Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Patent
1994-01-21
1995-12-26
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
242542, B65H 3504
Patent
active
054780268
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP 93/00965 filed 21 Apr. 1993 and based, in turn, on German national application P 42 19 541.1 of 15 Jun. 1992 under the International Convention.
FIELD OF THE INVENTION
Our present invention relates to a winding machine with support cylinders for winding webs of material, particularly paper or cardboard webs on cores. Such winding machines serve for the manufacture of wound rolls from webs of material subdivided through longitudinal sectioning. During winding the winding rolls are supported in axial, alignment on the two support cylinders.
BACKGROUND OF THE INVENTION
In order to keep the standstill times of a winding machine as short as possible during the exchange of the winding rolls, it is known from DE-OS 2920707 to cut the web of material in the cylinder bed formed by the support cylinders by means of a sectioning device having a tear-off blade, which can be raised through the gap between the cylinders, at the moment when the fully wound roll is pushed off. The new web end created by the cut is kept by underpressure (suction) on the wrapped support cylinder, until a new set of cores is introduced onto the cylinder bed, i.e. the gap formed between the support cylinders.
From WO 92/03366 a winding machine with support cylinders is known, wherein superatmospheric pressure is created with compressed air in the space defined by the support cylinders and the winding rolls. This superatmospheric pressure reduces the bearing load and thereby also the line load (=bearing load per width of a winding roller) at the two contact lines of each wound roll on the support cylinders, which has a significant influence on the winding firmness of the winding roll. Because of this load reduction, it is possible to wind winding rolls with very large diameters (more than 800 mm) with very good winding quality.
According to one embodiment, in the area of the lower wedge between the support cylinders an air box is provided. The air box extends over the entire work width (=axial length of the support cylinders) and is provided with a supply line for compressed air. The air box is swingable from an upper work position, wherein its lateral surfaces are pressed sealingly against the support cylinders to a position underneath one support cylinder. The lowering makes room for a separate cutting knife which can be raised from below through the gap between the support cylinders and whose tear-off blade tears off the web when the fully wound roller is pushed out.
OBJECT OF THE INVENTION
It is the object of the invention to provide an improved winding machine with support cylinders, so that it has a compact construction and is possible to perform the roll replacement in a shorter time.
SUMMARY OF THE INVENTION
This object is achieved in a winding machine with support cylinders for winding a web of material, particularly a paper or cardboard web, onto cores with two support cylinders on which the winding rolls are supported during winding, whereby the web of material partially looped around a support cylinder is guided from underneath through the gap between the support cylinders. A cutting knife for sectioning the web when the winding rolls are replaced has a tear-off blade which can be lifted through the gap between the support cylinders until it reaches the cylinder bed. An air box extends over the working width and has a compressed air supply line and is arranged in the lower wedge between the support cylinder to seal the gap between the support cylinders, being provided with an air exit slot extending over the work width.
According to the invention the tear-off blade of the cutting knife is fastened to a support which can move up and down in the air box and can be raised through the air exit slot until it reaches its cutting position in the cylinder bed and can be completely lowered into the air box.
The arrangement of the cutting knife support with the tear-off blade in the air box requires less space than a separate cutting knife. Fu
REFERENCES:
patent: 3497151 (1970-02-01), Voss et al.
patent: 3918654 (1975-11-01), Okubo et al.
patent: 4183474 (1980-01-01), Schonmeier
patent: 4368855 (1983-01-01), Schonmeier et al.
patent: 4370193 (1983-01-01), Knauthe
patent: 4635867 (1987-01-01), Kytonen
patent: 5067663 (1991-11-01), Dropczynski
patent: 5310130 (1994-05-01), Wieland et al.
Dropczynski Hartmut
Hoffmann Peter
Schonen Reinhard
Schonmeier Herbert
Dubno Herbert
Jagenberg Aktiengesellschaft
Jillions John M.
Rivera William A.
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