Winding – tensioning – or guiding – Unwinding – With supply coil replenishment
Patent
1998-11-05
2000-03-28
Jillions, John M.
Winding, tensioning, or guiding
Unwinding
With supply coil replenishment
2423991, 2425961, B65H 1606, B65H 1912
Patent
active
060420472
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an unwinding device for wound rolls, especially for paper rolls or cardboard rolls.
BACKGROUND OF THE INVENTION
In the paper processing or cardboard processing industry, such unwinding devices are used to withdraw one or more paper webs or cardboard webs from one or more wound rolls and to feed them to a subsequent processing machine, e.g. a transverse cutting machine. The wound rolls are held during the unwinding without a shaft between two guide heads clamping the wound roll between them and journaled on respective carrying arms. For loading the device with a new wound roll, for removing the roll residue and for adjustment to different rolls widths, the carrying arms with the guide heads are mounted so as to be movable toward and away from one another. In addition, the guide heads can be raised to lift a new wound roll from a receiving position on the floor to an unwinding position.
From German Utility Model G 85 11 986 an unwinding device of the aforedescribed type is known which has a transverse traverse on which the support beams are mounted so as to be transversely shiftable. The support beams are variable as to their lengths and carry the guide heads at their ends, the guide heads being insertable in the sleeve of a wound roll. The support beams are, in addition, swingable upwardly in order to provide a free space through which the device can be charged with a new wound roll from the side.
With the known unwinding devices it is necessary to position a new wound roll in the receiving position with relatively high accuracy so that the guide heads can be inserted into a sleeve in a problem-free manner. An excessive deviation from the setpoint position of the wound roll can lead to jamming of the guide heads during insertion. As a consequence, extensive aligning devices, (e.g. special lifting devices) are required to position the wound rolls with the requisite precision in their receiving positions in case the roll reception is to be effected automatically.
OBJECT OF THE INVENTION
The invention presents the object of so improving a device of the type described that the wound rolls can be picked up without exact positioning by means of expensive alignment devices.
SUMMARY OF THE INVENTION
This object is achieved in an unwinding for wound rolls which has a frame with longitudinal and transverse girders and an unwinding beam suspended in the frame so that it can swing in a pendulum fashion freely to allow guide heads at the ends of two support arms carried by the unwinding beam to fit into corresponding ends of a wound roll. According to the invention, the support arms with the guide heads are suspended movably to freely swing in the web travel direction (i.e. in the longitudinal direction of the machine) in a pendulum-like manner. Upon movement into the sleeve, the guide heads position themselves automatically as long as the tips of the guide heads engage in the sleeve. With large deviations from the sleeve position, the guide heads can be aligned to the sleeve flush by a service person.
A further advantage is that it is possible to laterally swing the support arms upwardly without excessive structural expense to afford a place for charging with an unwound roll. The lifting drive can serve simultaneously as the swing drive to enable the desired swinging movement during the lifting movement of the support arms.
According to a feature of the invention, the unwinding beam has, on each machine side a cable, belt or chain connected to the common lifting drive. The support arms can be movable toward and away from each other on the unwinding beam by an adjustment drive affixed thereto. The support arms can be additionally mounted so as to be transversely shiftable limitedly equidistantly by means of a positioning drive.
According to another feature of the invention at opposite ends of the unwinding beam rollers, on which loops of the tension means can depend, the unwinding beam and the parts attached thereto being swingable about an axis of the ro
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patent: 5060878 (1991-10-01), Hutzenlaub et al.
patent: 5607120 (1997-03-01), Folsom
patent: 5651511 (1997-07-01), Crowley et al.
patent: 5697575 (1997-12-01), Moore et al.
Dubno Herbert
Jagenberg Papiertechnik GmbH
Jillions John M.
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