Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Patent
1996-03-18
1998-03-17
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
2425325, 2425338, 242538, 2425263, 533812, 53492, B65H 1810, B65B 6900
Patent
active
057277478
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP94/03185 filed 23 Sep. 1994 and based, in turn, upon German National Application P 44 00 661.6 of 12 Jan. 1994 and G 93 14 339.7 of 23 Sep. 1993 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a method of removing a foil wrapping drawn over a stack of goods. The invention also relates to a device for carrying out the method.
1. Background of the Invention
In practice, stacks of goods, especially palletted goods, are secured with shrink foil or stretch foil, transported and delivered to the user. The user has to remove the foil in order to unpack the stack of goods. Usually this has been is done by hand.
2. Object of the Invention
It is the object of the invention to mechanize the removal of the foil.
SUMMARY OF THE INVENTION
This object is achieved with a method for the removal of a wrapping drawn over a stack of goods by vertically cutting the foil wrapping on one side of the stack of goods, by seizing one edge of the cut and fastening it to the winding spindle and guiding, the winding spindle around the stack of goods, thereby wrapping the foil around the winding spindle rotating about its longitudinal axis. In order to avoid damage to the stack of goods or to the goods stacked therein, the foil wrapping can be lifted off the stack of goods, area by area, and then cut open. The foil wrapped around the winding spindle is removed from the winding spindle and can then be disposed of, or first compacted and then disposed of.
It is suitable to guide the winding spindle around the stack of goods by keeping a constant distance therefrom, because then the forces acting on the foil remain basically constant and the tearing lines in the foil continue in the peripheral direction of the stack of goods. Particularly the winding spindle rotating about its longitudinal axis can pull itself around the stack of goods without additional actuation at the foil.
When the tearing of the foil is desired in a certain area, e.g. so that the upper part of the stack of goods still remains covered by a partial foil wrapping, the foil wrapping is heated below the upper part of the stack of goods. The same applies when the desired tearing line is in the area of a support (pallet) of the stack of goods, for which purpose the foil wrapping is heated in the area of the support (pallet) of the stack of goods.
The stack of goods can be lifted, in order to eliminate possible shrinkage of the foil wrapping at the bottom.
A device for carrying out the method is equipped with a frame, a supporting arm on the frame and which is pivotable about a vertical axis and can be driven around the axis, for a winding spindle suspended therefrom. Such devices are known for wrapping a stack of goods. In contrast thereto the device of the invention is characterized in that on the supporting arm a guide slide carriage movable in its longitudinal direction is arranged, that the winding spindle and a guide mast extending parallel thereto are suspended on the guide slide carriage, and that a vertically displaceable lifting slide carriage with a separating device is guided on the guide mast. In particular the lifting slide carriage can have a suction device connectable to a suction source, by means of which the foil can be lifted off the stack of goods, area by area. The separating device can be a blade movable along the lifting slide carriage by means of a drive, particularly a lifting cylinder, or a heating wire extending parallel to the winding spindle. Further on the guide mast hot air nozzles can be provided, which are directed so that they heat the portion of the foil in front of the winding spindle in the direction of rotation, thereby defining the mentioned tearing lines. For the transfer of the cutoff edge to the winding spindle, the winding spindle can be associated, at least in certain areas, with a gripping device, which seizes the free cutoff edge and clamps it to the winding spindle.
Underneath the frame it is possible t
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Patent Abstracts of Japan, vol. 1, No. 2 (M-3) 51115190, Sep. 1976.
Hannen Reiner
Michels Frank
Vermeulen Norbert
Dubno Herbert
Jillions John M.
Kateshov Yuri
MSK-Verpackungs-Systeme GmbH
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