the yarn tube, and means for locking the centering arbor at the operating height.
The present invention has the particular advantage that the centering arbor of the hold-down and centering device is always set automatically to the height of the tubes provided. Thus, when using the device in accordance with the invention, the manual setting and adjustment work, which as a rule had been required heretofore in case of batch changes, is avoided. The device of the present invention furthermore offers the option of operating an automatic cheese winder when working several yarn batches, wherein tubes of different lengths of the different yarn batches can be processed in a common tube cleaning mechanism and can be securely fixed in place in the process.
In such case, the circuit arrangement, which automatically matches the operating height of the centering arbor to the respective tube present thereat, is coupled with the centering arbor and preferably is at least partially integrated into the centering arbor. Such a circuit arrangement integrated into the centering arbor is insensitive to the difficult atmospheric conditions often found in spinning factories, and is almost maintenance-free.
In an advantageous manner, the drive mechanism comprises a bridge member connected to the centering arbor and the centering arbor comprises an at least partially hollow centering arbor sleeve, a centering arbor core fixed on the bridge member, and an actuating pin displaceably seated in the centering arbor core. Preferably, the circuit arrangement comprises a Hall sensor connected to a control device for actuating and deactuating the drive mechanism and a permanent magnet fixed on the actuating pin for dampening the Hall sensor at the operating height of the centering arbor. The circuit arrangement of such an embodiment has been proven to be extremely insensitive to atmospheric conditions and very dependable. Furthermore, the circuit arrangement is relatively low cost, particularly because of using a Hall sensor.
In a preferred embodiment, the centering arbor sleeve is seated displaceably in relation to the centering arbor core, and a spring element is interposed therebetween. The centering arbor sleeve is connected with the centering arbor core via a tensioning pin which extends through an elongated bore hole in the centering arbor core. This embodiment advantageously prevents the centering arbor from being placed on the tube tip at too high a con
Kohlen Helmut
Mund Manfred
Rijpstra Jos
Schmitz Bernhard
Kennedy Covington Lobdell & Hickman LLP
Vanatta Amy B.
W. Schlafhorst AG & Co.
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