Sheet feeding or delivering – Feeding – Separator and conveyor
Patent
1992-09-17
1994-10-18
Olszewski, Robert P.
Sheet feeding or delivering
Feeding
Separator and conveyor
271 183, 271104, B65H 500, B65H 322
Patent
active
053561260
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a method for separating piled textile cuts, comprising the precharacterizing features of the patent claim 1 and an apparatus for performing this method.
Such a method and a corresponding apparatus have been disclosed in DE-A-37 19 393 where between the gripping elements air nozzles are arranged for releasing upon gripping of a cut further fabric parts adhering thereto by a corresponding air flow or air pulse. Thereby, the uppermost cut on a cut pile shall be separated by separating from the other adhering fabric parts which cling by fiber hooks to the first gripped cut.
This separating problem constitutes a bottle neck, in particular with the automatization in the clothing industry, since a reliable separating of single cuts from a fabric pile has not been reliably solved. The fabrics are simultaneously cut in a pile in the cutting department according to a predetermined cutting pattern in a plurality of fabric layers such that the pile must be resolved again into its individual cuts for the subsequent processing steps, as sewing, etc. In addition to the fiber hookings there are, in particular, hookings at the cutting edges, caused during cutting, such that between the individual cuts sometimes there are very high, but varying adhesive forces.
According to the DE-A-37 19 393 the excessive cuts shall be blown apart from the current uppermost fabric cut to be gripped. In this connection, the gripping element is preferably formed as a so-called freezing gripper, where the adhering of the uppermost cut is achieved by partially icing the cut. Releasing excessive cuts shall be achieved by air nozzles whose outlet openings are arranged approximately in the plane of the gripping elements. In this connection it may happen, that during activating of the blowing nozzles the upper cut is blown away from the gripping elements since an air cushion is formed between the area-type gripping elements and the gripped fabric layers, which cushion separates the gripped cut(s) partially or completely from the gripper. Even if instead of the freezing gripper adhering grippers or needle grippers having higher gripping forces would be used, this disadvantageous effect is still there, such that no safe separation of the uppermost cut from the residual pile is possible.
In particular when using so-called downholders as a separation assisting means for maintaining this residual pile in order during drawing-up of the uppermost cut from the residual pile, there was the further disadvantage that the uppermost cut loaded by the air flow was pressed down below the engagement level of the downholder such that this cut was gripped by the downholder as well. Therefore, stripping off the uppermost cut was impossible. As a whole, with this apparatus no continuous reproducible separating was achieved. These disadvantages are valid as well for the further known separating apparatuses according to DE-A-20 21 233 and DE-A-31 47 818, since there a downholder was placed onto the cut pile with even an increase of the fiber hookings. The same is true for the separating apparatuses according to U.S. Pat. No. 4,283,047 and U.S. Pat. No. 3,275,317 where during the separating process the central region of the uppermost cut is pressed by a needle or a plate onto the pile and, therefore, the negative fiber hookings are even increased.
Accordingly, it is the object of the invention to provide a method and an apparatus for the separating of piled textile cuts, permitting a reliable separation of further adhering fabric parts from the uppermost cut and, therefore, a safe isolation thereof.
This object is solved by a method comprising the features of patent claim 1, and by an apparatus comprising the features of patent claim 1.
The direct placing of the loading device onto the surface of the gripped cut in a state lifted from the pile results in a sagging downward and, therefore, a warping of the cuts sufficient to produce shearing forces between the uppermost cut to be removed and the excessive cuts, and, therefore, in for
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Bayer Fritz
Schulz Georg
Institu fur Textil - und Verfahrenstechnik der Deutschen Institu
Milef Boris
Olszewski Robert P.
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